Abstract:The use of calcium oxide as a precipitant can achieve a nonammonia enrichment of a rare earth leaching liquor. However, an alkaline rare earth sulfate forms during the precipitation process, thus resulting in excessive SO 4 2− content in the mixed rare earth oxides. Therefore, a stirring washing process for precipitation enrichment, which was obtained from calcium oxide precipitation, was investigated using a sodium hydroxide solution. It was determined that the Gibbs free energy of the stirring washing reacti… Show more
“…is slightly inferior to the barium chloride method. 10,11 In summary, the barium chloride method and calcium chloride method have their own advantages and disadvantages in removing SO 4 2À . However, the calcium chloride method is expected to replace the barium chloride method with the continuous improvement of human environmental awareness in recent years.…”
Cheap and environmentally friendly calcium chloride is used to remove SO42− in brine and Ca2+ is removed by introducing carbon dioxide. The purified brine is suitable for the electrolysis of potassium chloride.
“…is slightly inferior to the barium chloride method. 10,11 In summary, the barium chloride method and calcium chloride method have their own advantages and disadvantages in removing SO 4 2À . However, the calcium chloride method is expected to replace the barium chloride method with the continuous improvement of human environmental awareness in recent years.…”
Cheap and environmentally friendly calcium chloride is used to remove SO42− in brine and Ca2+ is removed by introducing carbon dioxide. The purified brine is suitable for the electrolysis of potassium chloride.
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