络合结晶法制备高纯硼酸的研究

Abstract

Abstract: High purity boric acid product was prepared by complex crystallization using industrial boric acid as raw materials.Impurities were selectively separated from boric acid by using that way.Different kinds of analysis methods,such as complex formation titration,thermogravimetry (TGA),ICP-AES,and UV analysis were used to characterize the purity and performance of boric acid.Influences of the factors,such as kinds and dosages of oxidant and complexing agent and crystal series,on the purity of boric acid during the process of purification were investigated.Optimal conditions were obtained as follows:2% (volume fraction) H₂O₂ was added in saturated solution of boric acid,stirred and hot-filtrated,0.2% (mass fraction) aminocarboxyl chelating agent (H₂Y) was added in the filtrate at 80 ℃,and then hot-filtrated,slowly cooling to form boric acid crystal,after recrystallization and drying,the 99.99% boric acid was produced.

Key words: boric acid, purification, complexing, crystallization

CLC Number:

TQ128.54

PAN Xin-Ai, YE Jun-Wei, WANG Hao-Yu, GONG Wei-Tao, LIN Yuan, NING Gui-Ling. Preparation of high purity boric acid by complex crystallization[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(10): 18-.

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Inorganic Acid-Base-Salt Committee of CIESC

Preparation of high purity boric acid by complex crystallization

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