Title:
反応性金属酸化物の抽出方法
Document Type and Number:
Japanese Patent JP2006527698
Kind Code:
A
Abstract:
The present invention relates to a zero-waste process for extraction of alumina from different types of bauxite ores and red mud residues and of titanium dioxide from ilmenite. Iron oxide is first reduced to metallic iron above the melting point of C-saturated cast iron alloy which yields a high-C iron alloy and an Al and Ti metal oxide rich slag which is then treated with alkali carbonate to form alkali aluminates and titanates. The alkali aluminates are separated by water leaching from which the hydroxide of alumina is precipitated by bubbling C02. The residue from water leaching is treated with sulphuric acid and Ti02 is precipitated via a hydrolysis route. The process recovers most of the metal values and generates only small quantities of silicious residues at pH 4-5 which can be used for soil conditioning. The present also relates to a method for selective separation of Ti02-rich oxides from titaniferrous ore/residue materials via oxidative roasting in the presence of alkali carbonate or carbonates followed by aqueous leaching of the roasted material and selective precipitation of Ti02 under controlled condition below pH=4.
Inventors:
Jar, animesh
Malpan, Pyro, Antony
Tasavadkar, Villas, Datta Tray
Malpan, Pyro, Antony
Tasavadkar, Villas, Datta Tray
Application Number:
JP2006516420A
Publication Date:
December 07, 2006
Filing Date:
June 11, 2004
Export Citation:
Assignee:
The University of Leeds
International Classes:
C01G23/04; C01F7/142; C01F7/38; C01G23/047; C01G49/06; C22B1/02; C22B7/04; C22B21/00; C22B34/12; C21C7/04; C22B5/10; C22B7/00
Domestic Patent References:
| JPH1095618A | 1998-04-14 |
Foreign References:
| FR1053383A | 1954-02-02 | |||
| WO2002010068A1 | 2002-02-07 |
Attorney, Agent or Firm:
Hiroaki Sakai