北京科技大学学报2013，Vol.35Issue(3)：352-357,6.
仲钨酸铵还原制备超粗球形钨粉
Preparation of coarse and spherical tungsten powders by ammonium paratungstate
辛延君 1郭志猛 1罗骥 1王瑞欣 1方哲成1
作者信息
摘要
Abstract
Coarse and spherical tungsten powders were prepared by wet hydrogen reduction. Ammonium tungstate solutions with the additives of Li, Na and K alkali metal salts were used as raw materials. The effects of the type and content of the alkali metal salts as well as reduction time on the microstructure, chemical composition, phase composition, and particle size of ammonium paratungstate (APT) and coarse tungsten powders were investigated by scanning electronic microscopy, energy dispersive spectroscopy, X-ray diffraction, and test sieves. It is shown that ideal tungsten powders with good fluidity, sphericity, integrity and even distribution can be obtained by using the ammonium tungstate solution with 3 g·L-1 NaCl, KC1 and Li2CO3 and reducing at 1000 ℃ for 180 min in wet hydrogen atmosphere. The average particle size of the obtained tungsten powders is 67 μm, the maximum particle size is 150 μm, the biggest loose density is 13.41 g·cm-3, and the best powder flowability is 9 s for 50 g tungsten powders.关键词
碱金属盐/钨酸铵/钨冶金/还原Key words
alkali metal salts/ ammonium tungstate/ tungsten metallurgy/ reduction分类
矿业与冶金引用本文复制引用
辛延君,郭志猛,罗骥,王瑞欣,方哲成..仲钨酸铵还原制备超粗球形钨粉[J].北京科技大学学报,2013,35(3):352-357,6.
