Direct synthesis of single-phase α-CaSO4·0.5H2O whiskers from waste nitrate solution

doi:10.1016/j.cjche.2020.04.005

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (6): 1752-1754.DOI: 10.1016/j.cjche.2020.04.005

Direct synthesis of single-phase α-CaSO₄·0.5H₂O whiskers from waste nitrate solution

Shuang Shao^1,2, Baozhong Ma^1,2,3, Yongqiang Chen^1,2, Wenjuan Zhang^1,2, Bao Liu^1,2, Peng Xing^1,2, Chengyan Wang^1,2

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3 Department of Materials Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada

Received:2020-02-29 Revised:2020-04-02 Online:2020-07-29 Published:2020-06-28
Contact: Baozhong Ma, Chengyan Wang
Supported by:
This work was supported by the Beijing Natural Science Foundation of China (2182040), the National Natural Science Foundation of China (51674026, U1802253), the Fundamental Research Funds for the Central Universities (FRF-TT-19-001), and the China Scholarship Council (201906465004).

Direct synthesis of single-phase α-CaSO₄·0.5H₂O whiskers from waste nitrate solution

Shuang Shao^1,2, Baozhong Ma^1,2,3, Yongqiang Chen^1,2, Wenjuan Zhang^1,2, Bao Liu^1,2, Peng Xing^1,2, Chengyan Wang^1,2

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3 Department of Materials Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada

通讯作者: Baozhong Ma, Chengyan Wang
基金资助:
This work was supported by the Beijing Natural Science Foundation of China (2182040), the National Natural Science Foundation of China (51674026, U1802253), the Fundamental Research Funds for the Central Universities (FRF-TT-19-001), and the China Scholarship Council (201906465004).

Abstract

Abstract: Single-phase α-CaSO₄·0.5H₂O whiskers were directly synthesized from waste Ca(NO₃)₂ solution using a hydrothermal method, and HNO₃ was synchronously regenerated. The effects of reaction temperature and Ca²⁺ concentration on the phase composition and morphology of products were determined by X-ray diffraction and optical microscopy. On the basis of the experimental results, the formation diagram of α-CaSO₄·0.5H₂O was plotted within the range of 5-35 g·L^-1 Ca²⁺ and 115℃-150℃. In addition, the conditions of the direct synthesis of α-CaSO₄·0.5H₂O were determined. Well-crystallized, single-phase α-CaSO₄·0.5H₂O whiskers with high aspect ratios (length, 1785 μm; diameter, 10.63 μm; aspect ratio, 168) and HNO₃ (70.25 g·L^-1) were obtained at the optimal conditions of 25 g·L^-1 Ca²⁺ and 125℃.

Key words: α-CaSO₄·0.5H₂O whiskers, Direct synthesis, Formation diagram, Waste Ca(NO₃)₂ solution, HNO₃ regeneration

摘要： Single-phase α-CaSO₄·0.5H₂O whiskers were directly synthesized from waste Ca(NO₃)₂ solution using a hydrothermal method, and HNO₃ was synchronously regenerated. The effects of reaction temperature and Ca²⁺ concentration on the phase composition and morphology of products were determined by X-ray diffraction and optical microscopy. On the basis of the experimental results, the formation diagram of α-CaSO₄·0.5H₂O was plotted within the range of 5-35 g·L^-1 Ca²⁺ and 115℃-150℃. In addition, the conditions of the direct synthesis of α-CaSO₄·0.5H₂O were determined. Well-crystallized, single-phase α-CaSO₄·0.5H₂O whiskers with high aspect ratios (length, 1785 μm; diameter, 10.63 μm; aspect ratio, 168) and HNO₃ (70.25 g·L^-1) were obtained at the optimal conditions of 25 g·L^-1 Ca²⁺ and 125℃.

关键词: α-CaSO₄·0.5H₂O whiskers, Direct synthesis, Formation diagram, Waste Ca(NO₃)₂ solution, HNO₃ regeneration

Shuang Shao, Baozhong Ma, Yongqiang Chen, Wenjuan Zhang, Bao Liu, Peng Xing, Chengyan Wang. Direct synthesis of single-phase α-CaSO₄·0.5H₂O whiskers from waste nitrate solution[J]. Chinese Journal of Chemical Engineering, 2020, 28(6): 1752-1754.

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Direct synthesis of single-phase α-CaSO₄·0.5H₂O whiskers from waste nitrate solution

Direct synthesis of single-phase α-CaSO₄·0.5H₂O whiskers from waste nitrate solution

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