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Oxidation pretreatment method for strengthening arsenic containing gold concentrates through cooperation of oxidizing agent and catalyst

A gold concentrate and oxidant technology, applied in the direction of improving process efficiency, etc., can solve the problems of reduced biological oxidation rate, toxic arsenic ions, etc., achieve the effects of reducing inhibition, fast reaction rate, and improving oxidation effect

Inactive Publication Date: 2016-08-31
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Arsenic ions are toxic and can inhibit the activity of bacteria, and As 3+ Ions are much more toxic to bacteria than As 5+ ions, so when the content of arsenic in the gold concentrate is high, the biological oxidation of As in the slurry solution 3+ High ion concentration, which will inhibit the activity of bacteria, thereby reducing or even stopping the rate of biological oxidation

Method used

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  • Oxidation pretreatment method for strengthening arsenic containing gold concentrates through cooperation of oxidizing agent and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Grinding and grading operations

[0028] The gold concentrate with arsenic content of 13.52% and gold grade of 80g / t is ground and graded so that the ore particle size is less than 320 mesh and 90%. The gold concentrate after grinding and grading is washed twice with water and adjusted slurry, so that the gold concentrate slurry concentration is 45%;

[0029] (2) Biological oxidation operation:

[0030] Add culture medium to the ore slurry containing 1kg gold concentrate that step (1) makes, the medium consumption is to add 3kg for every ton of gold concentrate, and add water to adjust the slurry concentration to 16%; be 98% concentrated sulfuric acid adjustment with concentration When the pH value of the gold concentrate reaches 2.0, feed it into the biological oxidation system for biological oxidation, stir and oxidize for 6 days, keep the dissolved oxygen in the solution at 4mg / l, and control the reaction temperature at 40°C. Add Oxidant hydrogen peroxide 8g, c...

Embodiment 2

[0035] (1) Grinding and grading operations

[0036]The high-arsenic gold concentrate with arsenic content of 17.34% and gold grade of 93g / t is ground and graded so that the ore particle size is less than 320 mesh and 85%. The gold concentrate after grinding and grading is washed twice with water Slurry adjustment is carried out so that the concentration of the gold concentrate slurry is 35%.

[0037] (2) Biological oxidation operation:

[0038] Add culture medium to the slurry containing 1kg of gold concentrate prepared in step (1), the amount of medium is to add 5kg per ton of gold concentrate, and add water to adjust the concentration of the slurry to 12%; it is 98% concentrated sulfuric acid to adjust The pH value of the gold concentrate reaches 1.8, and it is fed into the biological oxidation system for biological oxidation. It is stirred and oxidized under air-filled conditions for 4 days. The dissolved oxygen in the solution is kept at 4.8mg / l, and the reaction temperat...

Embodiment 3

[0043] (1) Grinding and grading operations

[0044] The high-arsenic gold concentrate with arsenic content of 8.11% and gold grade of 20g / t is ground and classified so that the ore particle size is less than 320 mesh and 95%. The gold concentrate after grinding and grading is washed twice with water Slurry adjustment is carried out so that the concentration of the gold concentrate slurry is 40%.

[0045] (2) Biological oxidation operation:

[0046] Add culture medium to the ore slurry containing 1kg gold concentrate that step (1) makes, the medium consumption is to add 2kg for every ton of gold concentrate, and add water to adjust the slurry concentration to 25%; be 98% concentrated sulfuric acid adjustment with concentration The pH value of the ore pulp reaches 1.2, and it is fed into the biological oxidation system for biological oxidation. It is stirred and oxidized under air-filled conditions for 8 days. The dissolved oxygen in the solution is kept at 4.5mg / l, and the rea...

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Abstract

The invention relates to an oxidation pretreatment method for strengthening arsenic containing gold concentrates through cooperation of an oxidizing agent and a catalyst, and belongs to the field of pretreatment of gold ore hard to treat. In the biological oxidation process, the proper quantity of the catalyst and the proper quantity of the oxidizing agent are put into biological oxidation ore pulp of a certain concentration, the redox potential of an ore pulp solution can be improved, and metal sulfide in the ore pulp is promoted to be oxidized and dissolved. Along with dissolution of minerals, a large number of Fe2+ and As3+ ions can be generated in the solution, the proper quantity of the catalyst and the proper quantity of the oxidizing agent are added and oxidized with germs to form composite catalytic oxidation Fe2+ ions, the Fe2+ ions are oxidized to generate Fe3+ ions, the As3+ ions are further oxidized through the Fe3+ ions, and therefore the concentration of the As3+ ions in the ore pulp solution is reduced, the inhibition effect of arsenic ions on the germ activity is reduced, and the oxidization effect of the arsenic containing gold concentrates is improved; and after the catalyst and the oxidizing agent are added, the oxidization removal rate of arsenic, iron and sulfur in the biological oxidation process can be remarkably increased.

Description

technical field [0001] The invention belongs to the field of refractory gold ore pretreatment, and in particular relates to a process for synergistically strengthening the biological oxidation pretreatment of gold concentrate with an oxidizer and a catalyst, which is suitable for the treatment of arsenic-containing refractory gold concentrate. Background technique [0002] In recent years, with the rapid development of the gold industry, easy-to-extract gold ore resources are increasingly exhausted, and difficult-to-handle gold ore resources have become the main raw materials for the current and future gold industry. In refractory gold ores, gold exists in pyrite or arsenopyrite in the form of fine particles and packages, and contains organic carbon that is not conducive to leaching. Among them, gold must be effectively extracted through pretreatment methods due to physical wrapping, chemical bonding, and chemical covering film wrapping. [0003] At present, the pretreatmen...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B1/00C22B11/00
CPCC22B1/00C22B3/18C22B11/04Y02P10/20
Inventor 张世镖郑晔郝福来赵俊蔚徐祥彬李健赵国惠
Owner CHANGCHUN GOLD RES INST
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