公开(公告)号：US20210114878A1

公开(公告)日：2021-04-22

申请号：US17033788

申请日：2020-09-26

Applicant: Kunming University of Science and Technology

Inventor： Ping NING ,  Rui CAO ,  Xueqian WANG ,  Senlin TIAN ,  Yixing MA ,  Langlang WANG ,  Yingjie ZHANG ,  Peng CHEN

IPC: C01B25/28 ,  C01F11/46 ,  B01D53/50 ,  B01D53/80 ,  B01D53/73

Abstract: A method for production of ammonium phosphate from phosphate rock slurry. The method includes: introducing flue gas containing SO2 into a phosphate rock slurry, to yield an absorption solution; evaporating waste ammonia water containing 10-20 wt. % ammonia to yield ammonia gas; introducing the ammonia gas into the absorption solution at a temperature of 110-135° C. until a neutralization degree of the absorption solution reaches 1.5-1.6, thus yielding an ammonium phosphate solution and calcium sulfate; separating the calcium sulfate from the ammonium phosphate solution; and introducing the ammonium phosphate solution to a granulator for granulation to yield ammonium phosphate granules; drying and sieving the ammonium phosphate granules, thereby yielding ammonium phosphate.