Crushing and grinding

     Hematite ores are harder than magnetite ores, and therefore require more energy to crush and grind if beneficiation is required. Hematite ores in large lumps should be sized into required dimension through primary crushing and secondary crushing. Grinding process would also be conducted if necessary in the following steps.

Gravity separation

     Many factors would influence the performance of shaking tables, such as slopes, stroke, frequency, amounts of washing water, characteristics etc. in order to upgrade the concentrate, one stage of cleaner is used and the cleaner middlings are re-ground and mixed with rougher middlings for magnetic separation.

High intensity magnetic separation

     Since the iron contents in the rougher middlings and cleaner middlings are high, and the particles size of the cleaner middlings is relatively large, you would use high intensity magnetic separator to process the mixture of cleaner middlings after regrinding and rougher middlings.

Flotation

      Open-circuit flotation process is adopted and corn starch is used as depressants, CaO as activators, LKY as collector. Concentrates and tailings obtained after one cleaner and three scavengers are greatly upgraded.