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US 5,783,166 AGranted
Process for producing antimony trioxide
AssigneeRoycefield Resources Ltd.
InventorsJ. Dean Thibault, Michael D. MacDonald, Donald A. Stevens
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Abstract
A process for the production of antimony trioxide comprising the steps of: (i) reacting antimony trisulfide with iron (III) chloride to produce antimony trichloride; and (ii) hydrolyzing antimony trichloride to produce antimony trioxide. In a preferred embodiment, the process is substantially closed or near-closed loop. Antimony trioxide is a known flame retardant for use in plastics, ceramics and the like.
Claims29
A process for the production of antimony trioxide comprising the steps of:
- (i) reacting antimony trisulfide with iron (III) chloride to produce a first aqueous solution comprising antimony trichloride, and contacting the first aqueous solution with an organic solvent resulting in extraction of antimony trichloride from the first aqueous solution;
- and
- (ii) hydrolyzing the extracted antimony trichloride to produce antimony trioxide.
Dependencies are inferred from the claim text.