湿法磷酸汽提法脱氟技术研究

Abstract

Abstract: In the process of production of feedgrade DCP/MDCP，only m（P2O5）/m（F）≥250 in wet process phosphoric acid can meet the production requirements.The steam stripping technology was applied in defluorination of wet-process phosphoric acid.The influences of stripping method，stripping time，stripping temperature，concentration of phosphoric acid， and vacuum degree on the efficiency of removing fluoride were studied.Experiments showed that through decompression defluorination，put phosphoric acid with mass fraction of 50% into round bottom flask，added silica 2 time of F content，rose acid temperature to 100 ℃，controlled vacuum degree at 20 kPa for 1 h，m（P2O5）/m（F） could reach 286.97，and meeting the phosphoric acid requirements of feed grade calcium hydrogen phosphate（DCP）.

Key words: wet process phosphoric acid, defluorination, steam stripping

CLC Number:

TQ126.35

HE Bin-Bin, ZHOU Qiong-Bo, ZHANG Hui, FU Ying, FANG Shi-Xiang. Study on defluorination for purifying wet-process phosphoric acid by steam stripping[J]. INORGANICCHEMICALSINDUSTRY, 2016, 48(9): 49-.

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Inorganic Acid-Base-Salt Committee of CIESC

Study on defluorination for purifying wet-process phosphoric acid by steam stripping

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