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Dearsenification method of gold concentrates

A gold concentrate and arsenic removal technology, applied in the field of gold concentrate removal, can solve the problems of high consumption of chemicals, low gold leaching rate, poor selectivity, etc., and achieve low equipment construction cost, stable arsenic-containing substances, and low Arsenic works well

Inactive Publication Date: 2015-11-25
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing gold concentrate treatment process, if the arsenic content is high, the arsenic will enter the smoke and dust during the pyrometallurgy process, causing air pollution, and may cause secondary wrapping of gold, reducing the leaching rate of gold
The existing fire treatment process, such as two-stage roasting and lime roasting, cannot achieve the effect of removing arsenic very well.
Some chemical treatment processes, due to poor selectivity, large consumption of chemicals, and incomplete treatment, are mostly in the laboratory stage
There are few studies on biological arsenic removal. In the prior art, stirring biological oxidation is mainly used. This method has poor selectivity to sulfide ore, insufficient removal of arsenic, high sulfur oxidation rate, large amount of subsequent wastewater treatment, and sulfur content up to Less than smelter processing requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Crushing the low-grade bulk mineral material or heap leaching tailings to 40mm, sieving the material smaller than 5mm, and using the rest as supports;

[0023] (2) Adjust the gold concentrate water into a slurry with a concentration of 70%, and spray it on the surface of the support made in step (1), wherein the mass ratio of the support to the gold concentrate is 10:1, and the gold concentrate contains arsenic 2.13%, containing 34.93% sulfur;

[0024] (3) Pile up the sprayed supports;

[0025] (4) Continuous dripping with a concentration of 20g / L sulfuric acid aqueous solution until the pH value of the exudate remains below 1.5;

[0026] (5) The bacterial liquid containing Thiobacillusthiooxidans, Acidithiobacilluscaldu, Leptospirillum ferriphilum and Sulfobacillusthermosulfidooxidans with a potential of 550-600mv in a quantitative ratio of 71:23:6 (Yang Xianwan, Shen Qingfeng. Microbial Hydrometallurgy. [M]. Beijing: Metallurgical Industry Publishing House, 2003...

Embodiment 2

[0030] (1) Crushing the low-grade bulk mineral material or heap leaching tailings to 40mm, sieving the material smaller than 5mm, and using the rest as supports;

[0031] (2) Adjust the gold concentrate water into a slurry with a concentration of 60%, and spray it on the surface of the support made in step (1), wherein the mass ratio of the support to the gold concentrate is 7:1, and the gold concentrate contains arsenic 2.13%, containing 34.93% sulfur;

[0032] (3) Pile up the sprayed supports;

[0033] (4) Continuous dripping with a concentration of 20g / L sulfuric acid aqueous solution until the pH value of the exudate remains below 1.5;

[0034](5) The bacteria solution of Thiobacillusthiooxidans, Acidithiobacilluscaldu, Leptospirillum ferriphilum and Sulfobacillusthermosulfidooxidans with a potential of 550-600mv in a quantitative ratio of 71:23:6 (Yang Xianwan, Shen Qingfeng. Microbial Hydrometallurgy. [M]. Beijing: Metallurgical Industry Publishing Society, 2003:200) i...

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PUM

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Abstract

The invention discloses a dearsenification method of gold concentrates. The method comprises the following steps: preparing the gold concentrates into ore pulp, then spraying onto the surface of a block-shaped supporting object, and piling in; dropping and leaching with bacterial liquid; washing to remove acid through clean water; performing ore washing through an ore washing machine, so as to separate the support from the gold concentrates to obtain a product. The method has the advantages of being small in device assembling cost, small in energy consumption, good in the dearsenification effect, free of arsenic flue dust, adjustable in scale, and easy for industrialization; the leaked bacterial liquid contains iron, and arsenic can be removed completely after adjusting alkali and depositing; in addition, arsenic-containing substances are stable.

Description

technical field [0001] The invention belongs to the technical field of gold concentrate production, and in particular relates to a method for removing arsenic from gold concentrate. Background technique [0002] In the existing gold concentrate treatment process, if the arsenic content is high, the arsenic will enter the smoke and dust during the pyrometallurgy process, causing air pollution, and may cause secondary wrapping of gold, reducing the leaching rate of gold. The existing fire treatment process, such as two-stage roasting and lime roasting, cannot achieve the effect of removing arsenic very well. Some chemical treatment processes are mostly in the laboratory stage due to poor selectivity, large consumption of chemicals, and incomplete treatment. There are few studies on biological arsenic removal. In the prior art, stirring biological oxidation is mainly used. This method has poor selectivity to sulfide ore, insufficient removal of arsenic, high sulfur oxidation r...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B3/18C22B11/00
CPCY02P10/20
Inventor 黄怀国董博文李黎婷叶志勇陈启斌钟俊杨彩云王梅君刘燕平
Owner 厦门紫金矿冶技术有限公司
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