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Fly ash ceramsite and preparation method thereof

A technology of fly ash ceramsite and cavity, which is applied in the field of solid waste resource utilization, can solve the problems of high bulk density, high water absorption rate, low water absorption rate, etc. degree of effect

Active Publication Date: 2020-02-25
INST OF PROCESS ENG CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a kind of fly ash ceramsite and its preparation method, which solves the problems of high bulk density and high water absorption of existing fly ash ceramsite, and obtains light weight, high strength, low Fly ash ceramsite with excellent water absorption and comprehensive performance

Method used

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  • Fly ash ceramsite and preparation method thereof
  • Fly ash ceramsite and preparation method thereof
  • Fly ash ceramsite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) adding the coal slime containing humic acid into a granulator to granulate, and obtaining a ball with a diameter of 3 mm to form a nucleating agent;

[0046] (2) Mix 75 parts of fly ash, 14.7 parts of albite, 5 parts of clay, and 0.3 parts of silicon carbide, and use the mixture to coat a nucleating agent (7 parts by mass) obtained in step (1) , and then added to a granulator for granulation to obtain pellets with a diameter less than 20mm;

[0047] (3) Dry the pellets obtained in step (2) at 80°C, then place them in a sintering furnace and heat up to 1180°C for 10 minutes. After the sintering is completed, cool down to below 500°C with the furnace, take it out, and cool it down to room temperature naturally. Get fly ash ceramsite.

[0048] Such as figure 1 As shown, the fly ash ceramsite prepared in this embodiment has a cavity, and the area outside the cavity is distributed with uniform pores.

Embodiment 2

[0050] (1) The coal slime containing humic acid is added into a granulator and granulated to obtain a ball with a diameter of 4.2mm to form a nucleating agent;

[0051] (2) Mix 82 parts of fly ash, 8 parts of albite, 4.5 parts of clay, and 0.5 parts of silicon carbide, and use the mixture to coat a nucleating agent (9 parts by mass) obtained in step (1) , and then added to a granulator for granulation to obtain pellets with a diameter less than 20mm;

[0052] (3) Dry the pellets obtained in step (2) at 100°C, then place them in a sintering furnace and heat up to 1210°C for 20 minutes. After the calcination is completed, cool down to below 500°C with the furnace, take it out, and cool it down to room temperature naturally. Obtain the fly ash ceramsite.

Embodiment 3

[0054] (1) Sodium silicate slag is added into a granulator and granulated to obtain a ball with a diameter of 1.3 mm to form a nucleating agent;

[0055] (2) Mix 85 parts of fly ash, 9.2 parts of albite, and 0.8 parts of silicon carbide, and use the mixture to coat a nucleating agent (5 parts by mass) obtained in step (1), and then add the Granulate in a granulator to obtain pellets with a diameter less than 20mm;

[0056] (3) Dry the pellets obtained in step (2) at 120°C, then place them in a sintering furnace and heat up to 1230°C for 20 minutes. After the sintering is completed, cool down to below 500°C with the furnace, take it out, and cool it down to room temperature naturally. Obtain the fly ash ceramsite.

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Abstract

The present invention relates to fly ash ceramsite and a preparation method thereof, wherein the fly ash ceramsite has a cavity structure, uniform gas pores are distributed in the area outside the cavity, and the inner wall of the cavity is obtained by carrying out high temperature decomposition on low melting point solid waste containing crystal water, structural water or hydroxyl. The preparation method comprises: nucleating by utilizing the raw materials of a nucleating agent to obtain a spherical nucleating agent; mixing fly ash and other auxiliary materials according to a formula ratio; coating the nucleating agent by utilizing the mixture; granulating to obtain pellets; and drying the pellets, roasting, and cooling to obtain the fly ash ceramsite. According to the invention, the prepared fly ash ceramsite has a ceramsite stacking density of 400-600 kg / m<3>, a water absorption rate of 0.5-2.5% and a numerical tube pressure of 3-6 MPa; and with the method, in the case of the ensuring of the strength of ceramsite, the prepared fly ash ceramsite has characteristics of low bulk density, light weight, low water absorption rate and the like, can meet the market requirements on lightweight high-strength fly ash ceramsite, and has good application prospects.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a fly ash ceramsite and a preparation method thereof. Background technique [0002] Ceramsite has excellent properties, such as low density, high cylinder compressive strength, high porosity, high softening coefficient, good frost resistance, excellent anti-alkali aggregate reaction performance, etc., and can be widely used in building materials, gardening, food and beverage, refractory Insulation materials, chemical industry, petroleum and other departments. Fly ash ceramsite is made of fly ash as the main raw material, mixed with a small amount of auxiliary raw materials (binder, flux, combustion enhancer, etc.) An artificial lightweight aggregate. It has the advantages of light weight, corrosion resistance, frost resistance, earthquake resistance and good insulation. It can be widely used in concrete components, refractory cast components and building insul...

Claims

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Application Information

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IPC IPC(8): C04B18/02
CPCC04B18/027C04B14/022C04B18/023C04B18/08C04B14/045C04B14/10C04B14/324C04B18/12
Inventor 王晓辉马淑花南洪钧许敏第穆小占王月娇刘树森侯泽健
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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