大颗粒氯化钾聚结结晶及其粒径控制

doi:10.19964/j.issn.1006-4990.2020-0532

Abstract

Abstract:

The solubility of potassium chloride in water was measured by focused reflection beam measurement（FBRM）.The preparation of KCl particle crystals and its particle size control rule under speed of 250 r/min were studied.The effects of con-sumption of primary particles,cooling rate and supersaturation on the coalescence of KCl in solution at this speed were inves-tigated.The results showed that: the solubility of potassium chloride increased with the increase of temperature;the faster the cooling rate led to the greater the instantaneous supersaturation of solution,the easier nucleation led to produce more parti-cles;when the optimal addition amount of primary particles was 0.05~0.1 g in 100 mL solution,the average particle size of the prepared crystal could reach 1 900~2 000 μm and the product had moderate particle size and good sphericity.

Key words: large particles of potassium chloride, coalescence crystallization, primary particles, cooling rate, supersaturation

CLC Number:

TQ131.13

Wan Junfeng,Dong Weibing,Chen Xulong,Du Jingling,Wang Gang. Coalescence crystallization of large particle KCl and its particle size control[J]. Inorganic Chemicals Industry, 2021, 53(8): 50-54.

Figures/Tables 8

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References 23

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温度/℃	溶解度/（10² g·g^-1）
温度/℃	w₁	w₂	w₃	w
20	34.12	34.95	35.53	34.87
30	37.40	37.08	37.25	37.24
40	41.30	40.50	40.80	40.87
50	43.01	43.93	42.93	43.29
60	45.69	45.88	46.38	45.98
70	48.95	48.83	48.76	48.85

粒径/μm
250~300	0.050 9	0.103 2	1.003 5	5.002 5	10.010 5
180~250	0.055 5	0.100 9	1.009 7	5.004 3	10.014 5
150~180	0.052 3	0.109 5	1.008 1	5.009 1	10.012 1

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Inorganic Acid-Base-Salt Committee of CIESC

Coalescence crystallization of large particle KCl and its particle size control

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