Preparation method of aluminum calcium carbonate composite cementing material and product thereof

A composite cementing material and carbonate technology, which is applied in the field of preparation of aluminum-calcium carbonate composite cementing material, to achieve the effect of reducing heavy metal precipitation and alkalinity

Active Publication Date: 2018-11-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this type of geopolymer material partially reduces the use of high-carbon emission materials such as cement through alkali excitation, it still needs hydration and curing of cementitious materials, and there is no composite glue prepared from red mud in other published patent documents. Coagulation materials applied to CO 2 Mineralization Enhancement Technology

Method used

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  • Preparation method of aluminum calcium carbonate composite cementing material and product thereof
  • Preparation method of aluminum calcium carbonate composite cementing material and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) After ball milling, the Bayer process red mud with an average particle size of 60 microns and limestone (calcium-silica blending mineral) are mixed in a mass ratio of 1:0.14 (the molar ratio of calcium to silicon in the mixture is 1.26-1.28:1) The mixture is calcined at a high temperature of 800 degrees Celsius for 4 hours, cooled, washed with water, and dried as thermally activated red mud.

[0051] (2) The thermally activated red mud has a magnetic field strength of 160kA·m -1 Under the conditions of magnetic separation, the iron recovery rate is 78.1%, and the remaining sodium oxide content (alkali content) is 0.41%.

[0052] (3) The thermally activated red mud, cement (PO42.5) and fly ash (average particle size less than 15 microns) after magnetic separation are uniformly dry mixed according to 70:20:10, and 40% of the total solid mass is added to the water to fully mix. Injection molding, leave the mold naturally for 8 hours, continue to stand for 40 hours, control ...

Embodiment 2

[0054] (1) After ball milling, the Bayer process red mud with an average particle size of 20 microns is mixed with limestone in a mass ratio of 1:0.14 (the molar ratio of calcium to silicon in the mixture is 1.26-1.28:1), and the mixture is at 800 degrees Celsius Calcined at high temperature for 4 hours, cooled, washed with water, and dried as thermally activated red mud.

[0055] The raw material Bayer process red mud and the Bayer process red mud after being calcined at a high temperature at 800 degrees Celsius for 4 hours and cooled by XRD characterization, the ore phase map is as follows figure 1 As shown, the crystalline minerals of Cancrinite, Katoite (garnet) and iron oxide in the raw materials of Bayer process red mud are thermally activated at 800 degrees Celsius with a suitable calcium-silica molar ratio. Except for a small amount of cancrinite, remains. Among other minerals, the calcium and silicon components are mainly converted into calcium silicate (CaSiO 3 ) And a ...

Embodiment 3

[0059] (1) Mixed red mud with an average particle size of 20 microns after ball milling (Bayer process red mud and sintering process red mud are 60% and 40% respectively) and limestone are mixed in a mass ratio of 1:0.08 (calcium in the mixture and The molar ratio of silicon is 1.34-1.36:1), the mixture is calcined at a high temperature of 800 degrees Celsius for 4 hours, cooled, washed with water, and dried as thermally activated red mud.

[0060] (2) The thermally activated red mud has a magnetic field strength of 160kA·m -1 Under the conditions of magnetic separation, the iron recovery rate is 79.7%, and the remaining sodium oxide content is 0.27%.

[0061] (3) The thermally activated red mud, cement (PO42.5) and fly ash (average particle size less than 15 microns) after magnetic separation are uniformly dry mixed according to 70:25:5, and 40% of the total solid mass is added to the water to fully mix. Injection molding, leave the mold naturally for 8 hours, continue to stand fo...

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Abstract

The invention relates to a preparation method of an aluminum calcium carbonate composite cementing material and a product thereof. The preparation method comprises following steps: (1) adjusting the calcium and silicon contents of red mud, and carrying out heat activation, cooling, water washing, and drying to obtain thermally activated red mud; and (2) mixing thermally activated red mud, cement,and an auxiliary cementing material, adding water, curing molding, and then performing CO2 mineralization enhancement to obtain the aluminum calcium carbonate composite cementing material. The methodhas the advantages that red mud can adapt to the technical characteristics of CO2 mineralization enhancement; low value red mud with a high alkali content is utilized, and the low carbon benefits of building materials are maximized.

Description

Technical field [0001] The invention belongs to the field of preparation of composite gelling materials, and specifically relates to a preparation method and product of an aluminum calcium carbonate composite gelling material. Background technique [0002] Vigorously develop CO 2 Greenhouse gas capture and utilization technology (CCUS) is the key to solving the problem of global warming. CO 2 The technology of mineralized enhanced building materials products is the use of CO 2 The mineralization process replaces the traditional hydration and steaming new type of CO 2 Utilization and building materials maintenance technology. The current cement production industry is CO in industrial production 2 One of the main sources of emissions, 0.7-1.1 tons of CO is required to produce 1 ton of traditional Portland cement clinker 2 . In recent years, my country’s cement and concrete output has ranked first in the world, and it faces severe CO under the overall development requirements of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B40/02
CPCC04B28/04C04B40/0236C04B2201/50C04B18/0409C04B14/28C04B14/30C04B14/06C04B18/08C04B18/14C04B18/141C04B18/0481
Inventor 王涛黄浩方梦祥岑建孟王勤辉施正伦高翔骆仲泱倪明江
Owner ZHEJIANG UNIV
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