石油焦的煅烧可产出几乎纯的碳或人造石墨，适于生产电极、电机刷和干电池等。
Calcination of petroleum coke can yield almost pure carbon or artificial graphite suitable for production of electrodes, motor brushes, dry cells, etc.
用氨水浸取煅烧后的铜精粉时，加入一种添加剂，不仅可明显提高铜的浸取率，而且可保证产品中的杂质含量符合标准要求。
The production ratio will be increased by putting one additive in the reactor with the burned copper and ammonia. At the same time, the content of forrign matter is up to the standard.
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