WO2012017315A1 - Procédé de séchage d'un gâteau de boues au moyen des gaz d'échappement d'un four de calcination - Google Patents

Procédé de séchage d'un gâteau de boues au moyen des gaz d'échappement d'un four de calcination Download PDF

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Publication number
WO2012017315A1
WO2012017315A1 PCT/IB2011/001979 IB2011001979W WO2012017315A1 WO 2012017315 A1 WO2012017315 A1 WO 2012017315A1 IB 2011001979 W IB2011001979 W IB 2011001979W WO 2012017315 A1 WO2012017315 A1 WO 2012017315A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gases
hot exhaust
filter
calciner system
vacuum filter
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.)
Ceased
Application number
PCT/IB2011/001979
Other languages
English (en)
Inventor
Manfred Bach
Benny E. Raahauge
Franz Tomasko
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.)
FLSmidth AS
Original Assignee
FLSmidth AS
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 FLSmidth AS filed Critical FLSmidth AS
Publication of WO2012017315A1 publication Critical patent/WO2012017315A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
    • B01D29/84—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating
    • B01D29/843—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating by direct contact with a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/66—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating
    • B01D33/663—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating by direct contact with a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/20—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/25—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/12—Drying solid materials or objects by processes not involving the application of heat by suction

Definitions

  • the present invention relates to a method for dewatering a filter cake in a vacuum filter subject to simultaneous supply of steam-laden gases where the filter cake is subsequently calcined in a calciner system through heat exchange with hot exhaust gases.
  • the invention further relates to a plant for carrying out the method according to the invention.
  • This is obtained by a method of the kind mentioned in the introduction and being characterized in that the steam-laden gases comprise hot exhaust gases from the subsequent calciner system.
  • the filter cake can be dewatered at significantly lower costs to essentially the same residual moisture as attainable for known devices. This is due to the fact that the need for specialized processing equipment for producing steam is eliminated by utilization of hot exhaust gases from the calciner system.
  • the exhaust gases from the calciner system will typically have a relative humidity of approximately 50 per cent and therefore contain less potential condensation heat than saturated steam traditionally used. Therefore, it may be advantageous to add a fluid in the form of filtrate, water or the like into the exhaust gases from the calciner system before they are introduced to the vacuum filter.
  • the plant for carrying out the method comprises a vacuum filter for dewatering of filter cake subject to simultaneous supply of steam-laden gases as well as a calciner system for calcination of filter cake through heat exchange with hot exhaust gases and being characterized in that it further comprises means for conveying hot exhaust gases from the calciner system to the vacuum filter.
  • the plant may further comprise means for introducing filtrate, water or similar fluid into the exhaust gases from the calciner system before they are fed to the vacuum filter.
  • FIG. 1 a block diagram of a plant for manufacturing alumina, with said plant comprising a vacuum filter 1 and a calciner system 2.
  • the vacuum filter may be constituted by a so-called horizontal Pan Filter which is marketed by FLSmidth A/S, and which by using a horizontally rotating table provides continuous filtration, washing and dewatering of the processed filter cake, but in principle the vacuum filter 1 may be constituted by any suitable vacuum filter, such as a belt vacuum filter.
  • the vacuum filter 1 comprises a steam casing 3 over the section of the filter which is designed for carrying out final dewatering of the filter cake so that steam-laden gases via a duct 4 can be introduced to this section.
  • the shown calciner system 2 comprises a cyclone preheater 5 and a calciner 6 in which the dewatered filter cake from the vacuum filter 1 while suspended in hot gases is preheated and calcined into alumina.
  • the calcined alumina is subsequently cooled in a not shown cooler system.
  • the gases are drawn through the calciner system 2 by means of a fan 7 and dedusted in a filter apparatus 8, such as an electrostatic precipitator, a bag filter or a similar apparatus, before they are vented to a stack 9.
  • the hot exhaust gases from the calciner system 2.
  • the exhaust gases may be extracted directly from a location in the calciner system per se, but in order to limit the amount of exhaust gas pollutants fed to the vacuum filter 1 it is preferred that the exhaust gases are extracted via a duct 0 from a location after the filter apparatus 8 by means of a separate fan 11.
  • the gases extracted via the duct 10 which typically have a relative humidity of approximately 50 per cent may be fed directly into the vacuum filter 1.
  • a filtrate, water or similar fluids may be added. This may for example take place in a compartment 12, as shown.
  • the exhaust gases from the vacuum filter 1 may via a vacuum filter pump 13 be directed to the suction side of the fan 7 through a duct 14.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention porte sur un procédé et sur une installation pour déshydrater un gâteau de boues dans un filtre à vide (1) qui subit une alimentation simultanée de gaz chargé de vapeur, le gâteau de boue étant ensuite calciné dans un système de four de calcination (2) par échange de chaleur avec des gaz d'échappement chauds. Le procédé et l'installation sont particuliers en ce sens que les gaz chargés de vapeur comprennent des gaz d'échappement chauds issus d'un système de four de calcination aval. On obtient de cette façon que le gâteau de boue peut être déshydraté à des coûts significativement inférieurs et sensiblement à la même humidité résiduelle que ce qu'on peut obtenir à l'aide des dispositifs connus. Ceci est dû au fait que la nécessité d'un équipement de traitement spécialisé pour produire la vapeur est supprimée puisqu'on utilise des gaz d'échappement chauds en provenance du système de four de calcination.
PCT/IB2011/001979 2010-08-04 2011-08-04 Procédé de séchage d'un gâteau de boues au moyen des gaz d'échappement d'un four de calcination Ceased WO2012017315A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201000695 2010-08-04
DKPA201000695 2010-08-04

Publications (1)

Publication Number Publication Date
WO2012017315A1 true WO2012017315A1 (fr) 2012-02-09

Family

ID=44720922

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/001979 Ceased WO2012017315A1 (fr) 2010-08-04 2011-08-04 Procédé de séchage d'un gâteau de boues au moyen des gaz d'échappement d'un four de calcination

Country Status (1)

Country Link
WO (1) WO2012017315A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185984A1 (fr) * 2012-06-12 2013-12-19 Andritz Fliessbett Systeme GmbH Procédé et installation pour séparer mécaniquement un solide d'un mélange solide-liquide et pour traiter ensuite le solide thermiquement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672067A (en) * 1970-10-30 1972-06-27 Envirotech Corp Method for steam drying filter cake
GB1465880A (en) * 1974-07-02 1977-03-02 Quigley Co Manufacture of magnesia
US4115265A (en) * 1975-12-24 1978-09-19 Klockner-Humboldt-Deutz Aktiengesellschaft Method and apparatus for dehydrating suspension
US4299560A (en) * 1979-04-24 1981-11-10 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Combustion control system for burning installation with calcining burner
US5527458A (en) * 1993-10-28 1996-06-18 Bayer Aktiengesellschaft Device for continuous filtration and drying of a solid suspension
DE19800881A1 (de) * 1998-01-13 1999-07-15 Metallgesellschaft Ag Verfahren zur Herstellung von TiO¶2¶ nach dem Sulfatverfahren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672067A (en) * 1970-10-30 1972-06-27 Envirotech Corp Method for steam drying filter cake
GB1465880A (en) * 1974-07-02 1977-03-02 Quigley Co Manufacture of magnesia
US4115265A (en) * 1975-12-24 1978-09-19 Klockner-Humboldt-Deutz Aktiengesellschaft Method and apparatus for dehydrating suspension
US4299560A (en) * 1979-04-24 1981-11-10 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Combustion control system for burning installation with calcining burner
US5527458A (en) * 1993-10-28 1996-06-18 Bayer Aktiengesellschaft Device for continuous filtration and drying of a solid suspension
DE19800881A1 (de) * 1998-01-13 1999-07-15 Metallgesellschaft Ag Verfahren zur Herstellung von TiO¶2¶ nach dem Sulfatverfahren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185984A1 (fr) * 2012-06-12 2013-12-19 Andritz Fliessbett Systeme GmbH Procédé et installation pour séparer mécaniquement un solide d'un mélange solide-liquide et pour traiter ensuite le solide thermiquement

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