Secondary oxidation pretreatment process for arsenic, sulphur and carbon-containing difficultly treated gold concentrate

A technology of refractory gold and secondary oxidation, which is applied in the direction of improving process efficiency, can solve the problems of robbery carbon substances affecting cyanidation and gold extraction, etc., to achieve strong adaptability of ore, strengthen gold leaching effect, and expand the application of ore. range effect

Inactive Publication Date: 2011-04-13
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of refractory gold concentrate containing arsenic, sulfur and carbon in order to solve the problem that after the above-mentioned multiple refractory gold concentrates containing arsenic, sulfur and carbon are subjected to biological oxidation, the carbonaceous matter in the oxidation slag affects the cyanide extraction of gold. Secondary Oxidation Pretreatment Process for Treating Gold Concentrate

Method used

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  • Secondary oxidation pretreatment process for arsenic, sulphur and carbon-containing difficultly treated gold concentrate

Examples

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specific example

[0030] A refractory gold concentrate, the multi-element analysis of the ore is shown in Table 1.

[0031] Table 1 Multi-element analysis results

[0032] element

Au(g / t)

Ag(g / t)

Cu

Pb

Zn

Fe

S

content(%)

33.08

8.80

0.063

0.046

0.12

15.72

12.99

element

Sb

As

C

CaO

MgO

SiO 2

Al 2 o 3

content(%)

0.05

4.82

2.86

6.31

2.09

37.18

6.32

[0033] The metal minerals in the mine are mainly pyrite and arsenopyrite, the contents of which are 22.04% and 10.79% respectively. The carbonate content in the concentrate is 17.33%. The gold particle size is relatively fine, the gold smaller than 0.01mm accounts for 96.98%, and the gold smaller than 0.005mm accounts for 49.56%. Gold is very closely related to metal sulfides, and mostly occurs in sulfides, accounting for 74.46% of the gold content. The concentrate contains 0.61% org...

Embodiment 1

[0036] Step 1: Concentrate regrinding and drug removal:

[0037] The flotation concentrate is finely ground, and the grinding fineness is less than 0.045mm, and the particle size content is 95%, and the concentration of the pulp is 30% after dense chemical removal, so as to reduce the residual flotation agent in the concentrate;

[0038] Step 2: Biooxidation:

[0039] (1) Concentrate pulping: add biological culture medium 3kg / t and water to the gold concentrate after regrinding and drug removal, and adjust the pulp concentration to 20%;

[0040] (2) Biological oxidation: After the concentrate is mixed, it is fed into the biological oxidation tank. The oxidation system is inoculated with chemoautotrophic bacteria such as Thiobacillus ferrooxidans and Thiobacillus thiooxidans. 1~2, inflating and stirring, dissolved oxygen 3~5mg / l, the concentrated ore is oxidized under the action of microorganisms for 4 days, the secondary oxidation is 2 days, and the total oxidation time is 6 ...

Embodiment 2

[0052] Example 1 was repeated according to the same steps described above, but the difference was that the pH value of the slurry prepared by oxidation slag in the chlorination and oxidation operation was 1.5, which was close to the conditions for performing biological oxidation.

[0053] In Example 2, the removal rate of arsenic after biological oxidation was 77.24%, the removal rate of iron was 67.54%, the removal rate of sulfur was 91.09%, the gold grade in the oxidation residue was 37.76g / t, and the carbon leaching rate was 88.58%, the total gold leaching rate is 91.46% after the biological oxidation slag is chlorinated and oxidized.

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Abstract

The invention discloses a secondary oxidation pretreatment process for arsenic, sulphur and carbon-containing difficultly treated gold concentrate. The process sequentially comprises the following steps of: grinding concentrate again, removing a reagent, performing biological oxidation, chloridizing and oxidizing and cyaniding to leaching gold. In the process, the gold concentrate is oxidized by a biological oxidation process, and oxidizing slag is treated by using hypochlorite, so that the harmful influence of carbonaceous matter on the cyaniding and gold leaching is reduced greatly by chloridizing and oxidizing; and the process can effectively improve gold recovery rate, and is simple and environmental-friendly.

Description

technical field [0001] The invention relates to an oxidation pretreatment process of refractory gold concentrate, in particular to a secondary oxidation pretreatment process of biological oxidation-chlorination oxidation treatment of refractory gold concentrate containing arsenic, sulfur and carbon. Background technique [0002] For refractory gold ores containing arsenic and sulfur, biological oxidation is an economical, environmentally friendly and technologically mature advanced pretreatment process. In the process of biological oxidation, bacteria oxidize and decompose gold-coated pyrite, arsenopyrite and other sulfide ores under acidic conditions. The oxidized sulfide ores enter the solution in an ion state and can be neutralized by adding lime to form a stable, non-toxic Contaminated precipitates, while gold remains in the oxidized slag in a naked state, which is easy to be further extracted by cyanide leaching. Compared with gold ore pretreatment processes such as ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C22B3/18
CPCY02P10/20
Inventor 邢志军赵俊蔚赵国惠张雨薛丽贤刘文波
Owner CHANGCHUN GOLD RES INST
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