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Quicklime Burned in a Rude Stone Kiln, Ure 1839
Leiem (Wikimedia Commons) · CC BY-SA 4.0
Mary

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Mary

14. uMfumfu 2026FI
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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.
Ophakathi
A week

Imiyalelo

1

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.

Amathuluzi adingekayo:

Itshe ElingakabazwaItshe Elingakabazwa
IfosholoIfosholo
Amagilavu Omsebenzi EsikhumbaAmagilavu Omsebenzi Esikhumba
2

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.

Izinto zokwakha zalesi sinyathelo:

I-Calcium Carbonate - Itshe Lekalika ElichotshoziweI-Calcium Carbonate - Itshe Lekalika Elichotshoziwe100 kg

Amathuluzi adingekayo:

Isando esikhuluIsando esikhulu
Amaqabunga omile nezinkunzanaAmaqabunga omile nezinkunzana
IzinkuniIzinkuni
AmalahleAmalahle
Isikali sesilinganisoIsikali sesilinganiso
Amagilavu Omsebenzi EsikhumbaAmagilavu Omsebenzi Esikhumba
Izibuko zokuphephaIzibuko zokuphepha
3

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.

Amathuluzi adingekayo:

Ibhoboza LomnsaloIbhoboza Lomnsalo
IfosholoIfosholo
Amagilavu Omsebenzi EsikhumbaAmagilavu Omsebenzi Esikhumba
4

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.

Amathuluzi adingekayo:

Ihala lensimbiIhala lensimbi
Isikali sesilinganisoIsikali sesilinganiso
Ibhakede lensimbi elinesivaloIbhakede lensimbi elinesivalo
Amagilavu Omsebenzi EsikhumbaAmagilavu Omsebenzi Esikhumba
Izibuko zokuphephaIzibuko zokuphepha
Imaski YothuliImaski Yothuli
5

Lime from your stone

Ilayisha incwadi ye-Jupyter…

Izinto

1

Amathuluzi Adingekayo

13

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Hardwood Ash from a Clean Fire Lit by Bow Drill

Hardwood Ash from a Clean Fire Lit by Bow Drill

ngu-WoodyNO

Umsebenzi Wokhuni

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Making Charcoal from Hardwood — Pyrolysis in a Pit Kiln

Making Charcoal from Hardwood — Pyrolysis in a Pit Kiln

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Amakhemikhali

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