Refractory gold concentrate biological oxidizing slag cyaniding and gold-extracting method

A technology for biological oxidation and refractory gold, which is applied in the fields of cyanidation gold extraction, high arsenic and high carbon of high-sulfur refractory gold concentrate bio-oxidation slag, and can solve the problem of low gold leaching rate, low gold content in leaching slag, Problems such as high gold content, to achieve the effect of increasing the leaching rate

Inactive Publication Date: 2011-04-06
ZIJIN MINING GROUP
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  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems of low gold leaching rate, high gold content in leaching slag, large consumption of sodium cyanide and drug removal from concentrate in high arsenic, high carbon, high sulfur refractory gold concentrate extraction process and cyanidation gold extraction process of biological oxidation slag. High cost and other shortcomings, aiming to provide a high-arsenic, high-carbon, high-sulfur product with high gold leaching rate, low gold content in leaching slag, low sodium cyanide consumption, low sodium cyanide concentration in cyanidation tail liquid, and no need for drug removal of concentrate. Method for extracting gold by cyanidation of biological oxidation slag of refractory gold concentrate

Method used

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  • Refractory gold concentrate biological oxidizing slag cyaniding and gold-extracting method
  • Refractory gold concentrate biological oxidizing slag cyaniding and gold-extracting method
  • Refractory gold concentrate biological oxidizing slag cyaniding and gold-extracting method

Examples

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Effect test

example 1

[0027] Example 1: Take 1 kg of ore, use iron-free 9K medium as nutrient substance, account for 87% of the gold concentrate particle size of -320 mesh, 18% of pulp concentration, 5 days of oxidation time, temperature of 42 ° C, initial pH of oxidation = 2.3, The dissolved oxygen amount is 1-2ppm, the linear stirring speed is 50m / min, the pH of the solution after oxidation is 0.30, and the oxidation rate of the final sulfide is 98.20%. The leaching rate of direct cyanide carbon leaching gold from oxidation residue is 82.98%. Solid-liquid separation of oxidation slag, washing with water, followed by cyanide carbon leaching, and second cyanide carbon leaching after carbon leaching slag regrinding, using a rod mill for grinding. The grinding conditions are: grinding time 1 minute, particle size -320 Mesh accounts for 90%, and the cyanide carbon leaching condition is: time 18 hours, pH=11, gac consumption 10g / L, sodium cyanide consumption 4kg / t ore, obtain final gold recovery rate 9...

example 2

[0028] Example 2: Take 1 kg of ore, and carry out a biological oxidation test according to the oxidation conditions of Example 1, and finally obtain a sulfide oxidation rate of 97.92%. The leaching rate of direct cyanide carbon leaching gold from oxidation residue is 83.26%. Solid-liquid separation of oxidation slag, washing with water, followed by a cyanide carbon leaching, and carbon leaching slag regrinding followed by a second cyanide carbon leaching, using a ball mill for grinding, the grinding conditions are: grinding time 30 minutes, particle size -200 mesh 90%, the cyanide carbon leaching conditions are: time 18 hours, pH=11, activated carbon dosage 10g / L, sodium cyanide dosage 4.5kg / t ore, the final gold recovery rate is 98.35%, and the gold leaching rate is higher than once Cyanide carbon leaching increased by 15.39%, and the concentration of sodium cyanide in the cyanide tail liquid was 85mg / L.

example 3

[0029] Example 3: Take 1kg of ore, and carry out the biological oxidation test according to the oxidation conditions of Example 1. The oxidized slag is leached while grinding by a ball mill, and the conditions for leaching while grinding are: time 24 hours, liquid-solid ratio 4: 1, pH=11 , The dosage of activated carbon is 15g / L, the dosage of sodium cyanide is 5kg / t ore, and the final gold leaching rate is 97.23%.

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Abstract

The invention relates o a refractory gold concentrate biological oxidizing slag cyaniding and gold-extracting method, which is characterized in that: a washed oxidizing slag cyanidation carbon-in-pulp leaching method is that: the slag subjected to primary cyanidation carbon-in-pulp leaching is re-ground and subjected to secondary cyanidation carbon-in-pulp leaching, and the grinding and the leaching are carried out simultaneously, or a film-prevention reagent is added during cyanidation carbon-in-pulp leaching. A complicated reagent removal flow is not needed in the process of floating the gold concentrate, and the gold concentrate can be directly subjected to biological oxidation. By the method, the gold leaching rate is greatly improved on the basis of the primary cyanidation carbon-in-pulp leaching, the cost of removing reagents in the process of floating the gold concentrate is saved, the leaching rate of the process is improved to 96-98 percent from 82-85 percent of the traditional biological oxidation-cyanidation carbon-in-pulp leaching method, the gold content in tailings is reduced to 1-2g/t from 10-13g/t, the sodium cyanide consumption is reduced to 1-3kg/t from 10-30kg/t, and the concentration of sodium cyanide in cyanidation raffinate is 50-100mg/L. The method has the advantages of high gold leaching rate, low sodium cyanide consumption, low concentration of sodium cyanide in the cyanidation raffinate and the like, and is easy to operate and environment-friendly.

Description

1. Technical field [0001] The invention relates to a method for extracting gold by cyanidation of refractory gold concentrate biological oxidation slag, in particular to a method for extracting gold by cyanidation of refractory gold concentrate with high arsenic, high carbon and high sulfur content. 2. Background technology [0002] my country's Guizhou, Yunnan and other places have a large number of low-grade refractory gold mines, the gold grade is only 1-6g / t, the gold in the ore is wrapped by sulfides mainly composed of pyrite and arsenopyrite, and the gold-loaded The particle size of the mineral itself is also very fine, and the gold content is unstable, especially with a large amount of harmful impurities such as arsenic and organic carbon. The recoveries are all less than 10%, and the consumption of sodium cyanide is large. At present, the processing of such ores mostly adopts the fine grinding-flotation-pre-oxidation-cyanidation gold extraction process. Due to the par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 黄中省阮仁满伍赠玲衷水平邹刚王瑞永甘永刚
Owner ZIJIN MINING GROUP
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