British Steel Plc.

Other

Hugh Willmott Grenfell

David James Bowen

Robert Baker

Exercise and toning apparatus

A method is provided for refining molten metal containing an impurity which is oxidizable in preference to one or more selected constituent elements of the metal and which forms a gaseous oxide, the method comprising injecting oxygen and a diluent gas into the molten metal contained in a vessel so as to reduce the proportion of the impurity in the metal by evolution as the gaseous oxide, weighing the vessel during refining to establish a point at which the weight of the vessel contents changes significantly due to preferential oxidation of the one or more selected constituent elements, initiating at the point a reduction in the ratio of oxygen: diluent gas to as to reduce the rate of oxidation of the one or more selected constituent elements relative to the impurity and continuing injection until the proportion of the impurity is reduced to the desired level.

Refining molten metal

A method of predicting the temperature of a molten steelmaking charge during a steelmaking refining process involving oxygen injection comprises selecting a time t a charge datum temperature from which to begin monitoring the charge temperature, determining the rates dc/dt and dOs/dt over a time increment dt, where dc/dt is the rate of decarburization and dOs/dt is the rate at which oxygen enters the steelmaking slag, inserting the values of dc/dt and dOs/dt in the equation:

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Swansea, United Kingdom

Hugh Willmott Grenfell