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Preparation Method Of Tellurium

wallpapers News 2020-12-08
Telluride is a compound of tellurium and metal or non-metal. For example, the representative of telluride with non-metal is hydrogen telluride, which is a colorless, odorous toxic gas; metal telluride has copper telluride, which is difficult Dissolved in water.
 
Preparation
 
Industrially, tellurium is extracted from the anode slime of copper smelting. The anode slime containing about 3% tellurium is dried and then sulphated roasted at 250°C, and then selenium dioxide is volatilized at 700°C, leaving tellurium in the roasting slag. The copper sulfate is leached with water, and then leached with sodium hydroxide solution to obtain a sodium tellurite solution. The leaching solution is neutralized with sulfuric acid to generate crude tellurium oxide precipitate. Repeated precipitation of oxides twice, and then electrolysis of aqueous solution, tellurium containing 98% to 99% tellurium can be obtained. It can also be recovered from the fumes of zinc smelting.

 
Physical properties
 
Tellurium has two allotropes, namely black powder, amorphous tellurium and silver-white, metallic luster, hexagonal crystalline tellurium semiconductors, with a forbidden bandwidth of 0.34 eV.
 
Among the two allotropes of tellurium, one is crystalline tellurium with metallic luster, silvery white, brittle, and similar to antimony; the other is amorphous powder with dark gray. Medium density, low melting and boiling points. It is a non-metal element, but it has very good heat transfer and electrical conductivity. Among all non-metal companions, its metallicity is the strongest.

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