v1966-789

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that the resulting oxides of manganese and silicon are solid and

remain in the steel in a finely divided state in form of an emul-

sion. Further, as long as the slag contains iron oxides in solution

they will react with the molten bath, and thorough deoxidation of

the bath is impossible. The neutral slag used in the Heroult

furnace is perfectly free from iron, and this is a very important

point.

Ferrous oxide and iron carbide can exist together, and for this

reason complete deoxidation is not possible under ordinary con-

Fig. 8. Automatic regulators for Electrodes.

ditions by means of adding carbon, but this is possible wdth the

Heroult process, since the addition of carbon to the slag results

in the formation of calcium carbide, and therefore the deoxida-

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archive.org Volume Name: govuscourtsca9briefs1966

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