2010•Yunnan Daxue xuebao. Shehui kexue banRequires access

Defluorination of wet-process phosphoric acid with chemical precipitation-solvent precipitation

Xueping Chen

Abstract

The purification of wet-process phosphoric acid was researched with chemical precipitation-solvent precipitation with ethanol as solvent and RNH2 as precipitator. The optimized process parameters were obtained:the volume ratio of ethanol to pretreatment acid 2∶ 1,solvent precipitator 3. 5% (w),reaction temperature 40 ℃,reaction time 100 min. Under the condition,the ratio of defluorination was up to 96% and the yield of phosphorus was up to 86%.

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Key concepts: Phosphoric acid, Precipitation, Solvent, Chemistry, Yield (engineering), Ethanol, Process (computing), Surface-area-to-volume ratio