Method of eliminating arsenic from arsenical manganese and iron ores

摘要

Arsenic is eliminated from manganese and iron ores, in which the arsenic is present mainly in the form of arsenates, by lixiviating the ores at a temperature not greater than 70 DEG C. with a mineral acid of not over 2N concentration. Lime may be added to the resulting solution to precipitate the arsenic as calcium arsenate.