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Solid-waste-based high-strength unfired fly ash ceramsite and preparation method thereof

A fly ash ceramsite, high-strength technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of low strength of ceramsite and increase in cost, and achieve the effect of promoting adsorption performance, saving time and cost, and slowing consumption.

Pending Publication Date: 2021-12-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention is in order to solve the relatively low strength of the ceramsite prepared by separate fly ash. At present, it is necessary to add more than 30% cement and silica fume to increase the strength of the fly ash ceramsite so that the intensity of the fly ash ceramsite reaches about 6Mpa, so that To solve problems such as cost increase, a solid waste-based high-strength unburned fly ash ceramsite and its preparation method are provided. The prepared fly ash ceramsite has a strength of 10-14Mpa

Method used

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  • Solid-waste-based high-strength unfired fly ash ceramsite and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0040] Example 1: Mix fly ash, attapulgite, cement, silica fume, and diatomaceous earth according to the mass ratio of 70:10:10:5:5, and put them into a granulator for further mixing after preliminary mixing Uniform; after mixing evenly, slowly add 10% of the mass of the solid mixture of sodium hydroxide solution with a concentration of 8mol / L; then slowly add 0.5% of the mass of the solid mixture of hydrogen peroxide solution with a mass fraction of 30%, and stir for 2 minutes After being mixed evenly, slowly add the water glass with a modulus of 3.2 of 5% of the quality of the solid mixture, and stir for 1 minute; , until the end of the final granulation process. After the finished fly ash ceramsite is naturally cured for 6-12 hours, it is put into an autoclave for 12 hours. The steaming condition of the autoclave is: the steaming temperature is 170°C, the pressure is 8 atmospheres,

[0041] The prepared fly ash ceramsite, ceramsite performance testing fully complies with ...

example 2

[0043] Example 2: Slowly add 1.5% of the mass of the solid mixture into a 30% hydrogen peroxide solution, and stir for 2 minutes; after mixing evenly, slowly add 5% of the mass of the solid mixture into water glass with a modulus of 3.1, and stir for 1 Minutes; after mixing evenly, continue to slowly add 8mol / L sodium hydroxide solution with 12% solid mixture mass until the final granulation process ends. Put into the autoclave and steam for 8 hours. The steaming condition of the autoclave is: steaming temperature 180 ℃, pressure is 9 atmospheres, other methods are the same as example 1.

[0044] The prepared fly ash ceramsite, ceramsite performance testing fully complies with GB / T 17431.1-2010 light aggregate performance standard, in which the cylinder compressive strength is 12Mpa, and the bulk density is 889Kg / m 3 , for Cu 2+ The adsorption capacity is 6.42mg / g.

example 3

[0045] Example 3: Slowly add 5% of the mass of the solid mixture into a 30% hydrogen peroxide solution, and stir for 2 minutes; after mixing evenly, slowly add 5% of the mass of the solid mixture into water glass with a modulus of 3.4, and stir for 1 Minutes; after mixing evenly, continue to slowly add 8mol / L sodium hydroxide solution with 15% of the mass of the solid mixture, put it into the autoclave and steam for 24 hours. The steam curing conditions of the autoclave are: the steam curing temperature is 190° C., and the pressure is 10 atmospheres. Other methods are the same as in Example 1.

[0046] The fly ash ceramsite prepared by the above implementation case, the performance test of the ceramsite fully complies with the performance standard of GB / T 17431.1-2010 light aggregate, in which the cylinder compressive strength is 14Mpa, and the bulk density is 996Kg / m 3 , for Cu 2+ The adsorption capacity is 7.85mg / g.

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Abstract

The invention belongs to the technical field of auxiliary materials of building materials, and provides solid-waste-based high-strength unfired fly ash ceramsite and a preparation method thereof in order to solve the problems that ceramsite prepared from single fly ash is low in strength, cost is increased as the strength of fly ash ceramsite needs to be increased at present and the like in the prior art. The strength of the prepared fly ash ceramsite in the invention reaches 10-14 Mpa. The preparation method comprises the following steps: mixing fly ash, attapulgite, cement, silica fume and diatomite according to a mass ratio of 70: 10: 10: 5: 5, and adding a sodium hydroxide solution accounting for 20-25% of the total mass of the mixed raw materials, a hydrogen peroxide solution accounting for 0.5-5% of the total mass of the mixed raw materials and water glass accounting for 5% of the total mass of the mixed raw materials. According to the invention, the problem of low strength of fly ash serving as concrete aggregate is solved; and the problem that fly ash powder is not easy to recycle as a sewage filter material is solved, and the adsorption performance of common unfired fly ash ceramsite is improved.

Description

technical field [0001] The invention belongs to the technical field of auxiliary materials for building materials, and in particular relates to a solid waste-based high-strength non-burning fly ash ceramsite and a preparation method thereof. [0002] technical background [0003] Fly ash is the fine ash collected from the flue gas after coal combustion, and it is the main solid waste discharged from coal-fired power plants, which is harmful to the environment and human health. In 2017, my country's fly ash output reached 686 million tons, with a comprehensive utilization rate of 75.35%. According to gray model estimates, China's fly ash output will reach 781 million tons in 2020 and 925 million tons in 2024. The resource utilization of fly ash can not only reduce the accumulation of fly ash and pollute the environment. [0004] The comprehensive utilization research of fly ash at home and abroad is mainly concentrated in many fields such as building materials, environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/00C04B38/08C04B18/02C04B111/40
CPCC04B28/00C04B38/009C04B38/0025C04B38/08C04B18/021C04B2111/00017C04B2201/50C04B2111/40C04B18/08C04B14/102C04B18/146C04B14/08C04B12/04C04B22/062C04B22/068
Inventor 苗洋王倩屈湃高峰
Owner TAIYUAN UNIV OF TECH
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