Zinc, sometimes called spelter, is one of our most useful metals, and is widely distributed, although it never occurs alone. Sulphide of zinc and carbonate...
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https://www.riss.kr/link?id=O123834435
1890년
eng
학술저널
PHP / Magazines / Feature
123 [※수록면이 p5 이하이면, Review, Columns, Editor's Note, Abstract 등일 경우가 있습니다.]
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Zinc, sometimes called spelter, is one of our most useful metals, and is widely distributed, although it never occurs alone. Sulphide of zinc and carbonate...
Zinc, sometimes called spelter, is one of our most useful metals, and is widely distributed, although it never occurs alone. Sulphide of zinc and carbonate of zinc are its chief sources, and from these compounds it has to be distilled. The first step in the extraction of zinc is to reduce the ore to an oxide. Carbonate of zinc heated gives oxide of zinc and carbonic acid gas (Zn CO3 = Zn 0 + CO2)...
A RIDGE AND HIP COVERING FOR ROOFS.