Coal gangue-pulverized fuel ash-silica sand tailing system all-waste-residue foam ceramic and preparation method thereof

A technology of fly ash and coal gangue, which is applied in the field of coal gangue-fly ash-silica sand tailings system full waste slag foam ceramics and its preparation, can solve the problems of low utilization rate and achieve the effect of high waste slag utilization rate

Inactive Publication Date: 2018-08-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to increase the amount of waste slag introduced and break through the problem of low utilization rate of various tailings caused by compositional differences, the present invention mainly utilizes the synergy, complementarity and mutual restraint effect among the chemical compositions of tailings to give full play to the internal components of each tailings In order to obtain foam ceramics with high utilization rate of waste slag and characteristics of light weight, high strength, heat insulation, heat preservation, fire prevention, corrosion resistance and no secondary pollution, it can be used as the top floor of buildings, non-load-bearing walls and interior and exterior walls thermal insulation and fireproof materials

Method used

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  • Coal gangue-pulverized fuel ash-silica sand tailing system all-waste-residue foam ceramic and preparation method thereof
  • Coal gangue-pulverized fuel ash-silica sand tailing system all-waste-residue foam ceramic and preparation method thereof
  • Coal gangue-pulverized fuel ash-silica sand tailing system all-waste-residue foam ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After weighing and uniformly mixing various raw materials according to the mass percentage of coal gangue 47.5%, fly ash 47.5%, and silica sand tailings 5%, Fe 2 o 3 The weight accounts for 3.61% of the total weight, and the water of 3-5% of the total weight of raw materials is used as a wetting agent. After mixing evenly, put it in a metal mold and press it into a foam ceramic body at 30MPa, and put it in a drying box for drying; Place the fully dried green body in a resistance furnace to raise the temperature to 1225°C at a constant speed of 5°C / min, keep it warm for 1 hour and then cool it down naturally. The bulk density of the prepared ceramic foam is 0.76g / cm 3 , The porosity is 72.4%, the compressive strength is 10.2MPa, the bending strength is 8.4MPa, the acid resistance is 99.04%, and the alkali resistance is 99.69%.

Embodiment 2

[0029] After weighing various raw materials according to the mass percentage of coal gangue 45%, fly ash 45%, and silica sand tailings 10%, and mix them uniformly, Fe 2 o 3 The weight accounts for 3.43% of the total weight, and the water of 3-5% of the total weight of the raw materials is used as a wetting agent, mixed evenly, put into a metal mold, pressed at 25MPa to form a foam ceramic body, and put into a drying box for drying; Put the fully dried green body in a box-type resistance furnace and raise the temperature to 1220°C at a constant speed of 5°C / min, keep it warm for 1 hour and then cool it down naturally. The bulk density of the prepared ceramic foam is 0.79g / cm 3 , the porosity is 69.1%, the compressive strength is 11.3MPa, the flexural strength is 7.3MPa, the acid resistance is 98.91%, and the alkali resistance is 99.61%.

Embodiment 3

[0031] After weighing and uniformly mixing various raw materials according to the mass percentage of coal gangue 57%, fly ash 38%, and silica sand tailings 5%, Fe 2 o 3 The weight accounts for 3.27% of the total weight, and the water of 3-5% of the total weight of raw materials is used as a wetting agent. After mixing evenly, put it in a metal mold and press it into a foam ceramic body at 30MPa, and put it in a drying box for drying; Put the fully dried green body in a box-type resistance furnace to raise the temperature to 1230°C at a constant speed of 5°C / min, keep it warm for 1 hour and then cool it naturally. The bulk density of the prepared ceramic foam is 0.81g / cm 3 , the porosity is 65.2%, the compressive strength is 13.7MPa, the bending strength is 8.3MPa, the acid resistance is 99.19%, and the alkali resistance is 99.71%.

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Abstract

The invention discloses coal gangue-pulverized fuel ash-silica sand tailings system all-waste-residue light-weight high-strength inorganic foam ceramic and a preparation method thereof. Coal gangue, pulverized fuel ash and silica sand tailings are adopted as raw materials, a bit of water is additionally added as a wetting agent, the foam ceramic is endowed with a porous structure through a gas released by reaction of inner compositions of the tailings at high temperature, and the foam ceramic with an excellent combination property is obtained. The waste residue utilization rate is high, the preparation process is simple and low in cost, a main phase is a calciclase phase, and the foam ceramic has light weight, high strength, heat insulation, heat preservation, fire protection, corrosion resistance and no secondary pollution, has the volume density being 0.68 to 0.81g.cm<-3>, the porosity being 65.2 to 74.7 percent, the compressive strength being 8.5 to 13.7MPa, the bending strength being 5.3 to 8.4MPa, the acid resistance being 98.91 to 99.94 percent, and the alkali resistance being 99.61 to 99.83 percent, and can be used as a heat-insulation heat-preservation fire-protection material for a building top layer, a nonbearing wall and inner and outer walls.

Description

technical field [0001] The invention relates to the fields of recycling of solid waste materials, energy saving of buildings and new building ceramic materials, in particular to the preparation of light-weight and high-strength inorganic foam ceramics by using the whole waste residue of coal gangue-fly ash-silica sand tailings system as raw materials and a preparation method thereof. Background technique [0002] In recent years, research aimed at recycling industrial solid waste and realizing the secondary utilization of resources has attracted more and more attention. my country is a country with large mineral reserves, and its output of coal mines, iron and steel, non-ferrous metals and other resources is at the leading level in the world. But at the same time, a large amount of industrial solid waste, such as coal gangue, fly ash, red mud and various tailings, has been produced due to factors such as backward production technology and mining equipment. Most of these was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/132C04B33/135
CPCC04B33/132C04B33/1352C04B38/00Y02P40/60
Inventor 卢安贤刘涛涌杨琦峰韩磊刘建磊李翠高翔龙于静波汤悟夫林昌伟桂花
Owner CENT SOUTH UNIV
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