Abb Research Ltd.

Abb Schweiz Ag

Ola Widlund

Jan-Erik Eriksson

Xiaojing Zhang

Mohamed Ali Rahmani

Olof Hjortstam

Hongliang Yang

Tord Kroon

Rebei Bel Fdhila

Mats Molander

Shiva Sander-Tavallaey

Johan Sjöberg

Ulf Sand

Kalevi Tervo

Christer Carlsson

Rickard Lindkvist

Jan- Erik Eriksson

A method for reducing vortex formation in molten metal when bottom tapping the molten metal from a metallurgical vessel in a metal making process. The method includes the steps of tapping the molten metal via a tapping hole in the metallurgical vessel, and providing a flow of the molten metal in the metallurgical vessel while tapping via a time-varying electromagnetic field applied to the metallurgical vessel, the flow of the molten metal being such that it constantly moves vortices in the molten metal away from a tapping hole region during the tapping to thereby prevent accumulation of the vortices for vortex formation over the tapping hole. It is also presented an arrangement for carrying out the method.

Method and arrangement for vortex reduction in a metal making process

A method for melting steel in an electric arc furnace (EAF). A hot heel is provided in the EAF. Metal scrap is loaded into the EAF. The metal scrap is melted in the EAF. The mass of the hot heel in relation to the mass of the metal scrap that is initially beyond the surface of the hot heel is a certain minimum. This minimum is 0.75 times the relation between the heat required to melt the metal scrap beyond the surface of the hot heel and the heat that can be taken from the hot heel without it being solidified when a theoretical heat balance calculation is applied as defined in a formula.

Method for melting steel

An apparatus for electromagnetic stirring of the steel melt in an electrical arc furnace includes two electromagnetic stirrer units, a current supply, and a control unit. The two stirrers are mounted on an outer bottom surface of the electrical arc furnace at opposites sides of a central position of the bottom surface, the current supply is operatively connected to the two electromagnetic stirrer units, and the control unit is operatively connected to the current supply to control the operation of the two electromagnetic stirrer units.

Apparatus and method for electromagnetic stirring in an electrical arc furnace

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Hagersten, Sweden

Ola Widlund