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Method for leaching Carlin type gold ore through alkaline thiourea

A carlin type, gold mine technology, applied in the field of hydrometallurgy, can solve the problems of complex process and increased cost, and achieve the effect of simple process flow, low pollution, and eliminating the need for pretreatment.

Inactive Publication Date: 2020-04-28
ZHENGYE ENG & INVESTMENT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for leaching Carlin-type gold ore with alkaline thiourea, so as to solve the need for pretreatment of refractory gold ore containing sulfur or arsenopyrite in the prior art; Technical issues such as increased complexity and cost

Method used

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  • Method for leaching Carlin type gold ore through alkaline thiourea
  • Method for leaching Carlin type gold ore through alkaline thiourea
  • Method for leaching Carlin type gold ore through alkaline thiourea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Effect of thiourea concentration on gold leaching:

[0032] Take 50g of Carlin-type gold ore ground to below 200 mesh as a group, a total of 5 groups, add clean glass containers, numbered 1, 2, 3, 4, 5 respectively, add 500 ml of distilled water to make slurry, so that the liquid-solid ratio is 10:1, sequentially add sodium sulfite, potassium persulfate, thiourea, sodium hydroxide, control the concentration of sodium sulfite to 0.1mol / L, the concentration of potassium persulfate to 0.05mol / L, and the concentration of thiourea to 0.01mol / L and 0.05mol / L respectively L, 0.10mol / L, 0.15mol / L, 0.20mol / L, pH=13, stirring and leaching at 25°C for 4 hours, the gold ore leaching rates were 39.6%, 64.2%, 62.7%, 62.3%, 63.1 %.

Embodiment 2

[0034] Effect of sodium sulfite concentration on gold leaching:

[0035] Take 50g of Carlin-type gold ore ground to below 200 mesh as a group, a total of 5 groups, add clean glass containers, numbered 1, 2, 3, 4, 5 respectively, add 500 ml of distilled water to make slurry, so that the liquid-solid ratio is 10:1, add sodium sulfite, potassium persulfate, thiourea, sodium hydroxide successively, control the concentration of sodium sulfite to be 0.05mol / L, 0.1mol / L, 0.15mol / L, 0.20mol / L, 0.25mol / L respectively, over Potassium sulfate concentration is 0.05mol / L, thiourea concentration is 0.10mol / L, pH=13, stirring and leaching at 25°C for 4 hours, the gold ore leaching rates are 37.2%, 66.1%, 68.6%, 67.5%, 64.1%.

Embodiment 3

[0037] Effect of potassium persulfate concentration on gold leaching:

[0038] Take 50g of Carlin-type gold ore ground to below 200 mesh as a group, a total of 5 groups, add clean glass containers, numbered 1, 2, 3, 4, 5 respectively, add 500 ml of distilled water to make slurry, so that the liquid-solid ratio is 10:1, add sodium sulfite, potassium persulfate, thiourea, and sodium hydroxide in sequence, control the concentration of sodium sulfite to 0.15mol / L, and the concentration of potassium persulfate to 0.01mol / L, 0.03mol / L, 0.05mol / L, and 0.07mol respectively / L, 0.1mol / L, thiourea concentration 0.10mol / L, pH=13, stirred and leached at 25°C for 4 hours, the gold ore leaching rates were 56.2%, 65.4%, 69.2%, 72.5%, 71.3%.

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Abstract

The invention discloses a method for leaching Carlin type gold ore through alkaline thiourea. The method comprises the following steps of 1, drying Carlin type gold ore lumps in a drying oven, crushing, grinding, screening to 200 meshes or below, and standing for later use; 2, the thiourea is used as a leaching agent, potassium persulfate is used as an oxidizing agent, sodium sulfite is used as acoordination gold leaching additive, and sodium hydroxide is used as a pH regulator to form an alkaline thiourea gold leaching solution; and 3, putting Carlin type gold ore powder into a glass container, adding the gold leaching solution into the gold ore powder, putting the glass container into a constant-temperature water bath kettle to keep the temperature of the solution at 20 DEG C-50 DEG C,and then carrying out agitation leaching on the Carlin type gold ore through using a mechanical agitation device.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy; in particular, it relates to a method for leaching Carlin-type gold ore with alkaline thiourea. Background technique [0002] The traditional cyanidation gold leaching method has the advantages of simple operation, high gold recovery rate and low production cost, and has been widely used in the gold industry. However, cyanide is highly toxic, leaching gold causes serious environmental pollution, and the production cycle is long. [0003] Gold extraction with thiourea is a new low-toxic gold extraction process that is becoming more and more perfect. It has the characteristics of fast leaching speed, low toxicity, easy regeneration and recovery of chemicals, and little influence from sulfide mineral impurities. It is suitable for gold-bearing mineral raw materials that are difficult to cyanide leaching. , and has good selectivity. Since it was reported in 1941, countries all over the world have carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/12
CPCC22B3/12C22B11/04Y02P10/20
Inventor 陈亮唐道文唐强王锋王勇冷雯昕幸卫鹏
Owner ZHENGYE ENG & INVESTMENT INC
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