Process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon

A technology of refractory gold ore and low grade, which is applied in the gold extraction process of carbon-containing low-grade refractory gold ore and the field of arsenic, which can solve the problems of high cost, low gold leaching rate and complicated process, and achieve the goal of improving the recovery rate Effect

Inactive Publication Date: 2011-04-27
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the disadvantages of poor permeability, complicated process, high cost and low gold leaching rate in low-grade refractory gold ore biological heap leachi

Method used

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  • Process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon
  • Process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon
  • Process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Crush the ore to -10mm, and directly heap leaching cyanide, the concentration of sodium cyanide is 0.1%, and the cyanide time is 8 months. The permeation rate is basically 0.

example 2

[0034] The ore is crushed to -10mm, and then the crushed ore is screened through a -1mm sieve, the amount of fine ore under the sieve accounts for 23.23% of the total ore, and the gold content of the +1mm ore is 2.32g / t, and the + The 1mm ore is piled up for biological heap leaching oxidation, the gold content in the -1mm fine ore is 4.30g / t, and the -1mm fine ore is sent to the flotation plant for flotation of gold concentrate. Use dilute sulfuric acid with pH=1.3 to 1.6 to wash the ore heap until the pH of the washing solution is stable at 1.3 to 1.6, then transfer the acclimatized and cultivated bacterial solution. After 4 months of bacterial oxidation, the oxidation rate of sulfide is 65.98%. Wash the ore heap with dilute sulfuric acid of 1.3 to 1.6, wash out the soluble Fe and As plasma in the ore heap, then wash the ore heap with clean water, and finally wash the ore heap with sodium hydroxide or calcium hydroxide solution until the pH of the washing solution is > 9.5 Th...

example 3

[0036] The ore is crushed to below -10mm, and then the crushed ore is sieved through a -1mm sieve. The amount of fine ore under the sieve accounts for 22.02% of the total ore, and the gold content of the +1mm ore is 2.22g / t. The ore of +1mm is piled up for biological heap leaching oxidation, the gold content of -1mm fine ore is 4.36g / t, and the -1mm fine ore is sent to the flotation plant for flotation of gold concentrate. Use dilute sulfuric acid with pH=1.3 to 1.6 to wash the ore heap until the pH of the washing solution is stable at 1.3 to 1.6, then transfer the acclimatized and cultivated bacterial solution. After 5 months of bacterial oxidation, the oxidation rate of sulfide is 65.68%. Wash the ore heap with dilute sulfuric acid of 1.3 to 1.6, wash out the soluble Fe and As plasma in the ore heap, then wash the ore heap with clean water, and finally wash the ore heap with sodium hydroxide or calcium hydroxide solution until the pH of the washing solution is > 9.5 Then sta...

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Abstract

The invention relates to a process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon. The process is characterized in that: the gold ore has the characteristics of high clay mineral content, large fine ore amount after grinding, and the like. The process comprises the following steps of: grinding raw ore to 10 to -30 millimeters; sieving ore through a sample sieve of 1 to -2 millimeters or washing the ore with water so as to separate fine ore from the ore; floating gold concentrate by using the obtained fine ore; performing direct heap leaching on ore of +2 millimeter and performing biological oxidation; performing medium transformation such as acid washing, water washing, alkali washing and the like on the biologically-oxidized ore and cyaniding directly so as to extract gold, wherein gold is extracted from the floated gold concentrate by biological oxidation-cyaniding and carbon soaking-pressure oxidation-cyaniding and gold extraction or baking, oxidation and cyaniding. Due to the adoption of the process, the problem of permeability of gold ore is solved and the gold extracting rate is effectively increased from 2 to 5 percent during direct heap leaching and cyaniding to 55 to 65 percent. The process has the advantages of simple process, high gold extracting rate, low pollution, high benefit and the like.

Description

1. Technical field [0001] The invention relates to a process for extracting gold from arsenic-containing and carbon-containing low-grade refractory gold ores, in particular to a process for extracting gold from arsenic-containing and carbon-containing low-grade refractory gold ores with high mud content and high powder ore rate. 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 associated with a large amount of harmful impurities such as arsenic and organic carbon. The ore contains clay minerals. 10% to 25% of the gold deposits belong to ultra-fine disseminated gold deposits that are extremely difficult to smelt. [0003] Oxidative cyanidation gold extra...

Claims

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Application Information

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IPC IPC(8): C22B11/00
Inventor 黄中省阮仁满伍赠玲衷水平邹刚戴红光王瑞永甘永刚
Owner ZIJIN MINING GROUP
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