Method of recovering metallic tellurium

Details Method of recovering metallic tellurium Method of recovering metallic tellurium

1980-07-11

1981-09-08

Thomas, Earl C.

Chemistry of inorganic compounds

Selenium or tellurium or compound thereof

Elemental selenium or tellurium

423 92, 423 95, 423140, 423146, 423558, 423559, 75 25, 75 99, 75120, C01B 1902, C01G 2120

Patent

active

042884233

ABSTRACT:
A method of recovering metallic tellurium from a residue dust containing a major amount of lead oxide, a minor amount of tellurium oxide, and a minor amount of iron oxide which comprises the steps of introducing the residue into a leach tank containing water, sulphuric acid and ferric sulphate, the sulphuric acid being present in the leach tank in an amount equal to about 5% to 10% by weight in excess of that stoichiometrically required to react with the lead and tellurium, the ferric sulphate being added as an oxidizing agent, reacting the residue with the sulphuric acid and ferric sulphate to produce lead sulphate and a tellurium solution, removing the lead sulphate and tellurium solution from the leach tank and separating the lead sulphate from the tellurium solution, adding the separated tellurium solution to a tumbler containing particles of metallic iron, agitating the tumbler so that the tellurium solution reacts with the iron to produce ferrous sulphate and metallic tellurium, withdrawing the mixture of ferrous sulphate and metallic tellurium from the tumbler and separating out the ferrous sulphate to recover essentially pure metallic tellurium.

REFERENCES:
patent: 2039256 (1936-04-01), Martin et al.
patent: 2076738 (1937-04-01), Martin et al.
patent: 3387928 (1968-06-01), Doumas
patent: 3560154 (1971-02-01), Jueschke et al.
patent: 3969495 (1976-07-01), Dreyfuss

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