"There is a great demand at present for this country to develop its manganese resources. The hazards encountered because of the present international crisis make it almost impossible to import high-grade ores. Manganese is one of the most important strategic metals because it is vital to the production of steel. After the stock piles are depleted and the imports decreased, the deficit must be supplied by the domestic deposits. A great deal of research has been done to concentrate the domestic low-grade ores but new problems have always been encountered. The differences in the properties of the low-grade ores from various sections of the country require the application of a large number of different treatments. Because phosphorus is such an undesirable element in the production of iron and steel it is, therefore, necessary to eliminate it from the manganese concentrate used in this industry. Some of the larger domestic manganese deposits have a high phosphorus content. The concentrates produced from these deposits by the current methods often contained enough phosphorus to make them unsuitable for use in iron and steel production. It was believed the phosphorus could be eliminated if the ore were sulfated with sulfur dioxide in the gaseous state at elevated temperatures and the soluble manganous sulfate extracted with water. The presence of iron in the manganese concentrate is undesirable only because it presents a problem of corrosion in the evaporation of the leaching solution to recover the manganese. By sulfating the ore at temperatures above that at which ferrous and ferric sulfates decompose to give the water-insoluble oxides, no iron should be extracted in the leaching of the sulfated ore with water"--Introduction, page 1-2.
Schrenk, Walter T.
Chemical and Biochemical Engineering
M.S. in Chemical Engineering
Missouri School of Mines and Metallurgy
iv, 54 pages
© 1942 Emil Pietz, All rights reserved.
Thesis - Open Access
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Pietz, Emil, "Recovery of manganese from oxidized ores as iron-and phosphorus-free soluble salts" (1942). Masters Theses. 4963.