US5948375A - Biological oxidation of sulphide minerals to,

US5948375A - Biological oxidation of sulphide minerals to,

A process for treating gold bearing sulphide minerals wherein the minerals are subjected to biological oxidation, the product thereof is separated into light and heavy fractions and gold is recovered from the light fraction using a non-biological process.Biological Oxidation Of Sulphides In Gold Ore,Biological Oxidation Of Sulphides In Gold Ore. This shows that the ore is a sulfide refractory gold ore , chloridehypochlorite oxidation and leaching of refractory sulfide gold concentrate 65 fig 3.Cid 102105 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological.More on gold prospecting sulphides and gold.Biological oxidation of sulphide minerals to recover gold,,This invention relates to the oxidation of sulphide minerals, including the recovery of gold from sulphide minerals, by means of biological oxidation. Biological oxidation of sulphide ores, especially pyritic gold ores, has been known for some time and there are many references in the literature to ore processing in this way.Biooxidation of Refractory Gold Ores (The Geobiotics,,As free-milling oxide deposits are depleted on a world-wide scale, the mining companies capable of efficiently mining and processing both low- and high-grade refractory sulfide deposits will become industry leaders. This chapter addresses a new process for the biooxidation of refractory gold ores developed by GeoBiotics, Inc.biological oxidation of sulphides in gold ore,Product Supply Information Home / Crusher / Equipment / biological oxidation of sulphides in gold ore biological oxidation of sulphides in gold ore. Mineral bio-processing: an option for recovering, - prometia Technology based on the oxidative dissolution of sulfide minerals by,PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE,Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.Oxidative Hydrometallurgy of Sulphide Minerals,The oxidation of sulfide ores by ozone can occur by dissolution of sulfide species and the formation sulfate ion, as suggested by Elorza et al. Then, the global reaction of the pyrite oxidation in the presence of ozone can be described as follows: FeS2 + 2/3O 3 + 5/2O 2 + H 2O = Fe 2+ + 2SO 42-+ 2H + (14)17 - Flotation of Gold Ores,oxidized deposits (heap leach), low-grade sulphide ores (cyanidation, CIP, CIL) and refractory gold ores (autoclave, biological decomposition followed by cyanidation). 3. A combination of pyrometallurgical (roasting) and hydrometallurgical route is used for highly refractory gold ores (carbonaceous sulphides, arsenical gold ores) and theBiological oxidation of iron sulfides - ScienceDirect,Jan 01, 2019· The biological oxidation of minerals and ores, called bioleaching, has been studied for the last decades to solubilize metals and recover them. In particular, iron sulfides are the most studied ores for an optimum extraction of different metals, such as copper or zinc.Recovery of Gold in Pyritic Sulfide Ores - Mine Engineer.Com,Recovery of gold in sulfide ores has fallen into several categories. First is froth flotation, and second is cyanidation of the ores. 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,

US5948375A - Biological oxidation of sulphide minerals to,

US5948375A - Biological oxidation of sulphide minerals to,

A process for treating gold bearing sulphide minerals wherein the minerals are subjected to biological oxidation, the product thereof is separated into light and heavy fractions and gold is recovered from the light fraction using a non-biological process.Biological oxidation of sulphide minerals to recover gold,,This invention relates to the oxidation of sulphide minerals, including the recovery of gold from sulphide minerals, by means of biological oxidation. Biological oxidation of sulphide ores, especially pyritic gold ores, has been known for some time and there are many references in the literature to ore processing in this way.PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE,Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.Effect of Pretreatment of Sulfide Refractory Concentrate,,For extraction of gold from refractory ores or concen- trate, in which gold is surrounded or covered by iron sul- fide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution. Pyrometallurgi- cal oxidation by roasting is under environmental restric-Biooxidation - BioMineWiki,"In refractory ores, small particles of gold are covered by insoluble sulfides impeding the contact between cyanide and gold. In this case, a pretreatment stage must be considered, such as pressure oxidation , chemical oxidation , roasting or bio-oxidation, the latter currently being the alternative ofOxidative Hydrometallurgy of Sulphide Minerals,The oxidation of sulfide ores by ozone can occur by dissolution of sulfide species and the formation sulfate ion, as suggested by Elorza et al. Then, the global reaction of the pyrite oxidation in the presence of ozone can be described as follows: FeS2 + 2/3O 3 + 5/2O 2 + H 2O = Fe 2+ + 2SO 42-+ 2H + (14)Atmospheric alkaline pre-oxidation of refractory sulphide,,Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three,Biological oxidation of iron sulfides - ScienceDirect,Jan 01, 2019· The biological oxidation of minerals and ores, called bioleaching, has been studied for the last decades to solubilize metals and recover them. In particular, iron sulfides are the most studied ores for an optimum extraction of different metals, such as copper or zinc.(PDF) Bacterial Leaching as a Pre-treatment Step for Gold,,A gold concentrate containing >100 g/t gold was obtained at optimum conditions, from an ore containing < 2 g/t gold i. e., 10 ml bacterial dose, 6 days retention time, and 6.5 kg/t K 2SO 4 as,Recovery of Gold in Pyritic Sulfide Ores - Mine Engineer.Com,Recovery of gold in sulfide ores has fallen into several categories. First is froth flotation, and second is cyanidation of the ores. 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,

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores

sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore (15). Alkaline pressure oxidation yields a residue composed primarily of iron oxide, which is environmentally safe and compatible with the cyanidation process.Pretreatment Process on Refractory Gold Ores with As,Electrochemical oxidation 28) uses electrodereaction to oxidize gold ore bearing arsenide and sulfide in a certain media. The dielectric system contains vitriol, nitric acid and hydro-chloric acid, etc. The result of reaction is similar to pressure oxidation. The process can change microstructure of refractory gold ore to improve porosity of ore.Understanding the heap biooxidation of sulfidic refractory,,An investigation has been conducted into the nature and rates of the physical, chemical, biological, and thermal processes involved in the heap biooxidation of pyrite from refractory gold ores. A heap-scale model of the ideal process was developed, aided by a systematic experimental approach, which accounts for the following phenomena. Grain-Scale Kinetics - The thermal and chemical,(PDF) Two-stage combined biological and chemical leaching,,A sulphide ore containing 4.1 g/t gold and 17.0 g/t silvere most of which finely disseminated in pyrite, was subjected to two-stage processing for extracting these precious metals.US5948375A - Biological oxidation of sulphide minerals to,,A process for treating gold bearing sulphide minerals wherein the minerals are subjected to biological oxidation, the product thereof is separated into light and heavy fractions and gold is recovered from the light fraction using a non-biological process.Biological oxidation of sulphide minerals to recover gold,,This invention relates to the oxidation of sulphide minerals, including the recovery of gold from sulphide minerals, by means of biological oxidation. Biological oxidation of sulphide ores, especially pyritic gold ores, has been known for some time and there are many references in the literature to ore processing in this way.Biooxidation of gold-bearing sulfide ore and subsequent,,Jul 27, 2016· The percolation biooxidation parameters of ore from the Bakyrchik deposit were studied. An investigation of the technological parameters (such as the concentration of leaching agents, irrigation intensity, and pauses at various stages of the leaching) revealed the optimal mode for precious metal extraction. The stages of the ore processing were biooxidation, gold extraction by cyanidation or,Bacterial Oxidation of Refractory Sulfide Ores for Gold,,AbstractThe microbiological leaching of refractory sulfide ores (pyrite, arsenopyrite) for recovery of gold is reviewed in this article. The underlying physiological, biochemical, and genetic fundamentals of the bacteria involved (Thiobacillus and Sulfolobus spp.) are complex and have yet to be elucidated in depth. The chemistry of acid and biological leaching of pyrite and arsenopyrite,“Boroo Gold ” LLC The Project of BIOX® Plant to Process,,1.2.3.Biological oxidation BIOX® technology, experiment and technological, metal processors is biological oxidation technology of sulfide ore and this technology is, The purpose of the project is to recover 986,000 ounce of gold by oxidizing sulfide in sulfide and transition oreEffect of Pretreatment of Sulfide Refractory Concentrate,,For extraction of gold from refractory ores or concen- trate, in which gold is surrounded or covered by iron sul- fide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution. Pyrometallurgi- cal oxidation by roasting is under environmental restric-

Biooxidation - BioMineWiki

Biooxidation - BioMineWiki

"In refractory ores, small particles of gold are covered by insoluble sulfides impeding the contact between cyanide and gold. In this case, a pretreatment stage must be considered, such as pressure oxidation , chemical oxidation , roasting or bio-oxidation, the latter currently being the alternative ofOxidative Hydrometallurgy of Sulphide Minerals,The oxidation of sulfide ores by ozone can occur by dissolution of sulfide species and the formation sulfate ion, as suggested by Elorza et al. Then, the global reaction of the pyrite oxidation in the presence of ozone can be described as follows: FeS2 + 2/3O 3 + 5/2O 2 + H 2O = Fe 2+ + 2SO 42-+ 2H + (14)Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores,sulfide ores and was used commercially for treating a cobalt-nickel arsenic ore (14). Alkaline pressure oxidation was also used to treat high-acid-consuming mercury gold ore (15). Alkaline pressure oxidation yields a residue composed primarily of iron oxide, which is environmentally safe and compatible with the cyanidation process.Atmospheric alkaline pre-oxidation of refractory sulphide,,Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three,Pretreatment Process on Refractory Gold Ores with As,Electrochemical oxidation 28) uses electrodereaction to oxidize gold ore bearing arsenide and sulfide in a certain media. The dielectric system contains vitriol, nitric acid and hydro-chloric acid, etc. The result of reaction is similar to pressure oxidation. The process can change microstructure of refractory gold ore to improve porosity of ore.Ore genesis - Wikipedia,Ore deposits formed by lateral secretion are formed by metamorphic reactions during shearing, which liberate mineral constituents such as quartz, sulfides, gold, carbonates, and oxides from deforming rocks, and focus these constituents into zones of reduced pressure or dilation such as faults. This may occur without much hydrothermal fluid flow,Understanding the heap biooxidation of sulfidic refractory,,An investigation has been conducted into the nature and rates of the physical, chemical, biological, and thermal processes involved in the heap biooxidation of pyrite from refractory gold ores. A heap-scale model of the ideal process was developed, aided by a systematic experimental approach, which accounts for the following phenomena. Grain-Scale Kinetics - The thermal and chemical,Microbial oxidation of gold ores and gold bioleaching,,Much recent work in the field of biohydrometallurgy has been directed to the study of bio-oxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms. This work has been done worldwide and has resulted in several pilot plant and commercial scale operations for gold ore bio-oxidation.,,