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US 2017/0190592 A1Published application
Extraction of products from titanium-bearing minerals
AssigneeAvertana Limited
InventorsDavid Jonathan Hassell, James Kevin Obern, Sean Daniel James Molloy, Sherif Owen Zaki Emad Marshall Ibrahim, Mohammed Shereez Ali
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Abstract
The invention relates to a process for extracting metals and salts from titanium-bearing minerals such as perovskite. More particularly, although not exclusively, the invention relates to extracting titanium dioxide and optionally other compounds from melter slag derived from an iron-making process.
Claims18
A method of recovering titanium dioxide and aluminium sulphate from a particulate material, said method comprising:
- a. contacting the particulate material with sulphuric acid and heating to form a sulphated mixture;
- b. filtering the sulphated mixture to produce a filter cake and a first permeate comprising sulphuric acid;
- c. contacting the filter cake with water to form a sulphated suspension comprising titanyl sulphate;
- d. filtering the sulphated suspension to produce a permeate comprising at least titanyl sulphate, and a retentate comprising insoluble residue;
- e. contacting the permeate comprising at least titanyl sulphate with water to produce a hydrolysis liquor;
- f. hydrolysing the titanyl sulphate;
- g. separating titanium dioxide hydrate from the hydrolysis liquor to produce a permeate comprising aluminium sulphate, and a retentate comprising titanium dioxide hydrate;
- and
- h. precipitating aluminium sulphate from the permeate;
- wherein step h. may be carried out after step d or after step g.
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(canceled)
A system for the recovery of products from a particulate material, the system comprising:
- a. a reactor adapted to receive and heat sulphuric acid and particulate material comprising at least titanium dioxide and produce a sulphated mixture;
- b. a first filtration unit adapted to receive the sulphated mixture and produce a first permeate comprising at least sulphuric acid, and a filter cake comprising at least titanyl sulphate;
- c. a reactor adapted to receive a solution comprising titanyl sulphate and heat said solution to produce a hydrolysis liquor;
- d. a separation unit adapted to receive the hydrolysis liquor and separate titanium dioxide hydrate;
- e. at least one precipitation tank to facilitate precipitation of aluminium sulphate;
- and
- f. at least one further filtration unit to facilitate separation of precipitated aluminium sulphate.
4 more elements
Dependencies are inferred from the claim text.