Optimization of high concentration flotation decarbonization process of fly ash using surfactants

TIAN Lufeng

doi:10.3969/j.issn.1007-7677.2025.02.007

Abstract：In order to solve the problems of uneven distribution of carbon particles in fly ash,high mineral surface energy,easy agglomeration and poor flotation efficiency during high concentration flotation decarburization of fly ash,the optimization method of high concentration flotation decarburization process of fly ash using surfactant can provide theoretical support for improving the separation efficiency and quality of carbon components in fly ash.Fly ash and water were mixed to produce a certain concentration of slurry,and then different types and doses of surfactants were added.The surface properties of mineral particles were changed by surfactants.The flotation decarbonization process of high concentration fly ash was optimized by comparing different types of surfactants,and the performance of differ-ent surfactants was evaluated.When the contact angle of A1 sodium stearate group is 63.91°,the value is the low-est;when determining the decarburization rate and coal quality index of coal sample,the decarburization rate of A2 sodium stearate group is 72.36%,and the coal quality index is 0.59,which is higher;when determining the flota-tion efficiency of coal samples,the flotation efficiency of A2 sodium stearate group is 85%,which is higher.Sodium stearate is an anionic surfactant,which has the best effect on the optimization of high concentration flotation decarbon-ization process of fly ash.