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Zhang Wei, [ 1] to soft manganese and sulfur iron ore raw material, the sulfuric acid flooding after the addition of a pure sulfuric acid solution, and the manganese carbonate and ammonium in ammonia and a manganese, manganese for thermal decomposition will be purity >90% of the manganese oxide 2

(1) and so on Zhang Qiwei take the pyrolusite and the pyrite as the raw material, takes after the sulfur acid pickling after mixed makes the pure manganese sulfate solution, again passes through the ammonium bicarbonate and the ammonia water neutral system results in the manganese carbonate, carries

Zhang Qiwei, [1] with sulfur soft manganese ore and iron ore as raw materials, after sulfuric acid leaching of impurity is pure manganese sulfate solution, Ammonium bicarbonate and ammonia and manganese carbonate, purity manganese carbonate thermal decomposition of >90% manganese dioxide.

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