添加剂对结晶法净化磷酸的影响研究

Abstract

Abstract: Suspension crystallization was adopted to purify phosphoric acid with industrial grade phosphoric acid as raw material.Influences of sulfuric acid,hydrochloric acid,hydrofluoric acid,polyacrylic acid,tartaric acid,citric acid,EDTA-2Na，and sodium dodecylbenzensulfonate on phosphoric acid purification effect were investigated respectively.Experimental results indicated that the effects of hydrochloric acid and hydrofluoric acid on purification were better than others.Then the influences of their mass fractions on phosphoric acid purification were studied,it was found that the optimal mass fractions of hydrochloric acid and hydrofluoric acid were 0.2% and 0.8% respectively.Under those optimal conditions, phosphoric acid was re-crystallized.Results showed that there was a better purification effect with hydrofluoric acid as the additive and the concentration of Fe3⁺ and Al³⁺ were both under 1 mg/kg.

Key words: phosphoric acid, additive, crystallization, purification

CLC Number:

TQ126.35

WANG Bao-Ming, LI Jun, LUO Jian-Hong, LUO Ni. Study on effects of additives on purifying phosphoric acid by crystallization[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(2): 26-.

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Study on effects of additives on purifying phosphoric acid by crystallization

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