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The initial temperature is 860-880 oC and the final is at 900-920 o C. Cupels must be capable of resist high temperatures, absorb oxides, but no liquid metals. Typically, cupels are fabricated with magnesia, calcium sulphate, lime and clay, and a mixture between calcium sulphate and lime-clay.

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The production of blown metal having sufficiently high temperature and carbon content to convert in the BOF. 5< The melting of a high ratio of steel scrap to liquid iron for increasing the output of liquid

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Slag - Wikipedia

Slag from steel mills in ferrous smelting, on the other hand, is designed to minimize iron loss and so mainly contains oxides of calcium, silicon, magnesium, and aluminium. Any sandy component or quartz component of the original ore automatically carries through the smelting process as silicon dioxide.

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