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A method of leaching gold from arsenic-containing gold ore

A technology for leaching gold and gold mines, which is applied in the fields of biological hydrometallurgy and mineral processing, can solve the problems of long biological oxidation cycle and large consumption of thiourea, reduce the generation of jarosite and reduce the consumption of thiourea , the effect of increasing the content

Active Publication Date: 2019-07-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for leaching gold from arsenic-containing gold ore, to at least solve the problem of producing jarosite in the oxidation process of the existing biological oxidation method, which leads to long biological oxidation cycle and large consumption of thiourea technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 100mL of iron-deficiency and phosphorus-deficiency 9K medium, 2g of arsenic-containing gold ore, 15mL of domesticated bacteria, Fe 2 P 2 o 7 The dosage is 5.71g / L, FeSO 4 ·7H 2 The amount of O was 33.36g / L, and dilute sulfuric acid was used to adjust the pH of the solution to 1.8. After oxidation in a constant temperature shaker at 30°C with a rotation speed of 160rpm for 8 days, it was filtered to obtain filtrate and oxidation residue. The leaching rate of arsenic was 89.8%.

Embodiment 2

[0044] Add 100mL of iron-deficiency and phosphorus-deficiency 9K medium, 2g of arsenic-containing gold ore, 15mL of domesticated bacteria, Fe 2 P 2 o 7 The dosage is 14.28g / L, FeSO 4 ·7H 2 The amount of O was 16.68g / L, the pH of the solution was adjusted to 1.8 with dilute sulfuric acid, oxidized in a constant temperature shaker at 30°C with a rotation speed of 160rpm for 7 days, and then filtered to obtain filtrate and oxidation residue. The leaching rate of arsenic was 90.6%.

Embodiment 3

[0046] Add 100mL of iron-deficiency and phosphorus-deficiency 9K medium, 2g of arsenic-containing gold ore, 15mL of domesticated bacteria, Fe 2 P 2 o 7 The dosage is 22.85g / L, use dilute sulfuric acid to adjust the pH of the solution to 1.8, oxidize in a constant temperature shaking box with a rotation speed of 160rpm at 30°C for 6 days, and then filter to obtain filtrate and oxidation residue. The leaching rate of arsenic is 90.4%.

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PUM

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Abstract

The invention discloses a method for leaching gold from arsenical gold ores. The method comprises the following steps: carrying out fine grinding on the arsenical gold ores, adding arsenical gold orepowder obtained through the fine grinding into a culture medium, adding ferrous pyrophosphate and acclimated thiobacillus ferrooxidans, and adjusting a solution pH value to 1.7-1.9 for biological oxidation; and carrying out solid-liquid separation after the biological oxidation is completed to obtain oxidation slag and a filtrate, and carrying out subsequent gold leaching treatment on the oxidation slag. The method provided by the invention has the advantages that the ferrous pyrophosphate is added into the culture medium, and pyrophosphate can coordinate with Fe (III) produced during the biological oxidation, so that the Fe (III) content in a solution can be remarkably increased for higher oxidation potential of a system, and jarosite produced during the biological oxidation can be radically reduced for an effectively shortened biological oxidation cycle, which not only reduces the thiourea consumption in a subsequent gold leaching process, but also ensures good gold leaching dynamiceffects of thiourea; and a coordination compound of the pyrophosphate and the Fe (III) can be used as an oxidization agent for subsequent gold leaching using the thiourea, so that the cost is greatlyreduced.

Description

technical field [0001] The invention relates to the technical field of biological hydrometallurgy and mineral processing, in particular to a method for leaching gold from arsenic-containing gold ore. Background technique [0002] Gold is one of the most important precious metals in the world today. In the gold extraction process, cyanide method is currently the most widely used gold extraction method, but the extreme toxicity of cyanide has become less and less suitable for today's society with the theme of environmental protection. Therefore, there is an urgent need to find an efficient, non-toxic and convenient gold leaching method that can replace the cyanidation method. The thiourea method has become a research hotspot to replace the cyanidation method because of its low toxicity, fast gold dissolution rate, and few interfering ions. [0003] Gold in arsenic-bearing gold ores usually exists in extremely fine particles or submicroscopic forms, and is even embedded in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B11/00
CPCC22B3/18C22B11/04Y02P10/20
Inventor 李骞沈煌张雁徐斌姜涛杨永斌钟强罗君齐伟李光辉郭宇峰范晓慧陈许玲张元波彭志伟甘敏
Owner CENT SOUTH UNIV