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公开(公告)号：US20190233331A1
公开(公告)日：2019-08-01
申请号：US16315091
申请日：2017-06-29
Applicant: TOKUYAMA CORPORATION
Inventor： Kohei OMURA , Takuya SEKI
CPC classification number: C04B18/08 , B09B5/00 , B09B2220/06 , C04B7/32 , C04B7/38 , C04B28/02 , Y02W30/92
Abstract: A sieve with a mesh opening of 75 to 20 μm is provided. A raw fly ash powder is separated into a component remaining on the sieve and a component passing through the sieve by classification using the sieve. A fine fly ash powder, which is the component passing through the sieve, is used as a cement admixture. A coarse fly ash powder, which is the component remaining on the sieve, is used for production of cement clinker.
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公开(公告)号：US20210017076A1
公开(公告)日：2021-01-21
申请号：US16978578
申请日：2019-03-05
Applicant: TOKUYAMA CORPORATION
Inventor： Kohei OMURA , Kenichi KAKIZONO , Takuya SEKI , Takeshi KAWANO
Abstract: A process for reforming the fly ash, including the heating step that heats a raw fly ash powder containing the unburned carbon at a temperature of 780 to 1000° C. to decrease the amount of the unburned carbon contained in the raw fly ash powder; the classifying step that introduces the heat-treated fly ash containing the unburned carbon in decreased amounts obtained through the heating step into a classifying apparatus in the state of being heated at a high temperature so as to separate the fly ash into a coarse powder and a fine powder; the fine powder recovering step that recovers the fine powder of the heat-treated fly ash obtained through the classifying step by using a dust-collecting apparatus; and the milling step that mills the coarse powder of the heat-treated fly ash obtained through the classifying step until a 45 μm sieve residue becomes not more than 34% by mass, and then recovers the milled powder.
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公开(公告)号：US20210238089A1
公开(公告)日：2021-08-05
申请号：US16972139
申请日：2020-02-13
Applicant: TOKUYAMA CORPORATION
Inventor： Kohei OMURA , Takuya SEKI
Abstract: A process for reforming the fly ash by heating a raw fly ash powder that contains the unburned carbon and thereby decreasing the content of the unburned carbon, characterized in that (a) as means for heating the raw fly ash powder, use is made of a heating unit that heats the raw fly ash powder by passing it through a heated medium-fluidized bed, (b) a high-temperature gas stream is passed through the heating unit to form the heated medium-fluidized bed and to fluidize and convey the raw fly ash powder that is thrown into the medium-fluidized bed, (c) the flow rate of the high-temperature gas stream is so set that the raw fly ash powder thrown into the heating unit is all heated in the medium-fluidized bed and is taken out from a take-out port provided at an upper part of the heating unit but that the particulate medium forming the medium-fluidized bed is not discharged from the take-out port, (d) the fly ash powder after heated and discharged from the take-out port of the heating unit is introduced into an air classifier where it is separated into a fine powder and a coarse powder, (e) the fine powder separated by the air classifier is recovered as the reformed fly ash, and (f) the coarse powder separated by the air classifier is measured for its content of the unburned carbon and when the measured value is larger than a predetermined threshold value, the coarse powder is introduced again into the heating unit so as to be heated again and when the measured value is smaller than the threshold value, the powder is recovered as the reformed fly ash.
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Patent Agency Ranking
公开(公告)号：US20210032163A1
公开(公告)日：2021-02-04
申请号：US16978623
申请日：2019-03-11
Applicant: TOKUYAMA CORPORATION
Inventor： Kenichi KAKIZONO , Kohei OMURA , Takuya SEKI , Takeshi KAWANO
Abstract: A process for reforming the fly ash, including the heating step that heats a raw fly ash powder containing the unburned carbon at a temperature of 780 to 1000° C. to decrease the amount of the unburned carbon contained in the raw fly ash powder; and the cooling/classifying step that introduces the heat-treated fly ash in a state of being maintained at a high temperature as obtained through the heating step into a cooling/classifying apparatus so that the fly ash is separated into a fine grains and a coarse grains; wherein the cooling/classifying apparatus 3 used in the cooling/classifying step has a basic structure in which the gas flow for classification is introduced from the lower side and the gas flow Z for cooling/classification introduced into the apparatus is then discharged from the upper side; the heat-treated fly ash is brought into contact with the gas flow Z for cooling/classification, the fine grains contained in the heat-treated fly ash is lifted up and discharged out of the apparatus while the coarse grains contained in the heat-treated fly ash is allowed to stay in the apparatus 3, and the fine grains and the coarse grains are separated and cooled; and the fine grains discharged from the apparatus 3 is recovered by using a dust-collecting apparatus, and the coarse grains is recovered from the apparatus 3.
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公开(公告)号：US20200010362A1
公开(公告)日：2020-01-09
申请号：US16494521
申请日：2018-03-19
Applicant: TOKUYAMA CORPORATION
Inventor： Kohei OMURA , Takuya SEKI , Hiroyoshi KATO
Abstract: A process for producing a modified fly ash comprising the steps of providing, as a raw material, the raw fly ash discharged from a pulverized coal combustion boiler; classifying the raw fly ash into a crude powder and a fine powder; removing the unburned carbon contained in the crude powder by heating the crude powder at a temperature in a range of 500 to 1000° C.; and mixing together the crude powder from which the unburned carbon has been removed and the fine powder to obtain a modified fly ash.
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公开(公告)号：US20250019308A1
公开(公告)日：2025-01-16
申请号：US18712959
申请日：2022-11-30
Applicant: TOKUYAMA CORPORATION
Inventor： Takahiro ONISHI , Kohei OMURA , Takumi DEGUCHI
Abstract: A powdery hydraulic composition that includes: a powder raw material A having at least one or more selected from fly ash and slag fine powder, and a powder raw material B having at least one or more selected from alkali silicate powder and alkali carbonate powder, and by mixing with water, hardening is possible even at ordinary temperature, and it is not necessary to use alkali solution comprising sodium hydroxide, etc.
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7.发明公开公开(公告)号：US20240327305A1
公开(公告)日：2024-10-03
申请号：US18613305
申请日：2024-03-22
Applicant: Tokuyama Corporation
Inventor： Kohei OMURA , Takahiro ONISHI
IPC: C04B40/02 , B01D53/62 , C04B7/36 , C04B22/00 , C04B111/00
CPC classification number: C04B40/0231 , B01D53/62 , C04B7/367 , C04B22/004 , B01D2251/404 , B01D2257/504 , B01D2258/0233 , C04B2111/00017
Abstract: A calcium-containing composition with fixed CO2 is produced by contacting a mixture of a calcium-containing composition before CO2 fixation and water with a CO2-containing gas. The calcium-containing composition, liquid water, and the CO2-containing gas having a temperature between 20 degree Celsius and 300 degree Celsius and a CO2 concentration between 1 volume % and 100 volume % are supplied to a reactor. By the supplied CO2-containing gas, the calcium-containing composition and water are made to flow in the reactor. Alternatively, the calcium-containing composition and water are in the reactor. Thus, CO2 is fixed in the calcium-containing composition and simultaneously the calcium-containing composition is dried to a water content of 5 mass % or less.
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公开(公告)号：US20210252568A1
公开(公告)日：2021-08-19
申请号：US17256876
申请日：2019-06-04
Applicant: TOKUYAMA CORPORATION
Inventor： Kohei OMURA , Takuya SEKI
Abstract: A method of recovering the fly ash, including the firing step in which the raw fly ash powder containing the unburned carbon is fired to remove the unburned carbon by burning, characterized by further including the step of measuring the content of unburned carbon in the raw fly ash powder; and the sieve-classifying step of obtaining a fine fly ash powder which is the component under the sieve and has a decreased content of unburned carbon as a result of sieve-classifying the raw fly ash powder; wherein the perforation size of the sieve used in the sieve-classifying step is set depending upon the content of unburned carbon in the raw fly ash powder, the sieve having a small perforation size being used when the content of unburned carbon is large and the sieve having a large perforation size being used when the content of unburned carbon is small; and the fine fly ash powder which is the component under the sieve is recovered through the firing step.
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