EP 2531628 A1 20121212 - PROCESS FOR THE RECOVERY OF TITANIUM DIOXIDE AND VALUE METALS BY REDUCING THE CONCENTRATION OF HYDROCHLORIC ACID IN LEACH SOLUTION AND SYSTEM FOR SAME
Title (en)
PROCESS FOR THE RECOVERY OF TITANIUM DIOXIDE AND VALUE METALS BY REDUCING THE CONCENTRATION OF HYDROCHLORIC ACID IN LEACH SOLUTION AND SYSTEM FOR SAME
Title (de)
VERFAHREN ZUR RÜCKGEWINNUNG VON TITANDIOXID UND WERTVOLLEN METALLEN DURCH REDUZIERUNG DER KONZENTRATION VON HYDROCHLORSÄURE IN EINER LAUGUNGSLÖSUNG UND SYSTEM DAFÜR
Title (fr)
PROCÉDÉ ET SYSTÈME DE RÉCUPÉRATION DE DIOXYDE DE TITANE ET DE MÉTAUX DE VALEUR PAR RÉDUCTION DE LA CONCENTRATION D'ACIDE CHLORHYDRIQUE DANS UNE SOLUTION DE LIXIVIATION
Publication
Application
Priority
- US 42050010 P 20101207
- US 30571810 P 20100218
- US 30145810 P 20100204
- CA 2011000142 W 20110204
Abstract (en)
[origin: WO2011094858A1] The present invention describes a process and system for recovering titanium dioxide and other value metals from a titanium bearing solid. The process comprises (a) leaching the solid in hydrochloric acid to produce a leachate comprising undissolved solids and a leach solution comprising the titanium dioxide and the value metals, wherein the hydrochloric acid concentration is maintained above a value required to maintain the titanium dioxide and the value metals dissolved in the leach solution at atmospheric pressure; (b) separating the leachate into the leach solution and the undissolved solids; and (c) reducing the concentration of hydrochloric acid concentration in the leach solution to recover titanium dioxide by hydrolysis and precipitation to produce a titanium dioxide rich slurry. In a preferred embodiment, HCl is recovered with a matrix solution.
IPC 8 full level
C22B 34/12 (2006.01); C22B 3/10 (2006.01); C22B 3/26 (2006.01)
CPC (source: EP US)
C22B 3/22 (2013.01 - EP US); C22B 3/44 (2013.01 - EP US); C22B 34/1245 (2013.01 - EP US); C22B 34/1259 (2013.01 - EP US); C22B 34/22 (2013.01 - US); Y02P 10/20 (2015.11 - EP US)
Citation (search report)
See references of WO 2011094858A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2011094858 A1 20110811; AU 2011213512 A1 20120816; AU 2016204038 A1 20160714; AU 2016204038 B2 20180524; CA 2788384 A1 20110811; CA 2788384 C 20190219; EP 2531628 A1 20121212; US 2013195738 A1 20130801; ZA 201206582 B 20140326
DOCDB simple family (application)
CA 2011000142 W 20110204; AU 2011213512 A 20110204; AU 2016204038 A 20160616; CA 2788384 A 20110204; EP 11739307 A 20110204; US 201213567013 A 20120804; ZA 201206582 A 20120903