METHOD TO PRODUCE CRUSHED ROCK FROM IRON-CONTAINING MATERIAL Russian patent published in 1995 - IPC

FIELD: construction materials production. SUBSTANCE: method has four stages of crushing, control size screening after 2-d and 3-d stages of crushing with separation of iron-containing product on 2-d stage of control size screening and dry magnetic separation with production of magnetic and non-magnetic products. Non-magnetic product of dry magnetic separation is subjected to additional size screening. Magnetic product of dry magnetic separation together with over-screen product of additional size screening is fed for fourth stage crushing. After fourth stage crushing product is fed back to 2-d stage of control size screening. EFFECT: effectively separates iron materials from other crushed rock. 1 dwg