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Cement base material expanding 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, simple and easy process, and reducing land occupation

Active Publication Date: 2015-12-09
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 base material expanding agent and preparation method thereof
  • Cement base material expanding agent and preparation method thereof
  • Cement base material expanding agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Calcium carbide purified ash 100 parts as raw material, its composition is: CaO37.94%, MgO12.33%, C34.17%, SiO 2 6.32%, Al 2 o 3 3.37%. Prepare cement-based material expansion agent according to the following steps:

[0036] 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

[0038] 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 adjustment components, wherein the calcium carbide purified ash is composed of: CaO32.31%, MgO13.66%, C27.92%, 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 MgO43.66%, CaO1.71%, SiO 2 1.58%, Al 2 o 3 0.41%, Fe 2 o 3 0.47%, Loss (loss on ignition) 50.47%; the 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:

[0039] Calcium carbide purified ash and calcium and magnesium adjustment components are even...

Embodiment 3

[0041] 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 composition of calcium carbide purified ash is: CaO37.94%, MgO12.33%, C34.17%, 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 MgO43.66%, CaO1.71%, SiO 2 1.58%, Al 2 o 3 0.41%, Fe 2 o 3 0.47%, Loss50.47%; the 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:

[0042] Calcium carbide purified ash and calcium and magnesium adjustment components are evenly mixed to ob...

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Abstract

The invention provides a cement base material expanding agent and a preparation method thereof. The preparation method sequentially comprises the following steps: uniformly mixing calcium carbide purification ash with an optional calcium and magnesium adjusting component to obtain a raw material; carrying out high temperature calcining under the following conditions: the calcining temperature is 800-1200DEG C, the calcining time is 60-120min, the heat insulation time is 60-120min, and the heating rate is 5-10DEG C / min; and cooling to obtain calcining particles, mixing the calcining particles with optional fly ash and / or nano-silica, and grinding to obtain the cement base material expanding agent. The optional calcium and magnesium adjusting component is at least one of calcium carbonate-containing mineral, magnesium carbonate-containing mineral, CaO and MgO; and the sum of the MgO content and the CaO content in the calcining particles is not smaller than 70%, and a mass ratio of CaO to MgO is 1.0-3.5. The preparation method adopts the calcium carbide purification ash as a main raw material, so the cement base material expanding agent obtained in the invention has an 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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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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