Abstract
Given the amount of industrial waste produced and collected in the world today, a recycling and recovery process is needed. The study carried out on this subject focuses on the valorization of one of these industrial wastes, namely the fly ash produced by an ultra-supercritical coal power plant. This paper describes the use and recovery of fly ash as a high percentage reinforcement for the development of a new high-performance composite material for use in various fields. The raw material, fly ash, comes from the staged combustion of coal, which occurs in the furnace of an ultra-supercritical boiler of a coal-fired power plant. Mechanical compression, thermal conductivity, and erosion tests are used to study the mechanical, thermal, and erosion behavior of this new composite material. The mineralogical and textural analyses of samples were characterized using Scanning Electron Microscopy (SEM). SEM confirmed the formation of a new composite by a polymerization reaction. The results obtained are very remarkable, with a high Young’s modulus and a criterion of insulation, which approves the presence of a potential to be exploited in the different fields of materials. In conclusion, the composite material presented in this study has great potential for building material and could represent interesting candidates for the smart city.
Highlights
Published: 3 June 2021Fly ash is a thermal process residue; more precisely, it is the product of coal combustion in thermal power plants
Experimental measurements of the thermal conductivity of composite materials based on the results presented in Table 3 have proven that this material has an insulating potential
The results indicate that the thermal conductivity of the new composite material is low
Summary
Fly ash is a thermal process residue; more precisely, it is the product of coal combustion in thermal power plants. As a rule, they are obtained by electrostatic separation or mechanical precipitation of combustion fumes. It is widely realized that fly ash should be considered a useful mineral resource, and the development of technologies for high utilization of fly ash is important [1,2]. Understanding the characteristics of ash particles and the transformation of coal minerals during combustion are essential to the development of ash utilization technologies. The transformation of coal minerals to ash during combustion inside boilers is very complicated. About 80% of the coal minerals are transformed into fly ash particles during combustion. The composition of coal ash is complicated, containing amorphous materials and crystallites such as silica, mullite, iron oxide, calcium oxide, etc
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