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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.
中级
1 day
说明
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.
此步骤所需材料：
辉碲铋矿1 as required所需工具：
碳酸钠（纯碱）
亚麻籽油
石制研钵与研杵2
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.
所需工具：
带盖坩埚（瓷质）
马弗炉
坩埚钳3
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.
所需工具：
水
玻璃烧杯
滤纸4
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.
所需工具：
大气空气 - 地球
抽气器滤纸此蓝图制作
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