聚磷酸钙镁的制备研究

doi:10.19964/j.issn.1006-4990.2021-0773

Abstract

Abstract:

In view of the intractable use of wet?process phosphoric?acid slag and phosphate tailing，a strategy was proposed for preparing calcium magnesium polyphosphate fertilizer via calcining wet?process phosphoric?acid slag and phosphate tailing composites.Based on the decomposition ratio of phosphate tailing，the suitable mass ratio of phosphate tailing and wet?process phosphoric?acid slag was 0.30，and the decomposition ratio was 80.18%.The results of calcination process showed that both increasing temperature and prolonging time promoted the growth of polyphosphate chain.The average?degree of polymerization was increased from 1.00 to 3.23 after calcinating at 105~460 ℃ for 1.0 h.Among them，at 340 ℃ the polymerization rate reached 85%，but the polymerization degree was still increasing.Although the water solubility of fertilizer decreased gradually with the increase of polymerization chain，the available phosphorus content was still more than 90% when the temperature did not exceed 340 ℃.After calcination at 340 ℃ for 1.0~2.0 h，it was found that when calcination time was 1.0 h，the polymerization rate and average degree of polymerization reached 87.4% and 2.80，respectively.Optimizing the processing parameters，the polycondensation could be controlled on the level of polymerization degree distribution，which opened a new direction for the construction of slow-release fertilizer.Polyphosphate containing species with polymerization degree from 1 to 10 could be optimized under the calcination of 340 ℃ for 1.0 h，which resulted with amorphous and porous-structure.The available phosphorus，calcium and magnesium were over 85%（mass fraction），which could be used as a new multi?element slow?release fertilizer.

Key words: wet?process phosphoric?acid slag, phosphate tailing, calcium magnesium polyphosphate, degree of polymerization, resource utilization

CLC Number:

TQ442.33

MIAO Linping,XU Miao,WANG Xinlong,YAN Zhengjuan,XU Dehua,YANG Jingxu. Study on preparation of calcium magnesium polyphosphate[J]. Inorganic Chemicals Industry, 2022, 54(9): 63-68.

Figures/Tables 9

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References 18

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原料	主要成分质量分数/%
原料	P₂O₅	CaO	MgO	SiO₂	Fe₂O₃	Al₂O₃	SO₃	CO₂	SO₄^2-	F
磷尾矿	7.41	32.99	15.35	6.36	0.70	0.57	1.53	31.64	—	0.87
磷酸渣	34.63	2.37	1.34	1.75	0.83	1.48	—	—	5.76	2.98

组成	w（P₂O₅）/%	w（CaO）/%	w（MgO）/%
总养分	52.15	17.12	8.24
水溶养分	5.26	4.96	1.35
有效养分	47.56	14.79	7.31
有效养分占总养分比例	91.21	86.38	88.71

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of calcium magnesium polyphosphate

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