Method to upgrade titania slag and resulting product

Details Method to upgrade titania slag and resulting product Method to upgrade titania slag and resulting product

1995-11-21

1998-11-03

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423 86, 423 82, 423 74, C01G 2300, C22B 3410

Patent

active

058304207

ABSTRACT:
A method is disclosed including: (a) sizing a titania slag to a particle size range of from 75 microns to 850 microns; (b) oxidizing the sized titania slag by contacting the sized titania slag with an oxygen containing gas at a temperature of at least about 950.degree. C. for a period of at least about 20 minutes such that a substantial portion of the iron oxide is converted to a ferric state, such that the reduced titanium oxides are converted to a tetravalent state, and such that at least a major portion of the glassy silicate phase is decomposed; (c) reducing the oxidized titania slag in a reducing atmosphere at a temperature of at least about 700.degree. C. for a period of at least about 30 minutes such that the ferric state iron oxide is converted to a ferrous state; (d) leaching the reduced titania slag with mineral acid at a temperature of at least 125.degree. C. and under a pressure in excess of atmospheric pressure to yield an upgraded leached slag product and a leachate; and (e) washing and calcining the upgraded leached slag product by heating at a temperature in the range of from 600.degree. C. to 800.degree. C. The method provides advantages in that it can be used to produce a product with high TiO.sub.2 content that is suitable for the chloride process of TiO.sub.2 pigment production.

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