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BR9813467A - Process to reduce fouling in the bayer process - Google Patents

Process to reduce fouling in the bayer process

Info

Publication number
BR9813467A
BR9813467A BR9813467-1A BR9813467A BR9813467A BR 9813467 A BR9813467 A BR 9813467A BR 9813467 A BR9813467 A BR 9813467A BR 9813467 A BR9813467 A BR 9813467A
Authority
BR
Brazil
Prior art keywords
liquor
bayer
fouling
polysaccharide
feed
Prior art date
Application number
BR9813467-1A
Other languages
Portuguese (pt)
Inventor
John David Kildea
Grant William Doberer
John Chirstopher Meldrum
Original Assignee
Nalco Chemical Co
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 Nalco Chemical Co filed Critical Nalco Chemical Co
Publication of BR9813467A publication Critical patent/BR9813467A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
    • 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
    • C01F7/0646—Separation of the insoluble residue, e.g. of red mud
    • C01F7/0653—Separation of the insoluble residue, e.g. of red mud characterised by the flocculant added to the slurry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

''PROCESSO PARA REDUçãO DE INCRUSTAçãO NO PROCESSO BAYER''. A presente invenção refere-se a um processo para redução de incrustação no processo Bayer compreendendo: (a) digestão de um minério de alumínio em um licor cáustico para extrair valores de alumina; (b) alimentação do licor em um tanque sedimentador para clarificar o licor por separação de materiais insolúveis cáusticos; e (c) precipitação de cristais de alumina do licor clarificado, compreendendo adicionalmente o processo adição de um polissacarídeo na alimentação do sedimentador em uma quantidade menor do que 50 ppm, citada quantidade sendo suficiente para minimizar a formação de incrustação e para prolongar o tempo entre operações de remoção de incrustação em comparação com uma alimentação na ausência de polissacarídeo. Por meio do uso do processo da invenção é possível substancialmente prolongar o tempo entre operações de remoção de incrustação em alguns casos em mais do que 100%.'' PROCESS FOR REDUCING INCRUSTATION IN THE BAYER PROCESS ''. The present invention relates to a process for reducing fouling in the Bayer process comprising: (a) digesting an aluminum ore in a caustic liquor to extract alumina values; (b) feeding the liquor into a sedimentation tank to clarify the liquor by separating insoluble caustic materials; and (c) precipitation of alumina crystals from the clarified liquor, further comprising the process of adding a polysaccharide to the sedimenter feed in an amount less than 50 ppm, said amount being sufficient to minimize the formation of fouling and to prolong the time between scale removal operations compared to a feed in the absence of polysaccharide. Using the process of the invention it is possible to substantially extend the time between scale removal operations in some cases by more than 100%.

BR9813467-1A 1997-12-11 1998-12-10 Process to reduce fouling in the bayer process BR9813467A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPP0849A AUPP084997A0 (en) 1997-12-11 1997-12-11 Improvements relating to the bayer process
PCT/US1998/026206 WO1999029626A1 (en) 1997-12-11 1998-12-10 Improvements relating to the bayer process

Publications (1)

Publication Number Publication Date
BR9813467A true BR9813467A (en) 2000-10-10

Family

ID=3805134

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9813467-1A BR9813467A (en) 1997-12-11 1998-12-10 Process to reduce fouling in the bayer process

Country Status (4)

Country Link
EP (1) EP1044164A4 (en)
AU (2) AUPP084997A0 (en)
BR (1) BR9813467A (en)
WO (1) WO1999029626A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009369A1 (en) * 2000-02-29 2001-08-30 Vaw Ver Aluminium Werke Ag Production of aluminum hydroxide gel, used e.g. as mordant, filler and pigment or in antihidrotic, toothpaste, paper, ceramics or abrasive, involves precipitation from diluted alkaline aluminate liquor, filtration, washing and drying
TW200303987A (en) * 2002-02-19 2003-09-16 Kyowa Medex Co Ltd Adhesion inhibiting agent for preventing metal hydroxide-containing substance from adhering to the drain line of automatic analyzer
US9284625B2 (en) 2007-11-20 2016-03-15 Nalco Company Use of polyols as scale control reagents in the mining processes
US9416490B2 (en) 2010-03-10 2016-08-16 Nalco Company Cross-linked glycerol based polymers as digestion aids for improving wood pulping processes
US9102995B2 (en) 2010-08-09 2015-08-11 Nalco Company Cross-linked ethylsulfonated dihydroxypropyl cellulose
US9199855B2 (en) 2010-08-09 2015-12-01 Nalco Company Chemical treatment to improve red mud separation and washing in the bayer process
BR112013005398B1 (en) 2010-09-06 2021-05-04 Alcoa Of Australia Limited methods to increase the stability of a liquor and to control the precipitation of aluminum-containing compounds from bayer process liquors
EP2886178A1 (en) * 2013-12-20 2015-06-24 Rio Tinto Alcan International Limited Process and installation for producing alumina trihydrate by alkaline digestion of bauxite ore
US10427950B2 (en) 2015-12-04 2019-10-01 Ecolab Usa Inc. Recovery of mining processing product using boronic acid-containing polymers
WO2022174005A1 (en) 2021-02-12 2022-08-18 Ecolab Usa Inc. Purification of bauxite ores using boronic acid-functional compounds

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127239A (en) * 1964-03-31 Method of separation
US2280998A (en) * 1940-04-13 1942-04-28 Aluminum Co Of America Alumina recovery process
US2930677A (en) * 1955-01-31 1960-03-29 Kaiser Aluminium Chem Corp Method of handling liquors containing scale forming compounds
US2935377A (en) * 1957-08-23 1960-05-03 Kaiser Aluminium Chem Corp Starch-borax settling aid and process of using
US3085853A (en) * 1958-12-23 1963-04-16 Dow Chemical Co Method of employing dextrans
US3142637A (en) * 1961-01-31 1964-07-28 Reynolds Metals Co Flocculating agent and process for digested bauxite slurries
US3397953A (en) * 1965-03-04 1968-08-20 Atlas Chem Ind Flocculating agent
US3681012A (en) * 1969-06-17 1972-08-01 Nalco Chemical Co Process for making alumina
US3966874A (en) * 1975-05-14 1976-06-29 Reynolds Metals Company Extraction of alumina from bauxite ores
JPS5976598A (en) * 1982-10-25 1984-05-01 Mitsubishi Gas Chem Co Inc Scale inhibiting agent
GB8824176D0 (en) * 1988-10-14 1988-11-23 Allied Colloids Ltd Recovery of alumina from bauxite
GB8907995D0 (en) * 1989-04-10 1989-05-24 Allied Colloids Ltd Recovery of alumina trihydrate in the bayer process
DE69125659T2 (en) * 1990-06-25 1997-07-31 Nalco Australia Modification of crystal growth
US5091159A (en) * 1991-06-10 1992-02-25 Nalco Chemical Company Use of dextran as a filtration aid for thickener overflow filtration in Kelly filters in the Bayer process
US5217620A (en) * 1992-11-23 1993-06-08 Nalco Chemical Company Clarification aid for the Bayer process

Also Published As

Publication number Publication date
EP1044164A4 (en) 2002-09-04
AUPP084997A0 (en) 1998-01-08
WO1999029626A1 (en) 1999-06-17
AU1813599A (en) 1999-06-28
EP1044164A1 (en) 2000-10-18

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Legal Events

Date Code Title Description
B07A Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]
B09B Patent application refused [chapter 9.2 patent gazette]

Free format text: INDEFERIDO O PRESENTE PEDIDO DE PATENTE COMO INVENCAO - DE ACORDO COM O ART. 8O DA LPI.