Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime

邓立聪; 张亦飞; 陈芳芳; 曹绍涛; 游韶玮; 刘艳; 张懿

doi:10.1016/S1004-9541(13)60626-6

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Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime

能源、资源与环境技术 | Updated：2026-01-06

- Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime
- Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime
- 中国化学工程学报（英文版） 2013年21卷第11期页码：1303-13121004-954160626-6
- Affiliations：
  
  2 Graduate University of Chinese Academy of Sciences,Beijing,China,100049
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(13)60626-6
  中图分类号：
- 纸质出版：2013
- Accepted：
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邓立聪, 张亦飞, 陈芳芳, 等. Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime[J]. 中国化学工程学报（英文版）, 2013,21(11):1303-13121004-954160626-6.

DENG Licong, ZHANG Yifei, CHEN Fangfang, CAO Shaotao, YOU Shaowei, LIU Yan, ZHANG Yi. Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime[J]. Chin.J.Chem.Eng., 2013, 21(11): 1303-1312.
邓立聪, 张亦飞, 陈芳芳, 等. Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime[J]. 中国化学工程学报（英文版）, 2013,21(11):1303-13121004-954160626-6. DOI： 10.1016/S1004-9541(13)60626-6.

DENG Licong, ZHANG Yifei, CHEN Fangfang, CAO Shaotao, YOU Shaowei, LIU Yan, ZHANG Yi. Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime[J]. Chin.J.Chem.Eng., 2013, 21(11): 1303-1312. DOI： 10.1016/S1004-9541(13)60626-6.

摘要

Abstract

The present work focused on the recycle of the sulfate and the metal ions from acidic wastewater discharged by nonferrous metallurgical industry. The effects of the temperature

the reactant concentration

the stirring speed and the metal ions on the reactive crystallization process of calcium sulfate between sulfuric acid and lime were systematically investigated. The morphology of the precipitated crystals evolved from platelet-like and needle-like shape to rod-like shape when the temperature was increased from 25 to 70 ℃. An increase in the agglomeration of calcium sulfate was found with increasing lime concentration. Metal ions markedly retard the rate of crystallization of calcium sulfate dihydrate. The crystallization of gypsum was slowed with the existence of Mg

in the solution

and the morphology of gypsum was transformed from platelet-like shape to rod-like shape when Mg

concentration reached 0.08 mol·L

-1

. The amorphous ferric hydroxide was coated on the calcium sulfate after the co-precipitation process while Zn

and Al

ions in the solution enhanced the agglomeration of the calcium sulfate by absorbing on the surface of the crystals. Comprehensive acidic wastewater containing hea

vy metals was efficiently purified by the two stage lime neutralization technology

and highly agglomerated gypsum precipitates with needle-like shape were obtained. The precipitates could be purified by sulfuric acid washing

and the metal ions were effectively separated from the calcium sulfate by-products.

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