关键词: 工业级磷酸二氢铵, 制备工艺, 湿法磷酸

Abstract:

Ammonium dihydrogen phosphate is a typical fine phosphate product,which has a wide range of applications and excellent market prospects in agriculture,fire protection,food,materials and many other fields.With the ever-increasing demand for ammonium dihydrogen phosphate,research on the producing process of industrial grade ammonium dihydrogen phosphate has attracted more and more attention.The main technical routes for the preparation of industrial grade ammonium dihydrogen phosphate include hot-process phosphoric acid route and wet-process purified phosphoric acid route,the hot-pro-cess phosphoric acid route shows high energy consumption,high pollution and high cost,which is gradually restricted,while the route of purifying wet-process phosphoric acid route by solvent extraction to produce industrial grade ammonium dihydro-gen phosphate has high purity,good quality and high degree of automation,but the process is complex,large investment and high cost.Therefore,in recent years,more and more research has been carried out to explore other ways to prepare industrial grade ammonium dihydrogen phosphate.Herein,the technical routes of preparing industrial grade ammonium dihydrogen phosphate from thermal process phosphoric acid,purified wet-process phosphoric acid,wet-process phosphoric acid,raffinate acid and urea phosphate mother liquid were reviewed.The characteristics of each process were discussed in detail.At present,producing high value-added high purity ammonium dihydrogen phosphate from wet-process phosphoric acid is the focus of research which is cheap and easy to obtain.It is urgent for this method to increase the purity of product and P₂O₅ yield,to improve the filtration performance of the slurry and to explore the appropriate reuse methods of filter residues after removing impurities with ammoniation.

Key words: industrial grade ammonium dihydrogen phosphate, preparing process, wet-process phosphoric acid