bioleaching of gold concentrates

Mar 01, · 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-use in cemented products ( Bouzalakos et

20.07.  · Example of bioleaching of sulfidic gold concentrates, that the discharge from the final stage is subjected to water washing and solid/liquid separation in thickeners. Even though there is less power consumption basically used for agitator and blower, it has linear relationship with the amount of sulfide -sulfure which is required to oxidize and recover the target metal from the parent ore

The bioleaching of chalcopyrite ores and concentrates, and more efficient bioleaching of refractory gold concentrates, are two such applications. By around 1986, the emphasis of Mintek's research work began to shift towards the agitated tank bioleaching of refractory gold concentrates.

The Mondo operation is the first commercial application of the Mintek technology and the world’s first nickel sulphide concentrate bioleach plant. The flowsheet involves magnetic separation, flotation and regrinding, resulting in a bioleaching feed containing about 10% Ni.

The plant was designed for treating gold and silver bearing concentrates, but it can be used for the bioleaching of copper, zinc, nickel and other base-metal concentrates (Anonymous, 2002c). Another ongoing project is a heap bioleaching plant to treat zinc sulphide concentrates that is being developed in the Kumba s Rosh Pinah mine in Namibia

A sample of pyritic gold concentrate was used in the bioleaching experiments. The sample was 95 % between 70 and 400 Tyler Mesh. An iron free basal medium with the following composition was used for incubation and leaching experiments: 0.4 g/l (NH4)2SO4H2O, 0.4 g/L MgSO4H2O

bioleaching as a technique to eliminate arsenic in high-value minerals such as gold concentrates. However, there is no reported work on arsenic elimination or reduction in minerals of low value such as lead. This work is aimed to reduce the arsenic content in com-plex concentrates of galena and to generate preliminary

The free gold that remains undissolved is separated by means of gravity separation methods. After gravity separation, additional comminution is carried out, after which the sulphide minerals are decomposed and the gold-containing solution or residue is routed to the concentrate leaching circuit.

After bioleaching, the gold recovery of the oxidation residue was 98.02 % with the cyanidation method, which was showed the biological pretreatment was applicable to the complex refractory gold ore.

Many studies on mutation breeding of bioleaching bac-teria have been done all over the world, but few focused on the bacteria for arsenic-rich gold concentrates bioleaching [ , ]. In this paper, the bacterial ora enriched in acid mine drainage of Dexing copper mine, Jiangxi Province, China, was used to be mutated and for arsenic-rich gold concentrates bioleaching. UV, ultrasonic, and microwave

01.09.2001 · 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