Optimization of the wash process and wash water recycling in the preparation of MgZnAl–CO3 layered double hydroxides--颗粒学报PARTICUOLOGY

Jia, X., Li, D., Evans, D. G., & Lin, Y. (2010). Optimization of the wash process and wash water recycling in the preparation of MgZnAl–CO3 layered double hydroxides. Particuology, 8(3), 231-233. https://doi.org/10.1016/j.partic.2010.03.005

Optimization of the wash process and wash water recycling in the preparation of MgZnAl–CO₃ layered double hydroxides

Xuefei Jia, Dianqing Li, David G. Evans, Yanjun Lin^*

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

10.1016/j.partic.2010.03.005

Volume 8, Issue 3, June 2010, Pages 231-233

Received 16 February 2009, Accepted 27 May 2009, Available online 29 March 2010.

E-mail: linyj@mail.buct.edu.cn

Highlights

Abstract

An MgZnAl–CO₃ layered double hydroxide (LDH) slurry with Na₂SO₄ as the by-product has been prepared by a co-precipitation method. The filtrates in the LDH washing process were collected according to their different levels of salinity. Filtrates with lower salinity can be used to wash a LDH slurry with higher salinity in the next cycle. Only in the final stages is pure water used. Recycling of the wash water in this way has been employed in a commercial production process, resulting in a water-saving of over 80%. The resulting MgZnAl–CO₃–LDH product has a well-formed crystalline layered structure with a low content of impurities.

Graphical abstract

Keywords

Layered double hydroxide; Wash water recycling; Water-saving

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