What did Calamine Brass Smelting look like?

Golden-yellow metal objects. The transition from copper-red to yellow depends on zinc content (~15-30%). Tang Dynasty brass was mainly used for Buddhist statues and coinage.

How did Calamine Brass Smelting work?

Crushed copper + calamine + charcoal → charged into furnace and heated to ~1000°C → calamine decomposes → ZnO → charcoal reduces ZnO → zinc vapor infiltrates copper → Cu-Zn alloy forms → brass.

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黄铜冶炼

Calamine Brass Smelting

Co-smelting calamine (smithsonite/ZnCO₃) with copper via solid-state reduction to produce Cu-Zn alloy, lowering the melting point and improving casting properties.

黄铜冶炼

Scientific Principle

Solid-state diffusion alloying: zinc vapor diffuses into solid copper. Sherardizing principle.

黄铜冶炼

Calamine Brass Smelting

Scientific Principle

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