WO1994021391A1 - Procede perfectionne ne nuisant pas a l'environnement de manipulation et d'utilisation d'effluents de combustion du charbon dans les grands sites industriels - Google Patents

Procede perfectionne ne nuisant pas a l'environnement de manipulation et d'utilisation d'effluents de combustion du charbon dans les grands sites industriels Download PDF

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Publication number
WO1994021391A1
WO1994021391A1 PCT/AU1994/000127 AU9400127W WO9421391A1 WO 1994021391 A1 WO1994021391 A1 WO 1994021391A1 AU 9400127 W AU9400127 W AU 9400127W WO 9421391 A1 WO9421391 A1 WO 9421391A1
Authority
WO
WIPO (PCT)
Prior art keywords
flyash
particles
main
ash
polluting
Prior art date
Application number
PCT/AU1994/000127
Other languages
English (en)
Inventor
Anthony Gilbert Martin
Original Assignee
Anthony Gilbert Martin
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
Priority claimed from AU34038/93A external-priority patent/AU645477B3/en
Application filed by Anthony Gilbert Martin filed Critical Anthony Gilbert Martin
Priority to AU62793/94A priority Critical patent/AU6279394A/en
Publication of WO1994021391A1 publication Critical patent/WO1994021391A1/fr
Priority to GB9518376A priority patent/GB9518376D0/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • This invention is an improvement in the current process of handling effluent (flyash) from the burning of coal to generate electricity or for other industrial operations.
  • the effluent from the burning of coal in large industrial operations like electricity generating power stations causes enormous uncontrolled air and water pollution from where the ash is dumped because it is not currently known, in an economically viable manner, how to separate the flyash, inside the industrial coal burning operation itself, into air polluting flyash, water polluting flyash and non air nor water polluting flyash.
  • the invention is irected to first keeping the light weight air polluting flyash separate rather than remixing them with the main flyash and or bottom ash as is the current process, then magnetically treating the main flyash without the remixed light weight flyash to remove the water polluting trace elements, which occur as contaminants of the magnetic as opposed to the non magnetic portion (subsequently converted to aerated concrete) of the main flyash.
  • the current process involves the remixing of the light weight flyash with the main flyash and or bottom ash and then sluicing or water conditioning the remixed flyash and or bottom ash for disposal into ash ponds or ash disposal pits.
  • the invention is described in detail in relation to effluent from coal burning from coal burning electricity generating power stations, but the invention is equally applicable to effluent from coal burning from other large industrial operations.
  • cenospheres or floaters found at the top of ash ponds have commercial value. They have been harvested from a few selected ash ponds around the world for the last 30 years. The return to the few power stations from the sale of their floaters to industry has been in the order of around $10,000 per year for an extraction of generally less than 100 tonnes per year. These returns and quantities are irrelevant in the context of the total ash involved. Some power stations have also sold their bottom ash (residuals in the boiler itself) as coarse aggregates for a return of less than $5 per tonne. Again these returns and quantities are irrelevant in the context of the total ash involved. It has been known to the flyash industry that certain flyashes contain magnetite.
  • This invention is the result of ten years of studying flyash, its chemical properties, its sizes and its specific gravities. Studying where a particular type of flyash particle occurs in the power station and in what manner the particles should be extracted so that it is within the constraints of the overall power station design and particularly the ash handling part. Studying what relevance particles extracted from flyash have to various niche markets.
  • flyash Since to date the main use of flyash has been in the cement substitution market, flyash is almost always described with respect to cement i.e. as a fine particle product with about 70% by weight having a diameter of minus 45 micron, an average specific gravity of around 2 and a loss on ignition of around 1% from modem power stations.
  • This invention discloses that flyash consists of a spectrum of particles with specific gravities in the range between 0.3 to 8.0 and sizes ranging from 0.3 micron to 1000, micron in diameter and that these properties rather than flyash's relationship to cement are the critical properties from an environmental and commercial point of view.
  • Power stations are currently equipped to handle flyash in a dry as well as in a wet state but not equipped or designed to separate the flyash into air polluting portion, water polluting portion and non air nor water polluting portion.
  • This innovation is an improvement in the flyash handling part of the power station. Incorporation of this innovation will not only give the power station a net return (rather than net cost currently) of some millions of dollars per year handling about a million tonnes of flyash per year, but more importantly from an environmental stance, the flyash would be separated into air polluting portion, water polluting portion and non air nor water polluting portion at the power station itself and thus avoid the current uncontrolled separation of the flyash in an environmentally dangerous fashion at the ash disposal area.
  • economiser bins In modem power stations the early release ash particles accumulate at the higher levels of the power stations into containers known generally as economiser bins - generally four bins.
  • the flyash from the economiser bins is currently piped downwards and remixed with the main flyash (collected in hundreds of bins generally at ground level) and/or bottom ash and disposed of into ash ponds or old mine sites, from which it becomes air bome and causes the major air pollution.
  • most of the air polluting (light weight) particles accumulate in the economiser bins.
  • the particles in the economiser bins are predominantly very light weight particles with specific gravities in the range between 0.3 and 1.2 and have great commercial value.
  • Approximately 5% to 15% of the total flyash produced accumulates in the economiser bins, from an environmental and commercial point of view these particles should be separated out and harvested (not remixed as is currently done) in the following fashions.
  • flyash The chemical composition of flyash varies depending on the type of coal used at the various power stations. Generally about 80% - 97% of flyash consists of alumino silicate particles, and between 3% - 20% consists of various oxides of iron, calcium, magnesium, titanium, sulphur etc. But flyash also contains (this is known) a large number of dangerous trace elements like barium, strontium, chromium, vanadium, nickel, copper, lead, zinc, zirconium, yitrium, molibdenum, lanthanum, arsenic, tin, niobium, tantalum, tungsten, cobalt etc. Each of these dangerous heavy trace elements varies in weight from less than 0.002% to .2% of the total flyash.
  • flyash collecting bins In modem large power stations some 700,000 tonnes of flyash are collected in the main flyash collecting bins currently situated at ground level. These bins should be positioned at the highest level feasible, around 5 to 10 metres high. Flyash from these bins should then be gravity fed to run over a number of dry magnetic drum separators which will separate the flyash into a magnetic portion containing the environmentally dangerous trace elements (bagged for sale) and a non-magnetic portion containing very little environmentally dangerous trace elements, for wet or semi dry disposal or conversion into aerated concrete products as per this innovation.
  • the actual dry magnetic separation technology adopted will have to be fine tuned for the particular fineness of flyash encountered at the various power stations.
  • Dry fresh flyash should be conditioned with just the right amount of water and a bonding agent like cement such that the aeration between the particles is not destroyed and the conditioned flyash has the plasticity similar to clay.
  • the amount of water to be added will vary greatly from flyash to flyash, but it can be seen with the naked eye when excess water has been introduced and the aeration between the particles of the flyash has been destroyed without being able to be restored again.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Dans les centrales thermiques modernes au charbon, environ 20 % du charbon brûlé termine en effluent résiduel se présentant généralement sous forme de cendres volantes ou de cendres résiduelles. La plupart voire la totalité de ces résidus qui représentent jusqu'à 1 000 000 tonnes par an par centrale thermique sont déchargésdans des fonds de cendres énormes répartis dans le monde, depuis lesquels ils posent de graves problèmes de pollution de l'air et de l'eau. Les autorités chargées de la protection de l'environnement à travers le monde, bien qu'elles en mesurent la gravité, ont toléré jusqu'à maintenant ce problème écologique faute de solution pratique. Le procédé selon l'invention montre comment on peut améliorer les conditions de manipulation des cendres dans les centrales thermiques de manière à extraire les particules de grande valeur et les vendre sur place, en séparant d'abord les cendres volantes légères polluant l'air au lieu de les mélanger avec les cendres volantes principales, en traitant magnétiquement à sec les cendres volantes principales de manière à extraire les éléments de trace polluant l'eau, et finalement en utilisant l'aération entre et dans les particules de la partie résiduelle non magnétique des cendres volantes principales en les conditionnant avec un agent de liaison de manière à former un béton cellulaire.
PCT/AU1994/000127 1993-03-08 1994-03-07 Procede perfectionne ne nuisant pas a l'environnement de manipulation et d'utilisation d'effluents de combustion du charbon dans les grands sites industriels WO1994021391A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU62793/94A AU6279394A (en) 1993-03-08 1994-03-07 An environmentally sound method of handling and utilizing effluent from the burning of coal in large industrial operations
GB9518376A GB9518376D0 (en) 1993-03-08 1995-09-08 An environmentally sound method of handling and utilizing effluent from the burning of coal in large industrial operations

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPL7661 1993-03-08
AU34038/93A AU645477B3 (en) 1993-03-08 1993-03-08 An improved environmentally sound method of handling and utilising effluents from the burning of coal in large industrial operations
AU34038/93 1993-03-08
AUPL766193 1993-03-08

Publications (1)

Publication Number Publication Date
WO1994021391A1 true WO1994021391A1 (fr) 1994-09-29

Family

ID=25622698

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1994/000127 WO1994021391A1 (fr) 1993-03-08 1994-03-07 Procede perfectionne ne nuisant pas a l'environnement de manipulation et d'utilisation d'effluents de combustion du charbon dans les grands sites industriels

Country Status (2)

Country Link
GB (1) GB9518376D0 (fr)
WO (1) WO1994021391A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2700608C1 (ru) * 2018-09-09 2019-09-18 Общество с ограниченной ответственностью "Малое инновационное предприятие "Модификация цементных систем" (ООО "МИП "МЦС") Технологическая линия для переработки золошлаковых отходов из отвалов систем золоудаления тепловых электростанций с целью получения кондиционных зольных продуктов
RU2700612C1 (ru) * 2018-09-09 2019-09-18 Общество с ограниченной ответственностью "Малое инновационное предприятие "Модификация цементных систем" (ООО "МИП "МЦС") Способ переработки золошлаковых отходов из отвалов системы гидрозолоудаления тепловых электростанций с целью получения кондиционных зольных продуктов и кондиционный зольный продукт

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4625268A (en) * 1968-11-14 1970-05-21 Process forthe treatment of fly ash and product
DD217961A3 (de) * 1981-10-29 1985-01-23 Orgreb Inst Kraftwerke Verfahren zur aufbereitung von industrierueckstaenden insbesondere von kraftwerksasche
EP0310539A2 (fr) * 1987-10-02 1989-04-05 Noell GmbH Procédé et dispositif de traitement des cendres volantes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4625268A (en) * 1968-11-14 1970-05-21 Process forthe treatment of fly ash and product
DD217961A3 (de) * 1981-10-29 1985-01-23 Orgreb Inst Kraftwerke Verfahren zur aufbereitung von industrierueckstaenden insbesondere von kraftwerksasche
EP0310539A2 (fr) * 1987-10-02 1989-04-05 Noell GmbH Procédé et dispositif de traitement des cendres volantes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2700608C1 (ru) * 2018-09-09 2019-09-18 Общество с ограниченной ответственностью "Малое инновационное предприятие "Модификация цементных систем" (ООО "МИП "МЦС") Технологическая линия для переработки золошлаковых отходов из отвалов систем золоудаления тепловых электростанций с целью получения кондиционных зольных продуктов
RU2700612C1 (ru) * 2018-09-09 2019-09-18 Общество с ограниченной ответственностью "Малое инновационное предприятие "Модификация цементных систем" (ООО "МИП "МЦС") Способ переработки золошлаковых отходов из отвалов системы гидрозолоудаления тепловых электростанций с целью получения кондиционных зольных продуктов и кондиционный зольный продукт

Also Published As

Publication number Publication date
GB9518376D0 (en) 1995-11-29

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