THE PROCESS FOR REMOVAL OF IRON FROM FERRUGINOUS MANGANESE ORES

摘要

1. A process for the removal of iron from ferruginous manganese ores by roasting the ore between 600 to 1000 C for about 50 to 70 minutes followed by acid leaching, characterised in that the acid used is a very dilute {1-5%) aqueous solution of nitric acid whereby most of the iron remains unaffected by manganese goes into solution, which is subjected to conventional treatment by hydrolysis with ammonia and chlormation to obtain manganese dioxide product.