Production process and device for tetrabasic lead sulfate (4BS)

Abstract

The invention relates to a production process for tetrabasic lead sulfate (4BS). The process includes the following steps that (1) preparation treatment is conducted, specifically, lead which is subjected to a pre-mixing reaction is delivered into a reaction kettle through a shear pump, a sulfuric acid solution is added into the reaction kettle while internal circulation type stirring is conducted, meanwhile, part of compressed air is led into the reaction kettle, after the sulfuric acid solution is added, the shear pump is started, the reaction kettle is heated, after internal and external circulation type uniform stirring, heating is stopped, the shear pump is shut down, internal circulation type stirring in the reaction kettle is maintained, and meanwhile, compressed air is led into the reaction kettle to cool lead slime; and (2) ball milling is conducted, specifically, the lead slime obtained in the step (1) is conveyed into a dry ball mill, heating drying and a ball milling reaction are conducted synchronously, and the 4BS is obtained. The invention further provides a production device for the 4BS. According to the production process and device, the preparation reaction time is short, the formed 4BS is small in grain size, uniform and controllable, and the average grain size of the obtained 4BS is 2 [mu]m or less.

Description

technical field [0001] The invention relates to the field of preparation of lead-acid battery materials, in particular to a production process and equipment of tetrabasic lead sulfate. Background technique [0002] Recently, in the production of lead-acid batteries, in order to prolong the cycle life of the battery, one of the most effective measures is to use a lead paste with a high content of tetrabasic lead sulfate, and the abbreviation of tetrabasic lead sulfate is 4BS, and 4BS as the crystal nucleus The addition of 4BS can control the amount and grain size of the formed 4BS, which overcomes the problem of high-content and large-grain 4BS plate formation, and the battery has excellent discharge performance. [0003] Chinese invention patent 201310281747.4 discloses a preparation method of tetrabasic lead sulfate, including the following steps: A. Weighing the sample, B. Hydrothermal reaction, C. Ball milling, D. Vacuum drying, E. Post-treatment and other steps. The pre...

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Problems solved by technology

[0005] One of purpose of the present invention is to overcome the defective that the above-mentioned four-basic lead sulfate production technique exists, and a kind of production technique of four-basic lead sulfate is provided, by increasing the premixing treatment process before the preparation treatment process, and after the preparation treatment The four-basic lead sulfate is simultaneously dried and ball milled. The whole process is simple and controllable, the reaction time is short, and the particle size of the formed 4BS is small and uniform and controllable. The average particle size of the four-basic lead sulfate is less than 2 μm, which effectively solves the existing Due to the high reaction temperature and long reaction time in the preparation of tetrabasic lead sulfate in the technology, the crystal particles of the reaction product are large and uneven.

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