Water-quenched blast furnace slag for cement raw material and its screening method

A technology for cement raw materials and screening methods, applied in cement production, recycling technology and other directions, can solve the problems of low strength and slow strength, and achieve the effects of low initial strength, low hydration heating rate, and high long-term strength

Active Publication Date: 2018-05-04
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, blast furnace cement exhibits slower strength than ordinary Portland cement, and has lower strength than ordinary Portland cement at the initial stage of material age of 3 to 7 days.

Method used

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  • Water-quenched blast furnace slag for cement raw material and its screening method
  • Water-quenched blast furnace slag for cement raw material and its screening method
  • Water-quenched blast furnace slag for cement raw material and its screening method

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Effect test

Embodiment

[0066] The effects of the present invention were confirmed by the following method using blast furnace quenched slag fine powder (GGBFS) produced in a fine powder manufacturing plant.

[0067] Blast furnace water-quenched slag produced every time the blast furnace is tapped is collected, quality control is carried out according to the chemical composition, and the blast furnace water-quenched slag with various chemical components shown in Table 1 is pulverized by the grinder of the fine powder manufacturing plant to produce blast furnace water Quenching the slag fine powder, and measuring the activity index of the mortar made of the obtained blast furnace water quenching slag fine powder.

[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 blast furnace water-quenched slag (mass %))

[0071] *2) JIS Alkalinity = (CaO+Al 2 o 3 +M ...

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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 granulated blast furnace slag for cement raw material and its screening method for cement raw materials in high-temperature areas with an annual average temperature of 22°C or higher. Background technique [0002] Blast furnace water-quenched slag is a by-product (by-product) produced in the steel manufacturing process, with CaO, Al 2 o 3 , MgO, SiO 2 It is the main component and is widely used as a cement raw material. The ground granulated blast furnace slag obtained by pulverizing blast furnace water-quenched slag can also be used as a mixture material for ordinary portland cement, especially as a blast furnace cement (portlandblast cement). furnace cement) is in high demand for raw materials. Here, blast furnace cement is a type of blended cement obtained by mixing ordinary Portland cement and blast furnace water-quenched slag fine powder. In Japan, the content of blast furnace water-quenched slag fine powder is general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/02C21B3/04
CPCC04B7/147C04B2111/00215C21B3/04Y02P40/10Y02W30/50
Inventor 当房博幸渡边圭儿桑山道弘
Owner JFE STEEL CORP
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