Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ivb metal
Patent
1984-11-20
1987-05-05
Carter, H. T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ivb metal
75 1T, C01G 23047
Patent
active
046631313
ABSTRACT:
In the preparation of titanium dioxide comprising autothermically digestion a titanium-containing raw material with sulphuric acid to form a solid relatively easily soluble digestion cake containing titanyl sulphate, extracting metal sulphates from this cake by water or dilute sulphuric acid, separating the undissolved residues and, optionally after crystallization of iron sulphate heptahydrate, hydrolyzing the titanyl sulphate to produce titanium oxide hydrate, and calcining the titanium oxide hydrate to titanium dioxide, the improvement which comprises adding to the raw material a metal sulphate and effecting the autothermic decomposition with sulphuric acid of about 80 to 88% concentration. Advantageously the acid is obtained by mixing dilute acid with concentrated sulphuric acid or oleum, some of the dilute acid and metal sulphate coming from a by-product filter cake produced in the course of the process.
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patent: 2774650 (1956-12-01), Oppegaard
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patent: 4038363 (1977-07-01), Jarish
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Gerken Rudolf
Gutsche Walter
Lailach Gunter
Muller Wolfgang D.
Wiederhoft Gerhard
Bayer Aktiengesellschaft
Carter H. T.
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