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用不同来源的二氧化锰(如软锰矿和锰结核)在酸性溶液中与煤反应,可使四价锰还原并溶于溶液。反应速度与温度关系密切,最快的反应速度是在溶液接近沸点时达到的。反应速度还取决子酸的浓度和煤的数量,与硫酸相比,使用盐酸时反应速度要快些,而且没有观察到氯化物离子氧化成氯。结果90％以上的锰被提出取来,其它有色金属,如锰结核中的镍,也以同样程度被提取出来。
With different sources of manganese dioxide (such as pyrolusite and manganese nodules) react with coal in acidic solution, manganese can be reduced and dissolved in solution. The reaction rate is closely related to the temperature and the fastest reaction rate is reached when the solution is near the boiling point. The rate of reaction is also dependent on the concentration of the acid and on the amount of coal. The reaction is faster with hydrochloric acid than with sulfuric acid and no chloride ions are oxidized to chlorine. As a result, more than 90% of the manganese was extracted and other non-ferrous metals, such as nickel in manganese nodules, were also extracted to the same extent.