Forcible wet desulphurization process for lead plaster

Abstract

The invention provides a forcible wet desulphurization process for lead plaster. The process comprises the following steps of adding water to stir the lead plaster in a lead plaster stirring tank to dilute the lead plaster into 10 to 30 mass percent ore pulp, pumping 20 cubic meters of ore pulp into a desulphurization stirring tank by using a slurry pump, simultaneously adding Na2CO3 into the desulphurization stirring tank according to the mass ratio of Na2CO3 to PbSO4 of (1-1.2):1, pumping the ore pulp out of the desulphurization stirring tank at the same time of desulphurization stirring, enabling the ore pulp to flow through a forcible desulphurizer, and circulating the ore pulp between the desulphurization stirring tank and the forcible desulphurizer. According to the process, PbCO3 product layers wrapped on the outer surfaces of PbSO4 particles can be crushed through the forcible desulphurizer in a desulphurization process to completely expose PbSO4 in a solution of Na2CO3, so that the efficiency of transformation of PbSO4 into PbCO3 is improved, and the aim of forcible desulphurization is fulfilled; rolling and grinding modes are adopted for crushing large PbSO4 crystalline particles through the forcible desulphurizer, and a supergravity stirring mode is adopted for crushing the large PbSO4 crystalline particles and stirring the ore pulp, so that the aims of crushing the large PbSO4 crystalline particles and accelerating desulphurization transformation are fulfilled.

Description

technical field [0001] The invention relates to a wet-process forced desulfurization process for lead paste, which is used for the desulfurization of lead paste in the recycling process of waste lead-acid batteries. Background technique [0002] With the advancement of science and technology and the improvement of people's living standards, the application of lead-acid batteries involves almost all aspects of people's production and life. However, the waste lead-acid batteries have caused serious pollution to the environment. Therefore, the treatment of waste The environmental protection technology of lead-acid batteries has been paid more and more attention by the country. [0003] The lead paste desulfurization treatment methods of waste lead-acid batteries mainly include fire desulfurization process and wet desulfurization process. Many enterprises in my country that specialize in the treatment of waste lead-acid batteries currently mainly use the traditional pyrotechnic...

AI Technical Summary

Problems solved by technology

Therefore, this treatment process will cause serious environmental pollution and waste of resources. At the same time, the cost of flue gas desulfurization is also high, and it has been gradually replaced by the environmentally friendly wet desulfurization process.

[0004] At present, the lead paste of waste lead-acid batteries in developed countries abroad is Na 2 CO 3 The wet desulfurization process has been successfully implemented, but it is difficult to implement the wet desulfurization process of waste lead-acid battery lead paste in my country. Replace new lead-acid batteries; while some users in my country continue to use lead-acid batteries after aging, such as some car owners who refuse to replace lead-acid batteries when their service life ends, resulting in over-aging of lead-acid batteries and over-aging of lead-acid batteries. PbSO in battery 4 The crystalline particles doubled, and it was reported in the literature that PbSO in overaged lead-acid batteries 4 Crystalline particles than PbSO in lead-acid batteries just reaching the end of their service life 4 The crystalline particles are 2 times to 2.4 times larger, and the larger PbSO 4 Crystalline particles use Na 2 CO 3 During desulfurization conversion, PbSO 4 PbCO will form on the surface of the crystalline particles 3 The crystalline layer will prevent the continuous desulfurization conversion process and reduce the efficiency of the wet desulfurization of the lead paste. There is a domestic enterprise lead paste Na 2 CO 3 The wet desulfurization time exceeds 90 minutes, and the result is that the desulfurization rate does not meet the national environmental protection requirements. The sulfur content of the desulfurization lead paste is higher than 0.6%, or even 2.9%.