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Technology for preparing microcrystal glass by utilizing blast furnace water granulated slag and coal ash

A technology of glass-ceramics and blast furnace slag, which is applied in the technical field of preparing glass-ceramics by using blast furnace slag and fly ash, which can solve the problems of complex process procedures, low utilization rate of waste slag, and addition of crystal nucleating agents, and achieve simplification Process flow, reduce production cost, reduce the effect of sintering temperature

Inactive Publication Date: 2010-10-06
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are mainly two common preparation methods for waste slag glass-ceramics. One is the melting method, that is, the overall crystallization method. The process flow is: raw material preparation→glass melting→casting molding→nucleation, crystallization→cold processing, The problem with this method is that the glass melting temperature is high, crystal nucleating agents need to be added, and the requirements for raw material components are high, so it is rarely used in the actual production of glass ceramics; the other is the sintering method, and its process flow is: raw material preparation →Glass melting→water quenching→crushing→forming→nucleation, crystallization→cold processing, because this method has the characteristics of low melting temperature and strong crystallization ability, it is currently a commonly used method for preparing waste slag glass-ceramics. The process is complicated, the production cost is high, and the utilization rate of waste residue is low, which is not conducive to large-scale commercial production and application

Method used

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  • Technology for preparing microcrystal glass by utilizing blast furnace water granulated slag and coal ash
  • Technology for preparing microcrystal glass by utilizing blast furnace water granulated slag and coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Screening The blast furnace slag is milled in a ball mill for 24 hours, passed through a 200-mesh sieve, and the water slag powder of <200 mesh is obtained;

[0054] The mixture is mixed with 91% water slag powder, 5% fly ash and 4% sodium carbonate by weight to make a mixed powder;

[0055] Slurry mixing the mixed material with balls and water at a ratio of 1:1.5:1.5, ball milling for 2 hours to make a slurry, drying at 80°C to obtain a wet material with a moisture content of ≤5%;

[0056] Granulation: adding 5% glycerin by weight of the wet material to the wet material for granulation to obtain pellets;

[0057] Press and press the pellets under 25MPa to obtain green body;

[0058] Crystallization: Crystallize the green body at 840°C for 40 minutes to precipitate the crystal phase of the glass powder;

[0059] Sintering The crystallized green body was sintered at 1200° C. for 1 hour at a heating rate of 5° C. / min to obtain glass ceramics.

[0060] Polishing the sur...

Embodiment 2

[0063] In this embodiment, the process and parameters are substantially the same as those in Embodiment 1, and the same parts will not be repeated, and only the differences will be described below:

[0064] In the mixing process, the raw materials consist of 86% water slag powder, 10% fly ash and 4% sodium carbonate by weight;

[0065] In the pulping process, the ratio of the mixed material to the ball and water is 1:2:2, and a wet material with a moisture content of ≤4% is obtained;

[0066] In the granulation process, adding liquid paraffin to the wet material for granulation;

[0067] In the pressing process, the pressing strength is 30MPa;

[0068] In the crystallization process, the green body is crystallized at 900° C. for 1 hour;

[0069] In the sintering process, the crystal is sintered at 1150° C. for 2 hours, and the heating rate is 8° C. / minute.

[0070] The waste slag glass-ceramics produced by the embodiment of the present invention has a density of 2.55g / cm 3...

Embodiment 3

[0072] In this embodiment, the process and parameters are substantially the same as those in Embodiment 1, and the same parts will not be repeated, and only the differences will be described below:

[0073] In the mixing process, the raw materials consist of 76% water slag powder, 20% fly ash and 4% sodium carbonate by weight;

[0074] In the pulping process, the ratio of the mixed material to balls and water is 2:1:1, and dried at 90°C to obtain a wet material with a moisture content of ≤2%;

[0075] In the granulation process, adding water to the wet material for granulation;

[0076] In the pressing process, the pressing strength is 100MPa;

[0077] In the crystallization process, the green body is crystallized at 800°C for 2 hours;

[0078] In the sintering process, the crystal is sintered at 1200° C. for 40 minutes, and the heating rate is 10° C. / minute.

[0079] The waste slag glass-ceramics produced by the embodiment of the present invention has a density of 2.26g / cm...

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Abstract

The invention discloses a technology for preparing microcrystal glass by utilizing blast furnace water granulated slag and coal ash, used for solving the problems that technology is complex, production cost is high, waste residue utilization factor is low and large scale commercial production is not benefited in the existing microcrystal glass preparation technology. The technology includes the following processes: screening, blast furnace water granulated slag is smashed and screened, thus obtaining water granulated slag powder less than 200 meshes; material mixing, coal ash with weight percent less than or equal to 20% and auxiliary solvent with weight percent less than or equal to 10% are added into the water granulated slag powder, the balance is water granulated slag powder, thus obtaining mixed powder material; pulping, the mixed material is pulped and then dried, thus obtaining wet material with moisture content less than or equal to 5%; pelleting, binder less than or equal to 5% weight of the wet material is added into the wet material, thus obtaining granules; tabletting, crystallizing and sintering, the granules are subject to tabletting, crystallizing and sintering, thus obtaining waste residue microcrystal glass. The invention has the characteristics of simple technology, low production cost and high waste residue utilization factor.

Description

technical field [0001] The invention relates to a process for preparing glass-ceramic building boards, in particular to a process for preparing glass-ceramics by using blast furnace slag and fly ash. Background technique [0002] The iron slag generated in the blast furnace ironmaking process is generally called blast furnace slag; the molten blast furnace slag is quenched with water or a mixture of water and air to form a sandy glassy substance called blast furnace slag. Fly ash is a clay-like volcanic material emitted by coal combustion. It is a powdery substance collected by a dust collector after pulverized coal is burned at high temperature in a boiler. The annual discharge of fly ash in my country has reached 30 million tons. With the development of the power industry, the discharge of fly ash from coal-fired power plants in my country will continue to increase year by year. At present, there are few ways to utilize industrial waste residues such as blast furnace slag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03C6/00C03B32/02
Inventor 卢红霞刘红玉许红亮陈德良王海龙杨道媛张锐
Owner ZHENGZHOU UNIV
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