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sulfur species leaching

  • Effects of Reduced Sulfur Species on the Recovery of Gold

    Effects of Reduced Sulfur Species on the Recovery of Gold

    Experimental results showed that average gold and silver recoveries increased by 13.3% and 28.8%, respectively at 500 ppm NaCN and 300 ppm SO32 concentration levels compared to the control experiments where no sulfite was added to the leach slurries.

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  • A Fundamental Study of the Alkaline Sulfide Leaching of Gold

    A Fundamental Study of the Alkaline Sulfide Leaching of Gold

    Sep 19, 20020183;32;Also shown is the mixed potential In caustic sulfur solutions. the leaching rate for gold/silver is calculated to be 2.46V respectively (Hiskey and Atluri. and this decrease can be related to the dissolution rate through Eq. it is likely that this species is the oxidant for gold leaching.

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  • Soil and Fertilizer Sulfur   International Plant Nutrition

    Soil and Fertilizer Sulfur International Plant Nutrition

    Sulfate leaching Sulfate leaching from the root zone with rainfall or irrigation Soil and Fertilizer Sulfur. 8 Better Crops/Vol. 97 (2013, No. 2) lyzed and the time of sampling will vary for each crop species, but generally it involves analysis of young plant parts during

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  • (PDF) Alkaline Sulfide Recovery Of Gold Utilizing Nitrogen

    (PDF) Alkaline Sulfide Recovery Of Gold Utilizing Nitrogen

    Since 1984, nitrogen species catalyzed pressure leaching has been utilized at Sunshine Mining and Refining Company for the recovery of precious metals from a refractory sulfide concentrate.

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  • Oxygenated Leaching of Copper Sulfide Mineral under

    Oxygenated Leaching of Copper Sulfide Mineral under

    sulfur and no other forms of copper sulfide compounds appeared (Fig.3). It has been reported that conventional leaching has the capability to achieve over 90% copper extraction within 30 minutes [10].

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  • A Kinetic and Thermodynamic Modeling Approach   mdpi

    A Kinetic and Thermodynamic Modeling Approach mdpi

    As the leaching of the ore proceeds, the concentrations of the major species change and so does the ionic strength and, consequently, all the activity coefcients and

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  • Elemental Sulphur and Cyanide Reaction   Hydrometallurgy

    Elemental Sulphur and Cyanide Reaction Hydrometallurgy

    I followed elemental sulphur levels for some time and tried to correlate these with cyanide consumption but found that the amount of sulphur present did not account for how much cyanide was used. I have also done numerous tests to try and eliminate other cyanide reactive sulphur species but this did not reduce consumption rates.

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  • Bioleaching of Heavy Metals by Sulfur Oxidizing Bacteria

    Bioleaching of Heavy Metals by Sulfur Oxidizing Bacteria

    Bioleaching of Heavy Metals by Sulfur Oxidizing Bacteria A Review Satarupa Roy and Madhumita Roy* leaching efficiency in the extraction of Fe, Sn and Au. Now these days metal recovery technique is widely practiced for the water species (e.g. Bacillus Micrococcus, Peseudomonas,

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  • PROCESS FOR PRODUCING LOW ASH, LOW SULFUR COAL

    PROCESS FOR PRODUCING LOW ASH, LOW SULFUR COAL

    PROCESS FOR PRODUCING LOW ASH, LOW SULFUR COAL C. W. Fan, R. Markuszewski, and T. D. Wheelock soluble sulfur species (5,6). But if oxydesulfurization is conducted at the leaching step was by itself when not preceded by the oxydesulfurization step.

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  • Bacterial Leaching of Metal Sulfides Proceeds by Two

    Bacterial Leaching of Metal Sulfides Proceeds by Two

    Bacterial leaching, the biooxidation of metal sulfides to soluble metal sulfates and sulfuric acid, is effected by specialized bacteria. Three species of mesoacidophilic, chemolithotrophic bacteria are mainly involved Thiobacillus ferrooxidans, Thiobacillus thiooxidans, and Leptospirillum ferrooxidans.T. ferrooxidans oxidizes reduced sulfur compounds to sulfate and iron(II) to iron(III) ions.

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  • Leaching of marine manganese nodules by acidophilic

    Leaching of marine manganese nodules by acidophilic

    leaching of raw manganese nodules by A. brierleyi growing on elemental sulfur, to examine the dependence of leaching rates on various process parameters, and to compare the

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  • Use of sulphur dioxide as reducing agent in cobalt

    Use of sulphur dioxide as reducing agent in cobalt

    dissolution of copper and cobalt, selective leaching of both species is possible. First, cobalt can be leached in reducing conditions with the use of sulphur dioxide. The second stage Reaction kinetics for the leaching of MnO2 by sulfur dioxide, Hydrometallurgy, May 1983. 3. GILL,

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  • Sulfur dioxide leaching of zinc sulfide   espace.curtin.edu.au

    Sulfur dioxide leaching of zinc sulfide espace.curtin.edu.au

    The non oxidative dissolution reaction generates H2S(aq) or HS (aq) species which are thought to rapidly react with sulfurous acid species, S02(aq) or HS03 (aq), to possibly produce initially sulfane monosulfonates as intermediates, followed by sulfane disulfonates and elemental sulfur.

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  • Acidithiobacillus

    Acidithiobacillus

    Acidithiobacillus ferrooxidans (basonym Thiobacillus ferrooxidans) can be isolated from iron sulfur minerals such as pyrite deposits, oxidising iron and sulfur as energy sources to support autotrophic growth and producing ferric iron and sulfuric acid.

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  • Soil and Applied Sulfur (A2525)   Soil Science at UW Madison

    Soil and Applied Sulfur (A2525) Soil Science at UW Madison

    sulfur. Harvesting and leaching remove sulfur from the sulfur cycle. Crop removal varies from less than 10 lb/a of animal species and with the rate of application (Table 2). About 55% of total manure sulfur becomes available to crops in the year of application. The

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  • A fundamental study of the alkaline sulfide leaching of gold

    A fundamental study of the alkaline sulfide leaching of gold

    A fundamental study of the alkaline sulfide leaching of gold solution also contains polysulfide, it is likely that this species is the oxidant for gold leaching. The potential noting that this is only a metastable E pH diagram, since all the sulfur species are ultimately oxidised to

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  • Bacterial leaching of ores and other materials

    Bacterial leaching of ores and other materials

    Species of this genus, especially S. brierleyi seem to be the main agent in metal leaching at high temperatures. Leptospirillum Often one can see in acid metal leaching biotopes spirilloid bacteria.

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  • PLEASE DO Nar REMOVE FROVI LIBRARY

    PLEASE DO Nar REMOVE FROVI LIBRARY

    Sulfur species in ammonium bisulfide solution 7 4. Quantitative analysis of calcium sulfide prepared from phosphogypsum 8 5. Analyses of ammonium bisulfide solutions 9 sulfur, and (2) leaching the sulfur from the catalyst with liquid anhydrous ammonia. Over 90 pct of the sulfur adsorbed on activated carbon (the catalyst) was recovered by

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  • Alkaline Sulfide Recovery of Gold  Sulfide  Gold

    Alkaline Sulfide Recovery of Gold Sulfide Gold

    ALKALINE SULFIDE RECOVERY OF GOLD UTILIZING NITROGEN SPECIES CATALYZED PRESSURE LEACHING shows the equilibrium sulfur system while Figure 2 [12] shows the meta stable species sulfur system. In reality, the species shown in Figure 2. dominate as the alkaline sulfide system is slow to reach equilibrium .

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  • Microorganisms  Free Full Text  Sulfur Oxygenase

    Microorganisms Free Full Text Sulfur Oxygenase

    The sulfur oxygenase reductase (Sor) catalyzes the oxygen dependent disproportionation of elemental sulfur, producing sulfite, thiosulfate and sulfide. Being considered an archaeal like enzyme, it is also encoded in the genomes of some acidophilic leaching bacteria such as Acidithiobacillus caldus, Acidithiobacillus thiooxidans, Acidithiobacillus ferrivorans and Sulfobacillus

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  • Phosphorus and sulfur cycles   Royal Society of Chemistry

    Phosphorus and sulfur cycles Royal Society of Chemistry

    Phosphorus and sulfur cycles Phosphorus compounds plankton species and gives the seaside it characteristic smell. Photosynthetic sulfur bacteria are able to form free sulfur from hydrogen sulfide gas. Industrial Leaching, run off and sedimentation Figure 2 The sulfur cycle. Death and .

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  • Convert Phosphogypsum to Sulfur

    Convert Phosphogypsum to Sulfur

    Two methods for recovering sulfur from the catalyst were developed (1) thermal treatment to volatilize sulfur, and (2) leaching the sulfur from the catalyst with liquid anhydrous ammonia. Over 90 pct of the sulfur adsorbed on activated carbon (the catalyst) was

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  • ISOLATION OF IRON  AND SULFUR OXIDIZING BACTERIA

    ISOLATION OF IRON AND SULFUR OXIDIZING BACTERIA

    isolation of iron and sulfur oxidizing bacteria from mine water in japan and some investigations on the leaching of sulfide ores t adaaki mizoguchi ano t aijiro okabe

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  • Sulfur species behavior in soil organic matter during

    Sulfur species behavior in soil organic matter during

    Sulfur speciation in samples also reflects the loss of mineralized S species and dissolved organic matter because leaching occurred in these samples that underwent decomposition in the solum. Differences in organic S speciation between these samples should incorporate the mineralization of more recalcitrant phases of SOM during pedogenesis.

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  • SOIL NUTRIENT FUNDAMENTALS, COVER CROPS, and

    SOIL NUTRIENT FUNDAMENTALS, COVER CROPS, and

    SOIL NUTRIENT FUNDAMENTALS, COVER CROPS, and LEACHING MSU Soil Fertility Extension Clain Jones clainj@montana.edu 994 6076 Golden Triangle Cropping Seminar

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  • Gene Identification and Substrate Regulation Provide

    Gene Identification and Substrate Regulation Provide

    Feb 01, 20130183;32;The psychrotolerant acidophile Acidithiobacillus ferrivorans has been identified from cold environments and has been shown to use ferrous iron and inorganic sulfur compounds as its energy sources. A bioinformatic evaluation presented in this study suggested that Acidithiobacillus ferrivorans utilized a ferrous iron oxidation pathway similar to that of the related species Acidithiobacillus

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  • Bacterial leaching of ores and other materials

    Bacterial leaching of ores and other materials

    Bacterial leaching of ores and other materials. R. N228;veke, Institut f252;r Mikrobiologie, Technische Universit228;t Braunschweig, Fed. Rep. Germany Summary . In nature sulfidic ores are decayed by weathering under the influence of oxygen and water.

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  • Leaching behavior of oil shale semicoke Sulphur species

    Leaching behavior of oil shale semicoke Sulphur species

    Sulphide, sulphite, thiosulphate, sulphate and total sulphur were analyzed in batch leaching tests and in a percolation test to study sulphur leaching from oil shale semicoke. The results showed

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  • The effect of sulphur species on thiosulphate leaching of

    The effect of sulphur species on thiosulphate leaching of

    However, elemental sulphur could form in the degradation processes of the sulphur species. Clearly, the formation of sulphur layers on gold particles would hinder their dissolution. The passivation effect was observed in the presence of the sulphur species in the leaching tests . With the addition of low levels of the sulphur species, the thiosulphate stabilising effect could dominate, and the overall gold dissolution

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  • Sulfur species behavior in soil organic matter during

    Sulfur species behavior in soil organic matter during

    Sulfur speciation in samples also reflects the loss of mineralized S species and dissolved organic matter because leaching occurred in these samples that underwent decomposition in the solum. Differences in organic S speciation between these samples should incorporate the mineralization of more recalcitrant phases of SOM during pedogenesis.

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