Physico-chemical characteristics of fly ash samples from thermal power plants of Orissa
Year: 1997
Type: article
Abstract: Some physico-chemical characteristics of three fly ash samples have been studied with an objective to create a data base for different fly ash samples in the country. It has been observed that relevant physical properties of the samples show systematic variation with particle size distribution. Thus, while apparent density and optical or geometrical area increase with fmeness of the particles from sample I to 3, true density, voidage and void volume exhibit opposite behaviour. Batch leaching studies indicate that whereas for samples I and 2 most of the trace metals (except Cu) leach out rapidly from the surface of the ash particles in the pH range 6.4-7.5, under acidic conditions (pH - 4.5) the rates of leaching of most trace metals, except Co and Cd, are relatively slow for sample 3. The pH values of zero charge of the three major oxide constituents namely, Si02, Fe203 and Al203 as determined by the solid addition method, conform more or less to the litrature values of 2.5, 7.0 and 9.5 respectively. Viscosity measurements of aqueous suspension indicates that sample 3 is least hydrated in water and therefore shows low viscosity value even at high concentration of slurry. Fly ash is the product of combustion of coal in boiler furnace of the thermal power plants. Because of the abundant reserve of coal in India, thermal power contributes more than 75% of the total power generation in the country. As more and more thermal power plants are being set up in the country to meet the ever increasing demand of
Authors: Ranjan Kumar Mohapatra, S. B. Kanungo
Language: English
Topic: Coal and Its By-products
Subfield: Geochemistry and Petrology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2483238043