Environment·Health·Safety

Study on the process of preparing liquid salt of guaranteed reagent by dissolving two-layer salt in ammonia-alkali wastewater

  • Runpu Wang ,
  • Wei Du ,
  • Kaibao Hu ,
  • Zhanhe Wang ,
  • Weixing Gao ,
  • Na Tang
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  • 1. College of Chemical Engineering and Materials Science,Tianjin University of Science & Technology,Tianjin 300457,China
    2. Inner Mongolia Lantai Industry Co.,Ltd

Received date: 2020-09-08

  Online published: 2021-08-11

Abstract

In view of the technical problems of Jilantai Salt Lake in Inner Mongolia such as difficulty in replenishing freshwa-ter,high sulfate content in the two-layer salt and difficulty in post-treatment of ammonia-alkali wastewater,the process of preparing liquid salt by mixing two-layer salt saturated brine with ammonia alkali waste liquid and the process of preparing liquid salt by dissolving two-layer salt after mixing ammonia alkali waste liquid with distilled water were studied,respectively.From the online Raman experiment,it was measured that the reaction took more than 1 h to reach equilibrium.The ef-fect of mechanical stirring rate,chemical reaction time,mixing ratio of ammonia alkali waste liquid and distilled water on the contents of NaCl,SO42- and Ca2+ in liquid salt were investigated.The results showed that the reaction process of CaCl2 and Na2SO4 was the rate controlling step of CaSO4·2H2O reaction crystallization process under the conditions of the molar ratio of SO42- and Ca2+ was 1∶1,25 ℃,300 r/min.Under the same conditions,it took more than 120 minutes to produce the liquid salt of guaranteed reagent during the technology route of preparing liquid salt by mixing two-layer salt saturated brine with ammonia alkali waste liquid.In the the process of preparing liquid salt by dissolving two-layer salt after mixing ammonia alkali waste liquid with distilled water,under the conditions of volume ratio of ammonia-alkali waste liquid to freshwater was1∶(5.55~6.36),25 ℃,300 r/min,the optimal liquid salt was obtained by separation after reaction for 120 min.

Cite this article

Runpu Wang , Wei Du , Kaibao Hu , Zhanhe Wang , Weixing Gao , Na Tang . Study on the process of preparing liquid salt of guaranteed reagent by dissolving two-layer salt in ammonia-alkali wastewater[J]. Inorganic Chemicals Industry, 2021 , 53(8) : 83 -86 . DOI: 10.19964/j.issn.1006-4990.2020-0518

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