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Method for recycling gold from refractory gold concentrate

A technology for refractory gold treatment and gold recovery, applied in the direction of improving process efficiency, etc., can solve the problem of low gold recovery rate, achieve the effect of low gold grade, high leaching rate, and less treatment and recovery time

Active Publication Date: 2009-03-04
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have a good effect on the treatment of pure sulfide-coated gold concentrates, but when processing complex-packed gold concentrates, the gold grade in the cyanide slag is still relatively high, and the recovery rate of gold is low

Method used

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  • Method for recycling gold from refractory gold concentrate

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Experimental program
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Effect test

Embodiment 1

[0028] Use refractory gold concentrate with a particle size of -0.075mm>75% (the grade of gold in the gold concentrate is 186.3g / t), the liquid-solid ratio is 3:1, and the concentration of sodium cyanide is controlled at 3‰, stirring and leaching for 16 hours , and then filter; add the leaching residue that was stirred and leached into the mill and leaching machine, the liquid-solid ratio is 2:1, the concentration of sodium cyanide is controlled at 3‰, soak for 3 hours while grinding, and then filter. The leaching rate of gold reached 98.28%, the grade of gold in the leaching residue was reduced to 3.2g / t, and the consumption of sodium cyanide reached 23.5kg / t. The precious liquid is obtained, and zinc is used for replacement and recovery to obtain sponge gold.

Embodiment 2

[0030] Use refractory gold concentrate with a particle size of -0.075mm>75% (the grade of gold in the gold concentrate is 186.3g / t), the liquid-solid ratio is 4:1, and the concentration of sodium cyanide is controlled at 1‰, stirring and leaching for 24 hours , and then filtered; the conventional cyanide slag was added to the grinding and leaching machine, the liquid-solid ratio was 1:1, the sodium cyanide concentration was controlled at 4‰, soaking for 2 hours while grinding, and then filtering. The leaching rate of gold reached 97.80%, the grade of gold in the leaching residue was reduced to 4.1g / t, and the consumption of sodium cyanide reached 22kg / t. The precious liquid is obtained, and zinc is used for replacement and recovery to obtain sponge gold.

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Abstract

The invention relates to a method for recovering gold from unmanageable gold concentrate, which comprises the steps in the following process order: a. stirring and leaching: sodium cyanide solution is added into the gold concentrate to be stirred and leached; the liquid-solid ratio of the ore pulp is 1 to 4:1, the concentration of the sodium cyanide is 0.5 millesimal to 4 millesimal of the weight of the ore pulp, the leaching time is 12h to 36h, and pregnant solution 1 and leaching slag 1 are filtered; b. leaching while milling: the leaching slag 1 after stirring and leaching is put into a milling and leaching machine to be leached and milled; the liquid-solid ratio of the ore pulp is 1 to 4:1, the concentration of the sodium cyanide is 0.5 millesimal to 4 millesimal of the weight of the ore pulp, the milling and leaching time is 1h to 6h, and pregnant solution 2 and waste slag are filtered; c. recovery: the pregnant solution 1 and the pregnant solution 2 are recovered, to obtain sponge gold. The method is characterized by high gold leaching rate, low-grade gold in cyanidation tailing, short technological process, short treatment and recovery time, low sodium cyanide consumption, low requirement for the corrosion resistance of the equipment and the like, and is in particular applicable in the recovery and application of the gold in gold concentrate with complicated package.

Description

1. Technical field [0001] The invention relates to a method for recovering gold from refractory gold concentrates, which is particularly suitable for the recovery application of complex wrapped gold concentrates. 2. Background technology [0002] In the refractory gold concentrate, gold is wrapped in pyrite, arsenopyrite, carbonate and other materials in fine granular form, and the gold cannot be exposed through normal grinding. At present, the processing methods of refractory gold concentrate mainly include roasting-cyanidation, wet oxidation-cyanidation, bacterial oxidation-cyanidation and side-grinding and leaching. During roasting, flue gas containing sulfur dioxide and arsenic trioxide will be produced, which seriously pollutes the atmosphere and the environment. Wet oxidation has very high requirements on the acid corrosion resistance of equipment materials, and the investment cost of equipment is very high. The investment cost of bacterial oxidation method is relati...

Claims

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Application Information

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IPC IPC(8): C22B11/08C22B3/04
CPCY02P10/20
Inventor 邹来昌蓝碧波罗吉束黄怀国
Owner ZIJIN MINING GROUP
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