Title: Method of producing ammonium magnesium phosphate fertilizer with medium
Application Number: 88105871 Application Date: 1988.02.10
Publication Number: 1034913 Publication Date: 1989.08.23
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C05B11/04,C05C13/00
Applicant(s) Name: Chengdu Science and Technology Univ. Address:
Inventor(s) Name:
Attorney & Agent: LE QUANQUAN
Abstract:
     Using phosphorous ore which contains more than 10% of CO2, 4-6% of MgO and P2O5 under 25% as raw materials, the extracted phosphoric acid obtained from the technological process is mixed with sulfuric acid, then magnesium is separated, and the solid phase material obtained from the separation of magnesium is used to make phosphoric acid with the conventional dihydrate process. The clear solution obtained can be directly concentrated in a concentrator made of alloy steel to obtain P2O5 of 35-38% concentration. Ammonia gas is then forced into it unitl pH=5.5-7.0, and solid ammonium magnesium phosphate fertilizer is obtained. The above mentioned compounded fertilizer can also be made by the method of twice neutralization. The technological process of this invention is simple and easy to operate. Energy consumption is lowered, the cost is low and there is no waste. Besides, the conventional technological equipment can be used directly for production this invention is particularly..........
Time: 6