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A kind of lightweight ceramsite and its preparation method

A lightweight ceramsite and ceramsite technology, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problems of high ceramsite bulk density, large preparation energy consumption, and low quality, so as to reduce the sintering temperature and improve The effect of porosity

Active Publication Date: 2020-04-10
西安安居未来建设科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects and deficiencies of the prior art, the purpose of the present invention is to provide a light ceramsite and its preparation method, which uses discarded iron tailings or coal gangue and methanol slag as the main raw materials to solve the problem of high bulk density of the existing ceramsite. , low quality and high energy consumption for preparation

Method used

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  • A kind of lightweight ceramsite and its preparation method
  • A kind of lightweight ceramsite and its preparation method

Examples

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preparation example Construction

[0029] The present invention also discloses a preparation method of the above-mentioned ceramsite, specifically comprising:

[0030] Step 1, drying and grinding the iron tailings powder (or coal gangue powder) and methanol slag respectively, and then passing through a 75 μm square hole sieve, and using the part below the 75 μm square hole sieve as the raw material for preparing ceramsite;

[0031] Step 2: Weigh the required raw materials respectively according to the above ratio, put the measured iron tailings powder (or coal gangue powder), methanol slag and alkaline activator into the mixer, first dry stir for 3 minutes to make the raw materials mix evenly , and then add 20% to 30% water and stir for 2 minutes to obtain a mixture; send the mixture into a ball forming plate to form balls;

[0032]Step 3: Put the pellets in an oven, foam and solidify at 95-105°C for 6 hours to form alkali-activated pellets; usually, the sintering strength of the pellets has a good positive cor...

Embodiment 1

[0037] Methanol slag and iron tailings are mechanically crushed and ground, then passed through a 75μm square hole sieve, and the methanol slag and iron tailings fine powder below the 75μm square hole sieve are mixed and dried in a mass ratio of 6:4 , mixed with 9% NaOH, mixed evenly and put into the blender, dry stirred for 3 minutes, then mixed with 25% water and stirred for 2 minutes. Send the stirred mixture into the ball forming tray, extrude into balls, stimulate and solidify the balls in an oven at 105°C for 6 hours, and then bake them under anaerobic conditions at 500°C for 40 minutes, then bake them at 980°C for 30 minutes, and cool to room temperature to form ceramsite.

[0038] The bulk density of the ceramsite prepared in this embodiment is 600kg / m 3 , The cylinder compressive strength is 10.2MPa, and the water absorption rate is 12.9%.

Embodiment 2

[0040] The difference between this example and Example 1 is: methanol slag and iron tailings fine powder are mixed in a mass ratio of 5:5; the anaerobic roasting process is roasting at 500° C. for 35 minutes under anaerobic conditions.

[0041] The bulk density of the ceramsite prepared in this embodiment is 680kg / m 3 , The cylinder compressive strength is 12.1MPa, and the water absorption rate is 7.5%. The morphology of the ceramsite prepared in this example is as follows: figure 1 shown

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Abstract

The invention discloses a light ceramsite and a preparation method thereof. The ceramsite is prepared from a main raw material--solid waste composed of methanol residues and iron tailing powder or coal gangue powder, and an admixture--an alkali activator. The method comprises the following steps: subjecting the iron tailing powder or coal gangue powder, the methanol residues and the alkali activator to mixing and foaming so as to form an alkali-activated pellet; calcining the alkali-activated pellet at 450-550 DEG C for 20-40 min under anaerobic conditions and then carrying out calcining at 950 to 1050 DEG C for 30 min; and performing cooling to obtain the light ceramsite. According to the invention, after the methanol residues undergo alkali activation, a part of a liquid phase with appropriate viscosity is formed on the surface during high-temperature calcining, so the strength of the ceramsite is improved; in addition, slag formed by the anaerobic calcination of a mixture of the methanol residues and the fine iron tailing powder (or fine coal gangue powder) releases a large amount of gas during pyrolysis, so a part of the components of the pellet continue to swell and produce gas after melting in a high temperature state, and thus, the porosity of the ceramsite is improved and lightweight effect is achieved.

Description

technical field [0001] The invention belongs to the field of building energy-saving materials and resource recycling, and in particular relates to a lightweight ceramsite and a preparation method thereof. Background technique [0002] Ceramsite is a kind of artificial lightweight aggregate prepared by sintering process. Ceramsite concrete is a kind of concrete made of ceramsite as coarse aggregate, mixed with fine aggregate such as ordinary sand or ceramsite and cementitious materials, and belongs to lightweight aggregate concrete. It has a high internal porosity and good thermal insulation performance. It can play a good role in thermal insulation and energy saving when used on the inner and outer walls and roofs of buildings. Using the characteristics of low density and light weight of ceramsite concrete to make non-load-bearing components such as partition walls and filling walls can significantly reduce the weight of buildings and effectively alleviate the adverse effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B38/06C04B18/02
CPCC04B18/027C04B35/622C04B35/62204C04B38/068C04B2235/3201C04B2235/5436C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B38/067
Inventor 李晓光秦晋一裴秀卫王攀奇陈传新屈雅安
Owner 西安安居未来建设科技有限公司
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