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Purification of Crude Phosphoric Acid by Solvent Extraction  

Yoon, Yu-Mi (Daeil Development Co., Ltd. R&D center)
Shin, Chang-Hoon (Daeil Development Co., Ltd. R&D center)
Kim, Ju-Yup (Daeil Development Co., Ltd. R&D center)
Kim, Hyun-Sang (Daeil Development Co., Ltd. R&D center)
Ahn, Jae-Woo (Dept. of Advanced Material Sci. & Eng. Daejin University)
Publication Information
Resources Recycling / v.14, no.5, 2005 , pp. 40-44 More about this Journal
Abstract
The purified phosphoric acid was recovered from crude phosphoric acid with high contents of aluminium and molybdenum ions to reuse the acid as an etchant. In this work, solvent extraction was applied to recover the phosphoric acid from crude phosphoric acid. Phosphate was used as an extractant. Further cleaning and removing processes on the recovered phosphoric acid were conducted to eliminate the metallic ion impurities in the acid. The process parameters were successfully optimized, so that the finally purified acid contained less than 1 ppm of aluminium and molybdenum ion.
Keywords
crude phosphoric acid; extraction; stripping; scrubbing; molybdenum; aluminium;
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