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Tellurium: Bismuth Telluride Calcined with Soda and Oil, Air Blown through the Leach (Thorpe 1913)
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1. Ugushyingo 2026DE
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Tellurium: Bismuth Telluride Calcined with Soda and Oil, Air Blown through the Leach (Thorpe 1913)

Roasting bismuth telluride with soda and oil in a closed pot turns the tellurium into sodium telluride, which dissolves in water. Air drawn through the solution throws the tellurium out again as a grey powder. Result: grey tellurium powder. Source: Thorpe, Dictionary of Applied Chemistry vol. 5 (1913), p. 433. Not given: amounts, temperature and which oil. Picture drawn by Youblob.
Hagati
1 day

Amabwiriza

1

Powder the ore and make a paste

Grind tetradymite (bismuth telluride) finely, mix it with sodium carbonate and rub it up with oil into a thick paste. Ours: linseed oil.

Ibikoresho by'iyi ntambwe:

TetradimiteTetradimite1 as required

Ibikoresho bikenewe:

Karubonate ya Sodiyumu (ivu rya soda)Karubonate ya Sodiyumu (ivu rya soda)
Amavuta y'UbudodoAmavuta y'Ubudodo
Isekuru n'Umuhini by'IbuyeIsekuru n'Umuhini by'Ibuye
2

Calcine in a closed crucible

Calcine the paste in a closed crucible. Ours: a porcelain crucible with lid in a muffle furnace.

Ibikoresho bikenewe:

Ikirundo cyo gushongeramo gifite igifuniko (porukorene)Ikirundo cyo gushongeramo gifite igifuniko (porukorene)
Ifuru ya muffleIfuru ya muffle
Amakoro y'Icyombo GishongeshaAmakoro y'Icyombo Gishongesha
3

Leach with cold water

Leach the calcined mass with cold water; the sodium telluride dissolves. Ours: filter off what does not dissolve.

Ibikoresho bikenewe:

AmaziAmazi
Igikombe cy'IkirahureIgikombe cy'Ikirahure
Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura
4

Draw air through

Draw a current of air through the solution. Tellurium separates as a grey powder. Ours: an aspirator, then filter it off.

Ibikoresho bikenewe:

Umwuka wo mu kirere - IsiUmwuka wo mu kirere - Isi
AsipirateriAsipirateri
Urupapuro rwo KuyungururaUrupapuro rwo Kuyungurura

Ibikoresho

1
  • 1
    Tetradimite
    1 as required
    Umwanya

Ibikoresho bikenewe

11

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