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Method for separating and recovering gold and copper from copper-bearing cyanide pregnant solution

A technology for recovering gold and precious liquid, which can be applied in the direction of improving process efficiency, and can solve the problems of large dosage of chemicals, high operating costs, and equipment corrosion protection.

Active Publication Date: 2014-01-22
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the gold-loaded carbon comes from the cyanidation gold extraction process, that is, gold-bearing ore→cyanide leaching→activated carbon adsorption. In the end, it is possible to obtain high-copper-loaded gold carbon
The desorption, electrowinning and smelting of high-copper carbon to gold smelters will cause major problems. In the prior art, most of them are limited to the pre-decopper treatment of high-copper carbon, or the improvement and optimization of analytical electrowinning process, or the The change of mining and selection process, etc., has improved to a certain extent, but there are also a series of problems arising from it, such as long analysis time, inconvenient operation, large amount of chemicals, equipment corrosion, high operating costs and unfavorable to the environment, etc.

Method used

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  • Method for separating and recovering gold and copper from copper-bearing cyanide pregnant solution
  • Method for separating and recovering gold and copper from copper-bearing cyanide pregnant solution
  • Method for separating and recovering gold and copper from copper-bearing cyanide pregnant solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: A certain oxidized ore dressing and smelting plant has a daily processing capacity of 2,000 tons, and adopts the technological process of "grinding → combined leaching with cyanide → three-stage countercurrent washing → gold extraction with activated carbon". High, the water volume is about 400m3 / hr, and the water quality is shown in Table 1.

[0030] Table 1 Analysis results of water quality of copper-containing cyanide precious liquid in an oxide ore dressing and smelting plant

[0031]

[0032] Get this copper-containing cyanide precious liquid of 15L and adopt the process of the present invention to process:

[0033] Step 1: pH adjustment process. Add lime 0.28g / L, mechanically stir for about 10 minutes, and the pH value is about 10.07; then, pump into the buffer tank for the next step of circular catalytic oxidation. The second step: cyclic catalytic oxidation process. Use a dissolved air pump to mix the ozone-containing gas with the copper-contain...

Embodiment 2

[0047] Repeat Example 1 according to the above-mentioned same steps, but the difference is that the water quality of the original copper-containing cyanide noble liquid is different (see Table 6). The first step adjusts the pH value of the water body to 11.2 and the alkali used is caustic soda. The gas-liquid ratio in the step is 25%, and the ultraviolet light intensity at λ=254nm is 400 μW-SEC / cm2; other technical parameters and steps are the same as in Example 1.

[0048] Table 6 Analysis results of water quality of copper-containing cyanide precious liquid in an oxide ore dressing and smelting plant

[0049]

[0050] Example 2 After being treated by the above method, the amount of caustic soda consumed in the first step is 0.1 g / L;

[0051] Table 7 Analysis results of water quality after oxidation of copper-containing cyanide precious liquid in an oxidation ore dressing and smelting plant

[0052]

[0053] The slag produced in the third step is 0.29g / L (dry weight), ...

Embodiment 3

[0064] Repeat Example 1 according to the same steps above, but the difference is that the water quality of the original copper-containing cyanide noble liquid is different (see Table 10). In the first step, the pH value of the water body is adjusted to 10.82. In the second step, the gas-liquid mixing device is a jet device, the gas-liquid ratio is 20%, and the ultraviolet light intensity of λ=254nm is 350μW-SEC / cm2; other technical parameters and steps are the same as in Example 1.

[0065] Table 10 Water quality analysis results of copper-containing cyanide precious liquid in an oxide ore dressing and smelting plant

[0066]

[0067] Example 2 After being treated by the above method, the amount of lime consumed in the first step is 0.29g / L;

[0068] Table 11 Analysis results of water quality after oxidation of copper-containing cyanide precious liquid in an oxidation ore dressing and smelting plant

[0069]

[0070] The slag produced in the third step is 0.35g / L (dry w...

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Abstract

The invention relates to a method for separating and recovering gold and copper from a copper-bearing cyanide pregnant solution. A group technology of a catalytic oxidation method, a chemical precipitation method and an active carbon adsorption method is adopted to selectively remove copper from the copper-bearing cyanide pregnant solution, gold and copper in the pregnant solution are separated and recovered to the greatest extent, copper is recovered in a copper hydroxide slag form, and gold is recovered in a low copper gold-loaded carbon form.

Description

1. Technical field [0001] The invention relates to a method for separating and recovering gold and copper, in particular to a method for separating and recovering gold and copper from copper-containing cyanide liquid, which is characterized in that gold and copper are separated and recovered to the greatest extent, and low-copper-loaded gold carbon and Copper hydroxide slag. 2. Background technology [0002] At present, there are many gold smelters in China that use gold-loaded carbon as raw materials to process and produce gold, degolded carbon and other products. The main processes include three parts: analytical electrowinning, gold smelting and carbon regeneration. 30% of production. Most of the gold-loaded carbon comes from the cyanidation gold extraction process, that is, gold-bearing ore→cyanide leaching→activated carbon adsorption. It is possible to obtain high copper-loaded gold carbon in the end. The desorption, electrowinning and smelting of high-copper carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08
CPCY02P10/20
Inventor 朱秋华穆国红方荣茂衷水平甘永刚陈庆根张文波王中溪胡敏廖德华
Owner ZIJIN MINING GROUP
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