Method for environmentally-friendly treatment and recycling of cyanide barren solution

A treatment cycle and environmental protection technology, applied in the direction of improving process efficiency, etc., can solve the problems of low concentration of lye, hydrogen cyanide pollution, environmental pollution and other problems, to improve the recovery rate of cyanide, increase zinc concentrate products, The effect of reducing environmental pollution

Active Publication Date: 2019-02-26
刘西分
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Problems solved by technology

At present, the most commonly used economical and effective treatment method in China is the acidification method to recover sodium cyanide and reduce the impurity ions in the circulating liquid, so as to maintain the recovery rate of gold and silver; a large amount of cyanide in the process of acidification and lye absorption in the process of barren solution treatment Hydrogen gas has caused environmental pollution, and cyanide smelters have been forced to use less or stop using it
[0003] During the acidification process of the lean solution, directly add sulfuric acid to adjust the pH to below 2. The lime in the lean solution not only consumes a large amount of acid, but also the calcium sulfate produced during the reaction affects the copper grade in the filter cake and causes scaling and blockage of the acidification tower and pipelines. The pipeline must be replaced frequently, seriously affecting the normal production
[0004] In the hydrogen cyanide lye absorption stage, due to the low concentration of lye, it takes a long time for multiple cycles of absorption, resulting in gas overflow and affecting the environment. The concentration of sodium cyanide in the absorption liquid is unstable when returning to the leaching process, and the sodium hydroxide has not been reacted. also wasted
[0005] At present, although the simple acidification process of direct acidification and alkalization of the acidification supernatant into cyanidation leaching has been developed, it is still unavoidable that a large amount of hydrogen cyanide is scattered into the air to pollute the environment, and the zinc ions in the barren solution are still present in the barren solution after treatment. Problems with accumulation in leach systems

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  • Method for environmentally-friendly treatment and recycling of cyanide barren solution

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Experimental program
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Effect test

Embodiment 1

[0032] 1) Cyanide sinking operation: the total cyanide content in the cyanide-containing barren solution is 4526mg / L, and the gold content is 0.02g / m 3 , the silver content is 0.05g / m 3 , with a copper content of 0.862g / L and a zinc content of 1.42g / L, add zinc chloride and stir for 0.5-1 hour, during which the pH is controlled at 7.6-8.2. The ore pulp was precipitated in the sedimentation tower for 2 hours, and the precipitate was filtered into cyanide filter cake and filtrate 1.

[0033] 2) Cyanide precipitation conversion: add water 1.5 times the weight of the cyanide filter cake into the stirring tank, start stirring, add the cyanide filter cake into the stirring tank, slowly add sodium carbonate, control the pH value to 11, and stir for 1.5 hours . The pulp is filtered and washed to obtain filtrate 2 and carbonic acid slag.

[0034] 3) Acidification of carbonic acid slag filter cake: Carbonic slag and water are added into the closed stirring tank according to the mass ...

Embodiment 2

[0039] 1) Cyanide sinking operation: the total cyanide content in the cyanide-containing barren solution is 4526mg / L, and the gold content is 0.02g / m 3 , the silver content is 0.05g / m 3 , with a copper content of 0.862g / L and a zinc content of 1.42g / L, add zinc sulfate and stir for 0.5-1 hour, during which the pH is controlled at 7.6-8.2. The ore pulp was precipitated in the sedimentation tower for 2 hours, and the precipitate was filtered into cyanide filter cake and filtrate 1.

[0040] 2) Cyanide precipitation conversion: cyanide filter cake is added to the stirring tank at a weight ratio of 30%, the pulp temperature is controlled at 30°C, sodium carbonate is slowly added, and the pH value is controlled at 11, and stirred for 1.5 hours. The pulp is filtered and washed to obtain filtrate 2 and carbonic acid slag.

[0041] 3) Acidification of carbonic acid slag filter cake: Carbonic slag and water are added into the closed stirring tank according to the mass ratio of 20:80,...

Embodiment 3

[0046] 1) Cyanide sinking operation: the total cyanide content in the cyanide-containing barren solution is 4526mg / L, and the gold content is 0.02g / m 3 , the silver content is 0.05g / m 3 , with a copper content of 0.862g / L and a zinc content of 1.42g / L, add zinc chloride and stir for 0.5-1 hour, during which the pH is controlled at 7.6-8.2. The ore pulp was precipitated in the sedimentation tower for 2 hours, and the precipitate was filtered into cyanide filter cake and filtrate 1.

[0047] 2) Cyanide precipitation conversion: cyanide filter cake is added to the stirring tank at a weight ratio of 30%, the slurry temperature is controlled at 30°C, potassium carbonate is slowly added, and the pH value is controlled at 11, and stirred for 1.5 hours. The pulp is filtered and washed to obtain filtrate 2 and carbonic acid slag.

[0048] 3) Acidification of carbonic acid slag filter cake: add 30% weight ratio of carbonic acid slag filter cake into the closed stirring tank, slowly ad...

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Abstract

The invention relates to a method for environmentally-friendly treatment and recycling of a cyanide barren solution. The method comprises the following steps: carrying out cyanide sedimentation operation on a cyanide-containing barren solution, carrying out cyaniding precipitate conversion, acidifying carbonic acid residue filter cakes, preparing a cyanide sedimentation agent, and feeding back obtained filtrate to a cyanide leaching procedure to achieve the environmentally-friendly treatment and recycling of the cyanide barren solution. By adopting the method provided by the invention, the environmentally-friendly treatment and recycling of the cyanide barren solution are achieved, a process of direct barren solution acidification is avoided, sodium cyanide is in liquid, and thus environment pollution caused by hydrogen cyanide is greatly reduced; the sodium cyanide is recycled and reused with copper and zinc comprehensively, the production cost is lowered, and environment protection requirements on treatment of the cyanide-containing barren solution can be met.

Description

technical field [0001] The invention relates to a process method for treating poor liquid and waste liquid in gold smelting and an environmental protection process, and relates to an environment-friendly treatment and recycling method for poor cyanide liquid. Background technique [0002] In the gold production process, the cyanidation method is mainly used to extract gold and silver. Sodium cyanide (potassium) is the most effective and widely applicable agent for leaching gold and silver at normal temperature and pressure. During the leaching process, due to the accumulation of a large number of impurity ions in the leaching system, the cyanide leachate fatigues after multiple cycles, and the leaching effect is low. Significantly decreased. At present, the most commonly used economical and effective treatment method in China is the acidification method to recover sodium cyanide and reduce the impurity ions in the circulating liquid, so as to maintain the recovery rate of g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20
CPCC22B19/26Y02P10/20
Inventor 刘西分常红刘常慧
Owner 刘西分
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