粗镍经过下列过程可以转化为纯度99.9%的高纯镍，发生的反应

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粗镍经过下列过程可以转化为纯度99.9%的高纯镍，发生的反应是

下列说法正确的是

A．50～80℃时，适当增大压强，有利于Ni(CO)₄的生成

B．180～200℃时，气态的Ni(CO)₄会分解出纯Ni

C．提纯过程中，CO(g)的量不断减少

D．温度越高，Ni(CO)₄(g)的转化率越低

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