Contact Us

C o n t a c t U s

Bacterial heap leaching of refractory gold/sulphide ores

May 01, 1994 The results are presented in Figure 4, which shows that for the selected consumption, bacterial heap leaching can be more economic than BIOX The choice of process obviously depends on individual ore characteristics, but for refractory sulphide ores, where flotation recovery of gold is below 90 %, the bacterial heap leach process should be

Leachox™ Refractory and Sulphide Gold Process Maelgwyn

The gold is normally present in refractory gold sulphide ores containing mainly pyrite, arsenopyrite or pyrrhotite and occurs in both the chemically bonded state and as micro or nano-size grains of metallic gold. and the bacteria used in bacterial leaching, in tanks or on a heap, are susceptible to changes in environmental conditions and

Commercial heap biooxidation of refractory gold ores

May 15, 2017 Other significant parameters important to operation of biooxidation heaps for refractory gold ore that emerged from these tests included: (a) defining a lower limit for sulfide-S content of 0.2–0.4%, (b) crushing to a smaller particle size is not always better for biooxidation within the heap, particularly with the presence of clays, and (c

Method of gold extraction from sulphide gold-bearing ores

Improving the recovery of precious metals from refractory materials using non-toxic reagents is achieved by the known method of processing sulphide gold-bearing materials, including bacterial opening the source material and the subsequent leaching with a solution of oxygen compounds of sulfur, according to the invention, the leaching is carried

A BACTERIAL HEAP LEACHING APPROACH FOR THE

The application of heap leaching to more refractory chalcopyrite material is still under development. Figure 1 Relationship between ore grade and method of recovery During sulphide heap leaching, bacterial activity can be utilised to catalyse the oxidation of iron, which acts as an electron carrier between the mineral and oxygen for

Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an

Pretreatment Process on Refractory Gold Ores with As

It made pulp density reached 40% even 50%, was applied to refractory gold ore bearing lo-w grade sulfide. A. Mazuelos, etc. have designed a flooded packed bed reactor. 25) The reactor separates bacterial oxidation on Fe +2 from bacteria and ferric iron oxidation on refractory gold ores, and improves the efficiency of bioreactor.

gold refractory,ore classification,preprocessing methods

The most of refractory ore is gold bearing sulfide. Sulfide iron ore includes many kinds of pyrite and arsenopyrite. Ore and sulfide ore are symbiotic closely under submicron particle, we should make the sulfide oxidation by using roasting, pressurized oxidation, bacterial oxidation, chlorination oxidation.

Refractory Gold Ore Treatment Methods

Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and

Bacterial Leaching SGS

Bacterial leaching is an established method of treating refractory gold and base metal ores or concentrates. SGS Minerals Services has undertaken testing for numerous projects for flowsheet • (Heap or thin layer leaching of low grade flotation concentrates)

(PDF) Bacterial Leaching as a Pre-treatment Step for Gold

Maximum bacterial leaching rates of sulfide expose the gold, the ore heap is washed with water to remove acid and metals. Lime is pretreatment methods applied to refractory gold ores

Bacterial Leaching Core Group

> Bacterial Leaching Core has extensive experience in testwork relating to bacterially assisted leaching of base metal sulphide and refractory gold ores. Test programmes carried out have included use of a range of bioreactors for oxidation of concentrates and aerated columns for heap leach simulation studies.

bacterial heap leaching of refractory gold sulphide ores

Pretreatment Process on Refractory Gold Ores with As. Bacterial oxidation process to leach gold is roughly divided into three stages: (1) using bacteria culture medium to cultivate thiobacillus ferroxidans, etc. and preparation for sulfuric acid bacteria leaching solution of Ph=1.5–2.5; (2) bacteria catalyzing, oxidizing and re-moving arsenic and sulfur; (3) the residue from pretreatment

Heap Biooxidation Bioleachingofa Refractory Gold-Bearing Ore

A refractory pyrite/arsenopyrite ore containing 3.7 g/ton of gold finely disseminated in the sulphide matrix was subjected to microbial leaching in a heap containing 120 tons of ore crushed to minus 15 mm. The ore was initially leached by means of acidophilic chemolithotrophic bacteria to oxidize the sulphide minerals and to liberate the gold.

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR

FOR GOLD RECOVERY FROM REFRACTORY ORES In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. There are two methods of bacterial leaching, namely stirred reactor bio-leaching and bio-heap leach processes. The examples of

A BACTERIAL HEAP LEACHING APPROACH FOR THE

The application of heap leaching to more refractory chalcopyrite material is still under development. Figure 1 Relationship between ore grade and method of recovery During sulphide heap leaching, bacterial activity can be utilised to catalyse the oxidation of iron, which acts as an electron carrier between the mineral and oxygen for

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.

Establishing thE ProcEss MinEralogy of gold orEs

refractory carbonaceous sulfide ore is at Barrick’s Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfidic/ carbonaceous ore. These ores are pretreated by autoclave and roaster prior to cyanide leaching (Thomas et al., 2000; Wickens et al., 2003). In the Jinya Carlin-type gold deposit in China, gold

The progression of metallurgical testwork during heap

bacterial heap leaching of low-grade chalcopyrite ores and the acid heap leaching of nickel laterites. A complete programme of heap leach testwork typically involves a sequence of bottle roll tests and column tests, followed by piloting on test heaps. The initial testwork is aimed at determining the amenability of the ore to heap leaching,

Heap Leaching: Is it something that could be an

Nov 29, 2019 Ultimate recovery of the target mineral can range from 30% of contained run-of-mine dump leaching sulfide copper ores to over 90% for the ores that are easiest to leach, some oxide gold ores. The significant advantage of the heap leaching method over conventional leaching and recovery techniques is that heap leaching consumes less than 0.3 ton

ALTA Gold 2012 E-Doc Albion Process

leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring ‘preg robbing’ carbonaceous materials or gold physically ‘locked’ in sulphide minerals. The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides.

Pretreatment Process on Refractory Gold Ores with As

It made pulp density reached 40% even 50%, was applied to refractory gold ore bearing lo-w grade sulfide. A. Mazuelos, etc. have designed a flooded packed bed reactor. 25) The reactor separates bacterial oxidation on Fe +2 from bacteria and ferric iron oxidation on refractory gold ores, and improves the efficiency of bioreactor.

Bioleaching Wikipedia

Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt

bacterial heap leaching of refractory gold sulphide ores

Pretreatment Process on Refractory Gold Ores with As. Bacterial oxidation process to leach gold is roughly divided into three stages: (1) using bacteria culture medium to cultivate thiobacillus ferroxidans, etc. and preparation for sulfuric acid bacteria leaching solution of Ph=1.5–2.5; (2) bacteria catalyzing, oxidizing and re-moving arsenic and sulfur; (3) the residue from pretreatment

Heap Biooxidation Bioleachingofa Refractory Gold-Bearing Ore

A refractory pyrite/arsenopyrite ore containing 3.7 g/ton of gold finely disseminated in the sulphide matrix was subjected to microbial leaching in a heap containing 120 tons of ore crushed to minus 15 mm. The ore was initially leached by means of acidophilic chemolithotrophic bacteria to oxidize the sulphide minerals and to liberate the gold.

US5196052A Bacterial-assisted heap leaching of ores

A bacterial-assisted heap leach process is employed for the solubilization of a metal from a refractory ore containing fines and/or clay wherein at least a portion of the metal is solubilized by the bacterial oxidation of sulfides and the concomitant or sequential dissolution of the metal into a leaching solution. For some metals, the leaching solution has a pH of greater than about 9.

A BACTERIAL HEAP LEACHING APPROACH FOR THE

The application of heap leaching to more refractory chalcopyrite material is still under development. Figure 1 Relationship between ore grade and method of recovery During sulphide heap leaching, bacterial activity can be utilised to catalyse the oxidation of iron, which acts as an electron carrier between the mineral and oxygen for

Heap Leaching: Is it something that could be an

Nov 29, 2019 Ultimate recovery of the target mineral can range from 30% of contained run-of-mine dump leaching sulfide copper ores to over 90% for the ores that are easiest to leach, some oxide gold ores. The significant advantage of the heap leaching method over conventional leaching and recovery techniques is that heap leaching consumes less than 0.3 ton

US4559209A Leaching refractory gold ores Google Patents

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

Pretreatment Process on Refractory Gold Ores with As

It made pulp density reached 40% even 50%, was applied to refractory gold ore bearing lo-w grade sulfide. A. Mazuelos, etc. have designed a flooded packed bed reactor. 25) The reactor separates bacterial oxidation on Fe +2 from bacteria and ferric iron oxidation on refractory gold ores, and improves the efficiency of bioreactor.

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

HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND

techniques, particularly heap leaching, were developed for the treatment of low grade ores. The developments related with gold extraction from pregnant solutions include, carbon-in-pulp, carbon-in-leach processes, the use of resins and solvent extraction techniques. A considerable effort has also been made to treat refractory ores.

Bacterial Leaching

Bacterial Leaching Biotechnology in the Mining Industry Preston Devasia and K A Natarajan Bacterial leaching is the extraction of metals from their ores using microorganisms. Microbial technology offers an eco­ nomic alternative for the mining industry, at a time when high-grade mineral resources are being depleted. Why Bacterial Leaching

The bugs that boost leaching CSIRO

Biooxidation of refractory gold ores in bioreactors. Bio-oxidation can also produce more stable waste products, which reduces the risk to the environment as a result of the mining process. Biohydrometallurgy has the potential to transform uneconomic reserves into viable ventures due to the low cost of allowing microorganisms to do the work.

Heap Bioleaching Pushing the Envelope Draft

Titan have brought the commercialisation of heap bio-leaching for low grade nickel sulphide ores closer, and the Geobiotics and Newmont technologies are likely to accelerate the application of heap bioleaching to refractory gold ores. The future could also see commercialisation of heap bio-leaching technology for other metals

Microbial oxidation of gold ores and gold bioleaching

Microbial pretreatment of refractory sulfide and carbonaceous ores improves the economics of gold recovery. Bacterial oxidation technology — a viable process for refractory gold ores and base metal recovery. Microbial leaching of gold from ores and mineral wastes by means of heterotrophic bacteria

The Leachox™ Refractory Gold Process The Testing, Design

The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold