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Zinc Powder: Zinc Crushed Hot, Just Below Melting
Zinc has an odd temper: brittle cold, soft enough to roll at 100 to 150 °C, and above 200 °C so tender that it crushes to powder. Thorpe (1913): zinc dust can be made by crushing the metal in a mortar at a heat somewhat below its melting point of 420 °C. Work hot with leather gloves.
The picture: our own drawing.
初学者
Half a day
说明
1
1
Cut the zinc small
Cut the zinc small
Saw 300 g of zinc into small pieces.
此步骤所需材料：
锌锭300 克所需工具：
钢锯
等臂天平2
2
Heat to just below melting
Heat to just below melting
Heat the pieces in an iron pot above 200 °C but below 420 °C, where zinc melts. Check with a pyrometer.
所需工具：
铸铁锅
木炭炉
高温计
皮手套3
3
Crush in the mortar
Crush in the mortar
Tip a few hot pieces at a time into the mortar and crush them. Hot zinc breaks to powder; reheat what is left whole.
所需工具：
研钵与研杵皮手套4
4
Sieve and store
Sieve and store
Sieve the cooled powder, return the coarse bits for another crushing, and keep the powder in a closed jar.
所需工具：
细筛
带盖玻璃罐此蓝图制作
CC0 公共领域
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