Energy-saving environment-friendly copper-containing sludge smelting method

Abstract

The invention discloses an energy-saving environment-friendly copper-containing sludge smelting method, and belongs to the field of pyrometallurgy. The method is characterized in that copper-containing sludge, lime and powdered coal are proportionally and uniformly mixed, then, black copper and fused slag are obtained through pelletizing, rotary kiln drying sintering and smelting furnace smelting, the black copper and the fused slag are separated in a forehearth, the black copper is sold as a copper smelting raw material, the fused slag serves as a raw material for making cement or bricks after being subjected to water quenching, and smelting smoke is exhausted through a chimney after being processed through cyclone dust collection, cloth bag dust collection, dual-alkali desulfuration and demisting of an electric demister to reach the standard. Heat required by rotary kiln drying sintering is obtained from waste heat of forehearth smoke and smelting furnace smoke preferably, and when waste heat is insufficient, heat is supplemented by burning natural gas, coal gas or heavy oil; heat is supplied to the forehearth by burning the natural gas, the coal gas or the heavy oil, air is preheated and burned with assistance of high-temperature smoke exhausted from the forehearth so that the burning temperature of fuel can be increased. According to the smelting method, energy utilization is sufficient, the fixed investment is small, the occupied area is small, the production operation cost is low, and social, economic and environmental protection benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of pyrometallurgy, and in particular relates to an energy-saving and environment-friendly smelting method for copper-containing sludge. Background technique [0002] There are two main methods for traditional pyrometallurgy of copper-containing sludge in industry. One is to dry the copper-containing sludge in a rotary kiln, and then mix it with pulverized coal, lime (or cement) and water in a certain proportion, and then use it to Bricks are made by a brick making machine, and after natural air drying, black copper and matte are smelted with reducing agent coke, flux limestone and silica in a smelting furnace; the second is that copper-containing sludge is mixed with pulverized coal and lime in a certain proportion After mixing evenly, after drum granulation, shaft kiln drying and sintering, black copper and matte are smelted with reducing agent coke, flux limestone and quartz stone in a smelting furnace; in order to ...

AI Technical Summary

Problems solved by technology

The above two methods have the following disadvantages: both need two sets of dust collection and desulfurization systems, so the floor area and fixed investment are relatively large; If it can’t be used, it needs to add water and mix again before making bricks, so the coal consumption is large; the front bed is heated by electricity, the cost is high, the noise and dust pollution are large when the brick making machine is running, and the production environment is poor; the drying and sintering operation technology of the shaft kiln High requirements, large fluctuations in production indicators, high production and operation costs

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