| In order to solve the severe problem and urgent demand of the environmental influence and low utilization value caused by the disposal of waste architectural ceramics like accumulating,land-filling and a small amount of replacement of sand and gravel in ordinary concrete,the advantages of granulation,high hardness,compactness,high strength,and high temperature resistance of architectural ceramics need to be fully excavated and utilized,and scientific research of high-value utilization of waste architectural ceramics have a significant value.This paper is based on the bottleneck problem of large fluctuations in the composition of waste architectural ceramics,and low melting point components of pigments/glazes affecting high-temperature performance,by component design,microstructure "core-shell" shielding and low-melting component phase optimization and control technology,the impact of harmful components deteriorating high-temperature performance has been reduced.Using waste architectural ceramics with different particle sizes as the main raw materials,the preparation technology of hightemperature-resistant materials used at 1000 ? was studied,which can be applied in the construction foundation of high temperature thermal equipment and flue/chimney.The research work will provide an important basis for the preparation of high-value high-temperature-resistant materials from waste architectural ceramics.The main research results are as follows:(1)using waste architecture ceramics in different diameter as aggregate and fine powder,the influence of parameters of particle grading and heat treatment on the influence law of the total amount of waste architectural ceramic-based high-temperature materials.The element composition and distribution of two types of waste architectural ceramics,colored glaze and colorless glaze,were analyzed respectively,and the migration of waste architectural ceramic components after heat treatment at 1100 ? and the shielding effect of coating materials on the pigments/glazes components of waste architectural ceramics were studied.The results show that:when the mass ratio of waste architectural ceramic particles with different particle sizes--coarse particles: medium particles: fine powder = 45:25:30,after heat preservation at 1100 ? for 3 hours,the comprehensive performance of the total amount of waste architectural ceramic-based high temperature resistant materials is the better;in addition,after heat treatment at 1100 ?,the element distribution and morphology of waste architectural ceramic particles remain basically stable.The shell formed by wrapping the surface layer of the waste architectural ceramic particles with the coating material has a good shielding effect on the low melting point components in the waste architectural ceramics,which proves that it can effectively reduce the deterioration of the high temperature performance of the harmful components in the waste architectural ceramics.(2)Clay/bauxite fine powder and metakaolin/bauxite fine powder are used as coating materials to wrap waste architectural ceramic particles and explore the influence of heat treatment temperature and clay/metakaolin addition on the properties of waste architectural ceramic-based high-temperature materials.The results show that: when the heat treatment temperature is 1100 ?and the clay/metakaolin additive amount is 10 wt%,that is,the content of waste architectural ceramics is 85 wt%,the overall performance of the prepared materials is the better,that is,the strength of the prepared material is higher when the amount of waste architecture ceramics is high.(3)The strength acquisition mechanism of waste architectural ceramic-based high temperature resistant materials at different temperatures was studied.The results show that the plasticity of fine clay powder and raw bauxite powder can help improve the compactness of the sample,and the normal temperature strength after heat treatment at different temperatures is slightly greater than the total amount.Since metakaolin will recrystallize at about 1000 ? to form mullite crystal nuclei,which will help the growth of mullite crystals,adding metakaolin will help improve the strength of the waste architecture ceramics based high-temperature-resistance materials at 1000 ?.(4)The factors affecting the thermal shock resistance and the high temperature strength of the waste architectural ceramics based high-temperature-resistance materials were studied.The results show that a proper amount of pores help to improve the thermal shock resistance of the sample.The high temperature strength of the sample at room temperature to 1000 ? increases with the increase of temperature;the anti-fly ash erosion experiment of waste incinerator showed that the prepared waste architectural ceramic-based high temperature resistant material has good fly ash erosion resistance,and the corrosion mechanism of fly ash from waste incinerators based on waste architectural ceramics-based high-temperature materials is "melting-infiltration". |
PDF Full Text Request