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Method for preparing active composite materials using materials containing tobermullite phase

A technology of tobermorite and active mixture, which is applied in cement production and other directions, can solve problems such as pollution of the environment, achieve the effects of high utilization rate, solving waste stacking, good hydrolysis ability and reaction ability

Active Publication Date: 2022-03-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Annual equipment maintenance and replacement of pipeline insulation materials produce a large amount of waste tobermorite calcium silicate insulation materials, which seriously pollute the environment and urgently need to be solved

Method used

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  • Method for preparing active composite materials using materials containing tobermullite phase
  • Method for preparing active composite materials using materials containing tobermullite phase
  • Method for preparing active composite materials using materials containing tobermullite phase

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1: The method for activating waste aerated concrete block of the present invention comprises the following steps:

[0048] (1) Break the discarded aerated concrete blocks into aerated concrete fragments, the size of which is 1cm-5cm;

[0049] (2) Configure 20% aqueous solution of anhydrous sodium sulfate.

[0050] (3) The mass ratio of waste aerated concrete to sodium sulfate aqueous solution is 100:15.

[0051] (4) Calcining the aerated concrete fragments, the heating rate is controlled at 5°C / min, calcined at 600°C for 2 hours, and then cooled to room temperature by air cooling or natural cooling;

[0052] (5) Put the above-treated aerated concrete pieces into a ball mill for ball milling, and the fineness is controlled at 200 mesh sieve ≤ 5%.

[0053] According to "GB / T 12957-2005 Test Method for Industrial Waste Residue Activity of Cement Admixtures", the test materials and requirements for the activity of industrial waste residues used in cement admixt...

Embodiment 2

[0057] Embodiment 2: The method for activating waste aerated concrete block of the present invention comprises the following steps:

[0058] (1) Breaking waste aerated concrete blocks into aerated concrete fragments, the size of which is 1cm to 5cm;

[0059] (2) Prepare 20% aqueous solution of anhydrous sodium sulfate, and the mass ratio of waste aerated concrete to sodium sulfate aqueous solution is 100:10.

[0060] (3) Calcining the air-entrained concrete fragments, the heating rate is controlled at 7.5°C / min, calcined at 700°C for 1.5 hours, and then air-cooled or naturally cooled to room temperature;

[0061] (4) Put the aerated concrete fragments after the above treatment into a ball mill for ball milling, and the fineness is controlled at 200 mesh sieve ≤ 5%.

[0062] According to "GB / T 12957-2005 Test Method for Industrial Waste Residue Activity of Cement Admixtures", the test materials and requirements for the activity of industrial waste residues used in cement admix...

Embodiment 3

[0066] Embodiment 3: The method for activating waste aerated concrete block of the present invention comprises the following steps:

[0067] (1) Breaking waste aerated concrete blocks into aerated concrete fragments, the size of which is 1cm to 5cm;

[0068] (2) Prepare 20% aqueous solution of anhydrous sodium sulfate, and mix according to the mass ratio of waste aerated concrete and sodium sulfate aqueous solution is 100:5.

[0069] (3) Calcining the aerated concrete fragments, the heating rate is controlled at 10°C / min, calcined at 825°C for 1 hour, and then air-cooled or naturally cooled to room temperature;

[0070] (4) Put the aerated concrete fragments after the above treatment into a ball mill for ball milling, and the fineness is controlled at 200 mesh sieve ≤ 5%.

[0071] According to the "GB / T 12957-2005 Test Method for Industrial Waste Residue Activity of Cement Admixtures", the test materials and requirements for the activity of industrial waste residues used in c...

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Abstract

The present invention proposes a method for preparing an active mixed material using a material containing tobermullite phase, the material containing tobermullite phase is waste aerated concrete block or waste calcium silicate insulation material, the steps of which are: The steps are: breaking the material containing tobermolite phase into fragments; then mixing and calcining the fragments, and cooling down to room temperature; finally putting the above-treated fragments into a ball mill for ball milling to obtain the pozzolanic active material. The main hydration product tobermolite hydrated calcium silicate in the material after activation treatment is amorphous and has good hydrolysis ability and reaction ability. The activity test of the material after activation treatment shows that its It has pozzolanic activity, and its 28-day compressive strength can reach about 90% of the standard cement mortar test block. The invention solves the problem of resource recycling of waste aerated concrete blocks and calcium silicate insulation materials, and expands its application direction.

Description

technical field [0001] The invention relates to the field of resource utilization of inorganic solid waste, in particular to a method for preparing a pozzolan active mixed material by using waste aerated concrete containing tobermullite phase and tobermullite calcium silicate thermal insulation materials. Background technique [0002] The main mineral phase in the calcium silicate thermal insulation material and the aerated concrete block is tobermolite, and the tobermolite content is greater than 60%. Air-entrained concrete blocks have light weight and good thermal insulation performance. They can be used as wall materials for energy-saving buildings, and have become the leading product in the new building wall market in various places. However, its strength is not high, causing a large number of blocks to be damaged during the production process. Generally, the damage rate of aerated concrete block enterprises in the production process reaches 5% to 8%. It can reach about...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/42C04B7/44
CPCC04B7/246C04B7/425C04B7/44Y02P40/10
Inventor 崔崇崔晓昱
Owner NANJING UNIV OF SCI & TECH
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