Classifications

• • 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
  • C10L9/00—Treating solid fuels to improve their combustion
• • 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
  • C10L5/00—Solid fuels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
  • B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
  • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
  • C10B57/10—Drying
• • 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
  • F26B5/16—Drying solid materials or objects by processes not involving the application of heat by contact with sorbent bodies, e.g. absorbent mould; by admixture with sorbent materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
  • F26B2200/08—Granular materials
• • 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
  • F26B5/08—Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment

Definitions

• coal fines also called coal fines
• Such particles typically can have with diameters from approximately 100 to 800 microns in diameter, although coal fines may have smaller diameters, e.g., on the order of 50 microns or less.
• Traditional methods of drying the coal particles including centrifugation and heating technologies, can readily dry these coal "fines" to approximately 30% moisture. Methods of drying coal fines beyond this point typically employ blowers and heaters which require capital intensive investment, require substantial energy use, and create environmental problems and hazards both from energy use and from aerosolization of the coal fines.
• Embodiments of this disclosure provide methods and compositions for drying wet coal fines by employing water-collecting materials such as molecular sieves, water adsorbing polymeric agents, desiccants, and the like that are easily separated from the coal fines, for example by sieving or sifting.
• water-collecting materials such as molecular sieves, water adsorbing polymeric agents, desiccants, and the like that are easily separated from the coal fines, for example by sieving or sifting.
• Such materials may remove all or a portion of the water from the wet fines by physical and/or chemical action.
• the water-collecting materials may draw water from the wet fines by sorption, e.g., absorption or adsorption.
• the materials used for collecting water from the coal fines can be recycled and/or reused to dry more coal fines after removing some or all of the water from the water-collecting materials.
• Figure 1 shows the weight of a batch of molecular sieves used to adsorb water from six batches of coal fines. The weight of the molecular sieves are determined after drying each batch of coal fines and at the indicated time throughout the drying process weighed periodically
• Embodiments described herein utilize water-collecting materials such as adsorbents and absorbents that can collect moisture from wet coal fines.
• such materials can efficiently collect the moisture from the coal fines, and then can be separated from the fines, so as to reduce the amount of water associated with the coal fines.
• the water-collecting materials then can be dried separately from the coal fines.
• the process may provide one or more desirable benefits such as a reduction in one or more of time, energy, cost, and/or adverse environmental impact, as compared to other processes of drying wet coal fines.
• embodiments of this disclosure can substantially reduce the aerosolization of coal fines by blowers, which can pose health, fire and explosion hazards.
• Embodiments described herein do not require the drying and reuse of such water-collecting materials, many such materials can be efficiently dried separately from the coal fines and reused one or more times.
• Embodiments described herein thus employ the drying and reuse water-collecting materials such as absorbents and adsorbents.
• all or a portion of the water-collecting material can be discarded, e.g., where an absorbent is degraded and cannot be effectively separated from the coal fines.
• particles of water-collecting materials are separated by sieving or sifting to remove degraded particles which may be larger than particles of coal fine, but are smaller than desirable for processing wet coal fines.
• some or all of the absorbent materials employed for use in removing moisture from coal fines may be biodegradable.
• the water-collecting material also may bond with the water to cause the water to be associated with the material instead of the coal fines.
• Coal fines may separated from the bulk water (water in excess of that which is associated with coal fines when they settle, or are filtered or centrifuged out aqueous suspension) used in the mining /recovery process by any one or more of a variety of known techniques.
• Such techniques include, but are not limited to one or more of, filtration (e.g., gravity based filtration, or filtration assisted by centrifugal force, pressure or vacuum), settling, centrifugation and the like, which can used singly or in combination. Further amounts of water may optionally be removed from the coal fines by a second round of such treatments.
• the wet coal fines are then mixed with particles of a water-collecting material or combination of different types of water-collecting materials, e.g., particles of absorbent or adsorbent, to further reduce the amount of water associated with the fines.
• the particles of water-collecting material are large enough to be separated from the coal fines by size (e.g., sifting with an appropriate size screen or mesh).
• the wet coal fines are mixed with one or more types of water- collecting materials including, but not limited to, molecular sieves, particles of hydratable polymers (e.g., polyacrylate or carboxymethyl cellulose/polyester particles), or desiccants (e.g., silicates).
• water-collecting materials including, but not limited to, molecular sieves, particles of hydratable polymers (e.g., polyacrylate or carboxymethyl cellulose/polyester particles), or desiccants (e.g., silicates).
• the rate at which various water-collecting materials adsorb, absorb, or react with water present in coal fines may be affected by temperature.
• Each type of water-collecting material may have different optimum temperatures for the rate at which they will accumulate water from the coal fines.
• heating/warming the molecular sieves with the coal fines, or heating/warming molecular sieves immediately prior to mixing them with coal fines may increase the rate at which water becomes associated with the molecular sieves.
• materials such as alumina particles may accumulate water at suitable rate from coal fines at room temperature (e.g., about 20- 25 °C). Water-collecting materials containing water formerly associated with the coal fines can subsequently be removed from the coal fines a variety of means.
• Molecular sieves are materials containing pores of a precise and uniform size (pore sizes are typically from about 3 to about 10 Angstroms) that are used as an adsorbent for gases and liquids. Without wishing to be bound by any theory, generally molecules small enough to pass through the pores are adsorbed while larger molecules cannot enter the pores. Molecular sieves are different from a common filter in that they operate on a molecular level. For instance, a water molecule may not be small enough to pass through while the smaller molecules in the gas pass through. Because of this, they often function as a desiccant. Some molecular sieves can adsorb water up to 22% of their dry weight.
• Molecular sieves often they consist of aluminosilicate minerals, clays, porous glasses, microporous charcoals, zeolites, active carbons (activated charcoal or activated carbon), or synthetic compounds that have open structures through or into which small molecules, such as nitrogen and water can diffuse.
• the molecular sieves are an aluminosilicate mineral (e.g., andalusite, kyanite, sillimanite, or mullite).
• the molecular sieves comprise about 10%, 20%, 30%, 40%, 50%, 60%, 65%,70%, 75%, 80%, 85%, 90%, 95%, 98%o, 99% or greater (on a weigh basis) of an aluminosilicate mineral.
• the particles of molecular sieves may contain other minerals, such oxides of zirconium or titanium to enhance properties such as strength and wear (e.g., zirconia toughened aluminosilicates or alumina-titanate- mullite composites).
• the molecular sieves are 3 angstrom molecular sieves (e.g., MS3A4825 molecular sieves with 2.5 - 4.5 mm bead size and 14 lb crush strength from Delta Enterprises, Roselle, Illinois) or 4 angstrom molecular sieves (e.g., MS4A4810 molecular sieves with 2.5 - 4.5 mm bead size and 18 lb crush strength from Delta Enterprises, Roselle, Illinois).
• 3 angstrom molecular sieves e.g., MS3A4825 molecular sieves with 2.5 - 4.5 mm bead size and 14 lb crush strength from Delta Enterprises, Roselle, Illinois
• 4 angstrom molecular sieves e.g., MS4A4810 molecular sieves with 2.5 - 4.5 mm bead size and 18 lb crush strength from Delta Enterprises, Roselle, Illinois.
• molecular sieves can be employed alone or in combination to remove water or moisture from coal fines.
• molecular sieves may be selected from aluminosilicate minerals, clays, porous glasses, microporous charcoals, zeolites, active carbons, or synthetic compounds that have open structures through or into which small molecules, such as nitrogen and water can diffuse.
• molecular sieves may be selected from aluminosilicate minerals, clays, porous glasses, or zeolites.
• molecular sieve particles are greater than 1 , 1.25, 1.5, 1.75, 2.0, 2.25 or 2.5 mm in diameter and less than about 5 mm or 10 mm. In other embodiments the molecular sieve particles are greater than about 12, 14, 16, 18, 20, 22, 24 or 26 mm in diameter and less than about 28, 30 or 32 mm in diameter.
• wet coal fines wet coal fines
• the molecular sieves quickly draw the moisture from the coal fines.
• the mixture of sieves and coal fines can be lightly bounced on a fine mesh grid, where the dry coal fines can be separated from the molecular sieves.
• the separated molecular sieves can be a bit dusty and can carry a minute amount of coal fines with them after they have absorbed the water.
• the molecular sieves can be passed to a heater where they can be dried and sufficient moisture is removed to permit their reuse if desired.
• the molecular sieves can be employed in a close-loop system, where they are mixed with the coal fines, and after removing water/ moisture (drying) they are separated from the coal fines and passed through a heater and reused. Minimal agitation is required during dry the sieves.
• Hydratable polymeric materials or compositions comprising one or more hydratable polymers may be employed to reduce the moisture content of coal fines (e.g., polyacrylate or carboxymethyl cellulose/polyester particles/beads).
• coal fines e.g., polyacrylate or carboxymethyl cellulose/polyester particles/beads.
• the hydratable polymeric materials is polyacrylate (e.g., a sodium salt of polyacrylic acid).
• Polyacrylate polymers are the superabsorbents employed in a variety of commercial products such as in baby's diapers, because of their ability to absorb up to 400% of their weight in water.
• Polyacrylates can be purchased as a come a translucent gel or in a snowy white particulate form.
• Suitable amounts of polyacrylic acid polymers (polyacrylates) sufficient to adsorb the desired amounts of water from coal fines can be mixed with the fines, to quickly dry coal.
• the polyacrylate, which swells into particles or "balls,” may be separated from the coal fines on suitable size filters or sieves. The particles or "balls" can either be discarded or recycled by drying using any suitable method (direct heating, heating by exposure to microwave energy, and the like).
• hydrateable polymers including polyacrylate polymers
• properties may be varied depending on the specifics of the process being employed to dry the coal fines.
• the properties are controlled to a large degree by the type and extent of the cross-linking that is employed in the preparation of hydratable polymers.
• the use of more cross-linked polymers which are typically mechanically more stable/rigid, will permit their use in more mechanically vigorous processes and the potential reuse of the particles.
• the hydratable polymer composition employed is a combination of carboxymethylcellulose (CMC) and polyester (e.g., CMC gum available from Texas Terra Ceramic Supply, Mount Vernon, TX).
• CMC carboxymethylcellulose
• polyester e.g., CMC gum available from Texas Terra Ceramic Supply, Mount Vernon, TX.
• Such compositions, or other super adsorbent hydratable polymeric substances can be used to remove water from coal fines in a manner similar to that described above for molecular sieves or polyacrylate polymer compositions.
• desiccants are used as water-collecting materials to dry coal fines.
• desiccation agents may be employed to reduce the moisture content of coal fines including, but not limited to, silica, alumina, and calcium sulfate (Drierite, W.A. Hammond Drierite Col Ltd Xenia, OH) and similar materials.
• Desiccants like the compositions described above can be used to remove water from coal fines in a manner similar to that described above for molecular sieves or polyacrylate polymer compositions.
• the desiccant material is comprised of activated alumina, a material that is effective in absorbing water.
• activated alumina's efficiency as a desiccant is based on the large and highly hydrophilic surface area of activated alumina (on the order of 200 m /g) and water's attraction (binding) to the activated alumina surface.
• Other materials having high-surface areas that are hydrophilic are contemplated, e.g., materials that have hydrophilic surfaces and surface areas greater than 50 m 2 /g, 100 m 2 /g or 150 m 2 /g.
• the desiccant comprises about 10%, 20%, 30%, 40%, 50%, 60%, 65%,70%, 75%, 80%, 85%, 90%, 95%, 98%, 99% or greater (on a weigh basis) of alumina.
• Activated alumina is a very hard, durable ceramic capable of withstanding significant abrasion and wear, however, the wear resistance and mechanical properties of activated alumina may be enhanced by introducing other materials into particles of water-collecting materials that comprise alumina.
• desiccants comprising alumina may contain about 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 80%, or 90% or more of other minerals, such oxides of zirconium or titanium to enhance properties such as strength and wear (e.g., zirconia alumina or zirconia toughened alumina ZTA).
• other minerals such oxides of zirconium or titanium to enhance properties such as strength and wear (e.g., zirconia alumina or zirconia toughened alumina ZTA).
• water-collecting materials may be employed in systems for removing water from wet (or moist) coal fines.
• Such water-collecting materials include those that absorb water, those that adsorbs water, and those that bonds or react with water.
• the water-collecting materials will be in the form of particles that can be of any shape suitable for forming an admixture with the wet (or moist) coal fines and that are capable of being recovered.
• Such particles may be irregular in shape, or have a regular shape. Where particles are not irregular in shape they may be of virtually any shape.
• particles that are generally or substantially spherical, or generally or substantially oblate, or prolate may be employed.
• Suitable particle shapes also include cylindrical or conical particles, in addition to regular polygons such as icosahedral particles, cubic particles and the like. During use and reuse the particles may become abraded altering their shape.
• Particles for use in the methods and systems for removing water (e.g., reducing the moisture content) of from coal fines described herein can be of a variety of sizes.
• the particles have an average size that is at least: 2, 3, 4, 6, 7, 8; 9, 10, 12, 14, 16, 18, 20, 25, or 30 times greater than the average size of the coal fines, which are typically in the range of 100 to 800 microns.
• the difference in size is based upon the difference in the average size of the largest dimension of the particles and coal fines.
• Particles of water-collecting materials may have an average diameter (or largest dimension) that is at least: 1, at least 1.25, at least 1.5, at least 1.75, at least 2.0, at least 2.25, at least 2.5 mm, or at least 4 mm where the average diameter (or largest dimension) is less than about 5 mm, 7.5mm, 10mm or 15 mm.
• the systems may employ particles that have an average diameter (or largest dimension) that is greater than about 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26 mm and less than about 28, 30 or 32 mm.
• particles may have a largest dimension that is at least: 1 , at least 1.25, at least 1.5, at least 1.75, at least 2.0, at least 2.25, at least 2.5 mm, or at least 4 mm, and less than about 5 mm, 7.5 mm, 10mm or 15 mm.
• the methods and systems described herein may employ irregular or non-spherical particles that have a largest dimension that is greater than about one of 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26 mm and less than about one of 28, 30 or 32 mm.
• the water-collecting materials are desiccants, such as activated alumina desiccants, which are manufactured in multiple forms.
• the desiccants particles used for water-collecting materials which may be spherical or substantially spherical, are greater than about 1, 1.25, 1.5, 1.75, 2.0, 2.25 or 2.5 mm in diameter and less than about 5 mm or 10 mm in diameter.
• the desiccant particles have an average diameter or greatest dimension that is greater than about 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26 mm in and less than about 28, 30 or 32 mm.
• the desiccant particles are spheres (or substantially spherical) with diameters (e.g., average diameters) in those size ranges. In other embodiments, the desiccant particles are spheres (or substantially spherical) in sizes up to or about 6mm in diameter. In other embodiments the desiccants are spherical or substantially spherical particles comprised of alumina having a size in a range selected from: about 2mm to about 4 mm, about 4 mm to about 8 mm, about 8 mm to about 16 mm, about 16 mm to about 32 mm, about 5 mm to about 10 mm, about 8 mm to about 20 mm, and about 16 mm to about 26 mm. In still other embodiments, the water collecting materials are spherical or substantially spherical alumina particles having an average diameter of about: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, or 32 mm.
• Water-collecting materials may be separated from coal fines by any suitable technique including filtering, sieving or sifting, or the use of a stream of gas to carry coal fines away from larger and/or heavier particles water-collecting materials.
• the separation of all types of water-collecting materials may also be accomplished using magnetic separation equipment where the water-collecting materials comprise material capable of, or susceptible to, being attracted by a magnet.
• Materials that render water- collecting materials capable of being attracted by a magnet include magnetic material and ferromagnetic material (e.g., iron, steel, or neodymium-iron-boron). Water- collecting materials need only comprise sufficient magnetic materials to permit their separation from coal fines.
• the amount of magnetic material employed permit the separation of water-collecting particles from coal fines will vary depending on, among other things, the strength of the magnet, the size of the particles, and the depth of the bed of coal fines from which the particles are to be collected.
• the amount of magnetic material may be greater than about 10%, 20%, 30%, 40%, 50%, 60%, 65%, 70%, 75%, 80%, 85%, or 90% of the total weight of the water-collecting material on a dry weight basis.
• the magnetic materials will be iron or an iron containing material such as steel.
• the magnetic materials may be arranged in the water-collecting material as a solid core or as dispersed particles or layers within the water-collecting materials. Where dispersed particles employed are employed, they may be spread uniformly throughout the water-collecting material.
• the magnetic material is comprises iron containing particles that are admixed with water-collecting materials such as alumina or mullite prior to forming into pellets that will fired into a ceramic type of material.
• the water-collecting materials may contain layers of materials that render the particles susceptible to attraction by a magnet (e.g. iron or steel). Examples of magnetic alumina particles that may be used as water-collecting materials may be found in US Patent No. 4,438,161 issued to Pollock titled Iron-containing refractory balls for retorting oil shale.
• the present disclosure also includes and provides for systems and methods for removing water from wet coal fines.
• the systems and methods described herein may employ any of the above-described water-collection materials or particles of water collecting materials for removing water from coal fines.
• the water-collecting materials may comprise molecular sieve, a hydratable polymers or desiccants.
• the particles also may include materials that render the particles susceptible to attraction by a magnet to facilitate magnetic separation of the particles from coal fines.
• such systems and methods comprise: a first location in which the wet coal fines are admixed with at least one water- collecting material to form an admixture of wet coal fines and said water-collecting material, and
• the second location is configured to provide size-based separation. In another embodiment, the second location is configured to provide a treatment selected from the group consisting of filtering, sieving or sifting, and the use of a stream of gas to carry coal fines away from larger and/or heavier water-collecting materials.
• the second location may also be configured to provide magnetic separation of water-collecting materials from the coal fines.
• Magnetic separation may be employed alone or in combination with any one or more of filtering, sieving or sifting, and the use of a stream of gas to separate coal fines from particles of water-collecting materials.
• Systems and methods for collecting water from coal fines may further comprise a third location where at least a portion of the water is removed from the water- collecting material.
• the systems may further comprising a transporter for transporting at least a portion of the water-collecting material obtained from the third location back to the first location for admixture with wet coal fines.
• a transporter for transporting at least a portion of the water-collecting material obtained from the third location back to the first location for admixture with wet coal fines.
• such transport systems also may include magnetic transport equipment.
• the amount of water by weight that is associated with the water-collecting material is at least 30%, at least 35%, at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, or at least 90%.
• Coal fines (15 g) with a moisture content of 30%> by weight are mixed with molecular sieves having a pore sizes of 3 angstroms (15 g, product MS3A4825 2.5-4.5 mm bead size from Delta Adsorbents, which is a division of Delta Enterprises, Inc., Roselle, Illinois) for about 60 minutes thereby drying the coal fines to ⁇ 5% moisture by weight.
• the molecular sieves were weighed and dried in a 100° C oven. The coal fines were weighed periodically to determine the length of time necessary to drive off the water absorbed from the coal. The data is plotted in Figure 1 for the first batch of coal.
• the process is repeated using the same molecular sieves with a second through sixth batch of coal fines.
• the graph in Figure 1 shows the weight measurements for the molecular sieves throughout the drying process after drying the first through sixth batches of coal fines.
• Figure 1 demonstrates that the molecular sieves can be effectively reused.
• Coal fines (15 g) with a moisture content of 30% by weight are mixed with a polyacrylate polymer (0.5 g Online Science Mall, Birmingham, Alabama) for about 1 minute thereby drying the coal fines to ⁇ 5% moisture by weight. After separating the coal fines from the polymer gently sifting the mix, the molecular polyacrylate polymer particles are recovered for reuse after drying.
• a polyacrylate polymer 0.5 g Online Science Mall, Birmingham, Alabama
• Coal fines (lOOg) with a moisture content of 21% by weight are mixed with activated alumina beads (6mm diameter, AGM Container Controls, Inc, Arlington, AZ) for about 10 minutes, thereby drying the coal fines to about 7% moisture by weight. After separating the coal fines from the polymer gently sifting the mix, the activated alumina beads are recovered for reuse after drying.
• activated alumina beads (6mm diameter, AGM Container Controls, Inc, Arlington, AZ)

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