CA2197457A1 - Methode amelioree pour l'extraction d'alumine a partir de bauxite - Google Patents

Methode amelioree pour l'extraction d'alumine a partir de bauxite

Info

Publication number
CA2197457A1
CA2197457A1 CA002197457A CA2197457A CA2197457A1 CA 2197457 A1 CA2197457 A1 CA 2197457A1 CA 002197457 A CA002197457 A CA 002197457A CA 2197457 A CA2197457 A CA 2197457A CA 2197457 A1 CA2197457 A1 CA 2197457A1
Authority
CA
Canada
Prior art keywords
digestion
liquor
boehmite
gibbsite
fraction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002197457A
Other languages
English (en)
Inventor
Darren Paul Rodda
Raymond Walter Shaw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto Aluminium Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2197457A1 publication Critical patent/CA2197457A1/fr
Abandoned legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • C01F7/062—Digestion
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
    • C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Nutrition Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Un procédé, qui permet d'extraire l'alumine à partir d'une bauxite à relativement forte teneur en boehmite, consiste en des étapes de digestion de la fraction de gibbsite contenue dans la bauxite pendant environ 2 à 2,5 minutes, à une température d'environ 135 à 145 ~C et selon un rapport A/C d'environ 0,76, pour parvenir à une réversion de boehmite négligeable, à une dissolution pratiquement complète de la kaolinite et à une précipitation pratiquement nulle de produits de désiliciage. Ce procédé consiste ensuite à soumettre la fraction liquide provenant de l'étape de digestion de gibbsite à un post-désiliciage en présence de germes d'hydroxysodalite pour ramener la concentration en silice près de la solubilité d l'hydroxysodalite, puis à soumettre cette fraction liquide à un désiliciage secondaire à l'aide d'un aluminate de tricalcium produit à part par l'adjonction de chaux à une liqueur épuisée pour minimiser les pertes d'alumine à partir de la liqueur sursaturée et réduire la teneur en silice de la liqueur épuisée afin de limiter l'entartrage, puis à soumettre le résidu de digestion de gibbsite à une étape de digestion supplémentaire pour digérer la boehmite, cette digestion de la fraction de boehmite intervenant à une température plus basse et/ou pendant un temps de résidence plus court qu'il n'est habituel.
CA002197457A 1994-08-23 1995-08-23 Methode amelioree pour l'extraction d'alumine a partir de bauxite Abandoned CA2197457A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM7611 1994-08-23
AUPM7611A AUPM761194A0 (en) 1994-08-23 1994-08-23 Improved process for the extraction of alumina from bauxite

Publications (1)

Publication Number Publication Date
CA2197457A1 true CA2197457A1 (fr) 1996-02-29

Family

ID=3782132

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002197457A Abandoned CA2197457A1 (fr) 1994-08-23 1995-08-23 Methode amelioree pour l'extraction d'alumine a partir de bauxite

Country Status (5)

Country Link
EP (1) EP0777628A4 (fr)
AU (1) AUPM761194A0 (fr)
BR (1) BR9508761A (fr)
CA (1) CA2197457A1 (fr)
WO (1) WO1996006043A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110563011A (zh) * 2019-09-12 2019-12-13 西南能矿集团股份有限公司 一种氧化铝制备用的脱硅剂及其制备方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO376296A0 (en) * 1996-11-20 1996-12-12 Comalco Aluminium Limited Removal of silica from bauxite
US6528028B2 (en) * 1999-12-28 2003-03-04 Showa Denko K.K. Process for treating bauxite in which a desilication product and an insoluble residure are separately precipitated
FR2860782B1 (fr) * 2003-10-10 2006-09-29 Pechiney Aluminium Procede pour reduire l'encrassement des echangeurs thermiques d'un circuit bayer
US8029752B2 (en) 2009-04-06 2011-10-04 Nalco Company Approach in controlling DSP scale in bayer process
US9416020B2 (en) 2009-09-25 2016-08-16 Nalco Company Surfactant based small molecules for reducing aluminosilicate scale in the bayer process
US9487408B2 (en) 2009-09-25 2016-11-08 Nalco Company Reducing aluminosilicate scale in the bayer process
CN106542553B (zh) * 2015-09-21 2018-05-22 沈阳铝镁设计研究院有限公司 一种氧化铝生产中三水铝石矿的溶出工艺方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324769A (en) * 1979-10-01 1982-04-13 Alumina Development Corporation Extraction and production of alumina containing less than 0.03 percent iron oxide
JPS57145029A (en) * 1981-02-27 1982-09-07 Sumitomo Alum Smelt Co Ltd Extracting method of alumina from mixed type bauxite
US4446117A (en) * 1983-04-04 1984-05-01 Alumina Development Corporation Double digestion system to reduce formation of ferrous iron
US4518571A (en) * 1984-02-27 1985-05-21 Vsesojuzny Nauchno-Issledovatelsky I Proektny Institut Aljuminievo Magnievoi I Elektrodnoi Promyshlennosti Process for desilication of aluminate liquors in the production of alumina
CA1330865C (fr) * 1989-01-31 1994-07-26 George Dennison Fulford Procede de production d'alumine a partir de bauxite
GB8906500D0 (en) * 1989-03-21 1989-05-04 Shell Int Research Process for the production of aluminium hydroxide from bauxite
CA2140773A1 (fr) * 1992-07-24 1994-02-03 Anthony John Crisp Procede d'extraction de l'alumine a partir de la bauxite
AU668979B2 (en) * 1992-07-24 1996-05-23 Comalco Aluminium Limited Extracting alumina from bauxite
FR2712275B1 (fr) * 1993-11-09 1995-12-15 Pechiney Aluminium Procédé de traitement de bauxites contenant un mélange de trihydrate d'alumine et de monohydrate d'alumine.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110563011A (zh) * 2019-09-12 2019-12-13 西南能矿集团股份有限公司 一种氧化铝制备用的脱硅剂及其制备方法

Also Published As

Publication number Publication date
WO1996006043A1 (fr) 1996-02-29
AUPM761194A0 (en) 1994-09-15
BR9508761A (pt) 1998-01-13
EP0777628A4 (fr) 1999-06-09
EP0777628A1 (fr) 1997-06-11

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Legal Events

Date Code Title Description
FZDE Discontinued