Methods of extraction of products from titanium-bearing materials
AssigneeAvertana Limited
InventorsCampbell Stuart MCNICOLL, Mohammed Shereez ALI, Jason Trevor HERROLD, David Jonathan HASSELL
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Abstract
The invention relates to processes for the extraction of products from titanium-bearing materials or a composition produced in a process for the production of titanium dioxide, and more particularly, although not exclusively, extracting titanium dioxide and/or one or more other products from iron making slag.
Claims29
A method for the recovery of one or more product from a titanium-bearing material comprising perovskite, the method comprising:
- a) contacting the titanium-bearing material with sulfuric acid to form a cake comprising at least titanyl sulfate
- b) contacting the cake with water and/or dilute sulfuric acid to form a sulfated suspension comprising at least titanyl sulfate
- c) separating solids from liquid in the sulfated suspension to produce a first permeate (LL) comprising at least titanyl sulfate and a first retentate comprising at least calcium sulfate and silica;
- and,
- d) hydrolysing titanyl sulphate in the first permeate to produce a first liquor comprising titanium dioxide hydrate
- e) separating titanium dioxide hydrate from the first liquor to produce titanium dioxide hydrate and a second liquor (PHL) comprising at least aluminium sulfate
- f) separating aluminium sulfate from the second liquor (PHL) to produce aluminium sulfate and a third liquor (PAL) comprising mixed metal sulfates;
- or,
- d) separating aluminium sulfate from the first permeate (LL) to produce aluminium sulfate and a first liquor comprising at least titanyl sulfate
- e) hydrolysing titanyl sulphate in the first liquor to produce a second liquor (PHL) comprising titanium dioxide hydrate
- f) separating titanium dioxide hydrate from the second liquor (PHL) to produce titanium dioxide hydrate and a third liquor (PAL) comprising mixed metal sulfates.
(canceled)
(canceled)
(canceled)
A method for the recovery of one or more product from a composition derived from a sulfate process for the production of titanium dioxide, the method comprising at least the steps of:
- a) combining calcium carbonate and the composition to produce a composition (A) which comprises calcium sulphate;
- and,
- b) separating calcium sulfate from the second composition (A) to produce calcium sulfate and a composition (B) comprising mixed metal sulfates comprising magnesium sulfate.
-31. (canceled)
Dependencies are inferred from the claim text.