Method for direct low-temperature smelting of waste lead accumulator

Abstract

A method for directly smelting a scrap lead storage battery at low temperature is characterized by comprising the following steps: (1) firstly, the shell of the scrap lead storage battery is removed and plastic, waste acid, slab lattice and gypsum mud are obtained; (2) then, the slab lattice and the gypsum mud with the shell being removed as well as desulfurizer and reducing agent are added into a metallurgical furnace together for low smelting heat, so that soft lead, slag and flue gas are produced; (3) at last, the slag produced by low smelting heat is leached, and leaching dregs and leaching liquid are output by liquid solid separation; the leaching dregs wait to be treated, and the leaching liquid is evaporated and concentrated, so that industrial sodium sulfate is produced. The method does not need the complicated used battery resolving device, a sweetener has small volume, and the course of crystallization of the industrial sodium sulfate has low energy consumption; the method is characterized by low smelting temperature, little lead volatilization, low smoke dust rate, high direct lead yield coefficient, low energy consumption, no sulfur dioxide pollution, etc.

Description

technical field [0001] The invention relates to a production method of regenerated lead, in particular to a method for direct low-temperature smelting of waste lead accumulators for recovering metallic lead from waste lead accumulators by adopting a fire-method lead smelting process, belonging to the technical field of regenerated lead production. Background technique [0002] With the increase of the number of automobiles, the lead-acid battery industry has developed rapidly, and the amount of waste lead-acid batteries produced every year is constantly increasing. In this situation, the governments of various countries strongly support the production of secondary lead and the research on new technologies for the production of secondary lead that recover lead from waste lead-acid batteries. [0003] Lead-containing materials in waste lead-acid batteries include grids and paste. The composition of the grid is lead alloy, which contains as much as 90% to 95% lead; the composi...

AI Technical Summary

Problems solved by technology

[0015] (1) It is necessary to add complex waste battery decomposition equipment to separate the paste and grid;

[0016] (2) It is necessary to add bulky paste desulfurization equipment;

[0017] (3) sodium sulfate concentration in the liquid after desulfurization is too low, and the energy consumption of reclaiming sodium sulfate process is too high;

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