Volume 8 Issue 3
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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