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Artículos de revistas sobre el tema "Leaching"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 25 de julio de 2025

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1

Chang, Siu Hua, and Siti Fatimah Abdul Halim. "Recovery of Precious Metals from Discarded Mobile Phones by Thiourea Leaching." Materials Science Forum 962 (July 2019): 112–16. http://dx.doi.org/10.4028/www.scientific.net/msf.962.112.

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The objective of this work was to recover gold and silver from the printed circuit board (PCB) of discarded mobile phones by thiourea leaching. Effects of thiourea concentration, leaching temperature, leaching time, and ferric ion (Fe3+) concentration on the recovery of gold and silver were investigated. The PCB was pretreated physically to reduce the thiourea consumption and enhance the leaching process. It was found that the percentage of gold leaching was higher than that of silver at different conditions studied. The highest percentages of gold (96%) and silver (90%) leachings were achieve
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2

B., Manoj, Kunjomana A. G., and Mansoor Ahmad. "Effect of Leaching High Ash Coal by Hydrofluoric Acid and EDTA on Removal of Mineral Matter and Sulphur." Mapana - Journal of Sciences 8, no. 2 (2009): 29–37. http://dx.doi.org/10.12723/mjs.15.4.

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Demineralization of coal was carried out using EDTA and HF. The residual coal from each treatment was characterized together with virgin coal using Scanning Electron Microscopy and energy dispersive X-ray analysis (EDAX). An elemental analyzer was adopted to analyze CHNS on virgin and residual coal sample. The current research compares the leaching efficiency of a mild leachant and a strong leachant. The final analysis showed that the coal under study was subbituminous coal and leaching could improve the amount of carbonaceous material. It was observed that with HF leaching aluminates silicate
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3

Kosanlavit, Waraporn, and Napat Noinumsai. "Effects of Nanoscale Zero-Valent Iron on Soil-Leaching of Trinitrotoluene Contaminated Soil in Acid Rain Conditions." Key Engineering Materials 907 (January 21, 2022): 66–73. http://dx.doi.org/10.4028/www.scientific.net/kem.907.66.

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The study of effects of nanoscale zero-valent iron (nZVI) on soil-leaching of trinitrotoluene (TNT) contaminated soil in the acid rain conditions is aim to the determination of the effect of nZVI which used as treatment material on soil leaching of TNT contaminated soil in raining condition. Research methodology, soil leaching batch reactor was designed for TNT remediation in soil with nZVI. The reactor was divided into three compartments for the different series of the experiment. Three compartments of the experiments were used for 1) TNT-contaminated soil column (without leaching), 2) TNT-co
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4

Park, Yujin, Yuik Eom, Kyoungkeun Yoo, and Manis Kumar Jha. "Leaching of Copper from Waste-Printed Circuit Boards (PCBs) in Sulfate Medium Using Cupric Ion and Oxygen." Metals 11, no. 9 (2021): 1369. http://dx.doi.org/10.3390/met11091369.

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In the present paper, the leaching of copper from printed circuit boards (PCBs) using sulfuric acid with Cu2+ and O2 is proposed. The effects of various process parameters such as agitation speed, temperature, the type and the flow rate of gas, initial Cu2+ concentration, and pulp density were investigated to examine the dissolution behavior of Cu from PCBs in 1 mol/L sulfuric acid. The kinetic studies were performed using the obtained leaching data. The leaching rate of Cu from PCBs was found to be higher on addition of Cu2+ and O2 to the leachant in comparison with the addition of O2 or both
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5

Sahu, Sibananda, Subhankar Pati, and Niharbala Devi. "A Detailed Kinetic Analysis of the Environmentally Friendly Leaching of Spent Lithium-Ion Batteries Using Monocarboxylic Acid." Metals 13, no. 5 (2023): 947. http://dx.doi.org/10.3390/met13050947.

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It is essential to develop a leaching procedure that uses minimal acid consumption, is economical, recovers large amounts of metal, and has a minimal negative impact on the environment. In this paper, a viable hydrometallurgical method using acetic acid as a leachant is suggested for recovering critical metals from waste LCO-type batteries. Several leaching parameters were examined in order to optimize the leaching conditions. With 1.2 mol/L acetic acid, 7% H2O2, 90 °C, an S/L ratio of 10 g/L, and a 60 min leaching period, the maximum leaching efficiencies of Li (99.6%) and Co (95.6%) were att
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6

Zha, Fusheng, Congmin Liu, Bo Kang, et al. "Effect of Carbonation on the Leachability of Solidified/Stabilized Lead-Contaminated Expansive Soil." Advances in Civil Engineering 2021 (February 11, 2021): 1–13. http://dx.doi.org/10.1155/2021/8880818.

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Lime, fly ash, and alkaline residue are used widely as effective binders to solidify/stabilize heavy metal-contaminated expansive soil. Carbonation, however, may influence the effectiveness of solidification/stabilization (S/S) by decomposing hydration products and decreasing pH, which would seriously damage the long-term durability of stabilized soils. This study focused on the variation of leaching characteristics of solidified/stabilized lead-contaminated expansive soils before and after accelerated carbonation under the leachant of pH 3 and 5 by the semidynamic leaching test. After semidyn
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7

Mohd Rozali, Mohd Fasyraf Hafizi, Nurulfazielah Nasir, Suhaina Ismail, and Norazharuddin Shah Abdullah. "Preliminary Studies on Acid Leaching of Finely-Ground Malaysian Low Grade Manganese Ore (LGMO)." Materials Science Forum 840 (January 2016): 364–68. http://dx.doi.org/10.4028/www.scientific.net/msf.840.364.

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Ore samples, believed to be low grade manganese ore were characterized using XRD, XRF and SEM, before being ground further into very fine particle sizes going through a preliminary leaching process. Sulfuric acid was chosen as the leachant, and leaching was done without any presence of reducing agents.
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8

Munir, Badrul, Sulaksana Permana, Anggita Amilia, Ahmad Maksum, and Johny W. Soedarsono. "Initial Study for Cerium and Lanthanum Extraction from Bangka Tin Slag through NaOH and HClO4 Leaching." MATEC Web of Conferences 269 (2019): 07003. http://dx.doi.org/10.1051/matecconf/201926907003.

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The global demand for rare earth elements have increased dramatically for the last decade as more and more devices use rare earth elements as key for their advanced properties. The paper explores the possibilty to recover cerium (Ce) and lanthanum (La) in Bangka tin slag (BTS) involving roasting at 900°C, water-quenching, and two leachings, 8M NaOH leaching and HClO4 leaching at concentrations of 0.1M, 0.4M, and 0.8M. HClO4 leaching causes Ce and La contents to decrease to 0.47% for 0.1M, 0.51% for 0.4M, and 0.59% for 0.8M. On the other hand, 8M NaOH optimizes cerium and lanthanum contents up
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9

Keel, Kevin R., Charles H. Gilliam, Glenn R. Wehtje, Tim L. Grey, Gary J. Keever, and Donald J. Eakes. "Herbicide Adsorption and Release Properties of Five Oxadiazon-Coated Fertilizers." Journal of Environmental Horticulture 16, no. 4 (1998): 230–34. http://dx.doi.org/10.24266/0738-2898-16.4.230.

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Abstract Laboratory experiments were conducted to determine the release of oxadiazon coated on control-release fertilizers. Five fertilizers and glass beads (nonabsorbent control) were coated with 14C-oxadiazon + formulated oxadiazon at a herbicide-to-fertilizer concentration of 0.3 mg ai/g. Coated fertilizers were subjected to 14 consecutive daily water leaching events. For the control-release fertilizers, Nutricote, Meister and Osmocote, 70%–80% of the coated oxadiazon was released in the first 3 leaching events; each leaching event after the 7th leaching event contained less than 1% of tota
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10

Ma, Guo Jun, Hui Tang, and Yi Biao Jin. "Mineral Sequestration of CO2 Using Basic Oxygen Furnace (BOF) Steelmaking Slag." Advanced Materials Research 194-196 (February 2011): 2140–44. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2140.

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A promising option for long-term storage of CO2 is to fix CO2 by industrial solid wastes, such as basic oxygen furnace (BOF) steelmaking slag. It is advantage to use BOF steelmaking slag to fix CO2, such as large volume of BOF steelmaking slag, low price of raw materials, close to the CO2 emission sources, and no secondary pollution. It is of great significance to the CO2 emissions reduction and solid waste disposal in the ironmaking and steelmaking plant. In this paper, the leaching process, impurities removing and carbonation of steelmaking plant waste slag were studied at ambient pressure.
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11

Yang, Jinlin, Xingnan Huo, Zongyu Li, and Shaojian Ma. "Study on Hydrometallurgical Treatment of Oxide Ores Bearing Zinc." Minerals 12, no. 10 (2022): 1264. http://dx.doi.org/10.3390/min12101264.

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As the depletion of zinc sulfide ores becomes more severe, investigations into the recovery of zinc from zinc oxide ores have aroused more interest. In this regard, acid-based hydrometallurgical treatment strategies have had great effectiveness. However, they are inadequate for low-grade zinc oxide ores. In this study, we examined the alkaline treatment of gossan for the recovery of oxide ores that bear zinc, such as siderite and limonite. Additionally, of particular note, the effects of a leaching agent, its concentration and time, temperature, liquid-to-solid ratio, as well as the agitation
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12

Cheng, Jun Hua, Jian Zhang, and Di Jiang Wen. "Comparison of Leaching Characteristics of Lead in Waste CRTs." Advanced Materials Research 177 (December 2010): 470–74. http://dx.doi.org/10.4028/www.scientific.net/amr.177.470.

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This study investigates four extraction methods (water extraction, toxicity characteristics leaching procedure (TCLP), modified TCLP with pH control and sequential chemical extraction (SCE)), each representing different liquid-to-solid (L/S) ratios, pH controls, and types of leachant and their effects on the leaching concentration of Pb in cathode ray tubes (CRTs).The results indicated that for extraction with distilled water,the lead leaching concentration (mg/L) decreased with L/S ratio in the range of 2-100. The results also showed that the leaching concentration was strongly pH-dependent i
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13

Leelarungroj, Kittitat, Suched Likitlersuang, Thanakorn Chompoorat, and Dao Janjaroen. "Leaching mechanisms of heavy metals from fly ash stabilised soils." Waste Management & Research: The Journal for a Sustainable Circular Economy 36, no. 7 (2018): 616–23. http://dx.doi.org/10.1177/0734242x18775494.

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Fly ash is an industrial waste material that is repurposed as a soil stabiliser worldwide. In Thailand, many ground improvement projects utilise mixtures of cement and fly ash to stabilise weak soils. In this study, leaching mechanisms of arsenic, chromium, lead, and zinc from cement and fly ash stabilised soils were investigated in the laboratory. Leaching tests were performed, with different leachants and pH conditions, on cement and fly ash stabilised soils used for soil improvement in road embankment construction projects in Northern Thailand. The results suggested that chemical compounds
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14

Zhang, Yanhao, Haohan Zhang, Zhibin Zhang, et al. "pH Effect on Heavy Metal Release from a Polluted Sediment." Journal of Chemistry 2018 (August 23, 2018): 1–7. http://dx.doi.org/10.1155/2018/7597640.

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The performance of Cd, Ni, and Cu release from river sediment at different pH was investigated by a leaching test using deionised water and river water as leachants. Visual MINTEQ geochemical software was used to model the experimental results to predict heavy metal release from sediments. The distribution and speciation of heavy metals in the sediments after leaching test were analyzed by Tessier sequential extraction. Leaching test results showed that the release amounts of Cd, Ni, and Cu are in the range of 10.2–27.3 mg·kg−1, 80.5–140.1 mg·kg−1, and 6.1–30.8 mg·kg−1, respectively, with deio
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15

Yang, Jing, Wenqi Guo, Chengsen Zhao, et al. "Increased Soil Soluble Nitrogen Stocks and Decreased Nitrogen Leaching Loss in Rice Paddy Soil by Replacing Nitrogen Fertilizer with Chinese Milk Vetch." Agronomy 14, no. 4 (2024): 715. http://dx.doi.org/10.3390/agronomy14040715.

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Reducing soil nitrogen leaching losses and improving nitrogen-use efficiency with effective fertilization management strategies are extremely important for sustainable agricultural development. A 2-year field study was executed with the same nitrogen input in a subtropical rice production system in Southeast China, using chemical fertilizers as a control (CK), to study the influences of different application amounts of Chinese milk vetch (CMV), i.e., 15,000 kg hm−2 (CL), 30,000 kg hm−2 (CM), and 45,000 kg hm−2 (CH), on soil soluble nitrogen stock and leaching risks in a clay paddy field. The r
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16

Sakai, Shin-ichi, Satoshi Mizutani, and Hiroshi Takatsuki. "Leaching Procedure. Leaching Tests for Waste Materials." Waste Management Research 7, no. 5 (1996): 383–93. http://dx.doi.org/10.3985/wmr.7.383.

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17

Wajima, Takaaki. "Effects of Step-Wise Acid Leaching with HCl on Synthesis of Zeolitic Materials from Paper Sludge Ash." Minerals 10, no. 5 (2020): 402. http://dx.doi.org/10.3390/min10050402.

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Incinerated ash with a relatively high Ca content, paper sludge ash, was converted to zeolitic materials with high cation-exchange capacities (CECs) by aging at 80 °C in NaOH solution via step-wise acid leaching with HCl to reduce the ash Ca content. The extraction of Ca, Mg, Si, and Al from the ash into the acid solutions during leaching and the products obtained from the leached ash by reaction with an alkali were examined. The contents of Ca and Mg in the ash were more easily extracted from the ash than those of Si and Al in the initial leaching. The leachant pH decreased with increasing nu
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18

Dhawan, Heena, and Durlubh Kumar Sharma. "Advances in the chemical leaching (inorgano-leaching), bio-leaching and desulphurisation of coals." International Journal of Coal Science & Technology 6, no. 2 (2019): 169–83. http://dx.doi.org/10.1007/s40789-019-0253-6.

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19

Richter, Constanze, Harald Kalka, and Horst Märten. "Potential Bioleaching Effects in In Situ Recovery Applications." Solid State Phenomena 262 (August 2017): 456–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.456.

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The potential role of microorganisms in the in-situ recovery (ISR) of technology metals, in particular from reduced ores, is not well understood, but attracts increasing interest worldwide. Based on the feasibility criteria for ISR applications in general, effects of biota on kinetic rates of leaching are systematized. The indirect catalysis of leaching by microbial (re-)oxidation of Fe2+ to Fe3+ as directly acting e- acceptor is a well verified mechanism, however, for practical applications this requires the availability of an oxidant in the leachant. The ex-situ bio-oxidation of Fe in an aer
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20

Dandautiya, Rahul, Ajit Pratap Singh, and Sanghamitra Kundu. "Impact assessment of fly ash on ground water quality: An experimental study using batch leaching tests." Waste Management & Research: The Journal for a Sustainable Circular Economy 36, no. 7 (2018): 624–34. http://dx.doi.org/10.1177/0734242x18775484.

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The fly ash, generated at the coal-based thermal power plant, is always a cause of concern to environmentalists owing to its adverse impact on air, water and land. There exists a high environmental risk when it is disposed to the environment. Thus, two different type of fly ash samples (FA-1 and FA-2) have been considered in this study to examine the leaching potential of the elements magnesium, aluminium, silicon, calcium, titanium, vanadium, chromium, manganese, iron, nickel, cobalt, copper, zinc, arsenic, selenium, strontium, cadmium, barium and lead for different types of leachant. Toxicit
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21

Delmas, Francisco, Lucinda Gonçalves, Isabel M. Martins, and Manuela Oliveira. "Magnesium Removal from TiC-TiB2 SHS-Powders by Controlled Hot Acid Leaching." Materials Science Forum 514-516 (May 2006): 594–98. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.594.

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TiC and TiC–TiB2 powder mixtures obtained directly from titanium (TiO2) and boron (B2O3 or B4C) raw-materials by reduction with magnesium by self propagating high temperature synthesis (SHS) contain, as impurity, large quantities of MgO under its periclase form, together in some cases with unreacted magnesium. Several leaching agents, namely hydrochloric acid, sulphuric acid, acetic acid and EDTA were tested aiming at removal of magnesium from these powders as required characteristic for further work. Several parameters as leachant concentration, pH, reaction time and temperature were evaluate
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22

Guerra, R. N. G., Carlos A. Nogueira, and Fernanda Margarido. "Leaching Studies of Spent Zinc-Manganese Alkaline Batteries with Sulphuric Acid." Materials Science Forum 587-588 (June 2008): 763–67. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.763.

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The hydrometallurgical processing of metal bearing residues is one of the established routes envisaging metals recovery. In these processes, the leaching operation plays a central role as allows the solubilization of metals for further separation and recovery as pure products. This route can be applied to spent domestic batteries recycling, which studies on sulphuric acid leaching of spent alkaline batteries are reported in this paper. Material samples used in the trials were prepared concerning the real proportion of the most common sizes and shapes of batteries found in the usual stream of t
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23

Lu, Rong Rong, Yi He Zhang, Feng Shan Zhou, and Xin Ke Wang. "Research of Leaching Alumina and Iron Oxide from Bayer Red Mud." Applied Mechanics and Materials 151 (January 2012): 355–59. http://dx.doi.org/10.4028/www.scientific.net/amm.151.355.

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Adopting Bayer red mud as raw material, researching five acid leaching of alumina and iron oxide methods, hydrochloric acid leaching, sulfuric acid leaching, mixed acid leaching and two methods of classification acid leaching, affecting on leaching ratio of Al and Fe in red mud. All the five acid leaching experiments have a good effect on the leaching ratios of alumina and iron oxide. The highest leaching ratios of alumina and iron oxide are 90.1% and 99.0% when the volume of hydrochloric acid and sulfuric acid are 25mL in the mixed acid leaching. Finally, obtain better condition of preparing
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24

Yang, Jin Lin, Shao Jian Ma, Wei Mo, Jin Peng Feng, Xiu Juan Su, and Gui Fang Wang. "Study on Recovering Zinc from Gossan." Advanced Materials Research 454 (January 2012): 329–32. http://dx.doi.org/10.4028/www.scientific.net/amr.454.329.

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In this paper, the conventional physical separation method such as flotation, gravity separation, magnetic separation, alkaline leaching and sulfuric acid leaching were studied. The effects of grinding fineness, amount of agent, magnetic intensity, roasting temperature, roasting time, the leaching agent and leaching time on the leaching of zinc were investigated, respectively. The results show that the leaching rate of zinc is below 50% in the conventional alkaline leaching, and the leaching rate of zinc is below 85% and the leaching rate of iron is above 35% in sulfuric acid leaching. Compare
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25

Perdana, Indra, Muhammad Irfan Rahman, Doni Riski Aprilianto, Himawan Tri Bayu Murti Petrus, and Divita Hayyu Kinanti. "Kinetics and Thermodynamics Study of Ammonia Leaching on Spent LMR-NMC Battery Cathodes." Indonesian Journal of Chemistry 24, no. 3 (2024): 876. http://dx.doi.org/10.22146/ijc.93312.

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The recycling of spent lithium NMC-type batteries, widely used in electric vehicles, presents a challenge due to manganese content, which complicates metal separation and purification. This study explored a selective leaching process using ammonia to recover metals from high-manganese-content LMR-NMC cathodes. By adjusting the (NH4)2SO4 reagent concentration to 1–2 M and maintaining the temperature between 50–80 °C, the recovery rates of lithium, nickel and cobalt metals were enhanced, leaving manganese primarily as residue in the form of Mn(OH)₂ and (NH4)2Mn(SO4)2. A kinetics model, integrati
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26

Zhang, Zhenyue, Jing Yang, Wenda Guo, et al. "Analysis and Prediction of the Leaching Process of Ionic Rare Earth: A Data Mining Study with Scarce Data." Minerals 14, no. 6 (2024): 596. http://dx.doi.org/10.3390/min14060596.

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To unveil the impact of each condition variable on the leaching efficiency index during the heap leaching process of rare earth ore and establish a prediction model for leaching conditions and efficiency, common parameters in the heap leaching process of rare earth ore were selected. In addition, the pilot-scale test data were collected over 50 days. Based on the collected data, the Ordinary Least Squares (OLS) linear regression method was used for fitting analysis to determine each variable’s influence on the change in leaching efficiency. The results indicated a linear relationship between t
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27

Devasia, Preston, and K. A. Natarajan. "Bacterial leaching." Resonance 9, no. 8 (2004): 27–34. http://dx.doi.org/10.1007/bf02837575.

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Xu, Zhigao, Gang Li, Huifang Yang, et al. "Development Review on Leaching Technology and Leaching Agents of Weathered Crust Elution-Deposited Rare Earth Ores." Minerals 13, no. 9 (2023): 1223. http://dx.doi.org/10.3390/min13091223.

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Weathered crust elution-deposited rare earth ores are key strategic resources and the main source of medium and heavy rare earths. This paper summarizes the development of leaching technology of rare earth ores, compares the advantages and disadvantages of the three generations of leaching technology, and introduces the improved heap leaching technology and the new technology of the leaching–extraction integration and enhanced leaching, focusing on the leaching of weathered crust elution-deposited rare earth ores. In this paper, the development of the leaching agents is expounded, and the rese
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29

Wijayanti, Ima, Joko Santoso, and Agus M. Jacoeb. "The Effect of Leaching Times on the Gel Properties of Catfish (Clarias gariepinus) Surimi." Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology 8, no. 1 (2012): 32–37. https://doi.org/10.14710/ijfst.8.1.32-37.

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The effect of leaching times on the proximate composition and gel properties of surimi has been studied in this research. Leaching times significantly influenced the chemical composition of catfish surimi. The raise of leaching times increased the water content and decreased protein, fat and minerals composition of catfish surimi. Water holding capacity value of surimi gel by leaching 3 times increased 29.78% compared to leaching one time. Deformation increased with the rising of leaching times. The highest deformation was reached by leaching 4 times with raising 74.27% compared to leaching on
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30

Yang, Huifang, Aoyang Sha, Zhengyan He, et al. "Study on the Leaching Kinetics of Weathered Crust Elution-Deposited Rare Earth Ores by Hydroxypropyl Methyl Cellulose." Minerals 13, no. 9 (2023): 1156. http://dx.doi.org/10.3390/min13091156.

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In the process of the in situ leaching of weathered crust elution-deposited rare earth ores (WCE-DREOs), there are many problems in the conventional leaching agent, such as a slow leaching rate, low leaching yield and long leaching period. In order to solve the above problems, 2.0 wt% ammonium sulfate was mixed with hydroxypropyl methyl cellulose (HPMC). The effects of the HPMC concentration, temperature, pH and flow rate on the leaching kinetics of rare earth (RE) and aluminum (Al) were investigated. The results showed that when the concentration of HPMC was 0.05 wt%, the leaching equilibrium
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31

Oliveira, Paula C., M. C. Rosa, Lucinda Gonçalves, Maria A. Trancoso, and Carlos A. Nogueira. "Acid Leaching of Leather Tanning Sludges: Metals Behaviour." Materials Science Forum 587-588 (June 2008): 758–62. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.758.

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Sludges generated in leather tanning processing are very complex wastes with potential deleterious effect on the environment and its management constitutes a high cost for the companies. In this work, sludges from a Portuguese tanning company were characterized and leached with acid solutions in order to evaluate the metals removal yields. The sludges contain, as main metals, 15% Ca, 5% Fe and 2.2 % Cr, in a dry basis. Other minor elements namely Al, Ti, Zn, Pb and Cu were also detected. The leaching experiments were carried out with two types of acids – hydrochloric and sulfuric – and the eff
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32

Han, Zhongchen, Keqiang Xie, Zhixiang Wang, and Junyu Qu. "Study on Vanadium Leaching from Vanadium and Ferro-Titanium Concentrate Using Calcified Roasting Pellets and Sulfuric Acid at Constant pH." Minerals 15, no. 6 (2025): 580. https://doi.org/10.3390/min15060580.

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This study proposed a selective leaching method to address the challenge of excessive iron (Fe) leaching during a sulfuric acid treatment of magnetite pellets, which complicates the subsequent extraction and precipitation of vanadium (V). The approach involved constant-pH sulfuric acid leaching of calcined and roasted vanadium–titanium (V–Ti) magnetite pellets to enhance V recovery while minimizing Fe dissolution. A comparison between constant-pH leaching and conventional heap leaching was conducted. The results showed that, under optimal leaching conditions, the V leaching rate remained large
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33

Young, John R., E. Jay Holcomb, and Charles W. Heuser. "Greenhouse Growth of Marigolds in Three Leached Sources of Spent Mushroom Compost over a 3-Year Period." HortTechnology 12, no. 4 (2002): 701–5. http://dx.doi.org/10.21273/horttech.12.4.701.

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Though high electrical conductivity (EC) levels are commonly held to be the primary limiting factor for using spent mushroom compost (SMC) as a growing substrate, EC can be reduced by leaching. This allowed SMC to be successfully used for growing plants. Leaching reduced EC of the substrate solution from as high of 30 dS·m-1 (mmhos·cm-1) to 2 to 3 dS·m-1, a level acceptable for growing plants. The initial EC and container capacity determined the number of leachings and total volume of water required to lower EC of SMC substrates to acceptable levels. As the concentration of SMC was increased,
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34

Wu, Xiaoyan, Jian Feng, Fang Zhou, Chufan Liu, and Ruan Chi. "Optimization of a Rare Earth and Aluminum Leaching Process from Weathered Crust Elution-Deposited Rare Earth Ore with Surfactant CTAB." Minerals 14, no. 3 (2024): 321. http://dx.doi.org/10.3390/min14030321.

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Ammonium sulfate is typically employed as a leaching agent in the in situ leaching of weathered crust elution-deposited rare earth ore. However, it is associated with challenges such as low efficiency in mass transfer for rare earth (RE) leaching, high usage of the leaching agent, and prolonged leaching duration. To address the issues mentioned above, the surfactant cetyltrimethyl ammonium bromide (CTAB) was compounded with 2% ammonium sulfate to form a leaching agent in this paper. The effects of CTAB concentration, temperature, pH, and leaching agent flow rate on the rare earth (RE) and alum
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35

Liu, Song Li. "Experimental Study of Leaching Scandium from Chloride Dust." Advanced Materials Research 548 (July 2012): 305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.548.305.

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Scandium is concentrated in the dust during TiO2 chlorization. The dust can be used as a raw material from which Scandium is extracted. Scandium leaching conditions such as leaching acid concentration , liquid-solid ratio , leaching temperature and leaching time is investigated with chemical analysis through the orthogonal experiment. The results show that the optimum leaching conditions is: chloride dust particle size is 44 μ m, leaching acid concentration is 15%, liquid-solid ratio is 2:1, leaching temperature is 28 °C, leaching time is 1 h.
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36

Zhu, Chao, Bao Liang Ge, Zhao Yi Lu, and Wen Zhu. "Biooxidation Pretreatment Cyanide Leaching of a Flotation Gold Concentrate." Advanced Materials Research 581-582 (October 2012): 1106–9. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.1106.

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This study reached a gold ore which contain 3.83g/t gold, to investigate the available gold recover methods, direct cyanide leaching test and “biooxidation-cyanide” leaching process were utilized after enrich gold by flotation. When regrinding the flotation concentrate to 95% -325mm, the leaching rate of “biooxidation-cyanide” leaching reached 94.47%, compare with direct leaching, the leaching rate increased almost 67%. Obviously bacterium oxidation is a useful pretreatment for gold leaching.
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37

Zhang, Gui Fang, Peng Yan, and Qing Rong Yang. "Experimental Study on Concentrating Scandium by Leaching from Associated Scandium Ore." Advanced Materials Research 734-737 (August 2013): 1033–36. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.1033.

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Based on the benefication of the complex silicate ore containing scandium, the research about aid-leaching agent used in the leaching of the scandium concentrate was been conducted. And the suitable leaching agent and aid-leaching agent which the useful ions entered into leaching liquid and the harmful ions were kept in leaching residue were been found according to the experiment results. For the scandium of sample existed various complex silicate ore as isomorphism form, the research has adopted hydrochloric acid with aid-leaching agent to dissociate the silicate ore and make scandium enterin
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38

Chen, Kaihua, Jiannan Pei, Shaohua Yin, Shiwei Li, Jinhui Peng, and Libo Zhang. "Leaching behaviour of rare earth elements from low-grade weathered crust elution-deposited rare earth ore using magnesium sulfate." Clay Minerals 53, no. 3 (2018): 505–14. http://dx.doi.org/10.1180/clm.2018.37.

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ABSTRACTThe present study investigates the use of magnesium sulfate (MgSO4) instead of (NH4)2SO4 as a lixiviant in the recovery of rare earth elements (REEs) from clays. Experiments were carried out to investigate the influence of leaching conditions such as leaching time, lixiviant concentration and liquid:solid ratio on the leaching efficiency. The optimum leaching conditions, leading to 75.48% of total REE leaching efficiency, required a stirring speed of 500 rpm, a leaching time of 30 min, a lixiviant concentration of 3 wt.% and a liquid:solid ratio of 3:1. After extension of the leaching
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39

Chen, Yanbo, and Junjie Wang. "Experimental Study on the Dressing and Smelting of a Pyrrhotite-bearing Primary Gold Ore." E3S Web of Conferences 385 (2023): 03005. http://dx.doi.org/10.1051/e3sconf/202338503005.

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The content of pyrrhotite in a primary gold mine containing pyrrhotite is 0.68%. In the process of alkaline leaching pretreatment, there are problems such as large ore quantity and high alkali consumption. In the process of cyanide leaching, there are problems such as high cyanide consumption and slow gold leaching rate. In order to solve these problems, combined with production practice, experimental studies on magnetic separation, magnetic separation tailings leaching, magnetic separation concentrate alkali leaching pretreatment - leaching, magnetic separation concentrate flotation - cyanide
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40

He, Qiang, Jiang Qiu, Minglu Rao, and Yanfei Xiao. "Leaching Behaviors of Calcium and Aluminum from an Ionic Type Rare Earth Ore Using MgSO4 as Leaching Agent." Minerals 11, no. 7 (2021): 716. http://dx.doi.org/10.3390/min11070716.

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During the leaching process of ionic rare earth ore (ICREO), ion-exchangeable phase calcium (IEP-Ca) and ion-exchangeable phase aluminum (IEP-Al) are leached along with rare earth, which causes many problems in the enrichment process, such as increasing the precipitant agent consumption and rare earth loss, etc. The agitation leaching kinetics and the column leaching mass transfer process of IEP-Ca and IEP-Al were studied to understand the leaching behavior of impurity in ICREO, which provides guides for the adjustment of the leaching process and to limit the co-leaching of impurities. IEP-Ca
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41

Zhang, Lei, Hao Wang, and Yu Li. "Research on the Extract Al2O3 from Coal Gangue." Advanced Materials Research 524-527 (May 2012): 1947–50. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1947.

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The experiments selected Wang Taipu gangue as raw materials and adopted single factor experimental method to study the leaching of aluminum oxide from gangue by using hydrochloric acid as leaching medium. The experiments studied solvent/sample mass ratio, hydrochloric acid/sample, liquid-solid ratio, hydrochloric acid concentration, leaching time and leaching temperature on Al2O3 leaching rate of coal gangue. Through the parallel experiment of the above factors, we can found that optimization conditions of hydrochloric acid leaching of alumina were: solvent /sample mass ratio: 0.20, solvent: N
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42

Yang, Yong Qiang, Cheng Yan Wang, Dun Fang Li, Fei Yin, Yong Qiang Chen, and Xiao Wu Jie. "Study on the Leaching of LiCoO2 in Low H2SO4 Concentration Solutions." Advanced Materials Research 201-203 (February 2011): 1752–56. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1752.

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The leaching behavior of battery grade lithium cobalt oxide (LiCoO2) was studied in Na2SO3-H2SO4 aqueous solutions with low H2SO4 concentration. The effects of H2SO4 concentration, leaching time, leaching temperature, and dosage of Na2SO3 on the leaching rate of LiCoO2 were investigated. The experimental results show that all the cobalt in LiCoO2 can be dissolved in the following conditions: the H2SO4 concentration of 0.4 mol/L, the leaching time of 0.5 h, the leaching temperature of 70°C and the Na2SO3 dosage being equal to the weight of LiCoO2. It is proved that the leaching of LiCoO2 in the
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43

Zhang, Ze Biao, Wan Kun Wang, and Jin Hui Peng. "Innovative Process of Leaching of Nickel Supported Activated Carbon in Ammonium Sulfate." Advanced Materials Research 201-203 (February 2011): 1774–79. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1774.

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The leaching tests of nickel supported activated carbon under normal pressure in (NH4)2SO4were studied. The effects of experimental condition, such as initial concentration of (NH4)2SO4, liquid-to-solid ratio, leaching time and leaching temperature on the leaching rate of nickel, were investigated. The results show that the leaching rate of nickel is 96.12% with initial concentration of (NH4)2SO4of 7.5%, liquid-to-solid ratio of 2, leaching time of 5h and leaching temperature of 25°C. The morphology of nickel supported activated carbon before and after leaching was characterized by XRD, which
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44

Cheng, An, Sao Jeng Chao, Wei Ting Lin, and Jia Liang Chang. "Prediction of the Deterioration Depth of Concrete by Accelerating Calcium Leaching Test." Advanced Materials Research 365 (October 2011): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.365.3.

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The concrete is a solid and porous composite materials, when the concrete exposure to moisture environment for a long-term, the pore water will penetrate into concrete cause hydration products leaching. Leaching of calcium ions increase in porosity and resulting in harmful ions ingress into concrete to reduce strength and durability of concrete. The purpose of this study is to evaluate the effect of water-binder ratio on calcium ion leaching behavior of cement-based material. The ammonium nitrate solution was used to accelerate leaching process. Leaching duration was 56 days, 91 days and 140 d
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45

Chen, Yuqian, Junwen Zhou, Libo Zhang, et al. "Microwave-assisted and regular leaching of germanium from the germanium-rich lignite ash." Green Processing and Synthesis 7, no. 6 (2018): 538–45. http://dx.doi.org/10.1515/gps-2017-0137.

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Abstract Demand for germanium (Ge) is rapidly growing in recent years in various fields including semiconductors, aerospace, and solar cells. However, the Ge resources are very limited in the world. Hence, in this work, microwave-assisted leaching and conventional leaching methods are employed for the leaching of Ge from the Ge-rich lignite ash (GA). The effects of leaching temperature, leaching time, initial acid concentration, oxidizing agent amount, and stirring speed on leaching of Ge were investigated and microwave-assisted and conventional methods of leaching were compared. Here, HCl sol
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46

Abdol Jani, Wan Nur Fazlina, Noor Hidayu Abdul Rani, Nor Fadilah Mohamad, and Sharifah Iziuna Sayed Jamaludin. "Hydrometallurgical Recovery of Copper from Computer-Printed Circuit Boards." E3S Web of Conferences 599 (2024): 04006. https://doi.org/10.1051/e3sconf/202459904006.

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Modern electronic devices contain up to 60 different metals, leading to a growing interest in exploring secondary sources, particularly electronic waste (e-waste), to address potential shortages. This study focused on extracting copper (Cu) and gold (Au) from three different sources of computer-printed circuit boards (PCBs): board, USB jack, and capacitor. Aqua regia, a mixture of 68% concentrated nitric acid and 37% concentrated hydrochloric acid in a 1:3 ratio (HNO3=1:3), was used as a leachant under various conditions, including different types of e-waste components, leaching times, and sur
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47

Liu, Dan, Shu Ming Wen, Yong Jun Xian, Hai Ying Shen, Jiu Shuai Deng, and Dan Dan Wu. "Recovery of Copper from Flotation Tailings by Leaching." Applied Mechanics and Materials 325-326 (June 2013): 128–32. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.128.

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A technology route of Reverse flotation of acid-consuming gangue mineralsAcid leaching for copperExtractingElectrodepositing is proposed for recovery copper from a tailings with high content of calcium oxide and magnesium oxide and high content of combined copper oxide. The effect of H2SO4concentration, leaching time and stirring speed on copper leaching was investigated. The leaching solution obtained under the optimal copper leaching conditions, was used to be proceeded for extracting and electrodepositing test. The best leaching conditions are stirring speed of 30 m/min, H2SO4concentration
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48

Bucur, C., C. Ichim, and I. Florea. "14C Release from TRIGA irradiated graphite." Radiocarbon 60, no. 6 (2018): 1819–29. http://dx.doi.org/10.1017/rdc.2018.131.

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ABSTRACTLeaching tests were carried out in aerobic and anaerobic conditions to assess the 14C released from TRIGA irradiated graphite. Both total 14C and inorganic and organic fractions in the leachant solutions were measured. The experimental results obtained from the leaching tests confirm the low 14C release rate in alkaline environment. Less than 2% of the total 14C inventory in the specimens subject to the leaching tests was released as dissolved species. Both inorganic and organic 14C species are released in alkaline conditions, with more inorganic 14C release under aerobic conditions (a
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49

Han, Jiahong, Shujuan Dai, Jiushuai Deng, Shandong Que, and Yugao Zhou. "Technology for Aiding the Cyanide Leaching of Gold Ores." Separations 11, no. 8 (2024): 228. http://dx.doi.org/10.3390/separations11080228.

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Cyanide leaching technology was studied for low-grade oxidized gold ores in Guangxi Province. The gold grade of the raw ores was 1.32 g/t. The gold leaching rate was 90.91% under the optimal conditions for the following conventional leaching process: using steel forging as the grinding medium, a grinding fineness of −0.074 mm accounting for 92.53%, a stirring speed of 1500 r/min, a pulp leaching concentration of 28.57%, a pH value of 10.5, a temperature of 25 °C, a leaching time of 24 h, and a potassium cyanide consumption of 4 kg/t. A new type of mixed aid-leaching agent (0.6 kg/t) was used,
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50

He, Wei, Guo Hua Ye, and Xiong Tong. "Study on Direct Acid Leaching Vanadium without Grinding and Roasting from Clay Vanadium Ore in Hunan." Applied Mechanics and Materials 316-317 (April 2013): 882–86. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.882.

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Abstract：A new technology of direct acid leaching vanadium without grinding and roasting was put forward, and the effects of leaching factors including dosage of sulfuric acid, type and dosage of assistant leaching agent, leaching time and temperature, liquid-solid ratio on the vanadium leaching rate were systematically investigated. The results show that vanadium leaching rate could be up to 92.58% under the optimal conditions of sulfuric acid dosage of 30%, MnO2 as assistant leaching agent and its dosage of 1.5%, leaching time of 6h, leaching temperature of 90°C, liquid-solid ratio of 1:1, a
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