purification process of iron ores
Patent US290215 - Process of purifying iron ore preparatory to .UNITED STATES CUMMINGS CHERRY, sEi,. PATENT O FICE,. OF CHICAGO, ILLINOIS. SPECIFICATION forming part of Letters Patent No. 290,215, dated.purification process of iron ores,How iron is made - material, manufacture, making, history, used .Iron ore is converted into various types of iron through several processes. .. A byproduct of iron purification is slag, which is produced in huge amounts.