Method for strengthening and enriching noble metal during synergetic reduction smelting of copper-based solid wastes

Abstract

The invention discloses a method for strengthening and enriching noble metal during synergetic reduction smelting of copper-based solid wastes. The method comprises the following steps that sodium pyroantimonate and starch are mixed and granulated, then the copper-based solid wastes are mixed with the sodium pyroantimonate and the starch, the content of antimony and copper in mixture is controlledin a required range; and the mixture, flux and coke are added into a smelting furnace, oxygen-enriched air are introduced into the smelting furnace at a high temperature for reduction smelting, Sb (V) in the sodium pyroantimonate is reduced by the starch to metal and reacts with the noble metal in the copper-based solid wastes and then is enriched in crude copper, and the smelting slag is subjected to beneficiation treatment. According to the core of the method, by means of the property that sodium pyroantimonate is low in high temperature volatility and easy to reduce by starch, the sodium pyroantimonate is reduced to metal antimony in a synergistic reduction smelting process and is combined with the noble metal into an antimony alloy; the antimony alloy is soluble in the crude copper toa certain extent, so that the antimony alloy is preliminarily enriched in the crude copper; and finally, the purpose of efficiently enriching the noble metal in the synergetic reduction smelting process of the copper-based solid wastes is achieved. The method has the advantages of being high in raw material adaptability, high in noble metal recovery rate and simple in technological process.

Description

technical field [0001] The invention relates to a pyrometallurgical process in the field of nonferrous metallurgy, in particular to a pyrometallurgical method for strengthening and enriching precious metals in a copper-based solid waste synergistic reduction smelting process. Background technique [0002] Based on the excellent physical and chemical properties of copper, it is widely used in various fields such as electrical, defense industry, light industry, machinery manufacturing and construction. It is second only to aluminum in the consumption of non-ferrous metal materials in my country. At present, the proportion of copper use is roughly as follows: 48-49% in the electrical industry, 19-20% in the communication industry, 14-16% in construction, 7-10% in transportation, and 7-9% in home appliances and others. Due to the growth of the global economy, the demand for copper has increased significantly, and the world production and consumption have basically remained the s...

AI Technical Summary

Problems solved by technology

In contrast, in the complex copper-based multi-metal solid waste collaborative smelting process, the raw materials are more complex than copper concentrate, so how to ensure the efficient enrichment and separation of rare and precious metals? In the process of synergistic reduction of copper-based solid waste to smelt blister copper, although copper can capture gold in copper-based solid waste, due to the high melting point of copper-gold alloy, it is very unfavorable for the settlement of gold particles in copper-based solid waste

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