稀土石膏常压酸化法制备硫酸钙晶须的研究

doi:10.11962/1006-4990.2019-0491

Abstract

Abstract:

Calcium sulfate whiskers were synthesized by atmospheric pressure acidification using rare earth-containing gypsum as raw material.The effects of different process conditions on the morphology of the formed calcium sulfate whiskers were investigated.At the same time,the effects of the type of crystal growth promoter and the content of crystal growth promoter on the growth of calcium sulfate whiskers were also investigated.The surface morphology and phase characteristics of calcium sulfate whiskers were characterized by SEM and XRD,respectively.The experimental results showed that the optimal reaction conditions for preparing calcium sulfate whiskers were rare earth gypsum mass concentration of 0.22 g/mL,reaction time of 25 min,hydrochloric acid concentration of 2.8 mol/L,reaction temperature of 70 ℃ and aging time of 4 h.The average length of the calcium sulfate whiskers synthesized under these conditions was 61 μm,and the average aspect ratio was 30.5. CuCl₂ was selected as a growth promoter for promoting the growth of calcium sulfate whiskers by contrast experiments.With the addition of 5%（mass fraction） CuCl₂,the aspect ratio of calcium sulfate whisker was increased from 30.5 to 41,and the length was increased from 61 μm to 81 μm.

Key words: rare earth gypsum, atmospheric pressure acidification, calcium sulfate whisker, crystal growth promoter

CLC Number:

TQ125.14

Xu Wei,Li Mei,Zhang Dongliang,Gao Kai,Li Jianfei. Study on preparation of calcium sulfate whisker by atmospheric pressure acidification using rare earth gypsum[J]. Inorganic Chemicals Industry, 2020, 52(8): 66-71.

Figures/Tables 15

References 22

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水平	因素
水平	A 反应温度/ ℃	B 反应时间/ min	C ρ（反应物）/ （g·mL^-1）	D c（盐酸）/ （mol·L^-1）	E 陈化时间/h
1	65	15	0.16	2.8	3.5
2	70	20	0.18	3.0	4.0
3	75	25	0.20	3.5	4.5
4	80	30	0.22	4.0	5.0

序号	因素					长径比
序号	A	B	C	D	E	长径比
1	1	1	1	1	1	18.1
2	1	2	2	2	2	19.0
3	1	3	3	3	3	23.2
4	1	4	4	4	4	24.0
5	2	1	2	3	4	20.0
6	2	2	1	4	3	25.0
7	2	3	4	1	2	30.5
8	2	4	3	2	1	28.0
9	3	1	3	4	2	24.0
10	3	2	4	3	1	24.8
11	3	3	1	2	4	23.9
12	3	4	2	1	3	22.8
13	4	1	4	2	3	25.6
14	4	2	3	1	4	25.3
15	4	3	2	4	1	24.9
16	4	4	1	3	2	23.8
K₁	21.075	21.925	22.700	24.050	23.950
K₂	25.750	23.525	21.675	24.125	24.200
K₃	23.875	25.500	25.125	22.950	24.150
K₄	24.900	24.650	26.100	24.475	23.300
R	4.675	3.575	4.425	1.525	0.900

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of calcium sulfate whisker by atmospheric pressure acidification using rare earth gypsum

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