oxidative leaching of sulfide ores with the ... - Ore Dressing

was devoted to review and discuss the historical perspective of the oxidative leaching of chalcopyrite, ... oxidation rates. It was also postulated that the actual. OXIDATIVE LEACHING OF SULFIDE ORES WITH THE PARTICIPATION OF. NITROGEN SPECIES-A REVIEW .... pyrite concentrate may contain about 26% copper,.

The Recovery of Copper in Sulphide Ores by Roasting, Leaching ...

Greenough, Jack S., "The Recovery of Copper in Sulphide Ores by Roasting, Leaching, and Electrolysis" (1932). Bachelors Theses and. Reports ... ean be obtained if the copper ore is in the oxidized condition. The problem is to convert ... The iron in the copper sulphide ores is present as pyrite, or in combinations as bornite,...

WO2013163712A1 - Sulfide ore leaching process - Google Patents

This present invention refers to a process for leaching sulfide ores and, particularly, to a process for leaching chalcopyrite ore for recovering copper. DESCRIPTION OF THE .... The iron oxidation reaction can be supplemented with sulfur or pyrite to provide additional acid (Equations 4 and 5, Table 1). Importantly, the...

bacterial leaching of sulfide ores - Geologian tutkimuskeskus

dissolved femc iron, The disulfide entity of pyrite was completely oxidized to sulfate. Under comparable conditions, the initial disintegration of pyrrhotite was non-oxidative. Dissolved sulfide was oxidized to a metastable elemental sulfur residue, which was subsequently oxidized to sulfate. Under certain condi tion s, copper...

Effect of Pretreatment on Leaching Primary Copper Sulfide in ... - MDPI

Dec 21, 2017 ... effect on copper dissolution from primary copper sulfide ore in an acid-chloride medium. It also provides a feasible alternative for treating primary copper sulfide ores at the industrial level. Keywords: chalcopyrite; chloride; leaching; pretreatment; seawater. 1. Introduction. Due to depletion of oxidized copper...

LEACHING OF LOW-GRADE COPPER ORES - CEON-a

Dec 14, 2016 ... pyrite. Therefore, pyrite, which is always present in the ore deposits of copper, is an important mineral, as its oxidation supplies leaching solution with ferric sulphate and partly sulphuric acid [10, 11]. Mine development and exploitation of sulphide mineral deposits, as is the case at. RTB Bor, imply the...

Two-dimensional dynamic model of a copper sulphide ore bed

Ferrous minerals are present as a product of pyrite oxidation. The ferric ions, in turn, oxidise the copper sulphides. At present, copper leaching is also applied to high-grade copper ores due to its competitive cost. The bioleaching rate is determined by the slowest of the following four steps: (1) the supply of oxygen to the bed...

Arsenic Pyrite Gold Extraction by Alkaline Leaching Oxidation

Jul 22, 2017 ... High temperatures (170° to 190° C) and pressures (up to 400 psig O2) are required to achieve complete oxidation of the sulfide minerals. The chemistry of these reactions is complex. The dissolved arsenate precipitates as scorodite (FeAsO4 · 2H2O) and reports to a jarosite-bearing leach residue. However...

Gold Metallurgy & Leaching in Cyanicides - 911 Metallurgist

Mar 17, 2017 ... Gold Leaching with Copper Minerals present ... Leaching Gold with Zinc Minerals in Ore; How Lead Minerals Affect Gold Leaching & Recovery ... While the oxidized iron minerals ordinarily have little effect in cyanidation, the sulphides—pyrite, marcasite and pyrrhotite—tend to decompose in cyanide...

Treatment of Mixed Sulfide Oxide Ores of Copper - 911 Metallurgist

An incomplete list of processes and patents mentions at least 20 solvents, simple and complex, which are proposed as leaching agents. ... Under proper temperature control, a mixed ore containing sufficient sulfides, or one to which pyrite has been added, can be...

Bioleaching - Wikipedia

For example, bacteria catalyse the breakdown of the mineral pyrite (FeS2) by oxidising the sulfur and metal (in this case ferrous iron, (Fe2+)) using oxygen. This yields soluble products that can be further purified and refined to yield the desired metal. Pyrite leaching (FeS2): In the first step, disulfide is spontaneously oxidized...

Cu Leaching Using Regenerated Ferric Sulphate - SGS

Secondary copper minerals such as chalcocite (Cu2S) and covellite (CuS) are known to dissolve in acidic ferric sulphate solutions. However, the quantities of ferric ... called the “Regenerated Ferric Sulphate Leaching (RFSL) process, in which the reoxidation of the ferrous ion is ..... evidence that pyrite oxidation by ferric.

Acid Pressure Leach Process for Copper Removal - J-Stage

of molybdenite and iron (hydro-) oxide can be treated by means of flotation or oxygen pressure leaching in alkaline media to extract molybdenum and rhenium values. KEY WORDS'Chalcopyrite, Pyrite, Sulfide Mineral Oxidation, Autoclave Leaching. 1. Introduction. Copper porphyry ore containing from several tens to a few.

Treatment of Sulfide Minerals by Oxidative Leaching with Ozone ...

Jan 4, 2018 ... On the other hand, some sulfides such as pyrite are considered as one of the major impurities in solid fossil fuels such as coal. Oxidation of these ... sulfur by leaching. This work summarizes the results obtained regarding the use of ozone in the oxidation of sulfide ores containing gold, silver, and copper.

Treatment of Sulfide Minerals by Oxidative Leaching with Ozone ...

On the other hand, some sulfides such as pyrite are considered as one of the major impurities in solid fossil fuels such as coal. Oxidation of these sulfides ... to remove sulfur by leaching. This work summarizes the results obtained regarding the use of ozone in the oxidation of sulfide ores containing gold, silver, and copper.

Advances in high-temperature heap leaching of refractory copper ...

Heap leaching has also been extended to the treatment of secondary sulphide copper ores, where oxidative conditions are generated in aerated heaps by the .... If the ore contains sufficient pyrite, bacterial oxidation of the pyrite generates heat exothermically, and by manipulation of aeration and irrigation rates the retention...

Exploitation of Bacterial Activities in Mineral Industry and ... - Hindawi

Nov 4, 2013 ... Ferric sulfate is obtained by metabolic oxidation of pyrite, which is always present in the uranium ores. Bioleaching of copper and uranium ores by heap leaching resulted in substantial saving in the production costs. Bioleaching of zinc sulfide concentrates using bacteria has been investigated [16, 51].

Bioleaching reaction - BioMineWiki

May 13, 2008 ... Some of the best known bioleaching reactions include when metal is released from sulfide minerals by Fe3+ oxidation of the metal sulfide bond and is catalyzed by acidophilic iron oxidizing microorganisms that ... In bioleaching of pyrite there is an initial chemical leaching where Fe3+ oxidises the mineral:.

evaluating process options for treating some refractory ores abstract

leaching to the aggressive conditions found in pressure oxidation. The gold and sulphur ( ... The high throughput ore B comprise predominantly of pyrite and small copper sulphide minerals as the main gold carriers .... Most refractory gold ores and sulphide concentrates require some degree of oxidation of the sulphides to...

metal sulfide leaching potential in the duluth gabbro complex

dump leaching solution. 8~. Comparative characteristics of Thiobacilli~. 9. Copper extraction from copper sulfide minerals by bacterial oxidation. 10. Chemical ..... pyrite: [FeS. 2. ] bornite: [Cu. S. FeS. 4. ] troilite: [FeS] mackinalyute: [FeS] oxide minerals vallerlite: [CuFeS:Mg,Al,Fe(OH)2] sphalerite: [(Zn,Fe)S] violarite: [(Ni...

Recovery of Gold In Pyrite Ores - Mine Engineer

Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores. Perhaps there is some room here for...

Limited role of sessile acidophiles in pyrite oxidation below ... - Nature

study demonstrates that sessile microbes play a limited role in pyrite oxidation at a redox potential ... Pyrite (FeS2) is the most abundant sulfide mineral on earth and is found in most mining environments. ..... Why Zijinshan copper bioheapleaching plant works efficiently at low microbial activity – Study on leaching kinetics.

Recovery of Copper from Copper Sulfide Concentrate by Sulfation ...

Feb 11, 2015 ... process becomes the most viable and promising approach to treat copper sulfide ore in metallurgy fields. In hy- drometallurgical process, the most widely used pretreatment process is roasting before leaching. There are three common roasting methods: oxidation roasting, chlorination roasting and sulfation...

Pyrite Leaching Behaviour under CESL Process Conditions H ... - Teck

Pyrite merits attention because, unlike most other sulphide minerals, it reacts in the CESL leaching step to ... the roles of particle size, oxygen partial pressure, pulp density and copper (Cu) addition on the kinetics of pyrite ... The CESL Copper Process typically comprises the steps of concentrate regrinding, the oxidation of.

8 Microbial Leaching of Metals - Wiley-VCH

6.1 Commercial-Scale Copper Ore Bioleaching 208. 6.2 Reactor Bioleaching of ... In the case of copper, copper sulfide is microbially oxidized to .... chemical oxidation. T. ferrooxidans, L. ferrooxidans thiobacilli around cells of T. ferrooxidans during growth on synthetic pyrite films (ROJAS et al., 1995). “Footprints” of organic...

Bioelectrochemical Leaching of Copper Sulfide Minerals

22nd International Biohydrometallurgy Symposium: Bioelectrochemical Leaching of Copper Sulfide Minerals. ... From the results of this study, the importance of the oxidation reduction potential (ORP) on the catalytic interaction between chalcopyrite and pyrite can be pointed out as the main parameters for successful...

Advances in high-temperature heap leaching of refractory copper ...

increases. The heap leaching of copper ores is an example of such a trend, where heap leaching was initially applied only to the acid leaching of oxide ores. The most ... treatment of secondary sulphide copper ores, where oxidative conditions are ... simulation of the natural temperature profile development in pyrite-.

PRESSURE OXIDATION OF ENARGITE CONCENTRATES ...

study of pressure oxidation leaching of enargite concentrates, which may be applied to copper sulfide orebodies ... have employed sulfuric acid-oxygen pressure leaching, alkaline sulfide leaching, and roasting. The approach ... leached residues showed higher pyrite content than the feed sample by 6.5-15 weight percent.

modeling of high pressure pretreatment process for gold leaching

Keywords: pretreatment process, pressure oxidation, refractory gold ore and concentrate, leaching, modeling. Investigation of high pressure pretreatment process for ..... Sulphide minerals, such as pyrite and chalcopyrite, are the most important sources .... The iron, arsenic, and copper species are further oxidized to higher.

Enrichment of Mineral Deposits by Weathering—Part II - April 2016 ...

Pyrite is commonly associated with these deposits and the forces of weathering turn the pyrite to sulfuric acid, which readily breaks down the copper minerals. Copper solutions migrate downward through the oxidized zone and into the supergene sulfide zone so that a large degree of concentration can be created.

Enrichment of Mineral Deposits by Weathering—Part II - April 2016 ...

Pyrite is commonly associated with these deposits and the forces of weathering turn the pyrite to sulfuric acid, which readily breaks down the copper minerals. Copper solutions migrate downward through the oxidized zone and into the supergene sulfide zone so that a large degree of concentration can be created.

Release of Heavy Metals from the Pyrite Tailings ... - Semantic Scholar

Jan 20, 2016 ... Huangjiagou pyrite mine, the pyrite tailings were investigated through a series of batch experiments ... be oxidized spontaneously once exposed to air and water [1]. The oxidation of sulfide-rich ...... Chen, T.; Lei, C.; Yan, B.; Xiao, X.M. Metal recovery from the copper sulfide tailing with leaching and fractional...

Chavez Article.4pdf - Erich U. Petersen

Apr 1, 2000 ... The oxidation of sulfide minerals, especially pyrite, is critical in ... oxidation state of a sulfide-bearing mineral deposit because most ore ... available to supply copper via oxidation and leaching. Pyrite is the most significant source of oxidized S and, indirectly, hydrogen ions, in a sulfide-bearing rock volume.

Acid leaching of oxide–sulfide copper ore prior the flotation - doiSerbia

Jul 17, 2014 ... Acid leaching of oxide–sulfide copper ore prior the flotation – A way for an increased metal recovery. Miroslav D. Sokić1, Vladan D. Milošević1, Velizar D. Stanković2, Vladislav Lj. Matković1,. Branislav R. Marković1. 1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia.

Control of Sulfur Dioxide Emissions From Copper Smelters: Volume ...

Suitable copper sulfide- iron sulfide concentrations for matte production are almost universally obtained by depressing the flotation of the excess pyrite and thus reject- ing it to the tailings. It is thus accepted ... In many cases this acid is finding use nearby in expanded leaching operations for low-grade oxidized copper ores.

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores

Sep 5, 1989 ... temperatures ( < 115° C) and pressures ( < 100 psig O2) can be used to effect the oxidation of sulfide minerals. The arseno process involves the use of a catalyst. A pressure oxidation procedure that has gained com- mercial status for treating gold-bearing arsenopyrite or pyrite employs sulfuric acid (H2S04).

The kinetics of pyrite and elemental sulfur reactions during nitric acid ...

The variation in the oxidation rates of both pyrite and elemental sulfur with experimental conditions accounts for ..... The field of this study is the hydrometallurgical processing of refractory gold ores. The major reason ores are ..... Prater et al. tested a range of conditions for nitric acid leaching of copper concentrates. V/hilst of...

How can metal mining impact the environment? | American ...

Most slags, because they are composed primarily of oxidized, glassy material, are not as significant a potential source of metals released into the environment as mine ... Tailings produced from the milling of sulfide ores — primarily copper, lead, and zinc ores — may have concentrations of pyrite that are greater than those...

an investigation of leaching chalcopyrite ore - QSpace - Queen's ...

16 days, was achieved by adding fine pyrite at a 4:1wt ratio with the chalcopyrite content, in a 9.8g/L sulphuric acid solution at 60°C. Flask ... heap-leaches of chalcopyrite ore, the partial oxidation reactions generate insignificant heat to maintain an elevated heap temperature .... 2.3 Heap Leaching of Copper Sulphide Ores .

Rate of Pyrite Bioleaching by Thiobacillus ferrooxidans - PubMed ...

Sep 27, 1990 ... oxidation assist in the commercial recovery of copper and uranium from ores and wastes (3), and microbial leaching has begun to be applied as a pretreatment step in the commercial recovery of gold from sulfidic deposits. In addition, pyrite is the dominant form of inorganic sulfur in coal, and many studies...

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