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Granulated blast furnace slag for use as cement starting material and screening method for same

A cement raw material and slag technology, which is applied in cement production, recycling technology, metal recycling, etc., can solve the problems of low strength and slow strength, and achieve low initial strength, low hydration heating rate, and high long-term strength.

Active Publication Date: 2015-12-09
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, blast furnace cement develops strength more slowly than ordinary Portland cement, and its strength is lower than ordinary Portland cement at the initial stage of material age of 3 to 7 days.

Method used

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  • Granulated blast furnace slag for use as cement starting material and screening method for same
  • Granulated blast furnace slag for use as cement starting material and screening method for same
  • Granulated blast furnace slag for use as cement starting material and screening method for same

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Experimental program
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Effect test

Embodiment

[0066] Using the blast furnace water quenching slag fine powder (GGBFS) manufactured in the fine powder manufacturing plant, the effect of the present invention was confirmed according to the following method.

[0067] Collect the blast furnace water quenched slag generated from the blast furnace every time, and conduct quality control according to the chemical composition. The blast furnace water quenched slag of various chemical compositions shown in Table 1 is crushed by the mill of the fine powder manufacturing plant to produce blast furnace water The fine powder of quenched slag was measured, and the activity index of the obtained mortar of fine powder of blast furnace water quenched slag was measured.

[0068] [Table 1]

[0069]

[0070] *1)B M =(CaO+Al 2 O 3 +MgO) / SiO 2 -0.13×TiO 2 -MnO (Among them, CaO, Al 2 O 3 , M g O, SiO 2 , TiO 2 , MnO is the content of each oxide contained in the blast furnace water quenching slag (mass%))

[0071] *2) JIS alkalinity = (CaO+Al 2 O 3 +M g...

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Abstract

Provided are a granulated blast furnace slag suitable as cement starting material for use in high-temperature regions where the annual average temperature is 22°C or above, and a screening method for the same. Granulated blast furnace slag having a chemical composition in which the content (mass%) of CaO, Al2O3, MgO, SiO2, TiO2, and MnO satisfies the following formula (1) is screened, obtaining a granulated blast furnace slag for use as cement starting material in high-temperature regions where the annual average temperature is 22°C or above. 1.17 ≤ BM ≤ 1.35 … (1) In formula 1, BM = (CaO + Al2O3 + MgO) / (SiO2 - 0.13 × TiO2 - MnO (CaO, Al2O3, MgO, SiO2, TiO2, and MnO represent content (mass%) of the oxides included in the granulated blast furnace slag.))

Description

Technical field [0001] The invention relates to a blast furnace water quenching slag (granulated blast furnace lag forcement raw material) for cement raw materials for high-temperature regions with an average annual temperature of 22° C. or more and a screening method thereof. Background technique [0002] Blast furnace water quenching slag is a by-product produced in the process of steel manufacturing, with CaO, Al 2 O 3 , MgO, SiO 2 Main component, widely used as cement raw material. Groundgranulated blast furnace slag powder (groundgranulated blast furnace slag) obtained by pulverizing blast furnace water quenching slag can also be used as a mixture material of ordinary portland cement (ordinary portland cement), especially as a raw material for blast furnace cement (portland blast furnace cement). high. Here, blast furnace cement is a kind of blended cement obtained by mixing ordinary Portland cement and blast furnace water quenching slag fine powder. In Japan, the content o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/02C21B3/04
CPCC21B3/04C04B7/147C04B2111/00215Y02W30/542Y02P40/10Y02W30/50
Inventor 当房博幸渡边圭儿桑山道弘
Owner JFE STEEL CORP
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