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Method for removing impurities contained in high-impurity crude silver

A crude silver and impurity technology, which is applied in the field of removing impurities in high-impurity crude silver, can solve the problems that are not suitable for special industrial purposes and affect the mechanical, physical and chemical properties of metals, so as to maximize product benefits and ensure purity and fineness , The effect of reducing unit power consumption cost

Active Publication Date: 2014-01-22
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The level of coarse silver impurities determines the quality and grade of the electrolytic product in the next step. At the same time, the existence of impurities seriously affects the mechanical, physical and chemical properties of the metal. It is not suitable for special industrial applications, especially the development of high-end material science and technology, which requires high requirements. Pure metal, so it must be refined to remove impurities

Method used

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  • Method for removing impurities contained in high-impurity crude silver
  • Method for removing impurities contained in high-impurity crude silver

Examples

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Effect test

Embodiment 1

[0025] 1) Crude silver melting: take crude silver as raw material, the impurity content is: Cu 0.20%, Bi 0.004%, Fe 0.004%, Pb 0.02%, Sb 0.0029%, Pd 0.003%, Se 0.009%, Te 0.008%, the crude silver Put it into a graphite clay crucible and melt it completely in an intermediate frequency furnace at 1190 ° C. In the molten state, the flowing melt is reddish white and kept for 10 minutes;

[0026] 2) Adding an oxidizing agent: After the melt reaches the above state, according to the content of the impurities Se and Te in the crude silver, the oxidizing agent consisting of potassium nitrate, borax and sodium peroxodisulfate in a mass ratio of 1:0.8:0.6 is added to the melt at one time. In the liquid, the addition amount of the oxidizing agent is 1000g, observe the color of the molten liquid at this moment, turn from red white to dark red-then turn to light red-and then gradually turn red white, this process controls the reaction time according to the amount of adding oxidant as After...

Embodiment 2

[0036]1) Crude silver melting: take crude silver as raw material, the impurity content is: Cu 0.018%, Bi 0.006%, Fe 0.006%, Pb 0.03%, Sb 0.003%, Pd 0.004%, Se 0.03%, Te 0.04%, the crude silver Put it into a graphite clay crucible and melt it completely in an intermediate frequency furnace at 1200 ° C. In the molten state, the flowing melt is reddish white and kept for 12 minutes;

[0037] 2) Adding an oxidizing agent: After the melt reaches the above state, according to the content of impurities Se and Te in the crude silver, the oxidizing agent composed of potassium nitrate, borax and sodium peroxodisulfate in a mass ratio of 1:0.9:0.7 is added to the melt at one time. In the liquid, the addition amount of oxidizing agent is 2000g, observe the color of molten liquid at this moment, turn from red-white to dark red-then turn into light red-return to red-white gradually, this process controls the reaction time according to the amount of adding oxidant as After 15 minutes, the Se...

Embodiment 3

[0047] 1) Crude silver melting: Take crude silver as raw material, the impurity content is: Cu: 0.023%, Bi: 0.008%, Fe: 0.008%, Pb: 0.04%, Sb: 0.004%, Pd: 0.005%, Se: 0.02%, Te: 0.03%, put crude silver into a graphite clay crucible, and melt it completely in an intermediate frequency furnace at 1250 ° C. In the molten state, the flowing melt is reddish white, and keep it for 15 minutes;

[0048] 2) Adding an oxidizing agent: After the melt reaches the above state, according to the content of impurities Se and Te in the crude silver, the oxidizing agent composed of potassium nitrate, borax and sodium peroxodisulfate in a mass ratio of 1:1.0:0.8 is added to the melt at one time. In the liquid, the addition amount of oxidizing agent is 1000g, observe the color of molten liquid at this moment, turn from red white to dark red-then turn to light red-return to red white gradually again, this process controls the reaction time according to the amount of adding oxidant as In 20 minutes...

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Abstract

The invention relates to a method for removing impurities contained in high-impurity crude silver. The method comprises the following several steps of: melting crude silver; adding an oxidizing agent; dredging slag; pouring a pole plate; carrying out electrolytic refining; washing silver sand; drying; carrying out fusion casting forming. The method disclosed by the invention can be used for effectively removing the principal impurities contained in high-impurity crude silver and separating and enriching the impurities by grasping the addition time and addition amount of the oxidizing agent when a crude silver raw material is melted, ensures the removal rate of the impurities, reduces the corrosion degree of a fusing agent on a crucible, ensures the quality and grade of an electrolytic product, reduces the unit power consumption cost of an electrolytic refining process, ensures the purity and color of the product and enhances the economic benefit.

Description

technical field [0001] The invention relates to a method for removing impurities in high-impurity crude silver, and belongs to the technical field of electrolytic refining of gold and silver and purity purification of rare and precious metals. Background technique [0002] At present, the impurities in crude silver are mainly Cu, Bi, Fe, Pb, Sb, Pd, Se, Te and other elements. According to the GB / T4135-2002 standard, the grades are divided into No. -2), No. 3 silver (Ag-3) three grades. The process of removing impurities in crude silver and producing pure silver is one of the main processes of silver extraction metallurgy. Crude silver mostly comes from the by-products of copper, lead, zinc and other non-ferrous metal production and the recycling of industrial waste, containing 70% to 90% of silver, 0.01% to 10% of gold, 0% to 0.15% of platinum, and 0% to 0.3% of palladium % and the balance of base metals. In addition to silver electrolytic refining, which is widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/20C22B9/10
Inventor 曹永超程泰梁志伟于龙天郭建东
Owner SHANDONG GUODA GOLD
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