Study on the Preparation and Morphology of Large Aspect Ratio Calcium Sulfate Whisker

LIANG Xianhong; TAN Qi; ZHANG Chuanxiang; DUAN Yuling

doi:10.13779/j.cnki.issn1001-0076.2017.06.016

2017 Vol. 37, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2017 > 0(6): 87-92, 96

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LIANG Xianhong, TAN Qi, ZHANG Chuanxiang, DUAN Yuling. Study on the Preparation and Morphology of Large Aspect Ratio Calcium Sulfate Whisker[J]. Conservation and Utilization of Mineral Resources, 2017, (6): 87-92, 96. doi: 10.13779/j.cnki.issn1001-0076.2017.06.016

Citation:

LIANG Xianhong, TAN Qi, ZHANG Chuanxiang, DUAN Yuling. Study on the Preparation and Morphology of Large Aspect Ratio Calcium Sulfate Whisker[J]. Conservation and Utilization of Mineral Resources, 2017, (6): 87-92, 96. doi: 10.13779/j.cnki.issn1001-0076.2017.06.016

Study on the Preparation and Morphology of Large Aspect Ratio Calcium Sulfate Whisker

1.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2.
Zhengzhou Institute of Multi-purpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, China; China National Engineering Research Center for Utilization of Industrial Minerals, Zhengzhou 450006, China
3.
China National Engineering Research Center for Utilization of Industrial Minerals, Zhengzhou 450006, China

More Information

Corresponding author: TAN Qi

Received Date: 24 August 2017

Publish Date: 25 December 2017

Abstract

Abstract

Natural gypsum was used as raw material in airtight reactor to prepare hemihydrate calcium sulfate whiskers by hydrothermal method, and SEM was utilized to observe the morphology and aspect ratio. The additive, particle size, hydrothermal temperature, pH, initial slurry concentration and hydrothermal time on the morphology of calcium sulfate whisker were investigated. The results showed that additive increased the solubility of natural gypsum in solution; particle size of raw material affected the dissolution rate of natural gypsum, smaller particles easily reached the supersaturated sate; it's difficult to turn into calcium sulfate whisker when hydrothermal temperature was less than 100 ℃; pH of solution can change the mass fraction of ion, and as pH increased the average diameter of whisker gradually decreased, along with being invalid of the additive of CuCl₂; the higher slurry concentration was, the smaller the space of whisker growth was and the slower ion transport rate was. The optimum conditions for the preparation were as follows: the diameter of raw material was 4 μm with the slurry concentration at 5%, the content of copper chloride was 1.5%, temperature was 120 ℃, pH=5.3, and reaction time was 140 minutes. Then, the calcium sulfate whisker of average diameter 1~2 μm, aspect ratio 160 were obtained.
- natural gypsum /
- hydrothermal /
- calcium sulfate whisker

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