Experimental Research on Decarbonization of High-CarbonFly Ash by Flotation

Abstract

Abstract: High-carbon fly ash is a kind of solid waste that can not be used directly. In order to reduce the loss on ignition of high-carbon fly ash, the decarbonization test of high-carbon fly ash was carried out. Through grinding test, the best grinding time of high-carbon fly ash is 1.25 min. Through the flotation reagent system test, it is determined that the best reagent system is the dosage of Sec-octyl alcohol 4 kg/t and kerosene 12 kg/t. Through the flotation process test, it is determined that the best flotation process of pulverized high-carbon fly ash is turbine speed of 2 000 r/min, scraping time of 8 min, mineral pulp concentration of 120 g/L and air volume per unit area of 0.30 m³/(m²·min). Through the above tests, the loss on ignition of the decarbonized fly ash is 0.63% and the productivity is 60.64%, which meets the grade I ash loss on ignition requirement.

Key words: high-carbon fly ash, foam flotation, decarbonization, grinding, reagent system, flotation process

CLC Number:

TU526

HU Zhenwen, GUO Yuanxin, LIN Xiangling, LI Qiuyi, ZHENG Shidong. Experimental Research on Decarbonization of High-CarbonFly Ash by Flotation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 907-913.

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