硝磷酸氨法净化生产磷酸二氢铵工艺研究

doi:10.19964/j.issn.1006-4990.2022-0686

Abstract

Abstract:

In view of the problem that phosphogypsum would be by-produced in the process of producting ammonium dihydrogen phosphate by wet phosphoric acid by sulfuric acid method，an ammonia neutralization process to produce industrial grade ammonium dihydrogen phosphate based on the purification liquid after deep decalcification and denitrification of frozen mother liquor by nitric acid method was used，and the effects of reaction temperature，phosphoric acid concentration，reaction time，stirring rate，pH，impurity ion concentration and other factors on the ammonia neutralization process were systematically studied，and the results showed that phosphate precipitation generated by impurity ions in the process of ammonia neutralization affected phosphorus yield.And the impurity ions were mainly affected each other by forming complex salt precipitation.By comparing the composition of the filtrate after ammonia neutralization，it could be concluded that the best process conditions were：P₂O₅ concentration was 15%，reaction temperature was 85 °C，stirring rate was 250 r/min，reaction time was 40 min，pH was 4.3，and finally the ammonium dihydrogen phosphate product prepared under the best process conditions met the requirements of the first-class product standard.

Key words: ammonium dihydrogen phosphate, nitric acid, phosphorus yield, ammonia neutralization

CLC Number:

TQ126.3

YUAN Jinghua, WU Junhu, YANG XiuShan, XU Dehua, ZHANG Zhiye. Research on process of production ammonium dihydrogen phosphate by ammonia purification of nitro-phosphoric acid[J]. Inorganic Chemicals Industry, 2023, 55(9): 50-56.

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成分	w（P₂O₅）	w（N）	w（CaO）	w（Al₂O₃）	w（Fe₂O₃）	w（MgO）
冷冻母液	16.87	9.24	0.19	0.45	0.53	0.73
脱硝母液	39.41	2.97	0.42	0.97	1.03	1.58

	w（P₂O₅）	w（F）	w（CaO）	w（Fe₂O₃）	w（MgO）	w（Al₂O₃）	w（SiO₂）
滤饼	29.3	5.72	9.57	3.82	2.93	4.41	3.74
滤液	6.37	—	0.042	0.032	—	—	—

	各组分质量分数/%								pH
	磷酸二氢铵	P₂O₅	总氮	SO₄^2-	F	As	水	水不溶物	pH
1^#	98.78	60.92	12.29	0.14	＜0.001	—	0.3	0.021	4.45
2^#	98.91	61.00	12.37	0.11	＜0.001	—	0.3	0.016	4.47
HG/T 4133-2020《工业磷酸二氢铵》一级	≥98.5	≥60.80	≥11.80	≤0.90	≤0.020	≤0.005	≤0.5	≤0.100	4.2~4.8

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Research on process of production ammonium dihydrogen phosphate by ammonia purification of nitro-phosphoric acid

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