<報文>満俺鑛處理に關する基礎研究(第6報) : 二酸化満俺の硫酸化焙焼

概要

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Sulfatizing roasting process which is based upon the preferential salfatizing of manganese dioxide was studied. Manganese dioxide mixed with artificial powdered ferrous sulfide was roasted under abundant supply of air in a sulfating manner for various amount of time, viz., from six to one hundred minutes, while analysing the outgoing gases containing sulfur dioxide and trioxide, and then the solid products were leached out. Comparing the results thus obtained with those from complementary experiments required to make the mechanism of the present reaction clear, the following conclusions were obtained. It was found that the present roasting process makes practically no iron go into solution if the reaction continue over sixty minutes, and that the sulfatizing of manganese dioxide proceed through two steps including the stage where there should be only slight reaction. Each of two steps should be explained by different mechanism. The initial step seems to make practically pretreatment of ores available, while in the principal one, following the slowness to react observed after the initial step, preferential sulfatizing of manganese dioxide is efficient. The most suitable roasting temperature of this process, so far as manganese and iron are concerned, was found to be 600℃, and also under such a condition, it was found that the concentration of sulfur dioxide needed may be only about 4 pct.
東北大学の論文
1954-03-25