摘要
在NaCl Na2 WO4 WO3熔盐体系中 ,对熔盐电解法电解氧化钨制取高纯超细钨粉进行了实验研究。在该电解质体系中 ,在电解温度为 780℃、阴极电流密度为 32 0mA/cm2 的条件下 ,可以制得平均粒度为 0 96 1μm的超细钨粉。在低电流密度时 ,阴极的电解反应为W6+ 在阴极放电 ,三氧化钨直接还原得到钨粉 ;而在高电流密度时 ,阴极电解反应分为两步 ,首先是Na+ 在阴极放电 ,生成金属钠 ,然后是金属钠还原三氧化钨得到钨粉。另外 ,还对电解槽温度。
The production of tungsten powder by electrolysis in the molten salts of NaCl Na 2WO 4 WO 3 system was studied. Under the condition of electrolysis temperature 780℃ and cathodic current density 320 mA/cm 2,the tungsten powder particle of average equivalent circle diameter 0.961 μm was obtained. The measured results of opposing electromotive force of electrolysis reaction show that at lower current density, cathodic reaction is that W 6+ directly discharged to become W powder. While at higher cathodic current density, the cathodic reaction occurs in two steps:first Na + discharged to become Na, then W 6+ was reduced by Na to become W powder. The effects of temperature, cathodic current density and concentration of WO 3 in the molten salt on current efficiency were measured and studied.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2001年第5期374-377,共4页
Chinese Journal of Rare Metals
基金
国家自然科学基金资助项目 ( 5 98740 0 9)
关键词
熔盐电解
钨粉
超细粉末
制备
Molten salts, Electrolyze,Tungsten powder
