A NEW TECHNIQUE FOR QUICK PRODUCTION OF AMMONIUM PARATUNGSTATE (APT) CRYSTALS BY A LIQUID MEMBRANE

被引：5

作者：

WANG, XD

ZHU, B

WAN, YH

ZHANG, XJ

机构：

[1] Environmental Science Institute, South China University of Technology, Guangzhou

来源：

JOURNAL OF MEMBRANE SCIENCE | 1995年 / 105卷 / 1-2期

关键词：

EMULSION LIQUID MEMBRANE; AMMONIUM PARATUNGSTATE; CRYSTALS PRODUCTION; FINE PARTICLES PRODUCTION; UNIT-OPERATION COMBINATION;

D O I：

10.1016/0376-7388(95)00044-D

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The alkaline feed of crude sodium tungstate obtained from the caustic fusion of black tungsten ore was neutralized to a pH value near 9 to eliminate Si as routine, then the resulting feed was directly used as the external aqueous phase without eliminating P, As and Mo. Through a single stage batch liquid membrane process at room temperature for 5 min under optimum operation conditions obtained by an orthogonal test, APT directly crystallizes in the internal aqueous phase with 99.87% yield and the quality attained was the first grade of a national standard; meanwhile the pH value of the effluents was lowered to 6-7 in itself suitable for direct discharge and without W(VI) lost out of the raffinate. Finally, a continuous counter-current process of a single stage for a pilot plant was proposed.

引用

页码：55 / 62

页数：8