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Method for reducing sodium cyanide consumption in gold concentration cyanide leaching process

A technology of cyanide leaching and gold concentrate, which is applied in the field of smelting, can solve the problems of incomplete removal of impurities and achieve the effects of improving recovery rate, reducing consumption and reducing dosage

Active Publication Date: 2019-01-29
ZHAOJIN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the problem of incomplete removal of impurities. Although the consumption of sodium cyanide has been reduced, it is still high. Each ton of gold concentrate needs to consume 7kg-8kg of sodium cyanide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 10 cubic meters of water into the chemical mixing tank, add 4kg of ethylenediaminetetraacetic acid, 1kg of sodium bicarbonate, control the temperature at 19°C, and stir for 5 minutes to obtain a mixed solution. Add 50 tons of 400-mesh gold concentrate to water for Adjust the slurry to obtain a slurry with a mass fraction of 40%, send it to the cyanide leaching tank, add 5 cubic meters of mixed solution, and then add 220kg of sodium cyanide to obtain a mixed slurry. Adjust the temperature in the leaching tank to 19 ° C, and mix the slurry After cyanide leaching, solid-liquid separation is carried out to obtain cyanide tailings and gold-containing liquid respectively.

[0027] Test results: the gold content in the gold concentrate is 50.1g / t, the gold content in the cyanidation tailings is 0.90g / t, the calculated recovery rate of gold cyanide is 98.20%, and the consumption of sodium cyanide is per ton Gold concentrate 4.4kg.

[0028] In the prior art, the gold concen...

Embodiment 2

[0030] Add 5 cubic meters of water into the chemical mixing tank, add 2kg of ethylenediaminetetraacetic acid, 1kg of sodium bicarbonate, control the temperature at 20°C, and stir for 5 minutes to obtain a mixed solution. Add 40 tons of 400-mesh gold concentrate to water for Adjust the slurry to obtain a slurry with a mass fraction of 40%, send it to the cyanide leaching tank, add 4 cubic meters of mixed solution, and then add 170kg of sodium cyanide to obtain a mixed slurry. Adjust the temperature in the leaching tank to 20°C and mix the slurry After cyanide leaching, solid-liquid separation is carried out to obtain cyanide tailings and gold-containing liquid respectively, and the gold-containing liquid is replaced by adding zinc powder to obtain gold-containing ore slime.

[0031] Test results: the gold content in the gold concentrate is 48.3g / t, the gold content in the cyanide tailings is 0.85g / t, the calculated gold cyanide recovery rate is 98.24%, and the sodium cyanide con...

Embodiment 3

[0034] Add 10 cubic meters of water into the chemical mixing tank, add 4kg of ethylenediaminetetraacetic acid, 2kg of sodium bicarbonate, control the temperature at 20°C, and stir for 5 minutes to obtain a mixed solution. Add 60 tons of 400-mesh gold concentrate to water for Adjust the slurry to obtain a slurry with a mass fraction of 40%, send it to the cyanide leaching tank, add 6 cubic meters of mixed solution, and then add 266kg of sodium cyanide to obtain a mixed slurry. Adjust the temperature in the leaching tank to 20°C and mix the slurry After cyanide leaching, solid-liquid separation is carried out to obtain cyanide tailings and gold-containing liquid respectively, and the gold-containing liquid is replaced by adding zinc powder to obtain gold-containing ore slime.

[0035] Test results: the gold content in the gold concentrate is 52.7g / t, the gold content in the cyanidation tailings is 0.87g / t, the calculated gold cyanide recovery rate is 98.35%, and the sodium cyanid...

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Abstract

The invention belongs to the technical field of smelting, and particularly relates to a method for reducing sodium cyanide consumption in a gold concentration cyanide leaching process. The method forreducing the sodium cyanide consumption in the gold concentration cyanide leaching process comprises the following steps that step A, water, ethylene diamine tetraacetic acid and sodium bicarbonate are stirred and mixed uniformly, andmixed liquid is obtained; step B, water is added into gold concentration mineral powder to perform size mixing, a sizing agent of 37-42% by mass is obtained, and themixed liquid obtained in the step A and sodium cyanide are added to obtain mixed mineral pulp; and step C, the mixed mineral pulp obtained in the step B is subjected to solid-liquid separation treatment. Operation of the method for reducing the sodium cyanide consumption in the gold concentration cyanide leaching process is simple, ethylene diamine tetraacetic acid and sodium bicarbonate are addedinto the gold concentration sizing agent to be combined withresiduary copper ions, iron ions and magnesium ions of the sizing agent, and the consumption of cyanide by heavy metal ions t is reduced, so that the using amount of sodium cyanide is reduced, and the recovery rate of gold is improved.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for reducing sodium cyanide consumption in the process of cyanide leaching of gold concentrate. Background technique [0002] In my country, the method of directly producing gold by cyanidation of gold concentrates accounts for half of the gold industry production. Gold ores contain a large amount of impurities. For example, when the ores contain pyrrhotite or marcasite, they will decompose under alkaline conditions. FeSO 4 and Fe(OH) 2 , realgar, orpiment, stibnite, etc. containing arsenic and antimony can generate Na under alkaline conditions 2 AsO 3 , NaAsS 4 , NaSbO 2 、Na 2 Sb 3 Wait. These impurities consume sodium cyanide and oxygen during cyanide leaching, thereby increasing production costs. The current common process is to use alkaline leaching to dissolve impurities in water under alkaline conditions, and then remove impurities by solid-liq...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B11/08
CPCC22B3/04C22B11/04C22B11/08Y02P10/20
Inventor 王永成徐忠敏高利发徐怀浩李雪林陈萍杨广杰
Owner ZHAOJIN MINING
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