Method for removing impurities in reduced gold powder

A technology for reducing gold powder and impurities, which is applied in the field of removing impurities in reduced gold powder, can solve the problems of high impurity content, affecting product quality, etc., achieve good effect of removing impurities, ensure the quality of gold ingots, and shorten the processing time

Active Publication Date: 2019-09-06
山东黄金冶炼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for removing impurities in the reduced gold powder, so as to solve the prob

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Add 3~5mol / L hydrochloric acid solution into the reaction kettle according to the liquid-solid ratio of 4:1, start stirring, adjust the rotation speed to 150r / min, feed steam to heat, and slowly raise the temperature to 60~80°C; The total amount of hydrochloric acid solution is 600L.

[0022] 2) Weigh 150kg of reduced gold powder and add it to the reaction kettle. The Ag content of the reduced gold powder is 0.0065%, the Cu content is 0.0038%, and the content of other miscellaneous items does not exceed the standard. Deposition at the bottom of the kettle;

[0023] 3) Weigh sodium chlorate according to 3% of the weight of the gold powder and dissolve it in water to make a solution for use. After step 2) the gold powder is added, add the sodium chlorate solution at one time, react for 2 to 3 hours, and then discharge and filter; chloric acid The solute mass fraction of the sodium solution was 25%.

[0024] 4) Wash the gold powder obtained in step 3) with hot water a...

Embodiment 2

[0028] 1) Add 3~5mol / L hydrochloric acid solution into the reaction kettle according to the liquid-solid ratio of 4:1, start stirring, adjust the rotation speed to 150r / min, feed steam to heat, and slowly raise the temperature to 60~80°C; The total amount of hydrochloric acid solution is 500L.

[0029] 2) Weigh 125kg of reduced gold powder and add it to the reaction kettle. The Pb content of the reduced gold powder is 0.0028%, and the content of other miscellaneous items does not exceed the standard. The feeding speed of gold powder does not exceed 5g / L per minute to prevent gold powder from depositing at the bottom of the reaction kettle;

[0030] 3) Weigh sodium chlorate according to 2.5% of the weight of the gold powder and dissolve it in water to prepare a solution for use. After the gold powder is added in step 2), add the sodium chlorate solution at one time, react for 2~3 hours, and then discharge and filter; chloric acid The solute mass fraction of the sodium solution ...

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PUM

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Abstract

The invention relates to a method for removing impurities in reduced gold powder. The method is suitable for removing the impurities such as Ag, Cu, Pb, Fe and the like in the reduced gold powder in agold refining process. The method comprises the steps of adding the reduced gold powder with the impurity exceeding the standard into a hydrochloric acid solution of 3-5 mol/L according to a liquid-solid ratio of 4: 1, and then heating to 60-80 DEG C; adding an oxidant, and reacting for 2-3 hours under strong stirring; filtering the treated reduced gold powder, and washing with hot water to be neutral, specifically the impurity content of Ag, Cu, Pb, Fe and the like in the reduced gold powder can be effectively reduced to be within the scope of the IC-Au 99.99 standard; and obtaining gold ingots meeting the requirements through fusion casting. The method has the advantages of simple process, low cost, short treatment time, good impurity removal effect and the like, and is suitable for application and popularization in the field of gold production and processing.

Description

technical field [0001] The invention belongs to the technical field of gold refining and purification, and relates to a method for removing impurities in reduced gold powder. Background technique [0002] At present, gold cyanide mud and crude gold are generally used as raw materials for purifying gold to produce gold through a controlled electric chlorination refining process, which mainly includes processes such as pre-soaking and impurity removal, chlorination to dissolve gold, and gold reduction. According to the standard electrode potential of various metals, each The first process achieves the separation of base metals and precious metals by controlling different potentials. Because the content of impurities in gold mud or crude gold fluctuates greatly, the reduced gold powder obtained through the above process may sometimes have excessive impurity content, among which Ag, Cu, Pb, and Fe are elements that are easy to exceed the standard. [0003] Currently, nitric aci...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/007C22B11/04Y02P10/20
Inventor 王明双綦春光陈明泽万里冰王夕亭杨海江单召勇刘旭坤
Owner 山东黄金冶炼有限公司
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