A method for preparing tetrabasic lead sulfate

Abstract

The invention relates to a method for preparing tetrabasic lead sulfate, which comprises the following steps: A. Prepare the reaction, send the pre-mixed lead material into the reaction kettle, and carry out internal circulation stirring while adding sulfuric acid solution into the reaction kettle After uniformity, feed compressed air into the reaction kettle to cool the lead slime; B. Ball milling reaction, transport the lead slime in step A to a drying ball milling device, and perform drying and ball milling simultaneously to obtain a tetrabasic lead sulfate product. The present invention adopts the method of directly reacting the premixed lead material with sulfuric acid, makes full use of the heat generated by the exothermic reaction of concentrated sulfuric acid to rapidly heat up the reactor, thereby shortening the preparation reaction time, and the reaction product is rapidly cooled by compressed air, further Effectively inhibit the 4BS crystal particles from becoming larger, and the formed 4BS has a small and uniform particle size, which effectively solves the problem in the prior art that the reaction product crystal particles are large and uneven due to the high reaction temperature and long reaction time for the preparation of tetrabasic lead sulfate. technical problem.

Description

technical field [0001] The invention relates to the field of preparation of lead-acid battery materials, in particular to a method for preparing 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 present invention ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the existing defects of the above-mentioned tetrabasic lead sulfate preparation method, provide a kind of method for preparing tetrabasic lead sulfate, adopt the method that the lead material after premixing is directly reacted with sulfuric acid, make full use of concentrated sulfuric acid The heat generated by the exothermic reaction makes the reaction kettle heat up rapidly, thereby shortening the preparation reaction time. The reaction product is rapidly cooled by compressed air, which further effectively inhibits the growth of 4BS crystal particles, and the formed 4BS particle size is small and uniform and controllable, which effectively solves the problem. In the prior art, due to the high reaction temperature and long reaction time in the preparation of tetrabasic lead sulfate, the technical problems of the reaction product crystal particles are large and uneven

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