but the heating is continued in a closed furnace

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Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace
12
Nov
Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace but the heating is continued in a closed furnace Galena (an ore) is partially oxidized by passing air through it at high temperature. [...]
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