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A kind of preparation method of ternary composite inorganic gelling material of current exhaust furnace slag

An inorganic cementitious material and ternary composite technology, applied in cement production, etc., to achieve good volume stability, reduce environmental pressure, and high early strength

Active Publication Date: 2021-06-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During hydration, gypsum is hydrated first, which overcomes the shortcoming of low early strength of pozzolanic materials, and the later slag hydration continues to increase the strength of the system, and fundamentally improves the water resistance. Good volume stability, good water resistance and other properties

Method used

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  • A kind of preparation method of ternary composite inorganic gelling material of current exhaust furnace slag
  • A kind of preparation method of ternary composite inorganic gelling material of current exhaust furnace slag
  • A kind of preparation method of ternary composite inorganic gelling material of current exhaust furnace slag

Examples

Experimental program
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Effect test

Embodiment 1

[0036]A method for preparing a ternary composite inorganic gelling material for existing slag, comprising the following steps:

[0037] 1) Mix and stir the currently discharged slag and limestone fine powder until the temperature of the material drops to 400°C, and record it as powder A, wherein the mass ratio of slag to limestone fine powder is 100:10.

[0038] 2) Add phosphogypsum to powder A, mix and stir until the temperature drops to 40°C, and record it as powder B, where the mass ratio of powder A to phosphogypsum is 100:15.

[0039] 3) The powder B is mechanically ground until the maximum particle size is less than 45 μm to obtain the inorganic gelling material.

[0040] After testing, the 3d compressive strength of the inorganic gelling material prepared in this example is 6 MPa, and the 56d compressive strength is 36 MPa.

Embodiment 2

[0042] A method for preparing a ternary composite inorganic high-performance cementitious material for existing slag, comprising the following steps:

[0043] 1) Mix and stir the currently discharged slag and limestone fine powder until the temperature of the material drops to 400°C, and record it as powder A, wherein the mass ratio of slag to limestone fine powder is 100:25.

[0044] 2) Add phosphogypsum to powder A, mix and stir until the temperature drops to 55°C, and record it as powder B, where the mass ratio of powder A to phosphogypsum is 100:15.

[0045] 3) The powder B is mechanically ground until the maximum particle size is less than 45 μm to obtain the inorganic gelling material.

[0046] After testing, the 3d compressive strength of the inorganic gelling material prepared in this example is 10 MPa, and the 56d compressive strength is 40 MPa.

Embodiment 3

[0048] A method for preparing a ternary composite inorganic high-performance cementitious material for existing slag, comprising the following steps:

[0049] 1) Mix and stir the currently discharged slag and limestone fine powder until the temperature of the material drops to 500°C, and record it as powder A, wherein the mass ratio of slag to limestone fine powder is 100:18.

[0050] 2) Add phosphogypsum to powder A, mix and stir until the temperature drops to 65°C, and record it as powder B, where the mass ratio of powder A to phosphogypsum is 100:35.

[0051] 3) The powder B is mechanically ground until the maximum particle size is less than 45 μm to obtain the inorganic gelling material.

[0052] After testing, the 3d compressive strength of the inorganic gelling material prepared in this example is 12 MPa, and the 56d compressive strength is 45 MPa.

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Abstract

The present invention provides a method for preparing a ternary composite inorganic cementitious material of slag slag, which comprises the following steps: 1) mixing and stirring the slag and fine powder of limestone until the temperature of the material drops to 400° C. to 500° C. is powder A; 2) Add phosphogypsum to powder A, mix and stir until the temperature drops to 40°C to 90°C, denoted as powder B; 3) Mechanically grind powder B until the maximum particle size is less than 45 μm That is, the inorganic gelling material is obtained. The invention cleverly utilizes the heat of the existing slag, uses high-temperature waste heat to calcine limestone, low-temperature waste heat to calcine gypsum, and uses the water after calcination of gypsum to slake lime, and at the same time uses lime to neutralize acidic components in phosphogypsum, and finally grinds them to homogenize them. Chemical and modified composite cementitious materials. The ternary components in the cementitious material stimulate each other's activities, and have the advantages of high early strength, stable later strength development, good volume stability, good water resistance, etc., and can be used for the production of mass concrete and the like.

Description

technical field [0001] The invention relates to a method for preparing a ternary composite inorganic gelling material of existing slag, and belongs to the field of preparation methods of the gelling material in the construction industry. Background technique [0002] Slag is the solid residue of molten matter produced in the process of smelting metal, coal burning, garbage incineration, etc. Its composition is based on oxides (SiO 2 , Al 2 o 3 , CaO, MgO, etc.), often entrained with a small amount of heavy metals and other impurities. In 2015, my country's annual crude steel output was 804 million tons, and the amount of solid waste in the iron and steel industry generated during the production process was about 1 billion tons, covering an area of ​​about 6.67×10 7 m 2 , and continues to discharge about 150 million tons of solid waste every year. In 2013, my country's coal demand was 3.61 billion tons, of which nearly 2 billion tons were used in thermal power plants. If...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/21C04B7/36C04B11/30C04B11/26
CPCC04B7/21C04B7/36C04B11/26C04B11/30Y02P40/10
Inventor 高建明陈雪梅贺知章
Owner SOUTHEAST UNIV
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