CEMENT COMPOSITION AND CEMENT-BASED SOLIDIFYING MATERIAL
PROBLEM TO BE SOLVED: To provide a cement composition and a cement-based solidifying material, each of which has a small ratio of elution amount to a content amount of selenium and consequently suppresses the elution amount of selenium. SOLUTION: The cement composition contains cement clinker contai...
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| creator | ONO AKIE YUGE SACHIO TONOKOUCHI HITOSHI |
| description | PROBLEM TO BE SOLVED: To provide a cement composition and a cement-based solidifying material, each of which has a small ratio of elution amount to a content amount of selenium and consequently suppresses the elution amount of selenium. SOLUTION: The cement composition contains cement clinker containing at most 1.5 mg/kg of selenium and 50-70 mass% of C3S calculated by Bogue's equation, a plaster and a blast furnace slag. The cement-based solidifying material is provided by using the composition. With the cement composition, the cement clinker is the one with reduced selenium, which is produced by air-bleeding a portion of a discharge gas containing selenium from a cement kiln staying between the suspension preheater part of a firing apparatus for cement and the hood entrance of a rotary kiln. COPYRIGHT: (C)2008,JPO&INPIT |
| format | Patent |
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SOLUTION: The cement composition contains cement clinker containing at most 1.5 mg/kg of selenium and 50-70 mass% of C3S calculated by Bogue's equation, a plaster and a blast furnace slag. The cement-based solidifying material is provided by using the composition. With the cement composition, the cement clinker is the one with reduced selenium, which is produced by air-bleeding a portion of a discharge gas containing selenium from a cement kiln staying between the suspension preheater part of a firing apparatus for cement and the hood entrance of a rotary kiln. 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SOLUTION: The cement composition contains cement clinker containing at most 1.5 mg/kg of selenium and 50-70 mass% of C3S calculated by Bogue's equation, a plaster and a blast furnace slag. The cement-based solidifying material is provided by using the composition. With the cement composition, the cement clinker is the one with reduced selenium, which is produced by air-bleeding a portion of a discharge gas containing selenium from a cement kiln staying between the suspension preheater part of a firing apparatus for cement and the hood entrance of a rotary kiln. 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| subjects | ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF NATURAL STONE |
| title | CEMENT COMPOSITION AND CEMENT-BASED SOLIDIFYING MATERIAL |
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