DEVELOPMENT OF AUTOMATIC SYSTEM OF GAS-DYNAMIC CUT-OFF OF SLAG FOR CONVERTER WITH ROTATING VESSEL SHELL

The steelmaking unit for the processing of poor-quality charge and metal-containing wastes with a high content of harmful impurities must satisfy to some requirements which are considered at the article. Also the expediency of using the oxygen converter with rotating vessel shell as a prototype is justified. To increase the efficiency of such converter, it is proposed to supply it with a system of gas-dynamic slag cut-off at automatic mode during the steel tapping into the casting ladle. The proposed system is structurally a twin lever mechanism ensuring (during the metal overflow into the ladle through the edge of converter's mouth) holding at the constant distance from it the gas distribution chamber with slotted nozzles, from which flat gas jets run under excess pressure, directed at a given angle of attack to the surface of slag melt covering the teemed steel. Due to the dynamic impact of these jets on the layer of liquid slag, it is pushed away from the edge of the mouth of the inclined vessel shell towards its bottom, i.е. it is retained in the bath of melting unit. Synchronous movement of the structural elements of the lever mechanism with the end part of converter’s mouth is achieved by force interaction of the stops rigidly fixed on the supporting ring of the melting unit with swivel arms kinetically connected with the gas distribution chamber. At the same time, activation of the gas-dynamic system of slag cut-off and its shutdown occur automatically by a mechanical connection. After the finishing of steel tapping the slag is poured into the bowl, turning the vessel shell in the opposite direction from the steel casting ladle. The results of experimental verification of the operation of the proposed converter slag gas-dynamic cut-off system performed on its model confirmed correctness of the accepted technical solutions. The practical application of this development will significantly reduce the material losses associated with the ingress of a large amount of aggressive converter slag into the casting ladle (deoxidizing and ligature burning, intensive wear of the refractory lining and the possibility of metal rephosphorization).

poor-quality charge, oxygen converter, aggressive slag, steel output, gas-dynamic slag cut-of

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