METHOD OF PROCESSING INDUSTRIAL WASTES Russian patent published in 1997 - IPC

FIELD: waste disposal. SUBSTANCE: method includes fraction selection, gravitational enrichment, and magnetic separation. Processed are products caught from flue gases on settling equipment. Magnetic separation is conducted as multistage process: the 1st stage consists of low- magnetic separation, the 2nd is high-gradient one, and the 3rd stage is separation in traveling field. Low-magnetic separation is carried out in 0.08-0.12 Tesla field with isolation into magnetic fraction of largest part of ferric oxide containing 45-60% ferrous oxide, whereas non-magnetic fraction is directed into the second stage to isolate via high-gradient magnetic separation remaining part of iron- containing components being in joins with rare-earth and other valuable metals. Non-magnetic fraction issued from high-gradient magnetic separation containing 25-40% of silicon and aluminium oxides and less than 3% iron oxide is withdrawn as raw material for manufacturing building materials. Magnetic fractions from the 1st and 2nd stages are combined prior to be loaded into 3rd stage to be separated there into strong and feeble magnetic fractions. The former containing more than 64% iron oxide is used as metallurgical raw material, and the latter is further subjected to hydrometallurgical isolation of rare-earth and other valuable metals. EFFECT: enhanced efficiency of process.