湿法磷酸净化生产工业磷酸一铵研究

通过对湿法磷酸净化处理制备出工业磷酸一铵，得出了生产工业磷酸一铵的工艺路线和工艺条件。在生产出工业磷酸一铵产品的同时生产副产品农用磷酸一铵。 湿法磷酸经过陈化、脱硫、脱氟、中和、分离，得到磷酸一铵清液，再浓缩、结晶、分离和干燥得到工业磷酸一铵晶体，再把中和液过滤的渣子和析晶液混合浓缩得到粗品磷酸一铵。此法工艺简单，制备的工业磷酸一铵符合HG/T 4133-2010《工业磷酸二氢铵》中规定的Ⅱ类以上产品要求，制得的产品具有纯度高、杂质少的优点，具有较好的社会和经济效益。

Study on preparation of industrial grade MAP by WPA

The industrial monoammonium phosphate（(MAP） could be prepared through wet process phosphoric acid purifi- cation，as well the process route and conditions for the production were obtained.In the production of industrial products，the agricultural monoammonium phosphate was also by-produced.After wet phosphoric acid aging，desulfurization，defluorina- tion，neutralization，and separation，MAP supernatant liquor was obtained.Then through concentration，crystallization，separa- tion，and drying，the industrial monoammonium phosphate crystals were got.Finally，the crude MAP was obtained through mixing the filtered slag of neutralization liquor with the crystallization liquid.The prepared industrial MAP was in line with the above requirements of Class II product quality of Industrial Ammonium Dihydrogen Phosphate Standard，HG/T 4133-2010.This method had advantages of simple process，high quality，and low impurity，which could get better social and economic benefits.