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Potash and Pearl-Ash From Wood Ash: Leaching Tun, Evaporation, Calcining and Recrystallising (Tomlinson, 1854)
How 19th-century potash was made, from Tomlinson's Cyclopaedia of Useful Arts (1854): wood ash leached in a tun with a straw-covered false bottom, the lye boiled to dryness and calcined to crude potash or white pearl-ash, then purified by dissolving in its weight of cold water, letting the less soluble salts settle, and crystallising the carbonate of potash.
Miðlungs
About 1 week
Leiðbeiningar
1
1
Crude potash content
Crude potash content
Hleð Jupyter-vinnubók…
2
2
Read the Cyclopaedia of Useful Arts
Read the Cyclopaedia of Useful Arts
"Plants which grow near the sea mostly contain soda; inland plants potash. The ashes of the latter are lixiviated with water in a large cask or tun."
3
3
Build the leaching tun
Build the leaching tun
Fit a large cask with a false perforated bottom covered with straw, a plugged hole (o) between it and the real bottom, and a pipe (p) from the top down through the false bottom to let the air escape (Fig. 1667).
Efni fyrir þetta skref:
Hálmur1 stykkiNauðsynleg verkfæri:
Tréfata
Handsveifarbor með bor
Handsög4
4
Leach
Leach
Fill with ashes of inland plants (wood ash), add water, and after some hours draw off the liquid; add more water until all the soluble matter is out. Pour the weakest solutions onto fresh ash instead of water.
Efni fyrir þetta skref:
Viðaraska1 stykkiNauðsynleg verkfæri:
Tréfata
20 lítra fata5
5
Evaporate and calcine
Evaporate and calcine
Boil the leys to dryness and heat the residue to redness to burn off the brown organic matter: this is crude potash, or pearl-ash when white and pearly.
Nauðsynleg verkfæri:
Stór pottur
Smiðjueldstæði
Deigla6
6
Purify
Purify
Treat the crude potash with its own weight of cold water and leave it several days, stirring now and then; the less soluble sulphate and chloride stay behind. Syphon off the liquor, boil it fast until small crystals appear, take it off the fire and stir as it cools so only small crystals form. Drain them on a filtering bed, wash with a little pure carbonate of potash, and dry at a stove.
Nauðsynleg verkfæri:
Skálavog20 lítra fataStór pottur
Bómullardúkur7
7
Troubleshooting
Troubleshooting
Potash troubleshooting.
Flow
Loading...
8
8
History and honest limits
History and honest limits
From Charles Tomlinson (ed.), **Cyclopaedia of Useful Arts** (London, 1854), vol. II, "Potassium" (checked on the archive.org scan cyclopdiaofuse02tomlrich, pp. 434-435). He gives no quantities for the leaching; the tools are ours.
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