Recovery processing method for refining tail water with gold and silver
A technology of recycling and tailing liquid, which is applied in the field of metallurgy, can solve the problems of unstable precious metal content, precious metal loss, difficult discharge requirements, etc., and achieve the effect of prolonging the cleaning cycle and service life, improving the recovery rate of gold, and reducing the amount of input
Inactive Publication Date: 2010-12-22
HENAN ZHONGYUAN GOLD SMELTERY
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Problems solved by technology
[0002] At present, the average gold refinery in my country produces as many as thousands of cubic meters of gold-containing tail liquid every year, which not only produces great environmental pollution, but also causes the loss of precious metals
The content of precious metals in the refining tail liquid is unstable, and it is difficult to meet the emission requirements simply by using existing methods such as sedimentation, base metal reduction, and activated carbon adsorption.
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[0012] Combine below figure 1 The process flow diagram of the present invention is described further.
[0013] The recovery treatment method of gold and silver refining tail liquid, the step comprises:
[0014] (1) Settling in the collection tank: Put the pre-soaked liquid and the gold-reduced liquid and other refining tail liquid produced by the liquid chlorination method into the collection tank for settlement for more than 2 hours, and precipitate the solid gold and impurities carried in the waste liquid out, the precipitate is returned to the refining process.
[0015] (2) Potential reduction: Pour the settled supernatant waste liquid into an enamel kettle, add oxalic acid for potential reduction; measure the liquid potential, and the reduction ends when the potential drops to +300mV.
[0016] (3) Filtration and standing: After vacuum filtration, the filter residue is returned to the refining process, and the filtrate is poured into the buffer tank and left to stand for ...
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A recovery processing method for refining tail water with gold and silver belongs to the technical field of metallurgy; and the method mainly comprises the following steps: collecting the refining tail water; after settling, fetching the supernatant liquid waste and adding in the reducing agent for reducing potential; when the potential is reduced below +300mV, ending reducing; filtering and absorbing gold and silver in filter liquor with active carbon. In the recovery processing method for refining tail water, each work procedure is configured reasonably, thereby greatly reducing the gold content of discharged tail water; and the gold content is stable in index. Before processing, firstly naturally settling the tail water and intercepting much solid impurity and sediment; the put-in quantity of the reducing agent can be decreased so that the reduction reaction is more relatively sufficient; moreover, the later filtering pressure can be further reduced to prolong the cleaning period and the service life of the filtering device, thereby reducing labor quantity and saving cost.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering and treating gold and silver refining tail liquid. Background technique [0002] At present, the average gold refinery in my country produces as many as thousands of cubic meters of gold-containing tail liquid every year, which not only produces great environmental pollution, but also causes the loss of precious metals. The content of precious metals in the refining tail liquid is unstable, and it is difficult to meet the emission requirements simply by using existing methods such as sedimentation, base metal reduction, and activated carbon adsorption. Therefore, most domestic refineries usually have no choice but to set the control index of gold content in the tail liquid at a slightly higher 3-7g / m 3 . Contents of the invention [0003] The purpose of the present invention is in order to provide a kind of recovery treatment method of g...
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Login to View More IPC IPC(8): C02F9/08C02F1/70C02F1/28C02F1/62C02F103/16
Inventor 廖忠义王润年郭步河李海滨
Owner HENAN ZHONGYUAN GOLD SMELTERY