【摘要】 研究了氟化法制备电池级硫酸锰的生产工艺。通过交叉实验研究了氟化锰加入量、反应时间、反应温度对氟化法除钙镁的影响。通过结晶过程的研究,得到了结晶终点浆料的最佳浓度。结果表明:当氟化锰加入量为22 g/L,反应时间4 h,在室温下进行氟化除杂后,控制结晶终点浆料浓度在1.514～1.563 g/mL,采用一次结晶法即可得到钙、镁质量分数小于50×10^-6,氟质量分数小于70×10^-6的电池级硫酸锰晶体产品。结晶后将母液返回至设备前端循环利用,从而减少了氟化锰的使用量。结合中试研究结果,探讨了对实际生产环节的优化,分析了其经济效益。更多还原

【Abstract】 The production process of preparing battery-grade manganese sulfate by fluorination method was discussed. The effects of manganese fluoride addition, reaction time and reaction temperature on the removal of calcium and magnesium by fluorination were studied by cross-experiment. Through the study of the crystallization process, the optimum concentration of slurry at the end of crystallization was obtained. The results show that when the amount of manganese fluoride added is 22 g/L, the reaction time is 4 h. The fluorination and impurity removal are carried out at room temperature, the crystallization end-point slurry concentration is controlled between 1.514 g/mL and 1.563 g/mL. The primary crystallization method can be used to obtain battery-grade manganese sulfate crystal products with the mass fraction of calcium and magnesium less than 50×10^-6 and fluorine less than 70×10^-6. After crystallization, the mother liquor was returned to the front end of the equipment for recycling. Thereby, it is reducing the amount of manganese fluoride in usages. Combining with the results of the pilot study, the optimization of the actual production links was discussed and its economic benefits were analyzed.更多还原