Method for implementing full cycle regeneration of waste lead acid batteries

摘要

A method for implementing full cycle regeneration of a waste lead acid battery is provided. The method includes the following steps. Step (1): the waste lead acid battery is smashed and separated so as to obtain grid lead, diachylon, plastic and waste electrolyte. Step (2): the obtained diachylon after being dried is positioned into an airtight reactor for desulphurization and deoxidation, wherein lead sulfate and the lead dioxide both in the diachylon react to obtain lead monoxide (PbO) and sulfur trioxide (SO3). Step (3): the obtained lead monoxide is reduced by solid phase electrolysis in a wet way so that the lead monoxide is reduced into sponge lead.

主权项

1. A method for a full cycle regeneration process of waste lead acid batteries, comprising the following steps:
(1) smashing and separating waste lead acid batteries to obtain grid lead, lead mud and waste electrolyte separately; (2a) smelting, refining and casting the grid lead separated from Step (1) after being washed, to obtain alloy lead ingot; (2b) filter pressing the lead mud obtained from Step (1) to separate solid and liquid, the main element of the separated liquid being waste electrolyte and the separated solid being diachylon; (3a) purifying the waste electrolyte separated from Step (2b) and waste electrolyte obtained from Step (1); (3b) drying the diachylon separated from Step (2b); (4) thermal decomposing the diachylon after being dried in step (3b) in an airtight desulphurization reactor for desulphurization and deoxidation, with the lead sulfate and lead dioxide in the diachylon being decomposed separately into lead monoxide (PbO), and producing sulfur trioxide (SO3) gas; (5a) absorbing the SO3 gas separated from Step (4) with sulfuric acid to obtain concentrated sulfuric acid; (5b) mixing the powder-type lead monoxide obtained in Step (4) with water to obtain a lead monoxide paste; (6) coating the lead monoxide paste obtained in Step (5b) on an electrolysis cathode plate and drying the cathode plate; (7) immersing the cathode plate coated with lead monoxide in Step (6) into an electrolytic bath filled with electrolyte and performing electrolysis at room temperature with direct current supplied to cathode and anode poles to reduce the lead monoxide is reduced into sponge lead; (8) peeling off the sponge lead from the cathode plate; (9) washing the sponge lead obtained in Step (8); (10) smelting, refining and casting the sponge lead after being washed in Step (9) to obtain metal lead.