Method of recovering silver from low-silver smelting slag

A smelting slag, lower technology, applied in the field of non-ferrous metallurgy and secondary resource recovery, can solve the problems of reducing the direct yield of gold and silver, the large amount of low-silver smelting slag, and the difficulty of gold and silver, so as to save resources , high recovery rate, and the effect of reducing production costs

Active Publication Date: 2016-11-23
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-silver smelting slag has a large amount and low content, and cannot continue to be returned to the furnace for treatment, thereby reducing the direct recovery rate of gold and silver in the entire production process
[0003] Ball milling-flotation method is used to recover gold and silver in low-silver smelting slag in domestic existing technology. The tailings after flotation still contain some gold and silver. It is difficult and costly to recover gold and silver by this method.

Method used

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  • Method of recovering silver from low-silver smelting slag

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Embodiment 1

[0018] A method for recovering silver from low-silver smelting slag, comprising the following steps: adding coke accounting for 6% of the mass fraction of silver smelting slag in an electric furnace to reduce the silver smelting slag, the reduction temperature is 1200°C, and the reduction time is 3 hours to obtain gold-containing slag. Lead alloys with low silver content, lead, arsenic, antimony, copper, and nickel are reduced to simple substances, and form lead alloys with a small amount of gold and silver, and silicon, sodium, and some unreduced lead exist in the form of oxides in the reduced in the slag. Put the lead alloy in a vacuum furnace, and then control the vacuum degree to 5Pa and vacuum distillation for 2 hours at a temperature of 1000°C. The lead, arsenic, antimony, and bismuth in the lead alloy will volatilize into the volatiles to form a lead-arsenic-antimony alloy, nickel , copper, silver, gold and part of the non-volatile antimony and tellurium enter the resid...

Embodiment 2

[0020] A method for recovering silver from low-silver smelting slag, comprising the following steps: adding coke accounting for 4% of the mass fraction of silver smelting slag in an electric furnace to reduce the silver smelting slag, the reduction temperature is 1200°C, and the reduction time is 3 hours to obtain gold-containing slag. Lead alloys with low silver content, lead, arsenic, antimony, copper, and nickel are reduced to simple substances, and form lead alloys with a small amount of gold and silver, and some unreduced lead, silicon, and sodium exist in the form of oxides in the reduced in the slag. Put the lead alloy in a vacuum furnace, and then control the vacuum degree to 1Pa and vacuum distillation for 2 hours at a temperature of 1050°C. The lead, arsenic, antimony, and bismuth in the lead alloy will volatilize into the volatiles to form a lead-arsenic-antimony alloy, nickel , copper, silver, gold and part of the non-volatile antimony and tellurium enter the resid...

Embodiment 3

[0022] A method for recovering silver from low-silver smelting slag, comprising the following steps: adding coke accounting for 5% of the mass fraction of silver smelting slag in an electric furnace to reduce the silver smelting slag, the reduction temperature is 1200°C, and the reduction time is 3 hours to obtain gold-containing slag. Lead alloys with low silver content, lead, arsenic, antimony, copper, and nickel are reduced to simple substances, and form lead alloys with a small amount of gold and silver, and some unreduced lead, silicon, and sodium exist in the form of oxides in the reduced in the slag. Put the lead alloy in a vacuum furnace, and then control the vacuum degree to 10Pa and vacuum distillation for 2 hours at a temperature of 1050°C. The lead, arsenic, antimony, and bismuth in the lead alloy will volatilize into the volatiles to form a lead-arsenic-antimony alloy, nickel , copper, silver, gold and part of the non-volatile antimony and tellurium enter the resi...

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Abstract

The invention relates to a method of recovering silver from low-silver smelting slag. The method comprises the following steps: reducing the silver smelting slag; performing vacuum distillation on a lead alloy; electrolyzing a lead-arsenic-antimony alloy; and performing pressure leaching on a silver-nickel-copper alloy. The method specially comprises the following steps: adding coke to reduce the silver smelting slag to obtain the lead alloy and reducing slag; putting the lead alloy in a vacuum furnace for vacuum distillation to obtain the lead-arsenic-antimony alloy and the silver-nickel-copper alloy; electrolyzing the lead-arsenic-antimony alloy to extract lead; after water quenching and atomization, performing pressure leaching on the silver-nickel-copper alloy to obtain leaching slag containing silver and a leachate containing nickel and copper; smelting the leaching slag containing silver in an alloy furnace to extract silver; and further recovering nickel and copper from the leachate containing nickel and copper. The highlights of the method lie in that noble metals such as gold and silver in the low-silver smelting slag are recovered, and meanwhile, an open circuit of lead in a treatment process of copper anode slime is realized, so that resources are reutilized, the production cost is lowered, resources are saved, and the method is of quite important significance either in resource recovery or environmental protection.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy and secondary resource recovery, and in particular relates to a method for recovering silver from low-silver smelting slag. Background technique [0002] The main treatment process of existing copper anode slime is "copper anode slime - pressure leaching of copper and tellurium - pyromelting, blowing - silver electrolysis - silver anode slime recovery of gold". , The gold content is low, generally containing 0.6% silver and about 40g / t gold (hereinafter referred to as low-silver smelting slag). The low-silver smelting slag has a large amount and low content, and cannot continue to be returned to the furnace for treatment, thereby reducing the direct recovery rate of gold and silver in the entire production process. [0003] Ball milling-flotation method is used to recover gold and silver in low-silver smelting slag in the domestic existing technology. The tailings after flotat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/00C22B13/00
CPCC22B7/04C22B11/044C22B13/045Y02P10/20
Inventor 马玉天吴建明杜彦君陈治毓张燕贾晓东
Owner JINCHUAN GROUP LIMITED
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