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| Thermodynamics Analysis on Formation of Calcium Arsenate Slag |
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Received:March 25, 2019
Revised:March 27, 2019
Accepted:March 28, 2019
Published Online:August 16, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.09.011 |
| KeyWord:arsenic; calcium salt precipitation; thermodynamics |
| Author | Institution |
| ZHANG Wen-juan |
北京科技大学 冶金与生态工程学院 |
| MA Bao-zhong |
北京科技大学 冶金与生态工程学院 |
| WANG Cheng-yan |
北京科技大学 冶金与生态工程学院 |
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| Abstract: |
| Calcium arsenate (Ca-As) forms during arsenic precipitation with calcium salt or migration of groundwater. According to thermodynamic calculation, equilibrium diagrams of Ca2+-AsO43--H2O system were established at 25 ℃. Effect of Ca/As mole ratio on phase composition of precipitate and precipitation was investigated. The results indicate that four solid phases, CaHAsO4?H2O(s), Ca3(AsO4)2?4H2O(s), Ca5(AsO4)3OH and Ca4(OH)2(AsO4)2?4H2O(s), are generated at 0 |
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