BRPI0415197A - process to reduce obstruction of the heat exchangers of a bayer circuit - Google Patents

process to reduce obstruction of the heat exchangers of a bayer circuit

Info

Publication number
BRPI0415197A
BRPI0415197A BRPI0415197-6A BRPI0415197A BRPI0415197A BR PI0415197 A BRPI0415197 A BR PI0415197A BR PI0415197 A BRPI0415197 A BR PI0415197A BR PI0415197 A BRPI0415197 A BR PI0415197A
Authority
BR
Brazil
Prior art keywords
liquor
bauxite
sodium aluminate
aluminate liquor
bayer
Prior art date
Application number
BRPI0415197-6A
Other languages
Portuguese (pt)
Inventor
Benoit Cristol
Valerie Esquerre
Original Assignee
Pechiney Aluminium
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 Pechiney Aluminium filed Critical Pechiney Aluminium
Publication of BRPI0415197A publication Critical patent/BRPI0415197A/en

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
    • C01F7/0606—Making-up the alkali hydroxide solution from recycled spent liquor

Landscapes

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

Abstract

"PROCESSO PARA REDUZIR A OBSTRUçãO DOS TROCADORES TéRMICOS DE UM CIRCUITO BAYER". A presente invenção refere-se a um processo Bayer de produção de trihidrato de alumínio, comportando: a) uma etapa de moagem (B) da bauxita (10); b) uma etapa de ataque (A) dessa bauxita por um licor de aluminato de sódio; c) uma etapa de separação líquido-sólido (C e F); d) uma etapa de decomposição (D) do licor de aluminato supersaturado; e) após separação de trihidrato de alumina precitado (30), uma etapa de concentração (E) por evaporação do licor de aluminato de sódio para reciclá-lo como licor de ataque, esse processo sendo caracterizado pelo fato de se introduzir nesse licor de aluminato de sódio um composto à base de cálcio (11, 111, 11<39>, 111<39>) pertencente ao grupo dos aluminatos tricálcicos, a introdução desse composto à base de cálcio sendo feita nesse licor de aluminato de sódio entre sua parte da cadeia de decomposição e sua mistura com a bauxita moída, a montante de um trocador de calor."Process for Reducing Obstruction of BAYER CIRCUIT THERMAL EXCHANGERS". The present invention relates to a Bayer process of producing aluminum trihydrate comprising: a) a milling step (B) of bauxite (10); b) an attack step (A) of this bauxite by a sodium aluminate liquor; c) a liquid-solid separation step (C and F); d) a decomposition step (D) of the supersaturated aluminate liquor; e) after separation of the precarious alumina trihydrate (30), a concentration step (E) by evaporating the sodium aluminate liquor to recycle it as an attack liquor, this process being characterized by the fact that it is introduced into this aluminate liquor. a calcium-based compound (11, 111, 11 <39>, 111 <39>) belonging to the tricalcium aluminates group, the introduction of this calcium-based compound being made to this sodium aluminate liqueur between its part of the decomposition chain and its mixture with ground bauxite upstream of a heat exchanger.

BRPI0415197-6A 2003-10-10 2004-10-08 process to reduce obstruction of the heat exchangers of a bayer circuit BRPI0415197A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0311909A FR2860782B1 (en) 2003-10-10 2003-10-10 METHOD FOR REDUCING THE HEAT EXCHANGER ENCRASSMENT OF A BAYER CIRCUIT
PCT/FR2004/002538 WO2005035445A2 (en) 2003-10-10 2004-10-08 Method for reducing fouling of heat exchangers in a bayer circuit

Publications (1)

Publication Number Publication Date
BRPI0415197A true BRPI0415197A (en) 2006-12-05

Family

ID=34355407

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0415197-6A BRPI0415197A (en) 2003-10-10 2004-10-08 process to reduce obstruction of the heat exchangers of a bayer circuit

Country Status (6)

Country Link
CN (1) CN1960945A (en)
AU (1) AU2004280272B2 (en)
BR (1) BRPI0415197A (en)
FR (1) FR2860782B1 (en)
OA (1) OA13269A (en)
WO (1) WO2005035445A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2934852B1 (en) 2008-08-06 2011-06-24 Alcan Int Ltd IMPROVEMENT TO THE BAYER PROCESS FOR PRODUCTION OF ALUMINA TRIHYDRATE, SAID PROCESS COMPRISING A STEP IN WHICH THE SURSATURATED LIQUEUR IS FILTERED AT HIGH TEMPERATURE BEFORE DECOMPOSITION

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1474885A (en) * 1966-02-07 1967-03-31 Electro Chimie Soc D Process for descaling devices used for the concentration of sodium aluminate solutions
US5118484A (en) * 1990-08-17 1992-06-02 Alcan International Limited Desilication of bayer process solutions
FR2686872B1 (en) * 1992-02-05 1994-06-03 Pechiney Aluminium PROCESS FOR REMOVAL OF SODIUM OXALATE FROM BAYER CYCLE SODIUM ALUMINATE SOLUTIONS.
AUPM761194A0 (en) * 1994-08-23 1994-09-15 Comalco Aluminium Limited Improved process for the extraction of alumina from bauxite
JPH0975498A (en) * 1995-09-07 1997-03-25 Nishizawa:Kk Ski

Also Published As

Publication number Publication date
WO2005035445A3 (en) 2006-06-22
CN1960945A (en) 2007-05-09
AU2004280272B2 (en) 2009-08-06
WO2005035445A2 (en) 2005-04-21
AU2004280272A1 (en) 2005-04-21
FR2860782B1 (en) 2006-09-29
OA13269A (en) 2007-01-31
FR2860782A1 (en) 2005-04-15

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Legal Events

Date Code Title Description
B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 8A E 9A ANUIDADES

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 2229 DE 24/09/2013.