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Updated: May 25, 2025
It has projections that cause the powdered ore to be lifted above the flame, and, at a certain height, to fall through the flame and so be rapidly raised to the temperature required to effect the oxidation of the oxidisable minerals which it is desired to extract.
The alloy of manganese and other materials now used in the atmospheric process contains 50 percent of manganese a proportion which could never be obtained from the blast furnace, owing to the highly oxidisable nature of that metal.
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