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US 4,362,557 AGranted
Purifying titanium-bearing slag by promoted sulfation
AssigneeThe United States of America as represented by the Secretary of the Interior
InventorsGerald W. Elger, Ruth A. Holmes
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Abstract
Oxide impurites are removed from the titania slag by: (1) admixing the slag with an alkali metal carbonate, sulfate or chloride, (2) reacting the admixture with SO.sub.3 or mixed SO.sub.2 --O.sub.2 gases at elevated temperature to form sulfates of the impurities and (3) leaching the sulfates from the reaction product with water.
Claims3
A process for removing alkaline earth oxide impurities from a titania slag comprising:
- admixing the slag with a promoter consisting essentially of sodium carbonate,
- reacting the admixture with sulfur trioxide gas or a mixture of sulfur dioxide and oxygen gases at a temperature of about 700.degree. to 1100.degree. C. to form a reaction product containing alkaline earth sulfates, and
- leaching the alkaline earth sulfates from the reaction product with water.
Dependencies are inferred from the claim text.