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1. WO2020221968 - PROCESS FOR TREATING BAUXITE PHYSICAL ENRICHMENT RESIDUES

Publication Number WO/2020/221968
Publication Date 05.11.2020
International Application No. PCT/FR2020/000146
International Filing Date 22.04.2020
IPC
C01F 7/06 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
06by treating aluminous minerals with alkali hydroxide
CPC
C01F 7/0613
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
06by treating aluminous minerals ; or waste-like raw materials; with alkali hydroxide ; , e.g. leaching of bauxite according to the Bayer process
0613Pretreatment of the minerals, e.g. grinding
C01F 7/062
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
06by treating aluminous minerals ; or waste-like raw materials; with alkali hydroxide ; , e.g. leaching of bauxite according to the Bayer process
062Digestion
C01F 7/0693
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
06by treating aluminous minerals ; or waste-like raw materials; with alkali hydroxide ; , e.g. leaching of bauxite according to the Bayer process
0693from waste-like raw materials, e.g. fly ash, Bayer calcination dust
Applicants
  • IB2 [FR]/[FR]
Inventors
  • OCCELLO, Yves
Agents
  • IXAS CONSEIL
Priority Data
190449829.04.2019FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) PROCESS FOR TREATING BAUXITE PHYSICAL ENRICHMENT RESIDUES
(FR) PROCEDE DE TRAITEMENT DE RESIDUS D'ENRICHISSEMENT PHYSIQUE DE BAUXITE
Abstract
(EN)
Process for manufacturing alumina trihydrate or alumina from a bauxite physical enrichment residue, said physical enrichment residue having been pretreated by a process comprising calcining (2020) and leaching (2030), in order to obtain a residue referred to as pretreated, said process comprising the steps of: digesting (2120) said pretreated residue with an aqueous solution of soda at a temperature of at least 100°C, said aqueous solution of soda having a concentration of between 100 g Na2O/L and 220 g Na2O/L; separating (2130) the solid residue from the liquid phase; crystallizing the aluminium trihydrate (2160) by addition of seeds (2170); separating (2180) the crystallized aluminium trihydrate from the liquid phase, optionally, calcining (2194) said aluminium trihydrate in order to obtain alumina (2196).
(FR)
Procédé de fabrication de trihydrate d'alumine ou d'alumine à partir d'un résidu d'enrichissement physique de bauxite, ledit résidu d'enrichissement physique ayant été prétraité par un procédé comprenant une calcination (2020) et une lixiviation (2030), pour obtenir un résidu dit prétraité, ledit procédé comprenant les étapes de : digestion (2120) dudit résidu prétraité avec une solution aqueuse de soude à une température d'au moins 100 °C, ladite solution aqueuse de soude présentant une concentration comprise entre 100 g Na20/L et 220 g Na20 / L; séparation (2130) du résidu solide de la phase liquide; cristallisation du trihydrate d'aluminium (2160) par ajout de germes (2170); séparation (2180) du trihydrate d'aluminium cristallisé de la phase liquide, optionnellement, la calcination (2194) dudit trihydrate d'aluminium pour obtenir l'alumine (2196).
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