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Dissertations / Theses on the topic 'Metal sulphates'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Kinuthia, J. M. "Property changes and mechanisms in lime-stabilised kaolinite in the presence of metal sulphates." Thesis, University of South Wales, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265671.

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2

Palethorpe, S. J. "Calcium sulphate deposition on heated metal surfaces." Thesis, University of Birmingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311098.

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The accumulation of undesired matter at heat transfer surfaces (fouling) is a severe problem to industry. The growth of calcium sulphate dihydrate on heated metal surfaces has been examined and a mechanism for the effect of surface roughness on the amount of deposition has been proposed. A novel piece of equipment was designed and constructed in which the growth of crystals on heat transfer surfaces with different surface roughnesses could be observed under controlled solution conditions. The test section was a transparent rectangular channel into Rhich three 25 mm diameter test pieces could b

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3

Reynolds, Jason Kurt Faculty of Science UNSW. "Hydrogel determined metal bioaccessibility in acid sulfate-affected landscapes." Awarded by:University of New South Wales, 2008. http://handle.unsw.edu.au/1959.4/41436.

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Exposure of sulfidic sediments to atmospheric conditions can under various environmental and anthropogenic influences. The oxidation of sulfides results in the production of acidity, dissolution of aluminosilicates and pedogenci development. This process has acid sulfate landscapes throughout the world identified as major emitters of elevated concentrations of chemical metals. This emission of acidity and metals alters the bioaccessibility and subsequently has a deleterious impact on the surrounding biologic environment. Despite this, the examination of the biologic impact in these landscapes

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4

Pelser, Max. "The control of calcium and magnesium in a base metal sulphate leach solution." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16409.

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Thesis (MScIng)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: This thesis investigates the control of calcium and magnesium in a base metal sulphate leach solution containing nickel and cobalt. The presence of calcium and magnesium in the hydrometallurgical processing of base metals, result in a number of difficulties. These problems range from the contamination of the final product, to high energy consumption and large bleed streams during electrowinning. Calcium poses a greater problem in sulphate solutions due to the low solubility of its sulphate salts. No conventional meth

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5

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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6

Geldenhuys, Andries Johannes. "Water treatment technologies for removal of acid, sulphate and metals / A.J. Geldenhuys." Thesis, North-West University, 2004. http://hdl.handle.net/10394/666.

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7

McKenzie, Joann. "The involvement of sulphate-reducing bacteria in a heterogeneous marine laboratory model." Thesis, University of Aberdeen, 1988. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU027804.

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Sulphate-reducing bacteria are known to play an important role in anaerobic corrosion processes. They are often found associated with metal surfaces and their activities can be of particular economic significance in many industrial areas. The aim of this thesis was to investigate anaerobic corrosion of metals by the sulphate-reducing bacteria in the presence of mixed microbial consortia in various heterogeneous marine environments. A laboratory model system was designed, based on part of an offshore oil storage system. An extensive bacteriological analysis and comprehensive study of the conseq

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8

Bello, Yusuf O. "Tellurium and selenium precipitation from copper sulphate solutions." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95895.

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Thesis (MEng) -- Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The copper sulphate leach solutions produced during the final pressure leach stages in base metal refinery processes contain low concentrations of other precious metals (OPMs, namely Rh, Ru and Ir ) and impurities in addition to the base metals (BMs) of interest. Se and Te impurities, in particular, must be removed from the leach solution before it is fed to copper electrowinning because these species have adverse effects on electrowinning efficiency. Currently, these elements are being precipitated from the leach solution w

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9

Chuichulcherm, Sinsupha. "Configuration and operation of bioreactors for metal removal from wastewater systems using sulphate reducing bacteria." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249226.

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10

Salami, Indah Rachmatiah Siti. "Investigation into remediation of contaminated soil containing high sulphate and heavy metals concentration." Thesis, University of Newcastle Upon Tyne, 1999. http://hdl.handle.net/10443/630.

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This study involved the investigation of a contaminated soil problem in Gateshead, UK. The site was previously a dumping area from industrial activities for over a hundred years and generated problems of high sulphate concentration and heavy metals in both the soil and the leachate which discharges into the River Tyne. The combination of such contaminants has not been widely investigated in the area of contaminated soil. The study was therefore divided into 2 parts, namely bioremediation of the contaminated soil and leachate treatment by reverse osmosis. The bioremediation study involved treat

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11

Kiventerä, J. (Jenni). "Stabilization of sulphidic mine tailings by different treatment methods:heavy metals and sulphate immobilization." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526223964.

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Abstract Millions of tons of mine tailings are generated worldwide annually. Since many valuable metals such as Ag, Cu, Pb, Zn, Au and Ni are usually incorporated into sulphidic minerals, a large proportion of the tailings generated contain high amounts of sulphates and heavy metals. Some of these tailings are used as paste backfill material at mining sites, but large amounts are still being deposited into the tailings dams under water coverage. Sulphidic minerals are stable underground but after mining of the ore and several processing steps these minerals can be oxidized when they come into

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12

Harris, Mark Anglin. "Some organic amendments for heavy metal toxicity, acidity and soil structure in acid-sulphate mine tailings /." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phh3148.pdf.

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13

Rafida, Abdulsalam. "Removal of heavy metals in vertical flow biofilters conditioned with sulphate reducing bacteria (SRB)." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430633.

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14

Saidov, Tamerlan, and Leo Pel. "The formation of meta-stable sodium sulphate heptahydrate during drying as studied by NMR." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192153.

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Salt weathering is a major cause of deterioration of porous building materials. Of the salts responsible, especially sodium sulfate is seen as very damaging. However many questions arise concerning which sodium sulfate phase will crystallize out during salt weathering. In this study we focused on the crystallization during isothermal drying of a sample saturated with a sodium sulfate solution. As the material is drying moisture will leave and hence the salt concentration will rise until the maximum solubility is reached. From that point on crystals will be formed. Using NMR we have measured qu

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15

Saidov, Tamerlan, and Leo Pel. "The formation of meta-stable sodium sulphate heptahydrate during drying as studied by NMR." Diffusion fundamentals 10 (2009) 15, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14106.

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Salt weathering is a major cause of deterioration of porous building materials. Of the salts responsible, especially sodium sulfate is seen as very damaging. However many questions arise concerning which sodium sulfate phase will crystallize out during salt weathering. In this study we focused on the crystallization during isothermal drying of a sample saturated with a sodium sulfate solution. As the material is drying moisture will leave and hence the salt concentration will rise until the maximum solubility is reached. From that point on crystals will be formed. Using NMR we have measured qu

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16

Peck, Mika Robert. "A site-specific tropical sediment toxicity test using Chironomus crassiforceps to investigate metal bioavailability in acid-sulphate sediments." Thesis, University of Stirling, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341247.

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17

Mulwanda, James. "Recovery of dissolved platinum group metals from a pregnant copper sulphate leach solution by precipitation." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86538.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: In Base Metal Refineries (BMRs), the copper sulphate leach solution produced during the final pressure leaching stage contains impurities such as selenium and tellurium, as well as other precious metals (OPMs, namely Rh, Ru, and Ir). Se and Te are removed by precipitation with sulphur dioxide prior to electrowinning of Cu. While a small percentage of the dissolved OPMs precipitate with the Se and Te, the largest portion remains in solution and is recycled to the first stage leach. If a larger portion of the OPMs in solutio

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18

Halsall, John Frederick. "The prevention of biological corrosion and fouling of metals : a study of corrosion processes and the electrochemical methods of controlling corrosion and fouling." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318073.

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19

Parkinson, Shimna Mary. "Use of a laboratory model system to study bacterial activities and interactions in sulphate-reducing biofilms on metal surfaces." Thesis, University of Aberdeen, 1989. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU027805.

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A laboratory model system was developed for the study of the ecology of sulphate-reducing bacteria in biofilms on metal surfaces. The model could be used to generate reproducible biofilms. The model system was used to study biofilm development under aerobic and anaerobic conditions. Under anaerobic conditions, the effect on biofilm development and activity, of varying the nutrient composition and concentration in the bulk phase, was studied. The effect of aeration on biofilm development was also studied, using a modification of the model system. The variations in nutrient regime (using glucose

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20

Runtti, H. (Hanna). "Utilisation of industrial by-products in water treatment:carbon-and silicate-based materials as adsorbents for metals and sulphate removal." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212630.

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Abstract Pollutant (such as metals and sulphate) contamination exists in the wastewaters of many industries, including mining operations, metal plating facilities, and tanneries. Adsorption is one of the most commonly used processes for the removal of pollutants from waters and wastewaters due to its high efficiency and simple operation. Activated carbon is the most frequently used adsorbent material, although its high cost inhibits its widespread use in wastewater treatment. Therefore, there is a need to develop other adsorbents from alternative inexpensive raw materials such as locally avail

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21

Kladova, Anna Vadymivna. "Metals in proteins from sulphate-reducing bacteria: adenylate kinase and ATP sulfurylase. Proteins containing cobalt, zinc, iron (II) ions." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2009. http://hdl.handle.net/10362/6342.

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A Thesis submitted at the Faculty Science and Technology of the New University of Lisbon for a degree in Doctor of Philosophy in Biochemistry with specialization in Physical Biochemistry<br>(fellowship BD SFRH/BD/24744/05)- Foundation for Science and Technology

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22

Karlsson, Lovisa. "Release of elements from unprocessed- and processed shale from Kvarntorp : Effect from different pH." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-28628.

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The alum shale of Sweden is a sulphidic black shale which was mined for its contents of alum during the 17th-19th centuries. During the thirst half of the 20th century alum shale from Kvarntorp was pyrolysed for refinement of its organic matter. The refuse from the pyrolysis process were deposited in a deposit area which is today known as Kvarntorpshögen. This deposit is still hot due to on-going oxidation of the organic matter, pyrite oxidation and the neutralisation of acid by limestone. This heat generation prevents percolation of water to any greater extent due to evaporation. Once it cool

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23

Lazarevic, David Andrew. "In-situ Removal of Hydrogen Sulphide from Landfill Gas : Arising from the Interaction between Municipal Solid Waste and Sulphide Mine Environments within Bioreactor Conditions." Thesis, KTH, Industriell ekologi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32770.

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This project was compiled in co-operation with the Royal Institute of Technology, Stockholm and Veolia Environmental Services (Australia) at the Woodlawn Bioreactor in NSW, Australia. Hydrogen sulphide is an unwanted component of landfill gas, raising occupational health and safety concerns, whilst leading to acid gas corrosion of power generation equipment and increased emissions of SOx, a primary constituent of acidification. Australian governmental requirements to place a periodic cover over the unused proportion of the tipping surface of landfills and bioreactors create an interesting oppo

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24

Fowler, Terry-Ann. "Kinetics of the ferric sulphate leaching of sphalerite and sphalerite/pyrite mixtures : a study of the chemical leaching of base metal minerals under conditions similar to that of bio-leaching by thiobacilli." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/21699.

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Bibliography: pages 98-105.<br>The work presented in this dissertation is an investigation of-the ferric leaching of zinc from sphalerite. A further aspect of this study was an investigation of the influence of pyrite on the dissolution rate of sphalerite due to possible galvanic interactions. This study is one component of a larger study of the sub-processes involved in the bioleaching of sulphide minerals in which the ferric leaching of the sulphide mineral is assumed to be a chemical step with the bacteria oxidising ferrous iron to ferric iron and elemental sulphur, if formed, to sulphate.

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25

Khai, Nguyen Manh. "Effects of using wastewater and biosolids as nutrient sources on accumulation and behaviour of trace metals in Vietnamese soils /." Uppsala : Dept. of Soil Sciences, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200774.pdf.

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26

Mello, Luiz Antonio de Oliveira. "Uso de materiais lígneo-celulósicos, como fonte de carbono para bactérias redutoras de sulfato, na remoção de metais pesados." Universidade do Estado do Rio de Janeiro, 2007. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7384.

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Quando as wetlands alcançam a máxima capacidade de tratamento para remover metais pesados, a remoção ainda pode ocorrer por precipitação na forma de sulfetos devido a redução biológica de sulfato. Para alcançar este objetivo, devem ser promovidas condições anaeróbias, uma fonte de sulfato deve existir e uma fonte adequada de carbono/energia deve estar presente. No presente trabalho, a macroalga Sargassum filipendula e bagaço de cana-de-açúcar (materiais lígneo-celulósicos) foram selecionados como fontes de carbono, devido ao seu acentuado conteúdo de compostos orgânicos de degradação lenta e s

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27

Juholin, P. (Piia). "Hybrid membrane processes in industrial water treatment:separation and recovery of inorganic compounds." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214412.

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Abstract Industrial wastewaters are complex waters, which can contain a large variety of compounds such as heavy metals and salts as well as nutrients, e.g. nitrogen compounds and phosphorous. Prevention of wastewater formation is not always possible and therefore new more efficient water treatment techniques are needed. Legislation also supports the use of more efficient water treatment techniques, which can lead to better purification results and the recovery of valuable compounds from wastewaters. One technique, which has been of interest, is membrane technology. Membrane technology can sep

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28

Walter, Karin. "Influence of acid hydrogen peroxide treatment on refining energy and TMP properties." Licentiate thesis, Mid Sweden University, Department of Natural Sciences, Engineering and Mathematics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-9207.

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<p>The potential of using acid hydrogen peroxide under Fenton conditions to lower the electrical energy consumed during the production of Black spruce (Picea mariana) thermomechanical pulp (TMP) was investigated. The chemical system, which consisted of ferrous sulphate, hydrogen peroxide and optionally an enhancer (3,4-dimethoxybenzyl alcohol, ethylenediaminetetraacetic acid or oxalic acid/sodium oxalate), was evaluated as an inter-stage treatment where the primary refiner was used as a mixer. The produced TMPs were thoroughly characterised in order to explain the effect of the chemical system

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29

Ruto, Sheila. "Reduction of alkaline metal sulphates in a rotary kiln." 2013. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000730.

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30

Yantasee, Wassana. "Kinetic and equilibrium analysis of metal ion adsorption onto bleached and unbleached kraft pulps." Thesis, 2001. http://hdl.handle.net/1957/33250.

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Most metal ions have negative impacts on pulp mill operations. The concentrations of metal ions on pulp fibers and in washwaters rise significantly with increased wastewater recycling. The development of technology to remove these metal ions requires an understanding of how metal ions are bound to pulp components. It is also desirable to predict distribution of metal ions between the pulp fibers and the washwaters. The adsorption isotherms for eight metal ions (Ca, Ba, Mn, Zn, Pb, Cd, Ni, Na) were measured on bleached and unbleached (brownstock) kraft pulps at neutral pH and temperatures rangi

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31

Shepherd, Emily Sarah. "Closing Research Gaps for Cerebral Palsy Prevention and Magnesium Sulphate Neuroprotection." Thesis, 2020. http://hdl.handle.net/2440/126062.

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Background: Cerebral palsy (CP) is the leading cause of physical disability in childhood. Despite emerging evidence that the prevalence of CP has begun to decline, approximately one in 500 babies continue to be affected worldwide. While causes and risk factors for CP are well established, potential preventive interventions are under-researched. Aims: 1. To summarise and interpret the evidence regarding antenatal and intrapartum interventions for preventing CP. 2. To summarise and interpret the evidence regarding neonatal interventions for preventing CP. 3. To link data from a maternal perinata

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32

Anucha, Chukwuka Bethel. "The development and optimization of chemical and biological processes for the treatment of sulphate rich and heavy metal bearing wastewater from acid mine drainage (AMD) by sulphate reducing bacteria (SRB)." Master's thesis, 2016. http://hdl.handle.net/10400.1/9817.

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Dissertação de mestrado, Inovação Química e Regulamentação, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016<br>O tratamento biológico de água de drenagem ácida de mina (“Acid Mine Drainage” - AMD) contaminada com sulfato e metais pesados utilizando bactérias sulfato-redutoras (“Sulphate Reducing Bacteria” – SRB) continua a ser foco de grande atenção. O posicionamento desta estratégia como alternativa viável deve-se às suas vantagens do ponto de vista económico e de sustentabilidade ambiental, comparativamente aos métodos químicos clássicos. Eficiente remoção de sulfato, baix

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33

Vazquez, Jorge Gabriel. "Experimental and Modeling Study of Nickel, Cobalt and Nickel-Cobalt Alloy Electrodeposition in Borate-Buffered Sulphate Solutions." Thesis, 2011. http://hdl.handle.net/10012/5889.

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Nowadays, the development of novel materials involves diverse branches of science as a consequence of the new requirements imposed by modern society. This includes aspects ranging from the optimization of the manufacturing processes to the durability of the materials themselves. Ideally, some synergism should exist between the durability, the properties of interest in the material. Although metals in their pure state are often desired, the best properties or combination of properties often cannot be satisfactorily achieved with a single metal. In these situations, the desired properties can be

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34

Reis, Victor Vinicius. "Potassium and chloride release during black liquor combustion." Thesis, 1994. http://hdl.handle.net/1957/35319.

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