Pyrolusite is an important raw material of preparing manganese sulfate, and about 60% manganese sulfate was produced by pyrolusite.

软锰矿是生产硫酸锰的重要原料，世界上约60%的硫酸锰由软锰矿加工制得。

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The process conditions and mechanism of preparing expand graphite by using cheap fine flake graphite as raw material was primarily studied in this paper.

本文主要研究了利用成本低廉的细鳞片石墨制备膨胀石墨的工艺条件及机理。

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Technical conditions for preparing bismuth subnitrate with bismuth oxychloride concentrate as the raw material have been studied.

研究了以氯氧化铋精矿为原料，制取次硝酸铋的工艺条件。

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