Processing of Chemical Waste in Coke Production at OAO EVRAZ NTMK

Calculation shows that the quantity of chemical waste generated by coke production at OAO EVRAZ NTMK is more than 1000 t per month. Recent changes in coke production that may affect waste generation are considered: the introduction of batch crushing; relining of coke batteries 5 and 6; shutdown of coke batteries 7 and 8; hot repairs at coke batteries 9 and 10; shutdown of the open-hearth shop, where some of the chemical waste had been incinerated; discontinuation of the removal of light pyridine bases from the coke-oven gas in the byproduct-capture shop; the discontinuation of the production of heavy pyridine bases in the tar-distillation shop and their processing in the rectification shop; and the closing of the department of coumarone-indene resins. Recalculated with respect to the batch, the total rate of chemical-waste generation in coke production at OAO EVRAZ NTMK is 0.443%. A complex waste-processing system has been developed: 30% of the total is sent to the coal store and processed with the coal batch in coke ovens; 27% is processed to produce emulsion, which is added to the batch; and 43% is processed with tar, pitch, and raw benzene. Such waste processing at OAO EVRAZ NTMK increases its monthly output by 250 t for coke; 300 t for tar; 880000 m(3) for coke-oven gas; and 180 t for commercial products.