用“冷分解-筛分法”生产氯化钾的新工艺研究

doi:10.11962/1006-4990.2020-0080

Abstract

Abstract:

Aiming at the shortage and potential of the common used process for producing potassium chloride in Chinese salt chemical industry currently,a new technology named cold-secomposition-aieving was designed to decrease investment cost and avoid chemical residue.Experiment results showed that after the raw carnallite ores with the particle diameter above 0.246 mm from Chaerhan Salt Lake and Dalangtan Salt Lake decompose at ambient temperature the mean particle diameter of potassium chloride was about 0.1 mm,the optimal result was discovered through serial experiments of screening mesh num-ber,when the mesh size of 0.246 mm was chosen,the yield of potassium chloride was 81.0%,the separation rate of sodium chloride was 88.8% and the sodium chloride dissolved in the decomposition solution was 6.6%.It was proved that the new process of cold-secomposition-aieving method is feasible in the experiment.

Key words: carnallite, potassium chloride, cold-secomposition-aieving method, crystal granularity

CLC Number:

TQ131.13

Chen Mo,Sha Zuoliang. Study on new process for producing potassium chloride using cold-decomposition-sieving method[J]. Inorganic Chemicals Industry, 2021, 53(1): 65-67.

Figures/Tables 4

References 11

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项目	w（水不溶物）	w （KCl）	w （MgSO₄）	w （MgCl₂）	w （NaCl）	w （CaSO₄）
察尔汗	2.81~ 6.68	15.27~17.79	—	18.27~19.91	35.48~40.61	1.39~1.73
大浪滩	—	18.95~20.45	3.77~4.83	25.89~26.01	13.92~15.01	—

筛分孔径/mm	察尔汗盐湖样本质量/g	大浪滩盐湖样本质量/g	筛分孔径/mm	察尔汗盐湖样本质量/g	大浪滩盐湖样本质量/g
1.651	424.1	920.3	0.246	249.9	0.0
1.168	220.2	67.8	0.175	0.0	0.0
0.833	105.8	11.9	合计	1 000.0	1 000.0

实例编号	筛分孔径/mm		光卤石										粗钾
实例编号	筛分孔径/mm		w（水不溶物）/%	w （KCl）/%		w （MgSO₄）/%		w （MgCl₂）/%		w （NaCl）/%		w （CaSO₄）/%	w（水不溶物）/%		w （KCl）/%		w （MgSO₄）/%		w （MgCl₂）/%	w （NaCl）/%	w （CaSO₄）/%
1	1.651		2.81	15.27		—		18.91		40.61		1.73	—		35.38		—		7.17	55.24	2.21
2	0.833		—	18.95		4.83		26.01		15.01		—	—		86.62		1.85		7.79	3.74	—
3	0.382		2.81	15.27		—		18.91		40.61		1.73	—		78.81		—		5.22	13.73	2.24
4	0.246		6.68	17.79		—		18.27		35.42		1.39	—		86.35		—		5.07	7.06	1.53
5	0.175		-	20.45		3.77		25.89		13.92		—	—		88.88		1.45		5.59	4.08	—
实例编号		理论加水量/mL			实际加水量/mL		KCl固相质量/g		KCl取得率/%		NaCl固相质量/g			NaCl分离率/%		尾液体积/mL		尾液w（NaCl）/%
1		930			1 100		*		*		*			*		*		*
2		1 040			1 000		770		88.0		410			80.0		2 200		13.2
3		930			1 100		570		77.5		1 200			87.3		1 800		5.4
4		880			1 100		645		81.0		1 060			88.8		1 900		6.6
5		1 038			1 000		745		87.8		370			77.0		2 200		16.9

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Study on new process for producing potassium chloride using cold-decomposition-sieving method

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