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OJSC “NOVOLIPETSK STEEL”

OJSC “NOVOLIPETSK STEEL”. ENVIRONMENTAL ASPECT OF INDUSTRIAL TECHNOLOGIES FOR RECYCLING OF FE- AND ZN-CONTAINING SLUDGE AND DUST . Speaker: Ivan Kurunov – Doctor of Technical Sciences. 2011.

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OJSC “NOVOLIPETSK STEEL”

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  1. OJSC “NOVOLIPETSK STEEL” ENVIRONMENTAL ASPECT OF INDUSTRIAL TECHNOLOGIES FOR RECYCLING OF FE- AND ZN-CONTAINING SLUDGE AND DUST Speaker: Ivan Kurunov – Doctor of TechnicalSciences 2011

  2. The production of one ton of steelrequiresspendingalmost 20 GJ of energy and isaccopmpanied by the emission of 1.7 t of СО2 into the atmosphere. Inaddition 20-25 kg of sludges and dustaregenerated, containing upto 60% of ironin the form of oxides and upto 2.5% of zink. In blast furnace iron production 5-15 kg of sludges isgenerated, where, apart from iron and carbon (25-30%), upto 1.5% of zinkiscontained. The recycling of thistechnologicallygeneratedrawmaterialwillbeasolutiontooneof the mostimportantenvironmental and economicaltasks.

  3. Wereviewedfourindustrial process routesfor recycling of iron and zink containing sludges and dustswith the obtaining of ironasafinalproductandcommodity output withhighcontent of zink. For all the routes СО2 through out emission wascalculatedat the recycling of BOF and BF iron and zink containing sludges forironproducer of an integrated type in the amount of 600 thousandt/y. The firststageforallthese technologies isusuallya pelletizingof the sludges by the method of hardextrusionwhichmakesabletoobtainsturdycylindrical briquettes 20-30 mmindiameter and 40-80 mminlength.

  4. Melting briquettes ina blast furnace (DK Recycling process)

  5. Metallization of briquettes inaringchamber furnace withrotatingfloor (Fastmet, Rediron) and the use of the received DRI in blast furnace process

  6. Metallization of briquettes by Waeltz process and the use of the resulting DRI in blast furnace process

  7. Melting of briquettes inOxyCupcupola

  8. The methodfor calculation of through out consumption of fuel and emission of СО2 Consumption of fuel and oxygen in blast furnace process fordifferentvariantswasevaluated by computer simulation modelwith the application of abalancemathematicalmodelofa blast furnace process, constructedwith the usetheoperationallineof A. Rist. The fuel consumption inOxyCup process wasassumed according to the published data. • Atthecalculation of throughoutconsumptionoffuelandemissionof СО2thefollowingfuelconsumptionfiguresweretakenintoaccount: • coke production, • sinter production, • pellets calcination, • production of DRI out of sludges, • oxygen production, • iron production ina blast furnace, • ironmakinginacupola.

  9. Consumption of carbon and emission of СО2 inironmakingaccording to the variants, kg/t

  10. CONCLUSION Of all industrially used technologies for recycling of iron and zink containing sludges and dusts the minimum fuel consumption per ton of iron, made using them, and the minimum СО2 emission is provided by: the blast furnace process recycling of briquettes from these sludges and blast furnace processing of DRI whichwasproduced by metallization of such briquettes by FastmetorRedironprocesses. Through out emission of СО2in OXYCUP process and in BF process with the use of DRI, produced by Waeltz process, 1.3 and 1.8 timeshigher, thanduring the melting of the briquettes in the blast furnace.

  11. Thank you for your attention!

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