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.
Claims23
A method of recovering titanium dioxide, aluminium sulphate and magnesium sulphate from a particulate material comprising perovskite, said method comprising:
- a. contacting the particulate material comprising perovskite with sulphuric acid and heating to a maximum of 250° C. 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 second permeate comprising at least titanyl sulphate, and a retentate comprising insoluble residue comprising calcium sulphate;
- e. contacting the second permeate comprising at least titanyl sulphate with water to produce a hydrolysis liquor;
- and
- f. hydrolysing the titanyl sulphate;
- g. separating titanium dioxide hydrate from the hydrolysis liquor to produce a third permeate comprising aluminium sulphate and magnesium sulphate, and a retentate comprising titanium dioxide hydrate, to recover the titanium dioxide hydrate;
- and
- h. precipitating aluminium sulphate from the second permeate or from the third permeate, to recover the aluminium sulphate;
- i. precipitating magnesium sulphate from the third permeate, to recover the magnesium sulphate;
- wherein step h may be carried out after step d when using the second permeate or after step g when using the third permeate.
A method of recovering titanium dioxide, aluminium sulphate and magnesium sulphate from a particulate material comprising perovskite, said method comprising:
- a. contacting the particulate material comprising perovskite with sulphuric acid and heating to a maximum of 250° C. 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 second permeate comprising at least titanyl sulphate, and a retentate comprising insoluble residue comprising calcium sulphate;
- e. contacting the second permeate comprising at least titanyl sulphate with water, to produce a hydrolysis liquor;
- and
- f. hydrolysing the titanyl sulphate;
- g. separating titanium dioxide hydrate from the hydrolysis liquor, to produce a third permeate comprising aluminium sulphate and magnesium sulphate, and a retentate comprising titanium dioxide hydrate, to recover the titanium dioxide hydrade;
- and
- h. precipitating aluminium sulphate from the second permeate or from the third permeate, to recover the aluminium sulphate;
- i. precipitating magnesium sulphate from the third permeate, to recover the magnesium sulphate;
- wherein step h may be carried out after step d when using the second permeate or after step g when using the third permeate;
- and
- wherein the method further includes calcining the titanium dioxide hydrate to recover titanium dioxide.
Dependencies are inferred from the claim text.