副产物硫化铜经氧化焙烧生成氧化铜，循环使用于下一次合成中。
The byproduct copper sulfide was transformed into copper oxide by roasting, which was cyclically used in the next syn - thesis.
同时， 不同的火焰循环时间和空气渗漏对焙烧的能耗影响较大， 降低火焰循环时间将导致能耗增加， 而降低空气渗漏量则可极大地降低能耗。
It is also found that the fuel consumption increases with the decrease of firing cycle time, and cutting down the air infiltration will be helpful for saving fuel.
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