A kind of method of lead sulfate slag wet cleaning treatment

Abstract

The invention discloses a method for wet-process cleaning treatment of lead sulfate slag. The method comprises the following steps that firstly, a chloride solution is taken as a coordination leachingagent, the lead sulfate slag is subjected to chlorination coordination leaching, and a lead chlorination coordination leaching solution and leaching slag are obtained; the leaching solution is subjected to cooling crystallization after immediate hot filtration, then liquid-solid separation is carried out again, and a lead chloride crystal and a crystallized solution are obtained correspondingly;the crystallized solution is reused for the chlorination coordination leaching, and the lead chloride crystal obtained by crystallization is added into an acetate solution system for conversion and leaching; after the leaching solution is converted and leached, the leaching solution is directly used as a cathode solution without purification, and lead is extracted by adopting a diaphragm electrodeposition technology; and after the diaphragm electrodeposition is completed, the negative electrode obtains 99.9% or more of lead, a cathode dilution solution and an anode dilution solution can be returned to the system to be used, and closed loop circulation of the technological process is realized. According to the method, the lead sulfate slag can be subjected to clean and efficient treatment so that a lead product with relatively high purity can be obtained directly, and the method has the outstanding advantages of being high in raw material adaptability, simple in technological process, high in valuable element recovery rate and 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 sulfate slag. Background technique [0002] In the process of zinc hydrometallurgy, a large amount of lead sulfate slag is often produced. In addition, zinc leaching slag, converter soot, iron and steel plant soot, copper smelting soot, etc., after pyro-reduction and volatilization treatment, also contains lead. After sulfuric acid leaching, most of the lead is concentrated in the leaching slag, forming lead sulfate slag. Most of the lead in these lead sulfate slags is PbSO 4 There are physical phases, and the lead content generally ranges from 10 to 50%. It is of great significance to realize its resource utilization, reduction and recycling. [0003] At present, the treatment process of lead sulfate slag can be divided into pyrometallurgy and hydrometallurgy. Pyrometallurgy is mainly to use it as raw material for lead sme...

AI Technical Summary

Problems solved by technology

Therefore, when it is mixed into the furnace and smelted with PbS concentrate, its matching amount is limited, otherwise it will be difficult to maintain the heat balance of the lead smelting system

In addition, the pyrometallurgical process to treat lead sulfate slag 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 relatively higher; the most common treatment method for lead sulfate slag in the wet recovery process is mainly Na 2 CO 3 or NaHCO 3 As a desulfurizer, the PbSO in the lead sulfate slag was mixed under strong stirring conditions 4 Convert to PbCO 3 , and then roast it or mix it with fluorosilicic acid system and electrolyze it to get lead powder

However, practice has proved that the lead sulfate slag wet treatment process 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 of the fluorosilicic acid system.