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Methodologies for recovery of carbonaceous material from coal combustion byproducts in India
Fly ash is a Coal Combustion Byproduct (CCB) and is identified as a substitute for cement manufacturing (Portland cement). Fly ash is the fine fraction of the CCBs that is carried out of the boiler by flue gases. Due to lack of commercial demand for these substance, which is produced in large amount, it is disposed on a large level as pond ash. Consequently, there is a clear need to establish environmental and cost-effective strategies for the use of this carbonaceous waste product. The CCB's generated in India mainly contain fly ash with appreciable amount of unburnt carbon. This unburnt carbon is a harmful component for the effective utilization of fly ash. Methodologies commonly adopted for the separation of carbon from fly ash are restricted to the laboratory studies only. This in turn is mainly because of lack of sufficient information on separation behavior of carbonaceous material from CCB products. Hence in the present paper an attempt is made to understand more about the use of separation processes and process factors that may influence the separation of unburnt carbon besides describing the methodologies available for their characterization. The characterization techniques described are restricted to physical and chemical properties of unburnt carbon. The literature surveyed on characterization studies revealed that several separation processes can be adopted for their separation and the present paper is a description of the attempts made to demonstrate the recovery of unburnt carbon from fly ash and possible avenues of its utilization. The separation methodologies considered for the recovery of carbon from fly ash are: (1) Gravity separation techniques, (2) froth flotation methods, (3) column flotation, (4) agglomeration, (5) electrostatic separation, (6) dry fluidized-bed separation technique [FBS] and (7) carbon burn-out process. The recovered carbon can be used as sorbent in some applications that use activated carbon and at the same time, the reduction of carbon from fly ash increases the pozzolanic quality of gangue and generates another high quality feed material for the production of Portland cement.
Methodologies for recovery of carbonaceous material from coal combustion byproducts in India
Fly ash is a Coal Combustion Byproduct (CCB) and is identified as a substitute for cement manufacturing (Portland cement). Fly ash is the fine fraction of the CCBs that is carried out of the boiler by flue gases. Due to lack of commercial demand for these substance, which is produced in large amount, it is disposed on a large level as pond ash. Consequently, there is a clear need to establish environmental and cost-effective strategies for the use of this carbonaceous waste product. The CCB's generated in India mainly contain fly ash with appreciable amount of unburnt carbon. This unburnt carbon is a harmful component for the effective utilization of fly ash. Methodologies commonly adopted for the separation of carbon from fly ash are restricted to the laboratory studies only. This in turn is mainly because of lack of sufficient information on separation behavior of carbonaceous material from CCB products. Hence in the present paper an attempt is made to understand more about the use of separation processes and process factors that may influence the separation of unburnt carbon besides describing the methodologies available for their characterization. The characterization techniques described are restricted to physical and chemical properties of unburnt carbon. The literature surveyed on characterization studies revealed that several separation processes can be adopted for their separation and the present paper is a description of the attempts made to demonstrate the recovery of unburnt carbon from fly ash and possible avenues of its utilization. The separation methodologies considered for the recovery of carbon from fly ash are: (1) Gravity separation techniques, (2) froth flotation methods, (3) column flotation, (4) agglomeration, (5) electrostatic separation, (6) dry fluidized-bed separation technique [FBS] and (7) carbon burn-out process. The recovered carbon can be used as sorbent in some applications that use activated carbon and at the same time, the reduction of carbon from fly ash increases the pozzolanic quality of gangue and generates another high quality feed material for the production of Portland cement.
Methodologies for recovery of carbonaceous material from coal combustion byproducts in India
Verfahren zum Entfernen von kohlenstoffhaltigen Rückständen, die bei der Verfeuerung von Kohle in indischen Kraftwerken anfallen und den Einsatz bei der Zementherstellung behindern
Surabhi, Singh (author) / Suresh, Nikkam (author) / Udayabhanu, G. (author)
Powder Handling and Processing ; 16 ; 182-189
2004
8 Seiten, 3 Tabellen, 41 Quellen
Article (Journal)
English
Abfallprodukt , Agglomerieren , elektrostatisches Trennen , Flotation , Flugasche , Flugaschenzement , Kohlekraftwerk , Kohlenasche , Kohlenfeuerung , Kohlenstoffgehalt , kohlenstoffhaltiges Material , Materialeigenschaft , Puzzolanzement , Rauchgas , Rückgewinnung , Schaumflotation , Schweretrennen , Trennen (Verfahrenstechnik) , Umweltfreundlichkeit , Wirbelschichtverfahren
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