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the bioleaching and processing of refractory gol

The bioleaching and processing of refractory gold ore

Apr 01, 1997· Technological advances have taken biooxidation from a concept to commercial reality. The understanding and funding of bench, pilot, and full-scale programs is steadily increasing. Today, biooxidation technology is successful in a range of conditions, from ideal to the most severe climates in the world. Because of this flexibility, biooxidation can be effectively integrated into gold-processing

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Bioleaching Refractory Gold

Bacterial leaching is an alternative technology for the pre-treatment of refractory pyrite and arsenopyrite gold ores and concentrates. These materials are usually bioleached as mineral pulps, and the process is conducted in stirred tanks (STR) or Pachuca reactors. Efficient performance in this type of reactors depends upon reaching high rates of oxygen transfer into solution while keeping

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Bioleaching Refractory Gold Ore

Bacterial extraction of gold from sulfide bearing ores has been studied by many investigators. If gold occurs finely disseminated within the sulfide ore matrix such as in pyrite, arsenopyrite and pyrrhotite, the leachant can not penetrate into the inside of solid ore in order to leach the enclosed submicron size gold particles. For their liberation, the sulfide bearing ore is subjected to

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Bioleaching of Gold Ore Essay 3062 Words

Bioleaching has been applied to copper and uranium deposits for many years, but more recently has been applied to gold ore refractory and refractory concentrates. This process involves the oxidation of sulfide, ferrous, and sometimes carbon containing minerals in order to liberate the gold trapped within.

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Heap Bioleaching of Refractory Arsenic Gold Concentrates

A novel fluidized-bed reactor was designed and installed for bioleaching in a semi-continuous way, by which a process for bioleaching-cyanidation of Jinya refractory gold arsenical concentrate was

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Technology — BacTech

Bioleaching provides additional mine life of three years processing refractory arsenic gold concentrates from the mine. The mine was closed in 1997 due to low gold prices, but BacTech had its first successful commercial application.

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Effect of Temperature on Column Bioleaching of a

Low-grade, finely disseminated refractory sulfide gold ores associated with high arsenic are ubiquitous resources all over the world. Since heap bio-oxidation is an economic and promising biotechnology to recover gold, low grade, high organic carbon and arsenic bearing gold ores from Zhesang Mines in China were chosen for this purpose to study the key factors that would affect biooxidation.

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Microbial Leaching (Bioleaching, Biomining

Gold and Silver Leaching Today's microbial leaching of refractory precious metal ores to enhancegold and silver recovery is one of the most promising applications. Gold is obtained through bioleaching of arsenopyrite/pyrite ore and its cyanidation process. Silver is more readily solubilized than gold during microbial leaching of iron sulfide.

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(PDF) Bioleaching: A microbial process of metal recovery

Bioleaching/minerals biooxidation and bioremediation have been widely used commercially for heap/dump bioleaching of secondary copper sulfide ores, sulfidic-refractory gold concentrates and

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Bioleaching Refractory Gold Ore

Bacterial extraction of gold from sulfide bearing ores has been studied by many investigators. If gold occurs finely disseminated within the sulfide ore matrix such as in pyrite, arsenopyrite and pyrrhotite, the leachant can not penetrate into the inside of solid ore in order to leach the enclosed submicron size gold particles. For their liberation, the sulfide bearing ore is subjected to

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Column Bioleaching of Refractory Gold Ores Scientific.Net

Refractory sulfide ores are ubiquitous resources of gold around the world. It was demonstrated that biooxidation pretreatment of refractory whole ores could be conducted in heaps. The effectiveness of column biooxidation of off-balance gold ores from Bakyrchik and Bolshevik deposits (northeast Kazakhstan) containing pyrite and arsenopyrite was examined in the laboratory.

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Design of a reactor bioleach process for refractory gold

Jul 01, 1993· Abstract. CRA has been developing bioleaching for the treatment of low-grade refractory gold resources. In lhe course of dcveloping a biolcach process for a pyrite concentrate at Bougainville Copper Limited (BCL), CRA has confronted the myriad of problems associated with proving a concept at a small scale, to the design of a conceptual flowsheet.

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Effect of Temperature on Column Bioleaching of a

Low-grade, finely disseminated refractory sulfide gold ores associated with high arsenic are ubiquitous resources all over the world. Since heap bio-oxidation is an economic and promising biotechnology to recover gold, low grade, high organic carbon and arsenic bearing gold ores from Zhesang Mines in China were chosen for this purpose to study the key factors that would affect biooxidation.

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Treatment of carbonaceous refractory gold ores ScienceDirect

Underlying the difficulty of processing refractory gold ores is their mineralogy. This type of ore may have, (1) gold in intimate association with and locked in sulphide minerals, (2) gold associated with carbonaceous matter capable of adsorbing aurocyanide and (3) gold in solid solution with other minerals.

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Bioleaching: Introduction, Methods, Application, Copper

Microbial leaching of refractory precious metal ores to enhance recovery of gold and silver is one of the most promising applications. Gold is obtained through bioleaching of arsenopyrite/pyrite ore and its cyanidation process. Silver is more readily solubilized than gold during microbial leaching of

More

Microbial Leaching (Bioleaching, Biomining

Gold and Silver Leaching Today's microbial leaching of refractory precious metal ores to enhancegold and silver recovery is one of the most promising applications. Gold is obtained through bioleaching of arsenopyrite/pyrite ore and its cyanidation process. Silver is more readily solubilized than gold during microbial leaching of iron sulfide.

More

Reverse osmosis removal of arsenic residues from

Mar 01, 2008· Fig. 2 shows a generalised flowsheet for treating refractory gold sulphide concentrate. It includes bioleaching of iron/arsenic sulphide concentrate to liberate gold and carbon-in-pulp cyanidation to recover gold (Gupta and Mukherjee, 1990b).Residues are disposed to two sedimentation pond or thickener systems, one for bioleaching and one for cyanidation, and may then be considered for re

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(PDF) Bioleaching: A microbial process of metal recovery

Bioleaching/minerals biooxidation and bioremediation have been widely used commercially for heap/dump bioleaching of secondary copper sulfide ores, sulfidic-refractory gold concentrates and

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Bioleaching Process Mining Fundamentals

Bioleaching is performed mostly by iron and sulfide oxidizing bacteria, or acid producing fungus. Some of the types of bacteria used in this process include Leptospirillum ferrooxidans, Thiobacillus ferrooxidans, and some species of sulfolobus, acidianus, and sulfobacillus.

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Arsenic bioleaching in medical realgar ore and arsenic

leachates during bioleaching of gold concentrates and ores, especially in that of arsenic-bearing refractory gold ore. Although, realgar and arsenic-bearing refractory gold ore are usually involved in two different fields, there is an identical that arsenic leaching ratio that constitutes a crucial factor in their

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GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS: II

BIOLEACHING AND PROCESSING OF A REFRACTORY GOLD ORE: N.S. Lynn, Lyntek, Inc., 775 Mariposa Street, Denver, CO 80204 A new process has been developed to bioleach refractory gold ores to expose the precious metal values using Thiobacillus ferrooxidans bacteria.

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Refractory Gold Mining SGS

SGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum flowsheet for a particular ore. Our gold metallurgy expertise is second to none. Chemical interference. There are two important mechanisms by which gold recovery is limited through chemical interference.

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The BIOX® Process for Biooxidation of Gold-Bearing Ores or

Abstract. GENCOR S.A. Ltd. has pioneered the commercialization of biooxidation of refractory gold ores. Development of the BIOX ® process started in the late 197os at GENCOR Process Research, in Johannesburg, South Africa. The early work was championed by Eric Livesey-Goldblatt, the manager of GENCOR Process Research who directed pioneering and innovative research into bacterial oxidation

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