硝酸法磷酸脱氟工艺研究

doi:10.19964/j.issn.1006-4990.2020-0605

Abstract

Abstract:

In view of the problem that the m（P₂O₅）/m（F） of dicalcium phosphate prepared from wet process phosphoric acid by nitric acid method was quite low,the effect of reaction time,reaction temperature,reaction pH,concentration of P₂O₅ and CaO in acidolysis solution on the precipitation rate of P₂O₅ and m（P₂O₅）/m（F） was investigated by batch experiments using chemical precipitation method with calcium salt as defluorination agent.The results showed that the change of reaction time and temperature had little effect on the precipitation rate of P₂O₅ and m（P₂O₅）/m（F） of the solution,but reducing the concen-tration of P₂O₅ and CaO could effectively improve the m（P₂O₅）/m（F） and reduce the precipitation rate of P₂O₅.By comparing the benefits of defluorination solution to prepare feed grade dicalcium phosphate,giving the optimal operation conditions were as follows：reaction temperature was 40 ℃,reaction time was 20 min,concentration of P₂O₅ and CaO was 7.6% and 3.4%,respectively,and neutralization pH was 2.4%.Under these conditions,the m（P₂O₅）/m（F） was above 230,and the precipitation rate of P₂O₅ was less than 30%,and it could provide qualified raw materials for subsequent preparation of feed grade dicalcium phosphate.

Key words: nitric acid, wet process phosphoric acid, precipitation method, defluorination process

CLC Number:

TQ126.35

Su Shu,Xu Dehua,Li Chaorong,Yang Xiushan,Wang Xinlong,Zhang Zhiye. Study on defluorination of phosphoric acid by nitric acid process[J]. Inorganic Chemicals Industry, 2021, 53(9): 24-29.

Figures/Tables 11

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References 19

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酸解液	w（P₂O₅）	w（F^-）	w（CaO）
SJY1（原液）	8.3	0.558	11.5
SJY2	7.4	0.539	10.3
SJY3	6.6	0.446	9.1
SJY4	5.7	0.430	8.0

酸解液编号	脱钙液编号	w（P₂O₅）	w（F^-）	w（CaO）
SJY1	TG0	8.3	0.558	11.5
	TG1	8.3	0.619	9.3
	TG2	8.4	0.634	6.6
	TG3	8.4	0.600	4.0

酸解液编号	脱钙液编号	w（P₂O₅）	w（F^-）	w（CaO）
SJY2	TG0	7.4	0.539	10.3
	TG1	7.4	0.545	7.1
	TG2	7.5	0.559	5.5
	TG3	7.6	0.571	3.4
SJY3	TG0	6.6	0.446	9.1
	TG1	6.7	0.500	7.3
	TG2	6.8	0.512	5.1
	TG3	7.0	0.522	3.0
SJY4	TG0	5.7	0.430	8.0
	TG1	5.8	0.448	6.0
	TG2	5.7	0.454	4.4
	TG3	5.6	0.433	2.2

项目	pH	w（P₂O₅）/%	w（CaO）/%	w（Fe₂O₃）/%	w（Al₂O₃）/%	w（F）/%
酸解液	—	7.5	5.5	0.179	0.246	0.559
脱氟液	1.9	4.9	6.6	0.035	—	0.055
	2.2	3.8	6.0	0.026	—	0.023
	2.4	3.5	5.8	0.027	—	0.126
脱氟渣	1.9	28.3	20.7	7.339	9.080	14.500
	2.2	30.8	28.6	4.129	4.934	11.055
	2.4	31.8	31.5	3.361	3.945	8.426

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on defluorination of phosphoric acid by nitric acid process

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