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Novel method for separating gold and silver from gold mud

A new method, gold mud technology, applied in the field of gold and silver separation, can solve the problem of excessive metal loss, achieve the effect of reducing process steps, easy control of reaction, and improving gold and silver recovery rate

Inactive Publication Date: 2009-06-10
LINGBAO CITY JINYUAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a new method for separating gold and silver from gold mud, which makes up for the defect that the existing method has a long pretreatment process for gold mud and causes a lot of metal loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: new method for separating gold and silver in gold mud as described in the present invention, comprises the following steps: the gold mud that adds water to moisten after the wet gold mud that cyanide method is produced and filter paper, filter cloth ashing is sent into reactor, adds hydrochloric acid and Sodium chlorate, wet gold mud, the weight ratio of hydrochloric acid and sodium chlorate is 1:1.2:0.25, use steam to heat indirectly, keep the temperature in the reactor at 84 ° C, leaching for 4 hours, gold and impurity elements zinc, lead, copper, Iron etc. dissolve and enter the solution, and silver forms silver chloride precipitates. After vacuum filtration, the filtrate is a gold-containing solution, and the filter cake is silver chloride precipitates; the filter cakes of silver chloride precipitates will be sent to the replacement reactor, and dilute HCl As the medium, it is replaced with iron powder. After the silver powder is washed and vacuum-filte...

Embodiment 2

[0015] Embodiment 2: new method for separating gold and silver in gold mud as described in the present invention, comprises the following steps: the wet gold mud and filter paper, filter cloth graying of carbon slurry method production are sent into reactor, add hydrochloric acid and Sodium chlorate, wet gold mud, the weight ratio of hydrochloric acid and sodium chlorate is 1:1:0.1, adopt electric heating method, keep the temperature in the reactor at 79 ℃, leaching for 5 hours, gold and impurity elements zinc, lead, copper, Iron etc. dissolve and enter the solution, and silver forms silver chloride precipitates. After vacuum filtration, the filtrate is a gold-containing solution, and the filter cake is silver chloride precipitates; the filter cakes of silver chloride precipitates will be sent to the replacement reactor, and dilute HCl As the medium, it is replaced with iron powder. After the silver powder is washed and vacuum-filtered to a moisture content of 20%, it is smelte...

Embodiment 3

[0016] Embodiment 3: new method for separating gold and silver in gold mud according to the present invention, comprises the following steps: the wet gold mud and filter paper, filter cloth ashing of the wet gold mud that cyanide method is produced are sent into reactor, add hydrochloric acid and Sodium chlorate, wet gold mud, the weight ratio of hydrochloric acid and sodium chlorate is 1:1.5:0.4, use steam to heat indirectly, keep the temperature in the reactor at 89°C, leaching for 3 hours, gold and impurity elements zinc, lead, copper, Iron etc. dissolve and enter the solution, and silver forms silver chloride precipitates. After vacuum filtration, the filtrate is a gold-containing solution, and the filter cake is silver chloride precipitates; the filter cakes of silver chloride precipitates will be sent to the replacement reactor, and dilute HCl As the medium, it is replaced with iron powder. After the silver powder is washed and vacuum-filtered to 10% moisture, it is melte...

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PUM

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Abstract

The invention provides a novel method for separating gold and silver from gold slime, which comprises: wet gold slime is subjected to one-step chloridizing leaching and filtered; filtrate is a gold-containing solution, and filter cakes are silver chloride deposit; the gold-containing solution is reduced to obtain gold powder which is then smelted into gold ingots; and the filter cakes, namely the silver chloride deposit, are converted into coarse silver powder which are then smelted into silver ingots. The method adopts one-step chloridizing gold leaching reaction to overcome the defect of large metal loss due to long pretreatment flow of the gold slime and high frequency of filtration reaction in the prior art, only uses a hydrochloric acid and sodium chlorate during chloridizing and gold leaching, is easy to control the reaction, removes the process of pre-leaching the gold slime and removing impurities in the prior art, removes multi-step reduction, reduces the processing step, greatly reduces the discharge amount of wastewater, reduces the heating duration, saves the cost of water and electricity, and improves the recovery rate of the gold and the silver and the quality of the gold ingots and the silver ingots.

Description

technical field [0001] The invention relates to a new method for separating gold and silver from gold mud. Background technique [0002] In the past, in the gold mining and smelting industry, pyrometallurgy-water crushing-acid dissolution method and pyrometallurgy electrolysis method were generally used to separate metals from gold mud produced by cyanidation. These two methods have high cost and low recovery rate of gold and silver. Low; with the development and progress of technology, the method of separating gold and silver in gold mud with ammonia water, the method of separating gold and silver by full wet method, etc. have appeared. At present, in gold mining and smelting, most of them adopt the aqua regia method and the controlled current chlorination method. The aqua regia method is to carry out three leaching reactions and three vacuum filtrations on the gold mud in the pure water-nitric acid system solution. Carry out gold reduction on the gold-containing solution,...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/10C22B3/22C22B3/46
CPCY02P10/20
Inventor 晋建平刘必兴李虎增王树芳马剑波
Owner LINGBAO CITY JINYUAN MINING
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