由盐酸法浸出磷矿的氯化钙溶液制备CaSO4·2H2O晶须

doi:10.11962/1006-4990.2020-0006

Abstract

Abstract:

A method was established for preparing calcium sulfate dehydrate whiskers under normal pressure and low tem-perature conditions（T<90 ℃） using the intermediate by-product CaCl₂ from the leachate of phosphate ore by hydrochloric acid as raw material.The effects of different crystal shape control agents on the morphology and aspect ratio of the calcium sulfate whiskers were investigated and the samples prepared were characterized by FESEM and XRD.DTAB was selected as the more suitable crystal form control agent.The conditions of DTAB dosage,reaction temperature and concentration of Ca²⁺etc. were optimized.The optimum process conditions were determined as follows:DTAB dosage was 3%,reaction temperature was 90 ℃,the concentration of Ca²⁺ was 0.1 mol/L,reaction time was 25 min,and the amount-of-substance ratio of calcium to sulfur 1:1.1.Under the conditions,the L/D ratio of as-prepared calcium sulfate whiskers achieved 130.The obviously enhanced intensity of the（020） and（040） crystal planes in X-ray diffraction patterns of the whiskers sample showed preferential gro-wth along the normal direction of the（040） crystal plane.The action mechanism of the crystal shape controlling agent was preliminarily discussed based on the spiral growth theorem.

Key words: calcium sulfate dihydrate, whiskers, calcium chloride solution, phosphate ore

CLC Number:

TQ132.32

Zhang Dongxue,Yang Baojun,Chen Yujia,Wang Bainian,Shao Zongqi. Preparation of calcium sulfate dihydrate whiskers from leachate of phosphate ore by hydrochloric acid[J]. Inorganic Chemicals Industry, 2020, 52(11): 37-42.

Figures/Tables 14

References 24

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DTAB用量/%	长径比	DTAB用量/%	长径比
1	1~10	4	10~15
2	5~15	5	5~10
3	10~20

反应温度/℃	长径比	反应温度/℃	长径比
60	10~15	90	30~40
70	10~20	100	10~15
80	20~25

c（钙离子）/ （mol·L^-1）	长径比	c（钙离子）/ （mol·L^-1）	长径比
0.1	70~80	0.4	30~40
0.2	50~60	0.5	20~30
0.3	35~40

反应时间/min	长径比	反应时间/min	长径比
15	70~80	45	30~40
25	120~130	55	20~30
35	60~70

钙硫比	长径比	钙硫比	长径比
1:0.9	70~80	1:1.2	40~50
1:1	90~100	1:1.3	30~40
1:1.1	120~130

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of calcium sulfate dihydrate whiskers from leachate of phosphate ore by hydrochloric acid

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