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Method for recovering gold from all-sliming cyanidation gold extraction slag

A cyanide leaching gold and gold technology, applied in the field of gold recovery, can solve the problems of gold loss and poor floatability, and achieve the effects of floatability recovery, low production cost and convenient operation

Inactive Publication Date: 2009-03-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the leaching slag is strongly affected by strong alkali and cyanide, its gold-bearing minerals are also strongly inhibited, and even its surface properties have changed. For example, gold-bearing yellow ore iron is oxidized to scorodite, etc. In addition, the particle size of full mud cyanidation is very fine, it is difficult to effectively recover the gold in it by conventional beneficiation methods, and it is easy to cause the loss of gold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the mass ratio of 2:1, sulfuric acid and acetone are added into the slurry of the full mud cyanidation gold leaching slag with a concentration of 35%, and 20 grams of oleic acid are added according to the solids per ton in the slurry, and the Mix the pulp and stir for 5-10 minutes, adjust the pH value of the pulp to 7-8, and then add a conventional amount of conventional flotation agents such as copper sulfate and sulfide ore collectors according to the chemical composition of the pulp and based on the mass of solids per ton in the pulp , foaming agent, etc. for flotation. The flotation process adopts the process of primary roughing, secondary beneficiation, three-time sweeping, and middle ore return in turn. From the leaching residue with a gold content of 2g / t, the gold content is greater than 50g. / t of gold concentrate, the gold recovery rate is greater than 90%.

Embodiment 2

[0015] The leaching slag treated in this embodiment is the leaching slag after heap leaching of raw ore to extract gold. First, the leaching slag is ground to -200 mesh 90-93%, and then after being adjusted into ore pulp, hydrochloric acid and organic ketones were added to the slurry with a concentration of 45%, and at the same time, 50 grams of sodium oleate was added according to the amount of solids per ton in the slurry, and the slurry was stirred for 5-10 minutes, and the pH value of the slurry was adjusted to 7-8 , and then according to the chemical composition of the pulp, and according to the mass of solids per ton in the pulp, a conventional amount of conventional flotation agents such as copper sulfate, sulfide ore collectors, foaming agents, etc. are added for flotation, and the flotation process adopts conventional processes The process is to obtain a gold concentrate with a gold content greater than 40g / t from the original leaching residue with a gold content of 1....

Embodiment 3

[0017] According to the mass ratio of 3:1, sulfuric acid and organic ketones are added into the slurry of 20% full mud cyanidation gold leaching slag, and 28 grams of oleic acid are added according to the solids per ton in the slurry, After pulping and stirring for 5 to 10 minutes, the pH value of the pulp is adjusted to 7 to 8, and then according to the chemical composition of the pulp, and based on the mass of solids per ton in the pulp, a conventional amount of conventional flotation agents such as copper sulfate is added to collect the sulfide ore. flotation agent, foaming agent, etc., and the flotation process adopts a conventional process. From the original leaching residue with a gold content of 3g / t, a gold concentrate with a gold content greater than 80g / t is obtained, and the gold recovery rate is greater than 90%.

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PUM

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Abstract

The invention provides a method for recovering gold from all-slime cyanidation leaching gold residue. The method includes the flotation technology which is characterized in that: in the slurry of the all-slime cyanidation leaching gold residue, sulphuric acid and organic ketone are added till the pH value of the slurry is 7 to 8, wherein, the sulphuric acid and the organic ketone are added according to the mass ratio of 2 to 5:1 to 2; simultaneously, according to 0.02 permile to 0.05 permile of the solid mass of the slurry, oleic acid or oleate is added, and after the flotation technology, gold concentrate is obtained. The addition of the sulphuric acid and the organic ketone takes the function of neutralization of the alkalescence of the slurry and the surface cleaning of minerals, and furthermore, activates gold-bearing minerals, the floatability of which is recovered and increased. The oleic acid or the oleate can cause partial unactivated gold-bearing minerals with fine grains to produce flocculation, and then become concentrate products which float off with other gold-bearing minerals, thereby improving the gold recovery rate which can reach over 90 percent. The method has simple technology, convenient operation, low manufacturing cost and high gold recovery rate.

Description

technical field [0001] The invention relates to a method for recovering gold from all-slime cyanidation gold leaching slag, and belongs to the technical field of mineral processing. Background technique [0002] Full mud cyanidation gold leaching slag adopts the method of full mud leaching. The remaining tailings after recovering gold still contain gold, and the gold content is generally above 1g / t, which is a secondary resource. Because the leaching slag is strongly affected by strong alkali and cyanide, its gold-bearing minerals are also strongly inhibited, and even its surface properties have changed. For example, gold-bearing yellow ore iron is oxidized to scorodite, etc. In addition, the particle size of the whole mud cyanide is very fine, it is difficult to effectively recover the gold in it by conventional beneficiation methods, and it is easy to cause the loss of gold. Contents of the invention [0003] In order to effectively recover the gold in the cyanidation g...

Claims

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Application Information

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IPC IPC(8): C22B11/08C22B7/00C22B3/06
CPCY02P10/20
Inventor 刘全军
Owner KUNMING UNIV OF SCI & TECH
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