Abstract
Crude oil ash is the residue that is produced during oil combustion for instance fly ash, bottom ash or boiler slag which was primarily produced from the combustion of coal. With growth in oil burning power station, huge amount of fly ash considered as organic materials which are normally disposed in an on-site disposal system without any commercialization purpose. Previous researchers have studied the extraction of silica from agricultural wastes such as palm ash and rice husk ash (RHA) and FA (fly ash) by using leaching treatment method. In this study, the weaker acid, citric acid solution was used to replace the strong acid in leaching treatment to process. Result showed that the loss on ignition materials can be decrease to 12%. Meanwhile the silica can be extracted up to 54.4% from FA using citric acid leaching treatment under the optimum reaction time of 60 minutes with solution temperature of 60°C and concentration of citric acid 5% receded by gradual combustion at 900°C for 3 hours.
Highlights
INTRODUCTIONThe components of fly ash vary considerably, for instant many coal-bearing rock all fly ash includes substantial amounts of silicon dioxide (SiO2), both amorphous and crystalline, and calcium oxide (CaO), both being endemic ingredients, The constituents depend upon the specific coal/oil bed makeup (Avwiri et al, 2012)
The components of fly ash vary considerably, for instant many coal-bearing rock all fly ash includes substantial amounts of silicon dioxide (SiO2), both amorphous and crystalline, and calcium oxide (CaO), both being endemic ingredients, The constituents depend upon the specific coal/oil bed makeup (Avwiri et al, 2012).About 43% of fly ash in US is recycled (Davis et al, 1977), often used as a Pozzolan to produce hydraulic cement or hydraulic plaster or a partial replacement for Portland Cement in concrete production
Fly ash was treated in a pyrolysis/combustion plasma system to reduce the fraction of carbon
Summary
The components of fly ash vary considerably, for instant many coal-bearing rock all fly ash includes substantial amounts of silicon dioxide (SiO2), both amorphous and crystalline, and calcium oxide (CaO), both being endemic ingredients, The constituents depend upon the specific coal/oil bed makeup (Avwiri et al, 2012). Previous researchers have studied the extraction of silica from by using leaching treatment method, silica can be extracted up to 44% from coal bottom ash using citric acid leaching treatment under the optimum reaction time of 60 minutes with solution temperature of 600°C and concentration of citric acid more than 2% (Yahya et al, 2017). Another method of treatment chemically treats fly ash with ferrous sulfate solutions to immobilize hazardous leachable trace elements after disposal (Bhattacharyya et al, 2008). In the present work a sample of Al_ Musayyib thermal power station fly ash in Iraq was treated at different condition and analyzed to control the SiO2% and L.O.I%, the treatment was citric acid leaching to concentrate the silica and reduction percentage of loss on ignition materials (L.O.I) and study their change in chemical composition and their pozolanic activity index (ASTM C311, 2005)
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