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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.
Katamtaman
1 day
Mga Tagubilin
1
1
Powder the ore and make a paste
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.
Mga materyales para sa hakbang na ito:
Tetradymite1 as requiredMga kailangang kasangkapan:
Karbonatong Sodyo (abo ng soda)
Langis ng Linsid
Batong Almires at Panghalo2
2
Calcine in a closed crucible
Calcine in a closed crucible
Calcine the paste in a closed crucible. Ours: a porcelain crucible with lid in a muffle furnace.
Mga kailangang kasangkapan:
Krisol na may takip (porselana)
Muffle furnace
Sipit ng Krisol3
3
Leach with cold water
Leach with cold water
Leach the calcined mass with cold water; the sodium telluride dissolves. Ours: filter off what does not dissolve.
Mga kailangang kasangkapan:
Tubig
Basong Salamin na Pang-agham
Papel na Pansala4
4
Draw air through
Draw air through
Draw a current of air through the solution. Tellurium separates as a grey powder. Ours: an aspirator, then filter it off.
Mga kailangang kasangkapan:
Hangin ng atmospera - Daigdig
AspiratorPapel na PansalaMga Materyales
1- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
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