以浓厚卤水为原料制备半水硫酸钙晶须的研究

doi:10.11962/1006-4990.2019-0312

Abstract

Abstract:

Calcium sulfate hemihydrate whisker with high length/diameterm（L/D） ratio was prepared from high concentration brine abandoned in the production process of sea salt industry.The effects of material concentration,crystal growth promoter concentration,reaction time,reaction temperature and reaction stirring rate on the preparation of calcium sulfate hemihydrate whisker were investigated.The prepared calcium sulfate hemihydrate whisker was characterized and confirmed by powder X-ray diffractometer and scanning electron microscope.Through the orthogonal experimental,the optimum conditions were con-firmed as follows：material mass fraction of 3%,crystal growth aid mass fraction of 3%,reaction time of 7 h,reaction tempera-ture of 130 ℃ and reaction stirring rate of 30 r/min.Under this condition,calcium sulfate hemihydrate whiskers with the L/D ratio of 400 were produced.The technology has the advantages of low production cost,environment friendly and stablity.The prepared calcium sulfate hemihydrate whisker with average L/D ratio of 400 is easy to produce industrially.

Key words: dense brine, Calcium sulfate hemihydrate whiskers, length/diameter（L/D） ratio

CLC Number:

TQ132.32

Tang Na,Hei Yunhao,Wu Tengfei,Xiang Jun,Du Wei,Zhang Lei. Study on preparation of hemihydrate calcium sulfate whisker from dense brine[J]. Inorganic Chemicals Industry, 2020, 52(4): 88-92.

Figures/Tables 10

References 14

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序号	检测项目	检测方法	国标
1	Ca²⁺	滴定法	GB/T 13025.6—2012
2	Na⁺	滴定法	GB/T 13025.8—2012
3	Cl^-	滴定法	GB/T 13025.5—2012
4	SO₄^2-	滴定法	GB/T 13025.8—2012
5	K⁺	滴定法	QB/T 4445—2012
6	Mg²⁺	滴定法	GB/T 13025.6—2012
7	色度	稀释倍数法	GB/T 11903—1989
8	COD	化学需氧量（COD）测定仪	GB/T 32208—2015

水平	因素
水平	A w（物料)/%	B 时间/h	C w（晶型助长剂)/%	D转速/ （r·min^-1）	E 温度/℃
1	2	6	2	30	125
2	3	7	3	60	130
3	4	8	4	90	135

实验号	因素					长径比
实验号	A	B	C	D	E	长径比
1	1	1	3	1	2	98
2	1	3	1	2	2	89
3	2	2	2	1	2	401
4	3	3	3	1	3	81
5	1	1	1	1	1	67
6	2	1	1	3	3	77
7	1	2	1	2	3	71
8	1	1	2	1	3	44
9	1	3	2	3	1	42
10	3	1	1	3	2	56
11	1	2	3	3	1	48
12	2	3	1	1	1	39
13	2	1	3	2	1	25
14	3	2	1	1	1	83
15	3	1	2	2	1	68
16	1	2	2	2	2	168
K₁	627	435	482	813	372
K₂	542	771	723	421	812
K₃	288	251	252	223	273
k₁	78	62	69	116	53
k₂	136	154	145	84	162
k₃	72	63	63	56	68
R	64	92	82	60	109

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Study on preparation of hemihydrate calcium sulfate whisker from dense brine

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