EP0086129B1 - Aqueous suspensions containing at least one solid combustible, and process for their preparation - Google Patents

Aqueous suspensions containing at least one solid combustible, and process for their preparation Download PDF

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EP0086129B1
EP0086129B1 EP83400145A EP83400145A EP0086129B1 EP 0086129 B1 EP0086129 B1 EP 0086129B1 EP 83400145 A EP83400145 A EP 83400145A EP 83400145 A EP83400145 A EP 83400145A EP 0086129 B1 EP0086129 B1 EP 0086129B1
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solid combustible
aqueous suspensions
grinding
alkaline metal
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EP0086129A1 (en
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Jean-Louis Merry
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Charbonnages de France CDF
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Charbonnages de France CDF
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • C10L1/326—Coal-water suspensions

Definitions

  • the present invention relates to aqueous suspensions of at least one solid fuel and a process for their preparation. These suspensions are remarkably stable and can be used in particular as fuel or for their gasification.
  • aqueous suspensions containing at least 60% by weight of at least one solid fuel which are stable on storage and can be pumped and dispersed in burners without particular difficulties.
  • Surfactants also called surfactants or detergents or surfactants, are, as is known, compounds capable of modifying the surface tension of the medium by giving it wettability properties. These are molecules with groups of marked hydrophilic and hydrophobic nature. They may be anionic surfactants (for example alkali metal alkylarylsulfonates), cationic (for example quaternary ammonium salts) or nonionic (for example polyether oxides).
  • anionic surfactants for example alkali metal alkylarylsulfonates
  • cationic for example quaternary ammonium salts
  • nonionic for example polyether oxides
  • the preferred surfactants for the present invention are alkali metal alkylarylsulfonates, for example sodium alkyl naphthalenesulfonates.
  • Dispersants also called deflocculants, are compounds capable of creating or amplifying the formation of electrical charges of the same sign on the surface of solid fuel particles. They therefore promote the creation of repulsion forces of an electrical nature between these particles.
  • the alkali metal silicates in particular the metasilicates
  • the alkali metal polyphosphates and the alkaline salts of organic polyacids (in particular the polyacrylates) are used.
  • Anionic surfactants and in particular alkali metal alkylarylsulfonates also have dispersing properties. However, they are insufficient to allow these products to be used alone in the suspensions which are the subject of the invention.
  • Gelling agents are compounds capable of forming colloidal solutions or suspensions of a thixotropic nature in water. They therefore give the suspensions of solid fuels in water a high viscosity at rest without affecting their pumpability and dispersibility properties in the burners.
  • Cellulose ethers are advantageously used, for example carboxymethylcellulose or methylcellulose.
  • the solid fuel is present in the aqueous suspensions according to the invention in the ground state so that 80% by weight of the grains have a dimension of less than 80 micrometers.
  • the aqueous suspensions present combustion difficulties, and that if more than 80% of the grains have a dimension less than 80 microns, the suspensions obtained are difficult to pump.
  • the grinding operation is such that 80% by weight of the solid fuel grains have a dimension of less than 80 micrometers.
  • the amount of water added during the implementation of the process is such that an aqueous suspension of solid fuel is obtained containing from 60 to 80% by weight of solid fuel.
  • aqueous suspensions according to the invention can also be obtained by dispersion of dry solid fuel in water.
  • wet grinding in the liquid phase is preferred because it does not present the risks of explosion inherent in dry grinding and does not require prior drying of the solid fuel.
  • agents facilitating the comminution of solid fuel Such additives get into the cracks of the solid fuel during grinding and prevent them from closing, thus acting as fracturing or embrittling agents.
  • tetraline pyridine, ethanolamine, acrylonitrile, orthocyclohexylphenol, sodium silicoaluminate.
  • An interesting raw material for the preparation of the suspensions according to the invention consists of the schlamms of coal washers which constitute an already divided product and which hardly currently has any other application than on-site combustion.
  • a particular mode of preparation of the suspensions according to the invention consists, beforehand, in subjecting the schlamms to a purification treatment, for example by flotation, in order to bring their content of non-combustible residue to a value of less than 10% and preferably of the order of 6 to 8% (expressed by weight relative to dry coal), then subjecting them to additional grinding in a liquid medium until their particle size is brought to a value such that 80% by weight of the grains have a dimension less than 80 micrometers, and to add, before or during grinding, water and the additives described above so as to produce a final product preferably containing from 60 to 80% by weight of carbon.
  • Coal washing schlamms obtained from Freyming charcoal (flaming fatty) are subjected to a flotation treatment in the presence of 400 grams per tonne of a mixture containing 25% methylisobutylcarbinol and 75% light fuel oil. Said flotation treatment is followed by filtration or centrifugation and sieving; a carbon is thus obtained at 15% water and 6% ash (expressed by weight relative to dry coal).
  • the suspension obtained has a viscosity at rest which gives it great stability on storage.
  • the rheogram of the product shows that it shears around 2 S - 1 and that the viscosity, after shearing for 2 minutes at 100 S - 1 , is 670 mPa.s (centipoises).
  • This product was burned in an experimental boiler with a power of 1 megawatt thermal equipped with a burner as described in FR-A-2 054 741 with an excess of air of 20%.
  • the thermal combustion efficiency is 80.3% against 89.2% for combustion of dry pulverized coal burning under the same conditions, a difference of only 8.9%.
  • the viscosities measured were, in the first case of 652 mPa.s (centipoise), in the second case of 670 mPa.s (centipoise), in the third case of 380 mPa.s (centipoise).

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Detergent Compositions (AREA)
  • Fireproofing Substances (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Description

La présente invention concerne des suspensions aqueuses d'au moins un combustible solide et un procédé pour leur préparation. Ces suspensions sont ramarquablement stables et peuvent être utilisées notamment comme combustible ou en vue de leur gazéification.The present invention relates to aqueous suspensions of at least one solid fuel and a process for their preparation. These suspensions are remarkably stable and can be used in particular as fuel or for their gasification.

Les tentatives actuelles pour subsituer les combustibles solides aux combustibles liquides dérivés du pétrole se heurtent aux difficultés de stockage, de manutention et de mise en oeuvre inhérentes aux combustibles solides. On a déjà proposé d'y remédier en utilisant, par exemple, le charbon soit sous forme pulvérisée, soit sous forme dispersée dans un liquide. Le charbon pulvérisé a l'inconvénient d'être dangereux à manipuler et à mettre en oeuvre, à cause de ses caractéristiques d'inflammabilité et d'explosibilité. Les suspensions de charbon dans les combustibles liquides tels que le fuel présentent les mêmes problèmes de stockage que les combustibles d'origine pétrolière et, de plus, ne peuvent généralement pas être pompées et mises en oeuvre sans être préalablement réchauffées. Au contraire, les suspensions de charbon dans l'eau ne sont pas inflammables au stockage et peuvent être pompées et utilisées dans des brûleurs sans être préalablement réchauffées. L'emploi de telles suspensions comme combustible est donc particulièrement avantageux. Toutefois, pour présenter les mêmes avantages que les combustibles liquides classiques, ces suspensions doivent contenir au moins 60% en poids de charbon, être parfaitement stables au stockage et pouvoir être pompées et dispersées par les brûleurs sans difficultés particulières.Current attempts to substitute solid fuels for petroleum-based liquid fuels are encountering the storage, handling and processing difficulties inherent in solid fuels. It has already been proposed to remedy this by using, for example, charcoal either in pulverized form or in dispersed form in a liquid. The pulverized coal has the disadvantage of being dangerous to handle and to use, because of its flammability and explosiveness characteristics. Coal suspensions in liquid fuels such as fuel oil present the same storage problems as fuels of petroleum origin and, moreover, generally cannot be pumped and used without being previously heated. On the contrary, coal suspensions in water are not flammable during storage and can be pumped and used in burners without being preheated. The use of such suspensions as fuel is therefore particularly advantageous. However, to have the same advantages as conventional liquid fuels, these suspensions must contain at least 60% by weight of coal, be perfectly stable during storage and be able to be pumped and dispersed by the burners without particular difficulties.

On a déjà proposé l'utilisation de suspensions de charbon dans l'eau comme combustible. Les mélanges qui ont été proposés jusqu'à maintenant obtiennent leur stabilité au stockage soit grâce à une répartition granulométrique particulière, soit grâce à la présence de divers additifs agissant notamment comme dispersants. Toutefois, l'obtention d'une répartition granulométrique particulière est une opération relativement coûteuse; par ailleurs les indications données dans les textes de l'art antérieur sur les divers additifs utilisables ne permettent pas d'obtenir des suspensions ayant une stabilité suffisante.The use of suspensions of coal in water as a fuel has already been proposed. The mixtures which have been proposed up to now obtain their storage stability either thanks to a particular particle size distribution, or thanks to the presence of various additives which act in particular as dispersants. However, obtaining a particular particle size distribution is a relatively expensive operation; moreover, the indications given in the texts of the prior art on the various additives which can be used do not make it possible to obtain suspensions having sufficient stability.

Le demandeur a maintenant trouvé des suspensions aqueuses contenant au moins 60% en poids d'au moins un combustible solide, qui sont stables au stockage et peuvent être pompées et dispersées dans des brûleurs sans difficultés particulières.The applicant has now found aqueous suspensions containing at least 60% by weight of at least one solid fuel, which are stable on storage and can be pumped and dispersed in burners without particular difficulties.

Un objet de l'invention concerne des suspensions aqueuses contenant au moins 60% en poids d'au moins un combustible solide, caractérisées en ce qu'elles contiennent:

  • - de 0,01 à 1 % en poids d'au moins un agent tensio-actif
  • - de 0,01 à 1 % en poids d'au moins un dispersant choisi parmi les silicates de métal alcalin, les polyphosphates de métal alcalin et les sels alcalins de polyacides organiques, et
  • - de 0,01 à 0,1 % en poids d'au moins un gélifiant. Le combustible solide est choisi, par exemple, parmi le charbon, le lignite, les brais de houille ou de pétrole, et leurs mélanges.
An object of the invention relates to aqueous suspensions containing at least 60% by weight of at least one solid fuel, characterized in that they contain:
  • - from 0.01 to 1% by weight of at least one surfactant
  • from 0.01 to 1% by weight of at least one dispersant chosen from alkali metal silicates, alkali metal polyphosphates and alkali salts of organic polyacids, and
  • - from 0.01 to 0.1% by weight of at least one gelling agent. The solid fuel is chosen, for example, from coal, lignite, coal or petroleum pitches, and their mixtures.

Les agents tensio-actifs, encore appelés agents de surface ou détergents ou surfactants, sont, comme il est connu, des composés susceptibles de modifier la tension superficielle du milieu en lui conférant des propriétés de mouillabilité. Ce sont des molécules possédant des groupements à caractère hydrophile et hydrophobe marqué. Il peut s'agir d'agents tensio-actifs anioniques (par exemple les alkylarylsulfonates de métal alcalin), cationiques (par exemple des sels d'ammonium quaternaire) ou non ioniques (par exemple des polyéthers oxydes). Les tensio-actifs préférés pour la présente invention sont les alkylarylsulfonates de métal alcalin, par exemple les alkyl- naphtalènesulfonates de sodium.Surfactants, also called surfactants or detergents or surfactants, are, as is known, compounds capable of modifying the surface tension of the medium by giving it wettability properties. These are molecules with groups of marked hydrophilic and hydrophobic nature. They may be anionic surfactants (for example alkali metal alkylarylsulfonates), cationic (for example quaternary ammonium salts) or nonionic (for example polyether oxides). The preferred surfactants for the present invention are alkali metal alkylarylsulfonates, for example sodium alkyl naphthalenesulfonates.

Les dispersants, encore appelés défloculants, sont des composés capables de créer ou d'amplifier la formation de charges électriques de même signe à la surface des particules de combustible solide. Ils favorisent donc la création de forces de répulsion de nature électrique entre ces particules. Selon l'invention on utilise les silicates de métal alcalin (notamment les métasilicates), les polyphosphates de métal alcalin et les sels alcalins de polyacides organiques (notamment les polyacrylates).Dispersants, also called deflocculants, are compounds capable of creating or amplifying the formation of electrical charges of the same sign on the surface of solid fuel particles. They therefore promote the creation of repulsion forces of an electrical nature between these particles. According to the invention, the alkali metal silicates (in particular the metasilicates), the alkali metal polyphosphates and the alkaline salts of organic polyacids (in particular the polyacrylates) are used.

Les agents tensio-actifs anioniques et en particulier les alkylarylsulfonates de métal alcalin ont également des propriétés dispersantes. Elles sont toutefois insuffisantes pour permettre à ces produits d'être utilisés seuls dans les suspensions faisant l'objet de l'invention.Anionic surfactants and in particular alkali metal alkylarylsulfonates also have dispersing properties. However, they are insufficient to allow these products to be used alone in the suspensions which are the subject of the invention.

Les gélifiants sont des composés susceptibles de former dans l'eau des solutions ou des suspensions colloïdales à caractère thixotropique. Ils confèrent par conséquent aux suspensions de combustibles solides dans l'eau une forte viscosité au repos sans nuire à leurs propriétés de pompabilité et de dispersi- bilité dans les brûleurs. On utilise avantageusement les éthers de cellulose, par exemple la carboxymé- thylcellulose ou la méthylcellulose.Gelling agents are compounds capable of forming colloidal solutions or suspensions of a thixotropic nature in water. They therefore give the suspensions of solid fuels in water a high viscosity at rest without affecting their pumpability and dispersibility properties in the burners. Cellulose ethers are advantageously used, for example carboxymethylcellulose or methylcellulose.

Avantageusement le combustible solide est présent dans les suspensions aqueuses selon l'invention à l'état broyé de telle façon que 80% en poids des grains aient une dimension inférieure à 80 micro-mètres. En effet on a constaté que si 80% des grains ont.une dimension supérieure à 80 micro-mètres, les suspensions aqueuses présentent des difficultés de combustion, et que si plus de 80% des grains ont une dimension inférieure à 80 micro-mètres les suspensions obtenues sont difficilement pompables.Advantageously, the solid fuel is present in the aqueous suspensions according to the invention in the ground state so that 80% by weight of the grains have a dimension of less than 80 micrometers. In fact, it has been observed that if 80% of the grains have a dimension greater than 80 microns, the aqueous suspensions present combustion difficulties, and that if more than 80% of the grains have a dimension less than 80 microns, the suspensions obtained are difficult to pump.

Un autre objet de l'invention concerne un procédé de préparation des suspensions décrites ci-dessus. Ce procédé consiste à broyer le combustible solide en milieu humide et à ajouter au mélange de combustible solide et d'eau, avant, pendant ou après le broyage:

  • - de 0,01 à 1 % en poids d'au moins un agent tensio-actif
  • - de 0,01 à 1 % en poids d'au moins un dispersant choisi parmi les silicates de métal alcalin, les polyphosphates de métal alcalin et les sels alcalins de polyacides organiques, et
  • - de 0,01 à 0,1% en poids d'au moins un gélifiant, et
  • - de l'eau en quantité suffisante pour que la suspension obtenue contienne au moins 60% en poids de combustible solide.
Another subject of the invention relates to a process for the preparation of the suspensions described above. This process consists of grinding solid fuel in a humid environment and adding to the mixture of solid fuel and water, before, during or after grinding:
  • - from 0.01 to 1% by weight of at least one surfactant
  • from 0.01 to 1% by weight of at least one dispersant chosen from alkali metal silicates, alkali metal polyphosphates and alkali salts of organic polyacids, and
  • - from 0.01 to 0.1% by weight of at least one gelling agent, and
  • - Water in sufficient quantity for the suspension obtained to contain at least 60% by weight of solid fuel.

Avantageusement l'opération de broyage est telle que 80% en poids des grains de combustible solide aient une dimension inférieure à 80 micro-mètres.Advantageously, the grinding operation is such that 80% by weight of the solid fuel grains have a dimension of less than 80 micrometers.

Avantageusement la quantité d'eau ajoutée pendant la mise en oeuvre du procédé est telle que l'on obtienne une suspension aqueuse de combustible solide contenant de 60 à 80% en poids de combustible solide.Advantageously, the amount of water added during the implementation of the process is such that an aqueous suspension of solid fuel is obtained containing from 60 to 80% by weight of solid fuel.

Les suspensions aqueuses selon l'invention peuvent également être obtenues par dispersion de combustible solide sec dans l'eau.The aqueous suspensions according to the invention can also be obtained by dispersion of dry solid fuel in water.

Le broyage humide en phase liquide est préféré car il ne présente pas les risques d'explosion inhérents au broyage à sec et ne nécessite pas un séchage préalable du combustible solide. D'autre part, il permet de réduire l'énergie nécessaire au broyage quand il est réalisé, comme il est connu en soi, en présence d'agents facilitant la comminution du combustible solide. De tels additifs s'introduisent dans les fissures du combustible solide au cours du broyage et les empêchent de se refermer, agissant par conséquent comme agents fracturants ou fragilisants. Parmi les additifs ayant cette propriété ont peut citer la tétra- line, la pyridine, l'éthanolamine, l'acrylonitrile, l'or- thocyclohexylphénol, le silicoaluminate de sodium.Wet grinding in the liquid phase is preferred because it does not present the risks of explosion inherent in dry grinding and does not require prior drying of the solid fuel. On the other hand, it makes it possible to reduce the energy necessary for grinding when it is carried out, as it is known per se, in the presence of agents facilitating the comminution of solid fuel. Such additives get into the cracks of the solid fuel during grinding and prevent them from closing, thus acting as fracturing or embrittling agents. Among the additives having this property, mention may be made of tetraline, pyridine, ethanolamine, acrylonitrile, orthocyclohexylphenol, sodium silicoaluminate.

Une matière première intéressante pour la préparation des suspensions selon l'invention est constituée par les schlamms de lavoirs à charbon qui constituent un produit déjà divisé et n'ayant guère actuellement d'autre application que la combustion sur place.An interesting raw material for the preparation of the suspensions according to the invention consists of the schlamms of coal washers which constitute an already divided product and which hardly currently has any other application than on-site combustion.

Un mode particulier de préparation des suspensions selon l'invention consiste, au préalable, à soumettre les schlamms à un traitement d'épuration, par exemple par flottation, pour amener leur teneur en résidu non combustible à une valeur inférieure à 10% et de préférence de l'ordre de 6 à 8% (exprimée en poids par rapport au charbon sec), puis à les soumettre à un broyage complémentaire en milieu liquide jusqu'à amener leur granulométrie à une valeur telle que 80% en poids des grains aient une dimension inférieure à 80 micro-mètres, et à ajouter, avant ou pendant le broyage, de l'eau et les additifs décrits ci-dessus de manière à réaliser un produit final contenant de préférence de 60 à 80% en poids de charbon.A particular mode of preparation of the suspensions according to the invention consists, beforehand, in subjecting the schlamms to a purification treatment, for example by flotation, in order to bring their content of non-combustible residue to a value of less than 10% and preferably of the order of 6 to 8% (expressed by weight relative to dry coal), then subjecting them to additional grinding in a liquid medium until their particle size is brought to a value such that 80% by weight of the grains have a dimension less than 80 micrometers, and to add, before or during grinding, water and the additives described above so as to produce a final product preferably containing from 60 to 80% by weight of carbon.

ExempleExample

Des schlamms de lavoirs à charbon obtenus à partir d'un charbon de Freyming (flambant gras) sont soumis à un traitement de flottation en présence de 400 grammes par tonne d'un mélange à 25% demé- thylisobutylcarbinol et 75% de fuel léger. Ledit traitement de flottation est suivi d'une filtration ou d'une centrifugation et d'un tamisage; on obtient ainsi un charbon à 15% d'eau et 6% de cendres (exprimées en poids par rapport au charbon sec).Coal washing schlamms obtained from Freyming charcoal (flaming fatty) are subjected to a flotation treatment in the presence of 400 grams per tonne of a mixture containing 25% methylisobutylcarbinol and 75% light fuel oil. Said flotation treatment is followed by filtration or centrifugation and sieving; a carbon is thus obtained at 15% water and 6% ash (expressed by weight relative to dry coal).

Ce charbon est soumis à un broyage humide de manière à obtenir un produit dont 80% en poids des grains aient une dimension inférieure à 80 microns. On ajoute au cours du broyage:

  • - 0,1% en poids de méthylène bis-naphtalènesul- fonate de sodium
  • - 0,1 % en poids de métasilicate de sodium
  • - 0,03% en poids de méthylcellulose
  • - de l'eau en quantité suffisante pour obtenir un mélange à 60% de charbon, en poids.
This coal is subjected to wet grinding so as to obtain a product of which 80% by weight of the grains have a dimension of less than 80 microns. During grinding, the following are added:
  • - 0.1% by weight of methylene bis-naphthalenesulfonate
  • - 0.1% by weight of sodium metasilicate
  • - 0.03% by weight of methylcellulose
  • - water in sufficient quantity to obtain a mixture of 60% carbon, by weight.

La suspension obtenue a une viscosité au repos qui lui confère une grande stabilité au stockage. Le rhéo- gramme du produit montre qu'il se cisaille aux environs de 2 S-1 et que la viscosité, après cisaillement pendant 2 minutes à 100 S-1, est de 670 mPa.s (centipoises).The suspension obtained has a viscosity at rest which gives it great stability on storage. The rheogram of the product shows that it shears around 2 S - 1 and that the viscosity, after shearing for 2 minutes at 100 S - 1 , is 670 mPa.s (centipoises).

Ce produit à été brûlé dans une chaudière expérimentale d'une puissance de 1 mégawatt thermique munie d'un brûleur tel que décrit dans FR-A-2 054 741 avec un excès d'air de 20%. Le rendement thermique de combustion est de 80,3% contre 89,2% pour une combustion de charbon pulvérisé sec brûlant dans les mêmes conditions, soit un écart de 8,9% seulement.This product was burned in an experimental boiler with a power of 1 megawatt thermal equipped with a burner as described in FR-A-2 054 741 with an excess of air of 20%. The thermal combustion efficiency is 80.3% against 89.2% for combustion of dry pulverized coal burning under the same conditions, a difference of only 8.9%.

Pour montrer l'intérêt de la combinaison entre l'agent tensio-actif et le dispersant, on a mesuré la viscosité, après cisaillement pendant 2 minutes à 100 S-1, d'un mélange à 60% en poids de charbon contenant:

  • - soit 0,1 % en poids de méthylène bis-naphtalène- sulfonate de sodium
  • - soit 0,2% en poids de métasilicate de sodium
  • - soit 0,1 % en poids de méthylène bis-naphtalène- sulfonate de sodium, et 0, % en poids de métasilicate de sodium.
To show the advantage of the combination between the surfactant and the dispersant, the viscosity, after shearing for 2 minutes at 100 S - 1 , of a mixture at 60% by weight of carbon containing the following was measured:
  • - or 0.1% by weight of methylene bis-naphthalene-sodium sulfonate
  • - or 0.2% by weight of sodium metasilicate
  • - Or 0.1% by weight of methylene bis-naphthalene-sodium sulfonate, and 0,% by weight of sodium metasilicate.

Les viscosités mesurées ont été, dans le premier cas de 652 mPa.s (centipoises), dans le second cas de 670 mPa.s (centipoises), dans le troisième de 380 mPa.s (centipoises)..On constate par conséquent un effet de synergie de la combinaison de 2 additifs sur la viscosité des mélanges.The viscosities measured were, in the first case of 652 mPa.s (centipoise), in the second case of 670 mPa.s (centipoise), in the third case of 380 mPa.s (centipoise). One notes consequently a synergistic effect of the combination of 2 additives on the viscosity of the mixtures.

Claims (13)

1. Aqueous suspensions containing at least 60 weight % of at least one solid combustible, characterized in that they contain:
- from 0.01 to 1 weight % of at least one surfactant agent,
- from 0.01 to 1 weight % of at least one dispersant selected among the alkaline metal silicates, the alkaline metal polyphosphates and the alkaline salts of organic polyacids, and
- from 0.01 to 0.1 weight % of at least one gelling agent.
2. Aqueous suspensions according to claim 1, further characterized in that the particle size of the solid combustible is such that 80 weight % of the grains are of a dimension lower than 80 micrometers.
3. Aqueous suspensions according to one of claims 1 and 2, characterized in that the surfactant agent is selected among the anionic surfactants.
4. Aqueous suspensions according to claim 3, characterized in that the anionic surfactant agent is an alkaline metal alkylarylsulfonate.
5. Aqueous suspensions according to one of claims 1 to 4, characterized in that the alkaline metal silicate used as dispersant is sodium metasilicate.
6. Aqueous suspensions according to one of claims 1 to 5, characterized in that the gelling agent is a cellulosic ether.
7. A process for preparation of aqueous suspensions according to one of claims 1 to 6, characterized by grinding the solid combustible in humid medium, and adding to the mixture of solid combustible and water, before, during or after grinding:
- from 0.01 to 1 weight % of at least one surfactant agent,
- from 0.01 to 1 weight % of at least one dispersant selected among the alkaline metal silicates, the alkaline metal polyphosphates and the alkaline salts of organic polyacids,
- from 0.01 to 0.1 weight % of at least one gelling agent, and
- water in sufficient quantity so that the obtained suspension contains at least 60 weight % of solid combustible.
8. A process according to claim 7, characterized by grinding the solid combustible until 80 weight % of the particles will have a dimension lower than 80 micrometers.
9. A process according to one of claims 7 and 8, characterized by adding water in such quantity that the suspension obtained contains from 60 to 80 weight % of solid combustible.
10. A process according to one of claims 7 to 9, characterized by grinding the solid combustible in the presence of an additive to facilitate comminution of the solid combustible.
11. A process according to one of claims 7 to 10, characterized in that the solid combustible is contained in coal washer slurries.
12. A process according to claim 11, characterized in that the slurries, prior to the grinding, are purified until their non combustible residue concentration is lower than 10%.
13. A process according to claim 12, characterized in that the purification is achieved by floata- tion.
EP83400145A 1982-01-29 1983-01-21 Aqueous suspensions containing at least one solid combustible, and process for their preparation Expired EP0086129B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8201421A FR2520750B1 (en) 1982-01-29 1982-01-29 AQUEOUS SUSPENSIONS OF AT LEAST ONE SOLID FUEL AND A PROCESS FOR THEIR PREPARATION
FR8201421 1982-01-29

Publications (2)

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EP0086129A1 EP0086129A1 (en) 1983-08-17
EP0086129B1 true EP0086129B1 (en) 1986-03-12

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EP83400145A Expired EP0086129B1 (en) 1982-01-29 1983-01-21 Aqueous suspensions containing at least one solid combustible, and process for their preparation

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EP (1) EP0086129B1 (en)
JP (1) JPS58134189A (en)
CA (1) CA1189702A (en)
DE (1) DE3362486D1 (en)
ES (1) ES519360A0 (en)
FR (1) FR2520750B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61225287A (en) * 1985-03-29 1986-10-07 Tsuneo Masuda Carbide-water slurry, process and apparatus for production thereof
AU612127B2 (en) * 1986-12-26 1991-07-04 Ube Industries, Ltd. Solid fuel-water slurry composition and process for the preparation of the same
DE3927567C2 (en) * 1989-08-21 1998-07-02 Aqualon Co Use of hydrophobically modified cellulose ethers in aqueous coal slurries and the stabilized coal slurries thus obtained
JPH04130805U (en) * 1991-05-24 1992-12-01 株式会社日立工機原町 Saw wheel drive belt tensioning device for band saw machine
CN105251464B (en) * 2015-11-23 2017-07-04 河南华天环保科技有限公司 A kind of efficient dedusting modifying agent for catching Adsorption flue dust

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065259A2 (en) * 1981-05-15 1982-11-24 Pennsylvania Glass Sand Corporation Process for the preparation of a combustible mixture of coal in water

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE430399C (en) * 1926-06-15 Johannes Bernardus Nachenius Process and device for the production of a high-quality fuel from deposited coal sludge and fine coal
CA1010931A (en) * 1973-07-05 1977-05-24 George A. Pouska Pipelining of dried coal-water slurries
US4045092A (en) * 1975-09-22 1977-08-30 The Keller Corporation Fuel composition and method of manufacture
US4104035A (en) * 1975-12-11 1978-08-01 Texaco Inc. Preparation of solid fuel-water slurries
GB1522575A (en) * 1976-06-24 1978-08-23 Texaco Development Corp Production of solid fuel-water slurries
AT370763B (en) * 1977-05-31 1983-05-10 Scaniainventor Ab CARBON SUSPENSION CONTAINING POWDERED COAL, WATER AND DISPERSING AGENTS, AND METHOD FOR THE PRODUCTION THEREOF

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065259A2 (en) * 1981-05-15 1982-11-24 Pennsylvania Glass Sand Corporation Process for the preparation of a combustible mixture of coal in water

Also Published As

Publication number Publication date
FR2520750A1 (en) 1983-08-05
DE3362486D1 (en) 1986-04-17
ES8405060A1 (en) 1984-05-16
ES519360A0 (en) 1984-05-16
CA1189702A (en) 1985-07-02
JPS58134189A (en) 1983-08-10
EP0086129A1 (en) 1983-08-17
FR2520750B1 (en) 1986-06-06

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