Inorganic Chemicals Industry >
Study on technological conditions of polymeric calcium magnesium phosphate fertilizer from phosphoric acid activated phosphate tailings
Received date: 2019-08-17
Online published: 2020-02-26
In order to reduce the environmental damage caused by phosphorus tailings,the synthesis of polymeric calcium magnesium phosphate fertilizer from phosphorus tailings by high temperature intermolecular dehydration polymerization was studied.Phosphoric acid and phosphorus tailings were mixed at the amount-of-substance ratio of P2O5 to（CaO+MgO） of 1∶（1.2~1.8）,and the slurry was calcined at 250~600 ℃ for 1~5 h to obtain dry-base products.The results showed that the degree of polymerization of polymeric calcium magnesium phosphate fertilizer was 1~4,the polymerization rate of P2O5 was more than 80%,the total P2O5 was 50%~60%（mass fraction）,the mass fraction of CaO was about 17%,the mass fraction of MgO was about 12%,and the product structure was porous spherical structure.The product can be flexibly adjusted according to the needs of different regions to obtain products of different properties.The research has been put into trial production in pilot plant,and the formal production workshop is currently being constructed in Guizhou,China,with a target capacity of 200 kt/a.
Jianguo Zheng , Nanshu Yu , Yongxiu Liu , Tao Song , Zhaoping Hu . Study on technological conditions of polymeric calcium magnesium phosphate fertilizer from phosphoric acid activated phosphate tailings[J]. Inorganic Chemicals Industry, 2020 , 52(2) : 43 -46 . DOI: 10.11962/1006-4990.2019-0117
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