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Quicklime Burned in a Rude Stone Kiln, Ure 1839
Limestone burned hot gives off carbonic acid and leaves quicklime. Andrew Ure (1839) describes the oldest kiln: a ring of rough stone walls filled with layers of fuel and broken limestone over brushwood, the top heaped into a cone and covered with sods so it burns slowly and evenly. Quicklime heats hard with water and burns the skin: keep it dry and wear gloves and glasses.
The picture: quicklime powder on a watch glass.
中级
A week
说明
1
1
Build the ring
Build the ring
Build a ring of rough stones about 2 m across and 1 m high (ours) on bare ground, leaving a gap at the foot for air.
所需工具：
毛石
铁锹
皮革工作手套2
2
Load it
Load it
Break the limestone into fist-sized pieces. Lay brushwood on the floor, then alternate layers of firewood and charcoal with layers of limestone, heaping the top into a cone.
此步骤所需材料：
碳酸钙——破碎石灰石100 公斤所需工具：
大锤
干树叶与引火柴
薪柴
木炭
等臂天平皮革工作手套
安全眼镜3
3
Burn slowly
Burn slowly
Light the brushwood at the foot from a bow-drill ember. When the kiln is burning well, cover the cone with sods (cut turf), leaving the air gap open, so it burns slowly and evenly for several days.
所需工具：
弓钻铁锹皮革工作手套4
4
Draw the lime
Draw the lime
When it has burned out and gone cold, open it up and rake out the burnt stones, which are now lighter and white. Weigh them and store dry in a lidded metal bucket.
所需工具：
铁耙等臂天平
带盖金属提桶皮革工作手套安全眼镜
防尘口罩5
5
Lime from your stone
Lime from your stone
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材料
1- 100 公斤占位符
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