WO2022224986A1 - Procédé de réduction du carbone non brûlé et procédé de chauffage utilisant de l'oxyde ferrique - Google Patents

Procédé de réduction du carbone non brûlé et procédé de chauffage utilisant de l'oxyde ferrique Download PDF

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WO2022224986A1
WO2022224986A1 PCT/JP2022/018274 JP2022018274W WO2022224986A1 WO 2022224986 A1 WO2022224986 A1 WO 2022224986A1 JP 2022018274 W JP2022018274 W JP 2022018274W WO 2022224986 A1 WO2022224986 A1 WO 2022224986A1
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ferric oxide
fly ash
heating
heated
fluidized bed
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PCT/JP2022/018274
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English (en)
Japanese (ja)
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巧 出口
昂平 大村
卓哉 関
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株式会社トクヤマ
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Priority claimed from JP2021071929A external-priority patent/JP2022166607A/ja
Priority claimed from JP2022068337A external-priority patent/JP2023158472A/ja
Application filed by 株式会社トクヤマ filed Critical 株式会社トクヤマ
Publication of WO2022224986A1 publication Critical patent/WO2022224986A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C13/00—Apparatus in which combustion takes place in the presence of catalytic material
    • F23C13/08—Apparatus in which combustion takes place in the presence of catalytic material characterised by the catalytic material

Definitions

  • the present invention relates to a method using ferric oxide.
  • the first invention relates to a method for efficiently removing unburned carbon contained in fly ash. More specifically, the present invention relates to a more efficient method for removing unburned carbon in fly ash by conventional combustion.
  • a second aspect of the present invention relates to a heating method using a fluidized bed furnace.
  • fly ash When fly ash is used as a small amount of cement mixed component, cement mixed material, or concrete mixed material (hereinafter collectively referred to as "mixed material"), fly ash containing less unburned carbon is generally preferred.
  • Combustion of unburned carbon is mentioned as a method of reducing unburned carbon contained in fly ash.
  • a method of heating unburned carbon a method of using a rotary kiln (Patent Document 1) and a method of using a cyclone (Patent Document 2). , a method using a fluidized bed (Patent Document 3), and the like.
  • the fluidized bed furnace is widely used as a method for heating various things in addition to heating the unburned carbon. It is used in a wide variety of applications, including the incineration process in thermal power generation and waste disposal, and the foaming process in the production of perlite and shirasu balloons.
  • the fluidized bed furnace has the advantage of consuming less fuel for the heating process than other furnaces such as rotary kilns.
  • other furnaces such as rotary kilns.
  • fly ash type I JIS A 6201.
  • Ferric oxide is used as a combustion catalyst for carbon-containing substances.
  • Patent Document 4 regarding the vegetable combustible material used when lighting a stove such as firewood, by coating the vegetable combustible material with ferric oxide powder in advance, it is easy to ignite and soot is generated. It is stated that it can burn completely without generating , smoke or tar.
  • Patent Document 5 by using a combustion catalyst molded body in which a composition containing ferric oxide powder is molded, it is possible to reduce auxiliary combustion energy such as heavy oil, gas, and kerosene when incinerating garbage including various plastic products. It is stated that it leads to
  • Japanese Patent No. 6038548 Japanese Patent No. 3205770 JP-A-2000-213709 JP 2019-108991 A JP 2020-163313 A
  • the present inventors have diligently studied how to further improve the combustion efficiency of unburned carbon, and have focused on the catalytic action of ferric oxide, and as a result completed the present invention.
  • the present inventors have made earnest studies to further increase the heating efficiency of the fluidized bed furnace, focused on the catalytic action of the ferric oxide-containing substance, and used the ferric oxide-containing substance as a fluidizing medium for the fluidized bed furnace. I came up with the idea of using it, and as a result, completed the present invention.
  • the first present invention is a method for reducing unburned carbon contained in fly ash, wherein the fly ash is heated in an oxygen-containing atmosphere while being in contact with a ferric oxide-containing substance. The above method.
  • the second aspect of the present invention is a method for heating an object to be heated by a fluidized bed furnace for improving the efficiency of the heating process in the fluidized bed furnace, wherein a particulate ferric oxide-containing substance is used as a fluid medium, and carbon is used.
  • the contained fuel is burned to maintain the temperature of the furnace body.
  • unburned carbon in fly ash can be removed more efficiently, and energy costs and CO 2 emissions can be reduced.
  • the cost of removing unburned carbon can be further reduced by using waste as the ferric oxide-containing material. It can also reduce waste and natural resource consumption.
  • the auxiliary combustion energy required to maintain the temperature of the furnace that is, the amount of fuel used , and CO2 emissions can be reduced.
  • the substance containing ferric oxide is used as a fluid medium in the form of particles, the object to be heated is discharged from the furnace after being separated from the substance containing ferric oxide, so a separation operation is unnecessary.
  • the cost of molding can be suppressed.
  • the object to be heated contains carbon, the object to be heated put into the furnace can be burned more efficiently by catalytic action.
  • FIG. 1 is a schematic configuration diagram of a fluidized bed furnace used in the present invention
  • FIG. It is an X-ray crystal diffraction spectrum before and after heat-treating copper slag at 750°C for 12 hours.
  • 2 shows X-ray crystal diffraction spectra before and after heating copper slag using the fluidized bed furnace shown in FIG.
  • the first present invention is a method for reducing unburned carbon contained in fly ash by heating fly ash in an oxygen-containing atmosphere while being in contact with a substance containing ferric oxide.
  • a first aspect of the present invention is a method for producing improved fly ash with reduced unburned carbon, wherein fly ash is heated in an oxygen-containing atmosphere while being in contact with a substance containing ferric oxide.
  • the raw material fly ash to be processed in the present invention refers to general fly ash generated in coal-burning facilities such as coal-fired power plants. In addition to coal, it also includes fly ash generated by co-combustion of fuels other than coal and combustible waste.
  • Fly ash contains unburned carbon, which is considered to be carbon residue, and the content is as high as 15% by mass. A large amount of this unburned carbon causes problems when fly ash is used as an admixture. Specifically, if the unburned carbon content (hereinafter sometimes referred to as LOI) is high, unburned carbon will float on the surface of the mortar or concrete, and there is a high possibility that black spots will occur. In addition, there is the possibility that chemicals such as chemical admixtures will adsorb to the unburned carbon, reducing their effectiveness.
  • LOI unburned carbon content
  • a combustion reaction of unburned carbon in the presence of a ferric oxide-containing substance is used.
  • the substance containing ferric oxide includes pure ferric oxide.
  • any known method of burning unburned carbon in the fly ash can be adopted without limitation.
  • a rotary kiln, a cyclone, a fluidized bed furnace, etc. as described in Patent Documents 1 to 3 can be used.
  • the fluidized bed furnace the fluidized bed furnace described in the second aspect of the present invention described later can be used.
  • the heating temperature of the fly ash may be any temperature at which the contained unburned carbon burns, and is generally 700°C or higher.
  • the upper limit is preferably 1000° C. or lower in order to avoid melting of fly ash.
  • the heating time is greatly affected by the heating temperature, and also depends on other conditions such as the amount of unburned carbon contained in the fly ash, so it cannot be said unconditionally, but generally it is about 5 to 30 minutes. good.
  • the heating time required for complete combustion of unburned carbon is about 30 minutes at 700°C, but about 5 minutes at 900°C.
  • the oxygen required for combustion is sufficient if the atmosphere in the heating device (furnace) is air (oxygen concentration of about 20% by volume), but an atmosphere with a higher oxygen concentration facilitates combustion.
  • a feature of the present invention is that when the fly ash is heated as described above, the ferric oxide-containing substance is brought into contact with the fly ash. Contact with the ferric oxide-containing material causes the unburned carbon to burn faster.
  • the method of contacting the ferric oxide-containing substance is not particularly limited.
  • the cyclone wall surface is treated as a mixture of fly ash and the ferric oxide-containing substance.
  • the fly ash containing unburned carbon can be brought into contact with the ferric oxide-containing substance by coating with or using the ferric oxide-containing substance as the fluidizing medium particles of the fluidized bed furnace.
  • the shape is not particularly limited.
  • the ferric oxide should be in contact with the fly ash, and therefore the ferric oxide should be present on the surface of the material to be used.
  • iron powder having only the surface oxidized to ferric oxide can be used for mixing with fly ash, or the inner wall of the heating device can be coated with ferric oxide as described above. good.
  • ferric oxide-containing substance contains ferric oxide can be determined by whether or not the ferric oxide peak can be detected by X-ray crystal diffraction.
  • the type of such ferric oxide-containing substance is not particularly limited, but ferric oxide is preferably 50% or more, more preferably 80% or more, and 90% or more on a mass basis. More preferred, and most preferred is one consisting essentially of ferric oxide (pure ferric oxide).
  • ferric oxide-containing substance As such a ferric oxide-containing substance, it is generally preferable to use waste containing ferric oxide as a main component from the viewpoint of cost and environmental problems.
  • the substance must be stable against the combustion temperature of unburned carbon, and it is desirable that the main component thereof is stable against heating at about 700°C to 1000°C. Copper slag, blast furnace dust, neutralized slag, etc. can be cited as wastes satisfying the above requirements.
  • the above copper slag and the like are mainly composed of iron oxide, but the oxidation state may not be sufficient. Therefore, it is also preferable to sufficiently increase the ferric oxide content by performing an oxidation treatment before contacting the fly ash.
  • the oxidation treatment method is not particularly limited as long as it is an oxidation method that produces ferric oxide, but a simple method is heating at about 600 to 900°C in an oxygen-containing atmosphere such as air.
  • a simple method is heating at about 600 to 900°C in an oxygen-containing atmosphere such as air.
  • the fly ash heat-treated as described above has a reduced content of unburned carbon.
  • the ferric oxide-containing substance is brought into contact with the wall as a coating on the wall surface or as a heating medium for a fluidized bed furnace, as described above, it is possible to obtain fly ash with almost only a reduced amount of unburned carbon, This can be used as it is as an admixture.
  • separation is required before it can be used as a mixed material.
  • centrifugation is generally effective, for example, the use of a cyclone. Separation by a sieve is also effective when the ferric oxide-containing substance is sufficiently large.
  • a second aspect of the present invention is a method for heating an object to be heated by a fluidized bed furnace, in which a particulate ferric oxide-containing substance is used as a fluidizing medium, and a carbon-containing fuel is burned to maintain the temperature of the furnace body. .
  • FIG. 1 is a schematic diagram of a fluidized bed furnace used in the present invention.
  • the fluidized bed furnace shown in FIG. 1 is a bubbling fluidized bed type fluidized bed furnace.
  • the type of the fluidized bed furnace is not limited in the present invention, and the present invention can be applied to various types of known fluidized bed furnaces such as the bubbling fluidized bed type, high-speed fluidized bed type, and circulating fluidized bed type.
  • a particulate ferric oxide-containing substance is used as the fluid medium 2 .
  • a burner 4 is provided in the combustion chamber 3, and the burner 4 is provided with an inlet 31 for the inflow air 21 and an inlet 32 for the fuel (1) 12. Inflowing air 21 heated by combustion of fuel (1) 12 flows into furnace body 1 through burner 4 and distribution disc 5 .
  • the furnace main body 1 is provided with an inlet 33 for the object to be heated 11 and an inlet 34 for the fuel (2) 13 .
  • Furnace body 1 is filled with a fluidizing medium 2 , which is fluidized by heated inflow air 21 that flows into furnace body 1 through dispersion plate 5 .
  • the inflow air 21 is also the source of oxygen required for combustion in the furnace body 1 .
  • the fuel (2) 13 In order to burn the fuel (2) 13, it is necessary to preheat the fuel (2) 13 sufficiently with the heated inflowing air 21 until it ignites. After the fuel (2) 13 starts burning, the temperature of the furnace body is increased and maintained mainly by burning the fuel (2) 13 . At this time, the fuel (1) 12 is used to assist in raising the temperature of the bottom of the furnace body 1 .
  • thermocouple 6 for measuring the temperature of the furnace body is provided at the bottom of the furnace body 1 .
  • the flow rate of the object to be heated 11, fuel (1) 12, and fuel (2) 13 is adjusted as necessary to maintain the furnace body temperature. can be done.
  • the object to be heated and the combustion gas are discharged from the upper part of the furnace body 1 as the discharge 22 .
  • the discharged object to be heated is captured using a bag filter, cyclone, or the like.
  • the furnace body temperature should be at least the temperature at which the fuel and the object to be heated burn, and is generally 500°C or higher, preferably 700°C or higher. On the other hand, the temperature is preferably 1000° C. or less in order to avoid melting of ferric oxide and the like in the particulate matter.
  • fuel (1) 12 In order to keep heating the object to be heated at the heating temperature, that is, to maintain the temperature of the furnace body, fuel (1) 12 must be continuously supplied except when the predetermined furnace body temperature is reached only by combustion and heat generation of the object to be heated. and fuel (2) 13 must continue to be supplied.
  • the flow velocity in the fluidized bed furnace is not particularly limited as long as it is sufficient for fluidization. In a bubbling fluidized bed furnace it is generally between 0.8 m/s and 1.2 m/s.
  • the flow velocity can be derived from the furnace diameter, the temperature inside the furnace, and the flow rate of the inflow air 21 .
  • the fluid medium is a particulate ferric oxide-containing substance (hereinafter simply referred to as a ferric oxide-containing particulate substance).
  • the fluid medium may be particulate matter containing ferric oxide when heating the object to be heated, and may be particulate matter that generates ferric oxide by oxidation treatment and contains ferric oxide.
  • the particulate matter may be used as a fluid medium.
  • Whether or not ferric oxide is contained can be determined by whether or not a ferric oxide peak can be detected by X-ray crystal diffraction.
  • the description in the first invention corresponds to the second invention
  • the description in the second invention corresponds to the first invention, as long as it is not inconsistent.
  • the contained components are not particularly limited. However, it is desirable that the component is stable against heating at about 700°C to 1000°C. In general, components such as silicon oxide and aluminum oxide are stable against heating at about 700° C. to 1000° C., and there is no problem even if they are contained.
  • the method for producing the particulate matter is not particularly limited.
  • Pure iron oxide powder used as a reagent or waste iron oxide powder may be formed into particles, and iron oxide originally obtained in particulate form such as slag is contained.
  • By-products may be used as is.
  • it is a by-product that is originally obtained in the form of particles, and since it does not require prior molding, the cost for molding can be reduced.
  • the type of iron oxide is not particularly limited.
  • the iron oxide may be ferrous oxide, triiron tetroxide, ferric oxide, hydrous iron oxide, or the like, and two or more kinds of iron oxides may be mixed.
  • the particulate matter is preferably particulate waste containing ferric oxide.
  • ferric oxide examples include copper slag, blast furnace dust, and neutralized slag. These are wastes that often consist mainly of iron oxide.
  • the particulate matter formed into particles by molding or the particulate matter originally in particulate form contains ferric oxide as iron oxide
  • the particulate matter can be used as it is as a fluid medium.
  • the iron oxide is other iron oxides than ferric oxide
  • copper slag or the like contains a relatively large amount of iron oxide, but the oxidation state may not be sufficient. Therefore, it is preferable to carry out the oxidation treatment until the inclusion of ferric oxide can be sufficiently confirmed by X-ray crystal diffraction.
  • the method of oxidation treatment of particulate matter containing iron oxide other than ferric oxide is not particularly limited as long as it is an oxidation method that produces ferric oxide.
  • a simple method is heating at about 600 to 900° C. in a containing atmosphere.
  • the fluidized bed furnace may be filled with the fluidized medium.
  • inflowing air is introduced in the fluidized bed furnace and fuel is burned to oxidize the iron oxide to ferric oxide, It may be used as a fluid medium as it is.
  • iron oxides other than ferric oxide are heated.
  • Other particulate matter containing iron oxide may be oxidized.
  • Iron oxides other than ferric oxide are oxidized and dehydrated by being continuously heated in the fluidized bed furnace, and finally become ferric oxide. Since ferric oxide promotes the combustion of carbon by catalytic action, it is possible to sufficiently burn the carbon in the object to be heated and the fuel in the fluidized bed furnace regardless of the type of iron oxide.
  • the amount of fluidized medium used is not particularly limited as long as it does not interfere with use in the fluidized bed furnace. It is preferably 0.6 m to 1 m.
  • the particle size of the particulate matter is not particularly limited as long as it does not interfere with its use as a fluidizing medium in a fluidized bed furnace.
  • a bubbling fluidized bed furnace in general, if the particle size is from 500 ⁇ m to 2000 ⁇ m, the particulate matter flows normally and can be used as a fluidizing medium without any particular problem.
  • the fluid medium can be in contact with the object to be heated, and the thickness is more preferably 500 ⁇ m to 1000 ⁇ m.
  • Copper slag, blast furnace dust and neutralization slag contain many particles of 500 ⁇ m to 1000 ⁇ m, and said particles can be easily obtained by classification. A certain number of particles larger than 1000 ⁇ m are included, but these can be easily crushed into particles of 500 ⁇ m to 1000 ⁇ m.
  • the fuel is a carbon-containing fuel, and is not limited as long as it is a substance that generates heat when burned.
  • the carbon-containing fuel one that does not contain an alkali metal is preferred.
  • Preferred carbon-containing fuels include known fuels such as liquefied petroleum gas (LPG), heavy oil, natural gas, and kerosene.
  • the fuel burns in contact with particulate matter containing ferric oxide. At this time, the fuel is efficiently combusted by the catalytic action of ferric oxide, so heat is easily transferred to the furnace body. Therefore, the amount of fuel required to maintain the furnace body temperature is reduced.
  • the fuel (1) 12 is desired to be a fuel that is easily ignited and combusted in the combustion chamber 3 and that easily transfers heat to the furnace main body 1.
  • LPG is preferred. Even if part of the fuel (1) 12 supplied to the combustion chamber 3 flows into the furnace main body 1 together with the inflow air 21 in an unburned state, it contacts the ferric oxide-containing substance and burns, and burns efficiently. It has the effect of
  • the fuel (2) 13 is desired to be a fuel that has a large amount of carbon content and a large total calorific value, and that can conduct heat to the fluid medium 2 more effectively. Heavy oil is preferred.
  • the object to be heated is not particularly limited in the present invention.
  • Objects for firing such as perlite ore for producing pearlite, shirasu ash for producing shirasu balloons, etc., may also be used for burning unnecessary residual carbon, such as fly ash for reducing or removing unburned carbon. It may be an object intended for removal or an object intended for incineration by burning carbon such as waste. Fly ash, waste, etc., which are intended to burn carbon, are preferred, and can be burned more efficiently by catalytic action with the ferric oxide-containing material, which is the medium particles.
  • Fly ash in the object to be heated of the present invention refers to general fly ash generated in coal-burning facilities such as coal-fired power plants. In addition to coal, it also includes fly ash generated by co-combustion of fuels other than coal and combustible waste.
  • the fly ash contains unburned carbon, which is regarded as carbon residue, and the content is about 15% by mass at most.
  • This high amount of unburned carbon causes problems when fly ash is used as a cement or concrete admixture. Specifically, when the content of unburned carbon is high, there is a high possibility that the unburned carbon will stand out on the surface of the mortar or concrete, resulting in the formation of black areas. In addition, there is the possibility that chemicals such as chemical admixtures will adsorb to the unburned carbon, reducing their effectiveness.
  • fly ash type I JIS A 6201.
  • the temperature of the furnace body is preferably 600° C. or higher in order to burn off unburned carbon in the fly ash.
  • the upper limit is preferably 1000° C. or less in order to avoid melting of particulate matter and fly ash.
  • the temperature is preferably 800° C. or higher and 950° C. or lower.
  • the required temperature cannot normally be maintained by burning unburned carbon in fly ash alone, so the above fuel must be constantly supplied. As for other conditions, the above conditions can be applied.
  • Example 1 All operations in Examples and Comparative Examples were performed in an air atmosphere.
  • the LOI was measured by the ignition loss test method described in ASTM C311. The following experiments were each performed three times, and the median value was used as the LOI measurement value.
  • Comparative Example 1-1 2 g of fly ash having an LOI of 6.27% by mass was placed in a platinum dish, heated in an electric furnace at 750° C. for 1 minute, and allowed to cool, resulting in an LOI of 3.65% by mass.
  • Example 1-1 1 g of the same fly ash as in Comparative Example 1 and 1 g of ferric oxide powder were mixed, heated in an electric furnace at 750° C. for 1 minute in the same manner as in Comparative Example 1-1, and allowed to cool.
  • the LOI of the recovered mixture was 1.66 mass %. Since half of the recovered mass is ferric oxide, the LOI can be considered to be 3.32% by mass when converted on the basis of fly ash.
  • Example 1-2 Comparative Examples 1-1 and 1-2 Heat treatment of fly ash was performed in the same manner as in Example 1, except that the type of metal oxide powder was changed as shown in Table 2.
  • Table 2 shows the LOI values (based on fly ash) after heating.
  • silicon dioxide and aluminum oxide were not confirmed to have the effect of promoting or inhibiting the combustion of fly ash.
  • ferric oxide The most abundant component in copper slag is ferric oxide, followed by silicon dioxide and aluminum oxide. It is presumed that this is due to ferric oxide contained in a large amount.
  • Example 2 Fly ash was heated using a fluidized bed furnace configured as shown in FIG. As fly ash, fly ash having an ignition loss of 6.7% by mass (cumulative volume-based 50% diameter 13 ⁇ m) was used. The ignition loss of the fly ash before and after heating was measured by the ignition loss test method described in JIS A 6201.
  • LPG with a calorific value of 24,000 kcal/m 3 was used as the fuel (1) 12
  • a heavy oil with a calorific value of 9,300 kcal/L was used as the fuel (2) 13 .
  • Example 2-1 Copper slag (which has the chemical composition shown in Table 3 in terms of oxide and the particle size distribution shown in Table 4) was obtained using a fluorescent X-ray analyzer (ZSX Primus II, Rigaku Co., Ltd.). Mitsui Kinzoku Mining Co., Ltd.) was used as the fluid medium.
  • a fluorescent X-ray analyzer ZSX Primus II, Rigaku Co., Ltd.
  • Mitsui Kinzoku Mining Co., Ltd. was used as the fluid medium.
  • the copper slag was subjected to oxidation treatment for about 10 hours under the following conditions before the fly ash was added, and was used so that the presence of ferric oxide in the copper slag could be sufficiently confirmed from the analysis.
  • fly ash is heated to reduce unburned carbon in the fly ash. did.
  • the fuel ( 1) 12 was , fuel (2) 13, and incoming air 21 were adjusted.
  • Comparative Example 2-1 Fly ash was heated in the same manner as in Example 2-1, except that silica sand (Kashima Silica Sand No. 4A) was used as the fluid medium.
  • Evaluation Table 5 shows the fuel consumption required to keep the fluidized bed furnace at 900° C. and the ignition loss of the heated fly ash.
  • Example 2-1 in which the oxidized copper slag containing iron oxide as the main component was used as the medium particles was better than Comparative Example 2-1 in which silica sand was used as the medium particles.
  • the amount of A heavy oil used decreased, and it was confirmed that the total calorific value of the fuel decreased by about 10%.
  • Example 2-1 the ignition loss of the fly ash was further reduced, and the unburned carbon was burned more.

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Abstract

La présente invention concerne également : un procédé de réduction du carbone non brûlé contenu dans des cendres volantes, le procédé impliquant le chauffage de cendres volantes dans une atmosphère contenant de l'oxygène dans l'état dans lequel les cendres volantes sont placées en contact avec une substance contenant de l'oxyde ferrique ; et un procédé de chauffage d'une cible devant être chauffée dans un four à lit fluidisé, un combustible contenant du carbone étant brûlé à l'aide d'une substance contenant de l'oxyde ferrique particulaire en guise de matériau de lit pour maintenir la température du corps du four.
PCT/JP2022/018274 2021-04-21 2022-04-20 Procédé de réduction du carbone non brûlé et procédé de chauffage utilisant de l'oxyde ferrique WO2022224986A1 (fr)

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JP2021-071929 2021-04-21
JP2021071929A JP2022166607A (ja) 2021-04-21 2021-04-21 フライアッシュからの効率的な未燃炭素除去方法
JP2022-068337 2022-04-18
JP2022068337A JP2023158472A (ja) 2022-04-18 2022-04-18 加熱方法

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Citations (7)

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Publication number Priority date Publication date Assignee Title
JPH0719440A (ja) * 1993-06-22 1995-01-20 Chichibu Onoda Cement Corp フライアッシュの処理方法及びその装置
JPH07195053A (ja) * 1993-12-28 1995-08-01 Chichibu Onoda Cement Corp フライアッシュの処理方法及びその装置
JP2005207627A (ja) * 2004-01-20 2005-08-04 Taihei Kogyo Co Ltd フライアッシュ処理装置
JP2006131962A (ja) * 2004-11-08 2006-05-25 Sintokogio Ltd 溶融飛灰に含まれる重金属の分離回収方法
JP2014129210A (ja) * 2012-12-28 2014-07-10 Taiheiyo Material Kk 膨張材
JP2017210378A (ja) * 2016-05-23 2017-11-30 デンカ株式会社 組成物及び不燃材
WO2020189109A1 (fr) * 2019-03-18 2020-09-24 株式会社トクヤマ Procédé de modification de cendres volantes

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* Cited by examiner, † Cited by third party
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JPH0719440A (ja) * 1993-06-22 1995-01-20 Chichibu Onoda Cement Corp フライアッシュの処理方法及びその装置
JPH07195053A (ja) * 1993-12-28 1995-08-01 Chichibu Onoda Cement Corp フライアッシュの処理方法及びその装置
JP2005207627A (ja) * 2004-01-20 2005-08-04 Taihei Kogyo Co Ltd フライアッシュ処理装置
JP2006131962A (ja) * 2004-11-08 2006-05-25 Sintokogio Ltd 溶融飛灰に含まれる重金属の分離回収方法
JP2014129210A (ja) * 2012-12-28 2014-07-10 Taiheiyo Material Kk 膨張材
JP2017210378A (ja) * 2016-05-23 2017-11-30 デンカ株式会社 組成物及び不燃材
WO2020189109A1 (fr) * 2019-03-18 2020-09-24 株式会社トクヤマ Procédé de modification de cendres volantes

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