Preparation method of high-quality lithium dihydrogen phosphate

The invention relates to a preparation method of high-quality lithium dihydrogen phosphate, which comprises the following steps: pretreating a lithium hydroxide raw material, adding phosphoric acid for neutralization reaction, removing impurities, adding deionized water to prepare lithium phosphate slurry, and adding phosphoric acid to synthesize to obtain a liquid lithium dihydrogen phosphate product. The liquid lithium dihydrogen phosphate can be continuously subjected to evaporation concentration, spray drying, deep drying and airflow pulverization to obtain the liquid lithium dihydrogen phosphate. The method is simple in process, easy and safe to operate and low in production cost, and the obtained lithium dihydrogen phosphate product is stable in quality. 一种高品质磷酸二氢锂的制备方法，包括氢氧化锂原料预处理、加磷酸中和反应、除杂后，加去离子水制备磷酸锂浆液，再加磷酸合成得到液态磷酸二氢锂产品。可将液态磷酸二氢锂继续蒸发浓缩、喷雾干燥、深度烘干和气流粉碎，得到液态磷酸二氢锂。本发明工艺简单、操作容易、安全、生产成本低，所得磷酸二氢锂产品质量稳定。