Na_2CO_3高温分解黑钨矿的热力学分析  

Thermodynamic Analysis of Wolframite Decomposition by Na_2CO_3 at high Temperature

作　　者：李忠岐[1] 陈冬英[1] 许亮[1] 洪侃[1] 

机构地区：[1]赣州有色冶金研究所,江西赣州341000

出　　处：《中国钨业》2017年第1期65-68,共4页China Tungsten Industry

摘　　要：本文对Na_2CO_3高温分解黑钨矿进行了热力学分析并进行了实验验证。首先通过反应式得出吉布斯自由能图,分析可知Na_2CO_3与MnWO_4(FeWO_4)在有氧参与条件下比无氧参与条件下更有利于反应的发生。然后通过热力学计算得出各反应平衡图,分别分析了在无氧条件下和在有氧条件下Na_2CO_3与MnWO_4(FeWO_4)的反应,得出增加Na_2CO_3的物质的量在有氧以及无氧条件下均有利于MnWO_4(FeWO_4)完全分解时反应温度的降低。最后进行了实验验证,通过Na_2CO_3与黑钨矿在有氧以及无氧条件下的对比试验,通过比较得出当温度升高时,黑钨矿分解率上升,在有氧化剂条件下,其分解率更高。This paper studies the thermodynamic analysis of wolframite decomposition by Na2 CO3 at high temperatures. The analysis of the Gibbs Free Energy Map showed that MnWO4 and FeWO4 were more liable to be reacted with Na2 CO3 under oxygen conditions than in oxygen-free conditions. The equilibrium diagram analysis of adding Na2 CO3 to MnWO4 （ FeWO4） shows that the increasing dosages of Na2 CO 3 under oxygen and oxygen-free conditions are conductive to the reduced temperature during the complete reaction of MnWO4 （ FeWO4）.The comparison experiments of adding Na2 CO3 to wolframite under oxygen and oxygen-free conditions show that the wolframite decomposition rate increases with the rising temperature.

关 键 词：NA2CO3 高温分解 黑钨矿 热力学 

分 类 号：TF841.1[冶金工程—有色金属冶金]