C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
53/155, 23/261
C01G 23/053 (2006.01) C22B 34/12 (2006.01)
Patent
CA 1234990
ABSTRACT OF THE DISCLOSURE: A process is described in which a TiO2 concentrate is recovered from TiO2-containing starting materials, where- in said starting materials are leached with dilute mineral acid at an elevated temperature and the separated residue is treated with reducing agents and is subsequently leached with dilute mineral acid at an elevated temperature. In order to produce a high-grade TiO2 concentrate with the aid of dilute waste sulfuric acid, which constitutes a waste pro- duct and is discarded in the process, a) the starting material is leached in the first leaching stage with dilute waste sul- furic acid at a temperature of 160 to 180°C and under super- atmospheric pressure to produce an intermediate concentrate having a TiO2 content of about 60% or more, b) the intermediate concentrate is filtered off and is reduced by a treatment with a carbon-containing fuel after an optional oxidation, c) the dilute waste sulfuric acid obtained as a filtrate from the first leaching stage is used to leach the reduced product of step b) at temperatures between 60 and 180°C and, if desired, under superatmospheric pressure so as to consume all free sulfuric acid and to obtain a concentrate having a TiO2 content of 80% or more, and d) iron sulfate heptahydrate is crystallized in the filtrate.
481721
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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