酸性溶液中SO_2选择性还原分解钨过氧配合物——钨中微量钼的除去  

Selective Reduction Decomposition of Peroxotungstate by SO_2 in Acidic Solution——Removing Trace Molybdenum from Tungsten

作　　者：王志宏[1] 蒋安仁[1] 顾春林 

机构地区：[1]复旦大学化学系,上海200433

出　　处：《高等学校化学学报》1992年第6期732-734,共3页Chemical Journal of Chinese Universities

摘　　要：用SO_2还原4:2钨过氧配合物[H_4W_4O_(12)(O_2)_2]已被作为在室温和低酸度条件下生产钨酸的一种新方法——络合均相沉淀法.有意义的是,这一方法还能用SO_2对钨、钼过氧配合物的选择性分解,同时除去钨中的微量钼.本文研究了不同游离酸度和不同反应温度条件下选择性分解时的除钼效果,并初步给予理论上的解释.Complex-Homogeneous Precipitation Method was developed for precipitation of tungstic acid at room temperature and low acidity. This method can also be used to remove trace molybdenum from tungsten by selective reduction decomposition when SO2 is introduced to the mixed solution. The linear relationship between peroxotungstate and peroxomolybdate concentration in solution was established, i e.which A = ln[W]0 - kln[Mo]0. The separation constant k becomes large when temperature and acidic strength rise and their relationship is k rises slightly with the increase of [H+ ]2(from [H+] = 0. 5 to 4.0 mol/L) and exp ( - 1/T) (T = 273 +t , 20≤t≤50℃). The kinetics mechanism was also discussed.

关 键 词：钨过氧配合物 钨钼分离 二氧化硫 

分 类 号：O614.613[理学—无机化学]