THE CONCEPT OF TRANSITION TO LOW-SLAG CONVERTER TECHNOLOGY

E. M. Sigarev, A. G. Chernyatevich, D. O. Gurzhiy, E. A. Chubina

Abstract


The concept introduction low-slag is substantiated converter technology using resource and an energy efficient route «blast furnace – converter with combined purge» in raw material conditions Ukrainian metallurgical industry. Provided technological advantages preliminary refining hot metal in the filler bucket by injection deep into the melt powder mixtures of reagents in the flow gas-carrying through the nozzles submersible rotary lance. For results high-temperature experiments defined rational refinement regimes, type and ratio in mixtures low-cost cheap reagents.

The concept is proposed energy efficient training slag cast iron to low slag converter melting through implementation desulfurization, desiliconization and dephosphorization of hot metal in the ladle injection deep into the melt powder mixtures reagents in the stream carrier gas through the nozzles submersible rotary lance.At smelting in Ukraine in accordance with the raw material base pig iron, containing 0,86-1,43% Si, 0,08-0,68% Mn, 0,022-0,065% S, 0,035-0,065% P, at the first stage technological route using elements low-slag technology converter melting it seems actual development energy efficient integrated technology refining hot metal in the ladle with the removal of silicon, sulfur and phosphorus with the use of cheap non-reagents.The use of integrated technology will allow depending on the specific conditions work of metallurgical enterprises and metal assortment to provide: improvement quality and cheapening production of pig iron in blast furnaces, including in transition conditions to injecting coal-pulverized fuel; melting in converters with combined purge for low-slag technology cheaper high quality steel; rational charges of magnesian modifiers for preparation and use the final converter slag for application on lining in order to create a protective.The authors of the work the principle opportunity is shown the use cheap non-deficit fluxes on the basis of lime (CaO) or soda (Na2CO3) as flux for complex refining of hot metal with high oxidation potential and high sulfide and phosphate capacity.Done experimental test a one-step removal method silicon to 0,15-0,20% and phosphorus to ≤0,008-0,010% by purging previously desulphurized hot metal through the submersible rotary lance oxygen jets bearers powder mixtures low-cost cheap reagents.

Keywords


converter; rotary lance; hot metal; refining; blowing

References


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DOI: https://doi.org/10.31319/2519-2884.32.2018.159

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Copyright (c) 2018 E. M. Sigarev, A. G. Chernyatevich, D. O. Gurzhiy, E. A. Chubina

ISSN (print) 2519-2884

ISSN (online) 2617-8389