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二氧化锰主要存在于软锰矿中。Ｃｈａｐｍａｎ对地球上锰矿的储量进行了详细地论述和研究。另外 ,在《ＩｎｔｕｓｔｒｉａｌＭｉｎｅａｌｓ》书中对锰矿石及其市场也进行了评述。美国没有什么高品位的锰矿。尽管这样 ,美国人Ｈａｙ仍对低品位的锰矿石处理过程进行过研究。合成
Manganese dioxide is mainly found in pyrolusite. Chapman discusses and studies the reserves of manganese ore on Earth in detail. In addition, manganese ore and its market are also reviewed in the book Intustrial Minerals. The United States does not have any high grade manganese ore. Despite this, the American Hay still studied low-grade manganese ore processing. synthesis