Secondary lead smelting method

Abstract

The invention discloses a secondary lead smelting method which comprises the following steps: crushing scrap lead storage batteries, pre-desulfurizing, and separating to obtain lead plaster; and drying the lead plaster in a drying kiln, smelting in a lead plaster smelting furnace, treating the generated flue gas to obtain waste gas, and meanwhile, returning the waste gas into the drying kiln as a drying heat source. The hot waste gas obtained by waste heat recovery of the lead plaster smelting furnace and lead grid smelting furnace is used as the heat source for drying the lead plaster, thereby being beneficial to the smelting reaction of the lead plaster, enhancing the production efficiency and lowering the energy consumption; smoke dust obtained by treating the high-temperature flue gas generated in the lead plaster smelting furnace and lead grid smelting furnace is returned into the lead plaster smelting furnace to implement utilization of waste, and meanwhile, smelting slag generated by lead grid smelting and refining slag generated by refining also return to the lead plaster smelting furnace for treatment; and the complete treatment system has the advantages of high direct yield, low comprehensive energy consumption and low pollution, and implements optimized configuration of effective resources.

Description

technical field [0001] The invention relates to a method for smelting regenerated lead, in particular to the smelting of various regenerated lead raw materials such as waste lead-acid batteries. Background technique [0002] At present, the production process of secondary lead includes pyrometallurgy process, solid-phase electrolytic reduction process and wet smelting process. Among them, pyrometallurgy process is more commonly used, but there is a problem that the desulfurization lead paste has high moisture content, and the lead paste enters the melting furnace kiln. The smelting cycle is long, the direct yield is low, and the comprehensive energy consumption is high. Contents of the invention [0003] Purpose of the invention: the purpose of the invention is to provide a secondary lead smelting method that can improve production efficiency and recovery rate and reduce comprehensive energy consumption. [0004] Technical solution: The secondary lead smelting method desc...

AI Technical Summary

Problems solved by technology

[0002] At present, the production process of secondary lead includes pyrometallurgy process, solid-phase electrolytic reduction process and wet smelting process. Among them, pyrometallurgy process is more commonly used, but there is a problem that the desulfurization lead paste has high moisture content, and the lead paste enters the melting furnace kiln. Long smelting cycle, low direct yield, high comprehensive energy consumption, etc.

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