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Cement-based material expansion agent and preparation method thereof

A technology of cement-based materials and expansion agents, which is applied in the field of building materials to achieve the effects of reducing pollution, improving carbonation resistance, and improving durability

Active Publication Date: 2017-06-16
新疆中丹富兴新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] An object of the present invention is to provide a preparation method of a cement-based material expansion agent, using calcium carbide purified ash as the main raw material, which solves the problem of landfill accumulation of a large amount of solid waste discharged in the production process of calcium carbide, and the expansion agent shows pronounced swelling properties

Method used

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  • Cement-based material expansion agent and preparation method thereof
  • Cement-based material expansion agent and preparation method thereof
  • Cement-based material expansion agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Calcium carbide purified ash 100 parts as raw meal, its composition is: CaO 37.94%, MgO 12.33%, C 34.17%, SiO 2 6.32%, Al 2 o 3 3.37%. Prepare cement-based material expansion agent according to the following steps:

[0037] The raw meal is dried at 105±5°C until the weight loss value is not more than 5 / 10,000, and the dried raw meal is calcined at a high temperature under the following conditions: the calcining temperature is 810°C, the calcining time is 120min, and the holding time is 120min, the heating rate is 5°C / min; after cooling, calcined pellets are obtained (the sum of MgO and CaO content in the calcined pellets is 76.15%, and the ratio of calcium to magnesium is 3.07), and the specific surface area obtained by grinding is 433m 2 / kg cement-based material expansion agent A.

Embodiment 2

[0039] Every 100 parts by mass of raw meal is composed of 80 parts of calcium carbide purified ash and 20 parts of calcium and magnesium regulating components. Among them, the composition of calcium carbide purified ash is: CaO 32.31%, MgO 13.66%, C 27.92%, SiO 2 5.28%, Al 2 o 3 4.11%; calcium and magnesium adjustment components are 10 parts of magnesite tailings and 10 parts of dolomite tailings, the chemical composition of magnesite tailings is MgO 43.66%, CaO 1.71%, SiO 2 1.58%, Al 2 o 3 0.41%, Fe 2 o 3 0.47%, Loss (loss on ignition) 50.47%; chemical composition of dolomite tailings is CaO31.72%, MgO21.28%, SiO 2 0.96%, Fe 2 o 3 2.18%, Loss 42.78%. The magnesite tailings and dolomite tailings ores are crushed and ground to a fineness of 80 μm square hole sieve, and the sieve residue is less than 10%. Prepare cement-based material expansion agent according to the following steps:

[0040] Calcium carbide purified ash and calcium and magnesium adjustment components ...

Embodiment 3

[0042] Every 100 parts by mass of raw meal is composed of 85 parts of calcium carbide purified ash and 15 parts of calcium and magnesium regulating components. Among them, the calcium carbide purified ash is composed of: CaO 37.94%, MgO 12.33%, C 34.17%, SiO 2 6.32%, Al 2 o 3 3.37%; calcium and magnesium adjustment components are 10 parts of magnesite tailings and 5 parts of dolomite tailings, the chemical composition of magnesite tailings is MgO 43.66%, CaO 1.71%, SiO 2 1.58%, Al 2 o 3 0.41%, Fe 2 o 3 0.47%, Loss50.47%; Dolomite tailings chemical composition is CaO 31.72%, MgO 21.28%, SiO 2 0.96%, Fe 2 o 3 2.18%, Loss 42.78%. The magnesite tailings and dolomite tailings ores are crushed and ground to a fineness of 80 μm square hole sieve, and the sieve residue is less than 10%. Prepare cement-based material expansion agent according to the following steps:

[0043] Calcium carbide purified ash and calcium and magnesium adjustment components are evenly mixed to obtai...

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Abstract

The invention provides a cement-based material expansion agent and a preparation method thereof. The preparation method sequence includes the following steps: calcium carbide purified ash and optional calcium and magnesium adjustment components are uniformly mixed to obtain raw meal, and high-temperature calcination is carried out under the following conditions: calcination temperature 800-1200°C, calcination time 60-120min, heat preservation The time is 60-120min, and the heating rate is 5-10°C / min; after cooling, the calcined granular material is obtained, mixed with optional fly ash and / or nano-silica, and finally ground to obtain a cement-based material expansion agent; the calcium The magnesium adjustment component is at least one of minerals containing calcium carbonate, minerals containing magnesium carbonate, CaO and MgO; the sum of the contents of MgO and CaO in the calcined granular material is not less than 70%, and the mass ratio of CaO to MgO is 1.0~3.5. The preparation method of the invention uses calcium carbide purified ash as the main raw material, and the obtained cement-based material expansion agent exhibits obvious expansion performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a cement-based material expansion agent and a preparation method thereof. Background technique [0002] Calcium carbide, chemical name is calcium carbide, molecular formula is CaC 2 , is the basic raw material of the chlor-alkali chemical industry, and polyvinyl chloride (PVC) can be synthesized by using calcium carbide as a raw material. One of ethylene (PS) and acrylonitrile-butadiene-styrene copolymer (ABS), which has the largest output in China. PVC is synthesized from vinyl chloride monomer. As an irreplaceable important raw material for PVC, vinyl chloride monomer is used in industry The acetylene method (calcium carbide method) and the ethylene method are mainly used in the market. Due to the relative scarcity of petroleum resources and the continuous increase in international oil prices, the ethylene method as a petrochemical route is significantly limited. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
Inventor 温勇王芝才陈越平
Owner 新疆中丹富兴新材料技术有限公司
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