Method for preparing tetrabasic lead sulfate

Abstract

The invention relates to a method for preparing tetrabasic lead sulfate. The method comprises the following steps: 1, carrying out a preparation reaction: sending a premixed lead material to a reaction kettle, adding a sulfuric acid solution to the reaction kettle while carrying out uniform cyclic stirring, and introducing compressed air to the reaction kettle to cool in order to obtain lead mud; and 2, carrying out a ball milling reaction: conveying the lead mud obtained in step 1 to a dry ball mill, and synchronously carrying out drying and ball milling treatment to obtain the tetrabasic lead sulfate product. The premixed lead material directly reacts with sulfuric acid, and heat generated in the exothermic reaction of concentrated sulfuric acid is fully used to rapidly heat the reaction kettle, so the preparation reaction time is shortened; and a reaction product is rapidly cooled by the compressed air to further effectively inhibit growth of 4BS crystal particles, so the granularity of the formed 48S is small, uniform and controllable, and the technical problems of large and non-uniform crystal particles of the reaction product, caused by high preparation reaction temperature and long reaction time of the 4BS in the prior art are effectively solved.

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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