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Biological oxidation and thiourea resin slurry method gold extraction technology for difficultly leachable gold concentrate

A technology of biological oxidation and thiourea resin, applied in the direction of improving process efficiency

Inactive Publication Date: 2004-11-10
CHANGCHUN GOLD RES INST
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Problems solved by technology

[0002] At present, the conventional biological oxidation process for treating refractory gold concentrate is to extract gold by cyanidation leaching after the gold concentrate is biologically oxidized. Because the biological oxidation is carried out under the condition of a strong acidic medium with a pH value of about 1.5, the oxidation The leaching is carried out under the condition of a strong alkaline medium with a pH value of about 11, so the current process needs to thoroughly elute the acidic solution of the oxidation slag after biological oxidation, and then use a large amount of lime to adjust the pulp to alkaline; It is a highly toxic compound, so the application of cyanide method is restricted by strict environmental protection regulations, and some areas do not allow the application of cyanide method to extract gold, so it is necessary to solve the deficiency of the conventional cyanide method for gold extraction after biological oxidation

Method used

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  • Biological oxidation and thiourea resin slurry method gold extraction technology for difficultly leachable gold concentrate
  • Biological oxidation and thiourea resin slurry method gold extraction technology for difficultly leachable gold concentrate

Examples

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Embodiment 2

[0028] According to attached figure 1 and attached figure 2 , Example 2 is carried out according to several steps in the following order, wherein the concentrate grade is: Au: 86.5g / t; Ag: 39.8g / t; Cu: 0.11%; Pb: 0.07%; Zn: 0.75%; Fe: 29.77%; S: 26.32%; As: 12.65%; C: 0.45%; the gold particle size is fine, and the gold particle size is less than 0.5μm, nearly 60%. These gold mainly occur in pyrite and arsenopyrite. Arsenic fine-grained gold refractory concentrate, without pretreatment, the direct cyanide leaching rate is only 39.1%.

[0029] Step 1 is biological oxidation:

[0030] (1) Concentrate regrinding and drug removal: Concentrate regrinding particle size is less than 0.045μm, and its particle size content reaches 95%;

[0031] (2) Concentrate pulping: after dense drug removal, add biological nutrient base, sulfuric acid and water in proportion, adjust the pulp concentration to 16%, and adjust the pH to 1.6 with sulfuric acid;

[0032] (3) Biological oxidation: Aft...

Embodiment 3

[0045] According to attached figure 1 and attached figure 2 , Example 3 is carried out according to several steps in the following order, wherein the concentrate grade is: Au: 43.1g / t; Ag: 205.0g / t; Cu: 0.043%; Pb: 0.040%, Zn: 0.15%; Fe: 15.52%; S: 15.76%; As: 3.45%; C: 3.85%; the gold particle size is fine, about 90% of the gold particle size is less than 0.5μm, which belongs to the fine and difficult-to-leach gold concentrate, the organic carbon content is 0.12%, and it can be leached directly by cyanide The gold leaching rate is 12.56%;

[0046] Step 1 is biological oxidation:

[0047] (1) Concentrate regrinding and drug removal: Concentrate regrinding particle size is less than 0.045μm particle size content is 98%, magnetic material yield of magnetic separation iron removal is 0.84%;

[0048] (2) Concentrate pulping: after thickening and demedication, add biological nutrient base, sulfuric acid and water in proportion, adjust the pulp concentration to 20%, and pH to 1....

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Abstract

The invention disclose a refractory gold concentrate's biological oxidation---an gold extracting technique by thionura-resin ore pulp method, including the following steps: making biological oxidation of gold concentrate, using thionura to extract gold and using resin to absorb the gold, processing the tail solution and then returning it to the mixing pulp work before extraction for circular use; the gold extraction can reach above 90%, the tail solution is circularly used so as to be able to reduce consumption of thionura, sulphuric acid and water, thus reducing production cost and beneficial to environmental protection.

Description

technical field [0001] The invention relates to a treatment technology of gold concentrate, in particular to a biological oxidation of refractory gold concentrate—a process for extracting gold by thiourea resin pulp method. Background technique [0002] At present, the conventional biological oxidation process for treating refractory gold concentrate is to extract gold by cyanidation leaching after the gold concentrate is biologically oxidized. Because the biological oxidation is carried out under the condition of a strong acidic medium with a pH value of about 1.5, the oxidation The leaching is carried out under the condition of a strong alkaline medium with a pH value of about 11, so the current process needs to thoroughly elute the acidic solution of the oxidation slag after biological oxidation, and then use a large amount of lime to adjust the pulp to alkaline; It is a highly toxic compound, so the application of cyanide method is restricted by strict environmental prot...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/24
CPCY02P10/20
Inventor 李忠山刘春谦张清波金世斌高金昌
Owner CHANGCHUN GOLD RES INST
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