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Thèses sur le sujet « Mineral Processing »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 juillet 2025

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1

Al-Bassam, Ahmed Z. Mohamed Hussein. "Mineral processing using deep eutectic solvents." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42876.

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Processing sulfur containing minerals is one of the biggest sources of acute anthropogenic pollution particularly in the form of acid mine drainage. Sulfur-based minerals are generally roasted to convert them to the oxide, producing SO2 or leached in acid producing H2S. This study attempts to show an innovative method for processing sulfide-based minerals using a deep eutectic solvent (DES), Ethaline, which is a mixture of choline chloride and ethylene glycol. It is shown that pyrite can be solubilised by both electrochemical oxidation and reduction in a DES. A novel method is demonstrated to

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Basnayaka, Lahiru Rasanga. "Influence of Clay on Mineral Processing Techniques." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/74929.

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This PhD thesis investigated the influence of kaolin and bentonite clays in the ore on flotation, filtration and centrifugal concentration. The results showed that the presence of particularly bentonite in the ore had a detrimental effect on flotation and filtration. The information generated from this work will advance our knowledge as well as provide important information for plant metallurgists. The project, therefore, is essential for the mineral industry that process clay-containing ores.

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Agbolosoo, Emmanuel Kwami. "Mineral processing in a less developed country: Bauxite processing in Ghana." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185546.

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The purpose of this dissertation is to evaluate the feasiblity of alumina production in Ghana to replace imported alumina for the production of aluminum. It spells out the conditions which led to the existing bauxite-alumina-aluminum trade in the country. The structure of the economy of Ghana is examined to show the contributions of the important sectors to the total income of the country, and its dependence on a few export commodities for revenue. The plan to build a dam for the generation of hydroelectric power was linked to the establishment of an integrated aluminum industry based on the e

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4

Gwamba, John. "Pearl millet : influence of mineral biofortification and simple processing technologies on minerals and antinutrients." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/60808.

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Pearl millet is an important staple food in rural Africa. However, the mineral bioavailability of pearl millet is low due to its high content of antinutrients, particularly phytate. This research investigated the effects of mineral biofortification, steeping/lactic acid fermentation and parboiling alone and in combination with abrasive decortication of pearl millet grain on its mineral and antinutrient contents. Six normal varieties and two mineral biofortified hybrids were investigated. There was considerable variability in mineral content among the varieties. Iron content ranged from 3.0 to

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5

Goh, Siew Wei Chemistry Faculty of Science UNSW. "Application of surface science to sulfide mineral processing." Awarded by:University of New South Wales. School of Chemistry, 2006. http://handle.unsw.edu.au/1959.4/32912.

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Surface spectroscopic techniques have been applied to facets of the flotation beneficiation and hydrometallurgical extraction of sulfide minerals to enhance the fundamental understanding of these industrially important processes. As a precursor to the determination of surface chemical composition, the sub-surface properties of some sulfide minerals that have not previously been fully characterised were also investigated. The electronic properties of ??-NiS and ??-NiS (millerite), Ni3S2 (heazlewoodite), (Ni,Fe)9S8 (pentlandite), CuFe2S3 (cubanite), CuFeS2 (chalcopyrite), Cu5FeS4 (bornite) and C

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6

Vorster, Werner. "The effect of microwave radiation on mineral processing." Thesis, University of Birmingham, 2001. http://etheses.bham.ac.uk//id/eprint/309/.

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Between 50% and 70% of the total energy used in the extraction process may be attributed to comminution. Microwave pre-treatment has been suggested as a means to decrease the energy requirements. A variety of mineral ores have been investigated and the effects of microwave radiation quantified in terms of the mineralogy, changes in the Bond Work Index, flotability and magnetic separation. It has been shown that microwave pre-treatment is most effective for coarse grained ores with consistent mineralogy consisting of good microwave absorbers in a transparent gangue (up to a 90% decrease in Bond

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Wanigasekara-Mohotti, Don Kripalath. "Optimisation for the synthesis of mineral processing flowsheets." Thesis, The University of Sydney, 1999. https://hdl.handle.net/2123/27597.

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‘Minerals’ is a heuristic—based computer aided design system that implements an evolutionary design methodology to synthesise mineral beneficiaring flowsheets. It has been under developement at the University of Sydney since the 1970s by various post graduate students under the guidance of Professor R. G. H. Prince. In its previous development phases, the models were improved and new process units added. As a consequence, the optimiser used by ‘Minerals’ was no longer able to function properly and a “make do” optimser was implemented.

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8

Treloar-Bradford, Stephen Hall. "The application of artificial intelligence to mineral processing control." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239885.

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9

Okibe, Naoko. "Moderately thermophilic acidophiles and their use in mineral processing." Thesis, Bangor University, 2002. https://research.bangor.ac.uk/portal/en/theses/moderately-thermophilic-acidophiles-and-their-use-in-mineral-processing(9c8b82ee-27ad-453e-baf6-9afb284c7735).html.

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This research project focused on moderately thermophilic acidophilic microorganisms and their role in the oxidation of pyrite. A major objective of the work was to assess the relative efficiencies of defined combinations of moderate thermophiles in oxidising pyrite under defined conditions. In addition, various aspects of the physiology and phylogeny of moderately thermophilic acidophiles were investigated. Moderately thermophilic acidophiles, including novel acidophiles (a thermotolerant Leptospirillum and a Ferroplasma sp. ), were isolated from a commercial stirred-tank pilot plant. Pyrite o

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10

Jirestig, Jan A. "High intensity and high gradient magnetic separation in mineral processing." Doctoral thesis, Luleå tekniska universitet, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25815.

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Natural minerals often lack well defined magnetic susceptibilities. Instead they must be thought of as occurring in a susceptibility range where the bulk susceptibility is affected by present impurities. Inclusions or foreign atoms in solid solution may alter a materials magnetic properties to a large extent. Mixed particles of dia andlor paramagnetic materials display a linear relationship while ferromagnetic inclusions involve a demagnetisation factor. The susceptibility distribution of value minerals in relation to gangue in the ore is the most important factor governing magnetic separation

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Aydin, Gulsen. "Use Of Waste Pyrite From Mineral Processing Plants In Soil Remediation." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613900/index.pdf.

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Pyrite (FeS2) is commonly present in complex sulphide ores in significant amounts. After the enrichment of such ores by flotation, pyrite is either produced as a separate concentrate and sold to acid manufactures or removed and disposed off as tailing. Due to lack of demand from manufacturers, most of pyrites is usually disposed off as tailing. Therefore, pyrite is usually a waste from complex sulphide ores. Yet, it may be a remediation additive for calcareous soils and calcareous- alkali soils deficient in Fe and other micronutrients such as Cu, Zn and Mn. Waste pyrite may be also an alternat

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Ketata, Chefi. "Knowledge-assisted stochastic evaluation of sampling errors in mineral processing streams." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq39321.pdf.

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Koermer, Scott Carl. "The Application of Mineral Processing Techniques to the Scrap Recycling Industry." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/63994.

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The scrap metal recycling industry is a growing industry that plays an important role in the sustainability of a large global metal supply. Unfortunately, recycling lacks many standards, and test procedures in place for mineral processing. These standards and practices, if used in recycling, could aid recyclers in determining and achieving optimal separations for their plant.. New regulations for scrap imports into China make it difficult to obtain the metal recoveries that have been achieved in the past. In order to help scrap yards adhere to the new regulations the Eriez RCS eddy current

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Johnston, Glen Harvey George. "Evaluation of radiation and dust hazards associated with mineral sand processing." Thesis, Queensland University of Technology, 1988. https://eprints.qut.edu.au/35942/1/35942_Johnston_1988.pdf.

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Possible health hazards have been investigated in a mineral sand processing plant to determine the risks to workers contributed by four principal sources: (i) External gamma radiation ii) Inhaled radioactivity in airborne dust particles (iii) Inhaled activity from airborne radon and radon daughter isotopes (iv) Respirable free silica Gamma radiation surveys of the plant working environs using a portable survey meter indicated possible exposure rates ranging from 70 nSv h-1 to a maximum of 50 μsv h- 1 (near a large pile of monazite sand). The average exposure rate was 400 nSv h-1 • Assuming

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15

Pinto, Thiago César de Souza. "Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01042009-101018/.

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O espessamento é uma operação unitária que tem como finalidade separar, por diferença de massa específica entre o sólido e o líquido, sólidos suspensos em meio fluido, pela ação da gravidade. É bastante empregado industrialmente em processos contínuos no adensamento de polpas e minérios, em unidades com reação de precipitação e no tratamento de efluentes, dentre outros. Os equipamentos que realizam esta operação, chamados espessadores, são, em geral, tanques abertos de formato cilíndrico, instalados no eixo vertical com a entrada da suspensão na parte superior central, de fundo ligeiramente cô

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16

Van, Tonder Erika. "The effect of ore blends on the mineral processing of platinum ores." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10982.

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Includes abstract.<br>Includes bibliographical references (leaves 96-101).<br>This thesis investigates the effect of ore blends on milling and flotation performance. Anglo Platinum's Waterval UG2 concentrator in Rustenburg processes ore from various shafts.

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Jeffries, Cameron. "Radiological exposure due to radioactivity carrying aerosols in a mineral sand processing plant." Thesis, Queensland University of Technology, 2002. https://eprints.qut.edu.au/37123/7/37123_Digitised%20Thesis.pdf.

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Mineral sand processing involves a radiological risk due to uranium and thorium series isotopes. Characterising the radioactive aerosol requires measurement of the activity size distribution and the isotopic composition of the aerosol. This is a time consuming process requiring long sampling times and sample counting after a suitable delay time. As a result a number of weeks are required to complete analysis of the activity size distribution. Instrumentation is now available that determines the number and mass distribution within a matter of minutes. Measurements of activity, number and ma

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18

Cleaver, Adam Alexander. "Mixed cultures in mineral processing bioreactors : development of phylogenetic probes for culture analysis." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246794.

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19

Simpson, D. E. "Mathematical modelling and analysis of the uncertainty of networks of mineral processing operations." Thesis, University of Greenwich, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233851.

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20

Wilson, John M. D. (John Murray Duff) Carleton University Dissertation Earth Sciences. "Mineralogical characteristics which affect mineral processing of Faro and Vangorda Ores, Yukon, Canada." Ottawa, 1995.

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21

Robinson, Katie Jane. "Electrochemical studies of rare earth and transition metals in molten NaCl-KCl." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296988.

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22

Kerbey, Mark Henry. "Tag deposition kinetics and selectivity in the magnetic tagging of mineral suspensions." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312285.

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Karlkvist, Tommy. "Selectivity in Calcium mineral flotation - An analysis of novel an existing approaches." Doctoral thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63132.

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24

Hallén, Mattias. "Comminution control using reinforcement learning : Comparing control strategies for size reduction in mineral processing." Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-153273.

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In mineral processing the grinding comminution process is an integral part since it is often the bottleneck of the concentrating process, thus small improvements may lead to large savings. By implementing a Reinforcement Learning controller this thesis aims to investigate if it is possible to control the grinding process more efficiently compared to traditional control strategies. Based on a calibrated plant simulation we compare existing control strategies with Proximal Policy Optimization and show possible increase in profitability under certain conditions.

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Kam, Kiew M. "Simulation and implementation of nonlinear control systems for mineral processes." Thesis, Curtin University, 2000. http://hdl.handle.net/20.500.11937/2383.

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Differential geometric nonlinear control of a multiple stage evaporator system of the liquor burning facility associated with the Bayer process for alumina production at Alcoa Wagerup alumina refinery, Western Australia was investigated.Mathematical models for differential geometric analysis and nonlinear controller synthesis for the evaporator system were developed. Two models, that were structurally different from each other, were used in the thesis for simulation studies. Geometric nonlinear control structure, consisting of nonlinear state feedback control laws and multi-loop single-input s

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Ericksson, Cristiane. "Estudo de caso, replicação, padronização e otimização de técnicas de tratamento de gemas : processos de tingimento de ágata do Rio Grande do Sul." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/172053.

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A ágata do sul do Brasil apresenta colorações pouco interessantes ou salientes, sendo predominante os tons acinzentados. Tais qualidades foram fatores determinantes para o início do processo de tingimento de ágata do Rio Grande do Sul, no século XVIII. Atualmente, o segmento mineral, apresenta carências relacionadas a tecnologias e processos de produção, além de infraestruturas inadequadas, resultando em prejuízo para as comunidades produtoras. Nesse cenário, a pesquisa se estrutura para avaliar técnicas operacionais viáveis para o setor, objetivando a melhoria do valor agregado às gemas benef

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Schropp, Christian [Verfasser]. "Integrated mineral processing in underground mining operations and impact on the mine project / Christian Schropp." Düren : Shaker, 2019. http://d-nb.info/1198599790/34.

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Kam, Kiew M. "Simulation and implementation of nonlinear control systems for mineral processes." Curtin University of Technology, School of Chemical Engineering, 2000. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10063.

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Differential geometric nonlinear control of a multiple stage evaporator system of the liquor burning facility associated with the Bayer process for alumina production at Alcoa Wagerup alumina refinery, Western Australia was investigated.Mathematical models for differential geometric analysis and nonlinear controller synthesis for the evaporator system were developed. Two models, that were structurally different from each other, were used in the thesis for simulation studies. Geometric nonlinear control structure, consisting of nonlinear state feedback control laws and multi-loop single-input s

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Muryanto, Stefanus. "The role of impurities and additives in the crystallisation of gypsum." Thesis, Curtin University, 2002. http://hdl.handle.net/20.500.11937/2038.

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Scale formation is one of the persistent problems in mineral processing and related industries. One of the main components of the scale is frequently gypsum or calcium sulphate dihydrate (= CaS04.2H20). Gypsum is formed through the process of crystallisation, and it is well known that crystallisation process is significantly affected by the presence of admixtures. Industrially, scale formation occurs in an environment which is very rarely free from the presence of admixtures. In a typical mineral processing industry, certain types of admixtures are present, which may include metallic ions (e.g

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Harris, Jeff R. "Processing and integration of geochemical data for mineral exploration: Application of statistics, geostatistics and GIS technology." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6421.

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Geographic Information Systems (GIS) used in concert with statistical and geostatistical software provide the geologist with a powerful tool for processing, visualizing and analysing geoscience data for mineral exploration applications. This thesis focuses on different methods for analysing, visualizing and integrating geochemical data sampled from various media (rock, till, soil, humus), with other types of geoscience data. Different methods for defining geochemical anomalies and separating geochemical anomalies due to mineralization from other lithologic or surficial factors (i.e. true from

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Kan, Wen Hao. "The Development of Ferrous Metal Matrix Composites for Use in the Mining and Mineral Processing Industry." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18272.

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The mining and mineral processing industries feature very harsh service environments that often severely limit the service life of components and equipment used. High Cr white cast irons are usually the material of choice for many high wear applications that also require some amount of corrosion resistance. The excellent wear performance of these alloys is attributed to both a volume fraction of hard Cr carbides (a ceramic phase) and a hard, corrosion resistant ferrous matrix. These alloys present, however, poor fracture toughness. This thesis proposes that stainless steel matrix composites re

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Boshoff, Genevieve Ann. "Development of integrated biological processing for the biodesalination of sulphate- and metal-rich wastewaters." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1003958.

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The substantial pollution threat to the South African environment from acid mine drainage (AMD) effluents has been well documented. Due to the juvenile nature of acidity in these flows, any remediation strategies implemented will need to function effectively and at low cost for long periods of time. The widespread use of sulphate reducing biological systems for the treatment of such effluents, and in particular large volume flows, has been limited. The supply of inexpensive electron donor and carbon sources, as well as appropriate reactor designs capable of handling large volume flows, have be

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Gantenbein, Daniel. "Development of mineral particle surfaces for the adsorption of pitch from wood processing and recycling of paper." Thesis, University of Plymouth, 2012. http://hdl.handle.net/10026.1/1175.

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During the production of paper in paper mills, detrimental wood resin is released into the water circuit of the mill during the pulping process of the wood into fibres. This wood resin, termed pitch, can detrimentally deposit on the paper and on the paper machine equipment. The deposits mark the paper or can lead to a tear of the paper web involving a loss of output and a reduction in paper quality. Furthermore, the wood resinous compounds in paper mill effluents need to be reduced in order to minimise their toxic effects on water organisms. Talc has been the benchmark for many years as a mine

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Cruz, Eva Brunilda. "A Comprehensive Dynamic Model of the Column Flotation Unit Operation." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30748.

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The core of this project was the development of a column flotation dynamic model that can reasonably predict the changes in the concentrations of all solid and bubble species, along the full column height. A dynamic model of a process is normally composed of a set of partial or ordinary differential equations that describe the state of the process at any given time or position inside the system volume. Such equations can be obtained from fundamental material and/or energy balances, or from phenomenological derivations based on knowledge about the behavior of the system. A phenomenological appr

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Soto, Chris. "Do Clay Minerals affect the thickener operationin Chuquicamata mine, Calama, Chile?" Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77458.

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Chuquicamata mine mineralogy has been studied performing both X-Ray Diffraction (XRD) and X-RayFluorescence (XRF) to determine whether there is any influence in the thickener operations. Thetargeted minerals were the clay group because of their detrimental effect on mining operations asmodify the rheology of the suspensions. The operation stages most affected by the presence of the clayminerals are gravity separation, milling, conveyor belts, flotation and specially thickener operations. Inorder to cope with Chuquicamata production, the plant is constantly fed from a neighboring ore calledRado

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Al-Ali, Safaa Hussein Ali. "Mineralogy and mineral processing to optimise recovery of synchysite-(Ce) and apatite from carbonatite at Songwe Hill, Malawi." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/28823.

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Rare earth elements (REE) are considered as critical and non-substitutable metals for electronics and green technology. A greater diversity of supply is needed and the REE occur in a wide range of REE- and REE-bearing minerals within different ore deposit types. The beneficiation processes for REE ores can vary widely based on their mineralogy and texture. It is, therefore, essential to understand the mineralogical characteristics when designing processing routes. Little research was carried out on this topic until the last few years, apart from bastnäsite, monazite, and xenotime, and most REE

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Cai, Wenlong. "Application of network flow and zero-one programming to open pit mine design problems." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184797.

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An algorithm which adopts a moving cone approach but is guided by maximal network flow principles is developed. This study argues that from a network flow point of view, the re-allocation problem is a major obstacle to prevent a simulation oriented pit design algorithm from reaching the optimum solution. A simulation oriented pit design algorithm can not resolve the re-allocation problem entirely without explicit definition of predecessors and successors. In order to preserve the advantages of moving cone algorithm and to improve the moving cone algorithm, the new algorithm trys to avoid the r

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Alves, Paula Regina. "The carbonatite-hosted apatite deposit of Jacupiranga, SE Brazil: styles of mineralization, ore characterization and association with mineral processing." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/prayb4_09007dcc804f7bd9.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2008.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 9, 2008) Includes bibliographical references (p. 131-139).

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Opoubou-Lando, Serge-Driver. "Mineralogical characterisation of chromite in the UG2 Reef from Waterval Mine, Western bushveld : implications for minerals processing." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4380.

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Thesis (MSc (Earth Sciences))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The Bushveld Complex of South Africa contains three of the most important platinum deposits in the world namely the Merensky Reef, the Upper Group Two (UG2) chromitite reef and the Platreef. These three ore bodies are principally beneficiated by froth flotation. During the beneficiation of chromite hosted PGE’s by froth flotation, chromite represents the principal gangue mineral. This is particularly true for the UG2 main seam. An excess of more than 3% in mass of chromite in the PGM concentrate is known

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Shashikala, A. R. "Role Of Interfacial Phenomena In Bioprocessing Of Minerals Using Bacillus Polymyxa." Thesis, Indian Institute of Science, 2001. https://etd.iisc.ac.in/handle/2005/246.

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In recent years there has been growing interest in bio-mineral processing due to its low operating costs and its application in processing lean-grade ores. Bioprocessing is a good alternative to conventional hydrometallurgy process in mineral processing. In recent times microorganisms have been used as surface modifiers in processes such as froth flotation and flocculation. The surface properties of microbes and minerals such as zeta potential and surface hydrophobicity play a major role in determining adhesion of microorganisms to minerals and hence, the efficiency of flocculation and flotati

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Shashikala, A. R. "Role Of Interfacial Phenomena In Bioprocessing Of Minerals Using Bacillus Polymyxa." Thesis, Indian Institute of Science, 2001. http://hdl.handle.net/2005/246.

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In recent years there has been growing interest in bio-mineral processing due to its low operating costs and its application in processing lean-grade ores. Bioprocessing is a good alternative to conventional hydrometallurgy process in mineral processing. In recent times microorganisms have been used as surface modifiers in processes such as froth flotation and flocculation. The surface properties of microbes and minerals such as zeta potential and surface hydrophobicity play a major role in determining adhesion of microorganisms to minerals and hence, the efficiency of flocculation and flotati

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Lira, Bonates Eduardo Jorge. "Analysis of truckshovel dispatching policies using computer simulation." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65406.

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Muryanto, Stefanus. "The role of impurities and additives in the crystallisation of gypsum." Curtin University of Technology, Department of Chemical Engineering, 2002. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=14305.

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Scale formation is one of the persistent problems in mineral processing and related industries. One of the main components of the scale is frequently gypsum or calcium sulphate dihydrate (= CaS04.2H20). Gypsum is formed through the process of crystallisation, and it is well known that crystallisation process is significantly affected by the presence of admixtures. Industrially, scale formation occurs in an environment which is very rarely free from the presence of admixtures. In a typical mineral processing industry, certain types of admixtures are present, which may include metallic ions (e.g

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Toledo, Nataly Maria Viva de. "Use of fruit processing by-products for the development of cookies: physicochemical, nutritional, technological and sensory aspects." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-13032019-181241/.

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The present study aimed at characterizing pineapple, apple and melon by-products and evaluating their potential as an ingredient for the partial substitution of wheat flour in cookie formulations. The addition of fruit by-products contributed to rise the cookies fiber content. Melon by-product was prominent for its mineral content, whereas apple by-product presented more relevant results for phenolic compounds and antioxidant capacity (DPPH and ABTS). Such behaviors reflected in the cookie formulations. Eight phenolic compounds (vanillic acid, gallic acid, sinapic acid, salicylic acid, p-couma

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Alexander, Jennifer Mary. "Optical properties of mineral dust aerosol including analysis of particle size, composition, and shape effects, and the impact of physical and chemical processing." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1819.

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Atmospheric mineral dust has a large impact on the earth’s radiation balance and climate. The radiative effects of mineral dust depend on factors including, particle size, shape, and composition which can all be extremely complex. Mineral dust particles are typically irregular in shape and can include sharp edges, voids, and fine scale surface roughness. Particle shape can also depend on the type of mineral and can vary as a function of particle size. In addition, atmospheric mineral dust is a complex mixture of different minerals as well as other, possibly organic, components that have been m

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Tammia, Rasmus. "Modeling and Control of Lime Addition in a Flotation Process." Thesis, Linköpings universitet, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139331.

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Flotation is an important and versatile mineral processing technique that is used to separate hydrophobic materials from hydrophilic. This technique makes it possible to mine complex ores that otherwise would have been regarded as uneconomic and non-beneficial. In this case flotation is used to separate copper from the unwanted gangue. The addition of lime is used to control the pH level in the flotation’s pulp, which governs the selectivity of the process, i.e. which minerals are recovered. Currently, fluctuating concentration grades of the produced metals have been observed in Boliden Aitik.

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Guiral, Vega Juan Sebastian. "Textural and Mineralogical Characterization of Li-pegmatite Deposit: Using Microanalytical and Image Analysis to Link Micro and Macro Properties of Spodumene in Drill Cores. : Keliber Lithium Project, Finland." Thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70422.

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Lithium represents one of the strategic elements for the rest of the 21st century due to its increasing demand in technological applications. Therefore, new efforts should be focused on the optimization of mineral characterization processes, which link the ore properties with its behaviour during downstream processes. These efforts should result in reducing operational risks and increasing resources utilization. The methodology presented in this study is based on the application of several classification techniques, aiming the mineral and textural characterization of two spodumene pegmatite de

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Nelson, Adam. "New methodologies for the NMR study of calcium phosphate biomaterials and bone mineral." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS292.

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L'ingéniosité avec laquelle les êtres vivants transforment des précurseurs inorganiques et organiques en de nouveaux matériaux est une source d'intérêt constante en science des matériaux. À partir d'une sélection limitée de matières premières, et en s'appuyant uniquement sur des mécanismes biologiques, les organismes ont développé la capacité de synthétiser une large gamme de matériaux, des membranes poreuses jusqu'au bois les plus durs. À travers des millions d'années de sélection, ces matériaux se sont adaptés exactement aux rôles pour lesquels ils sont spécialisés. L'un d'entre eux est l'os

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Udoudo, Ofonime. "Modelling the efficiency of an automated sensor-based sorter." Thesis, University of Exeter, 2010. http://hdl.handle.net/10036/118786.

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For future development of automated sensor-based sorting in the mining industry, an improvement in the separation efficiency of the equipment is desirable. This could be achieved through a better understanding of the identification and separation aspects of the automated sorter. For automated sorters that undertake separation through the use of compressed air jets, the problem of poor separation efficiency has been linked with co-deflection losses. Co-deflection losses occur as particles meant to pass on to the ‘accept’ bin are co-deflected with the particles (which are to be deflected) meant

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Andersson, Emil. "Online Metallurgical Mass Balance and Reconciliation." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185252.

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In mineral processing, one of the most important and versatile separation methods is flotation. Flotation utilizes the different surface properties of the valuable minerals in the ore to separate them from the less valuable gangue material in the ore. Crushed and ground ore is mixed with water and fed into flotation tanks. In the flotation tanks, the particles of valuable mineral are made hydrophobic. That way, they can be floated by attaching to air bubbles and gather on top of the flotation tank as froth. This froth, containing higher concentrations of valuable mineral, is recovered and then

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