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Autoclave and Ambient Pressure Leaching of Lake Superior Manganiferous Ores.
NTIS: PB 199 044 :18 pages
Leaching of manganese from low-grade Minnesota ores was studied over the temperature range 25 deg to 225 deg c at atmospheric and elevated pressures to demonstrate that good recoveries of manganese could be achieved from unroasted ores using reagents available nearby. Various combinations of ore, pyrite, lignite derivatives, and sulfuric acid were tested on a small scale. Pyrite alone required the highest temperature to effect a good extraction, but the combination of pyrite, lignite char, and sulfuric acid solubilized 99 percent of the manganese after 30 minutes of reaction at 75 deg c.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 199 044
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division