Method for smelting lead-containing waste and copper-containing waste synchronously in molten pool

Abstract

This invention provides a method for smelting lead-containing waste and copper-containing waste synchronously in a molten pool. The method comprises the following steps: (1) mixing the lead-containing waste, the copper-containing waste, one or more fluxes and carbon-containing reducing agents and then pelletizing, wherein the ratio of the lead-containing waste and copper-containing waste is controlled to achieve the effect that the mass ratio of (Cu+Fe):S is (1.75-4):1; (2) adding the mixture to the smelting equipment (i.e. the molten pool), wherein the mass ratio of water-quenched slag to the furnace burden (i.e. the mixture) is (0.7-5):1, and the smelting temperature is 1050-1250 DEG C; (3) keeping the smelting temperature for 30-180 min for separating and clarifying lead alloy, copper matte and smelting slag. According to the invention, the method can be used for treating the lead-containing waste and the copper-containing waste synchronously; the process is efficient and simple; the direct recovery rates of lead and copper can reach above 75% respectively; the metal content of the generated slag is low, and the slag can be used as a building raw material; the extraction and separation of lead, copper and other elements in the wastes can be realized through one step; the lead is concentrated in the lead alloy, and the copper is concentrated in the copper matte; the product additional value is high; the subsequent processing is simple.

Description

technical field [0001] The invention belongs to pyrometallurgy in the field of heavy metal pollution control, and in particular relates to a method for synchronously extracting heavy metals from waste materials containing lead and copper. Background technique [0002] Heavy metal waste is mostly leaching slag, slag, sludge, soot, etc. produced in the metallurgical process. Its composition is complex, including copper, nickel, lead, zinc and other valuable metals. According to its main metal composition, it can be divided into Lead-containing scrap, copper-containing scrap, etc. The traditional heavy metal waste treatment method is to prevent the leakage of harmful elements in the waste through solidification and landfill. In recent years, with the increasing requirements for resource recycling, it has gradually become the main development direction of heavy metal waste treatment to adopt targeted metallurgical methods to extract valuable metal elements according to the wast...

AI Technical Summary

Problems solved by technology

However, this method needs to add the matte phase used for slag washing, which can only treat the slag intermittently, with high energy consumption and complicated operation

[0005] To sum up, the current treatment process of lead-containing or copper-containing waste only targets a single lead-containing or copper-containing waste. The treatment process requires the addition of a large number of auxiliary materials or reagents, and produces a large number of low-value by-products, which have high costs. The disadvantages of low efficiency and easy to produce secondary pollution

However, the method of quantitatively coordinating the two waste materials for simultaneous processing has not yet been reported, due to the fact that the components of the two waste materials can interact with each other.

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