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US 4,497,780 AGranted
Method and apparatus for removing arsenic from an arsenic-containing material
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsIhsan Barin, Michael Gamroth, Rolf Hesse, Soegianto Wirosoedirdio
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Abstract
Method and apparatus for the removal of arsenic compounds from an arsenic-containing material wherein the material is reacted with an oxygen carrier and a sulfur carrier under temperature conditions sufficiently high to convert the arsenic compounds to sulfides and the arsenic sulfides are thereupon condensed and deposited in solid form.
Claims4
A method for the removal of arsenic compounds from an arsenic-containing material which comprises:
- calcining said arsenic-containing material in the presence of carbon in a reducing atmosphere to drive off a gas consisting mainly of As.sub.4,
- delivering the gaseous As.sub.4 into a reaction space,
- introducing controlled amounts of a sulfur carrier with oxygen and a carbon carrier with oxygen into said reaction space,
- maintaining a temperature between 900.degree. and 1200.degree. K. in said reaction space with oxygen potentials and sulfur potentials therein leading to the reaction of As.sub.4 in a gas/gas reaction to form As.sub.4 S.sub.4,
- cooling the gaseous As.sub.4 S.sub.4 in a cooling zone by contact with a wash water to form a solid arsenic sulfide (As.sub.2 S.sub.3) concentrate which precipitates in said wash water,
- filtering out the precipitated arsenic sulfide from the wash water, and
- chemically neutralizing the separated wash water.
4 more elements
Dependencies are inferred from the claim text.