producing purified salt from raw rock salt

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Before undergoing electrolysis, the raw rock salt solution must go through the following steps :

  • brine must be clarified and de-aerated;
  • Mg2+ must be precipitated using lime and Ca2+ using sodium carbonate; this is carried out in Circulator, Turbocirculator, Densadeg type reactors;
  • sulphates are partly removed using lime or calcium chloride, and the crystallization water stock solutions recycled in Densadeg type reactors.