摘要
以钒渣亚熔盐法钒铬共提工艺所得到的中间产品钒酸钙为研究对象,针对钒酸钙后续产品转化问题,提出钒酸钙碳化铵化生产钒氧化物的工艺路线;研究NH_4HCO_3转化溶出钒的工艺条件,考察是否通入CO_2、NH_4HCO_3的添加量、反应温度、不同液固比以及反应时间等对钒酸钙转化溶出效果的影响。结果表明:钒酸钙碳化铵化反应的最佳条件为反应温度75℃,液固比20:1,通入CO_2,且流速1.5 L/min,铵钒摩尔比1.0,反应时间1h,此条件下钒酸钙中钒转化率为97.35%。
A new process which transforms calcium vanadate, the intermediate product during the previous vanadium-chromium co-extraction by vanadium slag sub-molten salt roasting process, to vanadium oxide using carbonization-ammonium method was proposed. The subsequent transformation of calcium vanadate and the vanadium extraction using NH_4HCO_3 as reactant was studied. The effects of CO_2, NH_4~＋-V mole ratio, liquid-solid ratio and reaction time were investigated. By controlling the reaction temperature at 75 ℃, liquid-solid ratio of 20, CO_2 flow rate of 1.5 L/min, NH_4~＋-V mole ratio of 1 and reaction time of 1 h, the optimal process conditions are obtained, which make the vanadium conversion from calcium vanadate reach 97.35%.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2016年第9期2023-2031,共9页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展计划资助项目(2013CB632605)
国家自然科学基金资助项目(51404227,51274179)
中国科学院材料服务网络计划资助项目(KDJ-SW-STS-148)~~
关键词
钒渣
亚熔盐
钒酸钙
碳化铵化
碳酸氢铵
vanadium slug
sub-molten salt
calcium vanadate
carbonization-ammonium process
ammonium bicarbonate
