氯化钾间歇冷却结晶生长规律及粒度控制实验研究

doi:10.11962/1006-4990.2018-0512

Abstract

Abstract:

The crystal nucleation and growth of potassium chloride（KCl） in the batch cooling were investigated by focused beam reflectometry（FBRM）.The effects of cooling rate on the supersaturation of KCl aqueous solution during cooling,and the relationship between the relevant conditions of seed addition（such as the seed particle size and the addition dosage） and the particle size of the KCl crystal product were studied.Meanwhile,"seed" was produced by crystallization stimulated by direct cooling and was controlled its growth to achieve the purpose of controlling the crystal product size.Results showed that the low supersaturation generated in the programmed cooling process was not easy to cause explosive nucleation under the condition of adding seed,and the addition dosage of seed determined the deviation of the average particle size of the crystal product from the ideal growth model.In addition,the cooling rate was a key factor in determining the particle size of the“seed” obtained by cooling-stimulated crystallization.

Key words: potassium chloride seed, crystal growth, programmed cooling, particle size control

CLC Number:

TQ131.13

Li Zhiqiang,Yang Libin,Sha Zuoliang,Wang Yanfei,Zhu Liang,Zhao Xiaoyu. Experimental research on growth and crystal size control of potassium chloride in batch cooling crystallization[J]. Inorganic Chemicals Industry, 2019, 51(8): 33-36.

Figures/Tables 11

References 12

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L_s/μm	m_s/g
123.7	0.18	0.31	0.43	0.62	1.54	2.81	4.08
215.2	0.77	0.99	1.30	1.77	2.51	3.06	3.77
324.7	0.40	0.82	1.47	2.86	3.67	5.10	8.16

降温方式	临界晶种浓度C_c/（g·g^-1）
降温方式	123.7 μm	215.2 μm	324.7 μm
程序降温	0.021 2	0.048 4	0.080 0
自然降温	0.021 2	0.063 8	0.140 0

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Experimental research on growth and crystal size control of potassium chloride in batch cooling crystallization

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