磷酸活化磷尾矿制取聚合态钙镁磷肥的工艺条件研究

doi:10.11962/1006-4990.2019-0117

Abstract

Abstract:

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.

Key words: calcium magnesium phosphate fertilizer, phosphorus tailings, polymer state, waste, new fertilizer

CLC Number:

TQ126.34

Zheng Jianguo,Yu Nanshu,Liu Yongxiu,Song Tao,Hu Zhaoping. 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.

Figures/Tables 11

References 15

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n（P₂O₅）: n（CaO+MgO）	聚合度	聚合率/ %	有效占比/%
n（P₂O₅）: n（CaO+MgO）	聚合度	聚合率/ %	P₂O₅	CaO	MgO
1:1.2	4.3	89.43	97.39	83.44	92.43
1:1.4	3.6	80.15	96.93	80.25	93.31
1:1.8	2.1	67.25	91.01	72.11	90.18

时间/h	水不溶物/%	时间/h	水不溶物/%
1	85.33	36	34.01
12	57.29	48	25.17
24	45.92

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on technological conditions of polymeric calcium magnesium phosphate fertilizer from phosphoric acid activated phosphate tailings

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