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35 percent iron analytical specifications ball mill batch test Bureau of Mines calcite carbonate cleaner concen concentrates assaying concentrates were passed conditioner Cuyuna range Davis magnetic tube Davis tube Davis-tube separations ferous iron ferruginous manganese concentrates frother gravity methods grinding circuit Harz hematite Inst investigation iron minerals ksfo laboratory flotation concentrates larger jig magnetic log-washer magnetic separation manganese and iron Mangani material Maximum Maximum Maximum meeting the analytical mesh Float Metallurgical Division middlings and slimes Mn Fe Insol obtained oleic acid operation ore-dressing percent acid insoluble Percent of total percent Percent percent phosphorus percent silica pilot-plant flotation pounds procedure Product Weight pulp recovered in concentrates recovery of manganese Reducing agents roast and separate roasted flotation concentrates roasting and magnetic screen separation of manganese siliceous gangue soda ash Sodium oxalate sodium silicate specific gravity specifications for ferromanganese-grade spiegeleisen spigot product Table concentrates table middlings total manganese total Mn zinc