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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Influence of methanol content in formaldehyde used as raw material for preparing low-formaldehyde (low molecular ratio) UF resin was studied.

研究了原料甲醛中甲醇含量对低醛化(低摩尔比)脲醛树脂性能的影响。

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