反应萃取法制备熔盐级硝酸钾工艺探讨

doi:10.11962/1006-4990.2019-0378

Abstract

Abstract:

Reactive extraction method is a low-cost and high-efficiency method for preparing molten salt grade potassium ni-trate.The process of preparing molten salt grade potassium nitrate by potassium chloride and nitric acid was studied.The opti-mal reactive crystallization conditions under laboratory were obtained by parameter optimization.The amount-of substance ra-tio of HNO₃ to KCl was about（1.4~1.5）∶1,the cooling crystallization temperature was at 5~10 ℃ and the cooling crystalliza-tion time was 60 min,the molten salt grade potassium nitrate having a purity greater than 99.4% was obtained by recrystalliza-tion.The nitric acid in the mother liquor can be efficiently extracted by the agent consisting of TBP and sulfonated kerosene at an extraction temperature of 30 ℃,the TBP volume fraction of 30% and an O/A ratio of 5∶1.

Key words: potassium nitrate, reactive crystallization, solvent extraction

CLC Number:

TQ131.13

Su Lei,Zhang Haijun,Wang Jin,Yu Xuefeng,Dong Changji,Sun Ze,Song Xingfu,Yu Jianguo. Study on preparation of molten salt grade potassium nitrate by reactive extraction method[J]. Inorganic Chemicals Industry, 2020, 52(5): 35-39.

Figures/Tables 9

References 17

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项目	w（K⁺）	w（NO₃^-）	w（Cl^-）	w（KNO₃）
1	38.50	61.00	0.026 9	99.47
2	38.50	61.01	0.026 3	99.49
3	38.54	61.08	0.021 4	99.60
4	38.54	61.08	0.021 3	99.60
5	38.51	61.03	0.025 2	99.52
6	38.58	61.15	0.019 2	99.71
7	38.58	61.14	0.019 6	99.70
8	38.60	61.18	0.019 1	99.76

φ （TBP）/ %	质量浓度/（g·L^-1）
	R₁		R₂		W₁		W₂
	NO₃^-	Cl^-	NO₃^-	Cl^-	NO₃^-	Cl^-	NO₃^-	Cl^-
10	139.12	134.55	94.08	140.51	54.24	0.07	10.12	0.02
15	124.36	137.92	67.02	148.24	69.52	0.19	21.15	0.02
20	110.96	143.40	44.70	156.86	80.54	0.17	29.63	0.03
25	97.21	147.10	29.35	160.56	83.08	0.82	36.42	0.05
30	81.43	151.12	17.56	165.40	85.63	1.21	40.66	0.06
35	68.71	154.74	10.60	171.45	88.17	1.74	44.90	0.06
40	57.85	159.78	7.12	172.67	89.87	1.38	47.45	0.06

O/A	质量浓度/（g·L^-1）
	R₁		R₂		W₁		W₂
	NO₃^-	Cl^-	NO₃^-	Cl^-	NO₃^-	Cl^-	NO₃^-	Cl^-
1∶1	92.57	87.80	65.61	90.32	32.45	0.57	5.24	0.02
2∶1	73.15	88.80	36.75	94.07	43.69	0.66	13.08	0.03
3∶1	57.15	89.61	20.30	97.21	50.85	0.82	21.34	0.03
4∶1	46.08	92.17	12.99	96.37	51.53	0.83	25.68	0.04
5∶1	38.41	99.96	7.53	116.27	42.34	1.00	18.61	0.05
6∶1	32.28	104.56	5.07	118.07	47.61	1.26	25.17	0.05

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of molten salt grade potassium nitrate by reactive extraction method

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