萃余酸净化制三聚磷酸钠研究

Abstract

Abstract: In order to utilize the by-product raffinate，produced in the extraction purification of wet process phosphoric acid， the preparation of sodium tripolyphosphate by purification of raffinate was explored.A fractional neutralization purification method was studied.Through control the pH in the reaction，most of harmful substances could be removed from the phosphoric acid.In order to improve the impurity removing effect during the neutralization process of wet process phosphoric acid，several precipitators，such as ammonia，ammonium chloride，ammonium oxalate，ammonium fluoride，and sodium fluoride，were added.Preliminary experiment results showed ammonia and sodium fluoride had obvious effect for the precipitation.

Key words: wet process phosphoric acid, raffinate, precipitator, purification, phosphate

CLC Number:

TQ126.35

ZHONG Xue-Lian, YOU Cai-Xia, LI Fu-Lan, ZHOU Jun-Hong, LI Kang-Yan, LIN Rong-Wen. Preparation of sodium tripolyphosphate by purification of raffinate[J]. INORGANICCHEMICALSINDUSTRY, 2013, 45(3): 28-.

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Inorganic Acid-Base-Salt Committee of CIESC

Preparation of sodium tripolyphosphate by purification of raffinate

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