Wet-process cleaning treatment method of lead plaster

Abstract

The invention discloses a wet-process cleaning treatment method of a lead plaster. The method comprises the following steps that an acetate solution is taken as a coordination leaching agent to carryout coordination leaching on the lead plaster to obtain lead-containing leachate and leached residues; the leachate is used for extracting the lead by adopting a diaphragm electrodeposition technologywithout purifying; after the diaphragm electrolysis is completed, an negative electrode obtains more than 99.9% or above of the lead, an anode liquid and a cathode electrolysis barren solution can becombined and can be returned to serve as the coordination leaching agent, so that a closed cycle of a technological process is realized; according to the method, the lead plaster in a waste lead-acidstorage battery can be carried out efficient cleaning treatment, an electric lead product with relatively high purity can be directly obtained, and sulfur in the lead plaster is fixed in the leachingslag by a form of insoluble sulfate; according to the method, the technical scheme has the outstanding advantages of being high in raw material adaptability, simple in the technological process, highin valuable element recovery rate, clean and environment-friendly.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for wet cleaning treatment of lead plaster. Background technique [0002] In the lead consumption structure, the lead consumption of lead-acid batteries accounts for about 85% of the total lead consumption. The output of lead-acid batteries in my country accounts for about 1 / 3 of the world's output, and more than 1.5 million tons of batteries are scrapped every year, forming a huge renewable lead resource. [0003] Waste lead-acid batteries usually contain 11% to 30% waste electrolyte, 24% to 30% lead or lead alloy grid, 30% to 40% lead paste and 22% to 30% organic matter. Among them, the lead paste is mainly a slurry-like substance formed after the active material on the plate is charged and discharged, mainly composed of PbSO 4 (about 50%), PbO 2 (about 28%), PbO (about 9%) and Pb (about 4%), etc., usually also contains a small amount of Sb (about 0.5%). ...

AI Technical Summary

Problems solved by technology

But usually the conversion is not complete, generally there will be about 5% PbSO 4 Remains in the converted lead paste, which will produce SO during smelting 2

The pyrometallurgical process of lead paste not only consumes a lot of energy, but also easily produces SO 2 , volatile lead dust and other air pollutants, the cost of smelting flue gas treatment is high; the wet recovery process is currently the most common lead paste treatment method, mainly based on Na 2 CO 3 or NaHCO 3 As a desulfurizing agent, the PbSO in the lead paste was mixed under strong stirring conditions 4 Convert to PbCO 3 , and then roast it to obtain yellow lead (PbO) or mix it with fluorosilicic acid system and electrolyze it to obtain lead powder

However, practice has proved that the wet treatment process of lead paste also has problems such as low conversion rate, large amount of wastewater discharge, and easy release of toxic and harmful gases such as HF during electrolysis.