金属钨(W)可做白炽灯泡的灯丝。用黑钨矿[主要含有FeWO
4(钨酸亚铁)]制得金属钨(W)的工艺流程如下图所示:
![](http://tikupic.21cnjy.com/71/aa/71aa50347e057d2908b022efc7558593.png)
其主要反应原理如下:
①4FeWO4+4Na2CO3+O2
4Na2WO4+2Fe2O3+4CO2
②Na2WO4+2HCl(热浓)=H2WO4+2NaCl
③H
2WO
4 ![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmunder+accentunder%3D%22true%22%3E%3Cmunder+accentunder%3D%22true%22%3E%3Cmi%3E%CE%94%3C%2Fmi%3E%3Cmo+stretchy%3D%22true%22%3E_%3C%2Fmo%3E%3C%2Fmunder%3E%3Cmo+stretchy%3D%22true%22%3E_%3C%2Fmo%3E%3C%2Fmunder%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
H
2O+WO
3 ④3H
2+WO
3 ![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmover%3E%3Cmtext%3E%3D%3C%2Fmtext%3E%3Cmrow%3E%3Cmsup%3E%3Cmrow%3E%3Cmn%3E1000%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmo%3E%E2%88%98%3C%2Fmo%3E%3C%2Fmsup%3E%3Cmi%3EC%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmover%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
W+3H
2O
下列说法错误的是( )
- A、反应③属于分解反应
- B、反应①②③④的产物都有氧化物
- C、反应①④中有元素的化合价发生改变
- D、为加快反应的速率,可将黑钨矿石碾成粉末