Study on Surface Electrical Properties of Medium and High Rank Coal and Natural Coke Based on Zeta Potential and FTIR
Through the study of the surface electrical properties of coal and natural coke,it can provide a basis for revealing the electromagnetic radiation mechanism of coal and natural coke,judging the floatability of minerals and realizing the separation of different minerals.In order to deeply understand the difference of surface electrical properties between medium and high rank coal and natural coke,and analyze the difference of surface functional group composition between coal and natural coke,Zeta potential and FTIR analysis methods were used to comprehensively analyze the surface characteristics of the samples,and the coupling relationship between surface electrical properties and main functional groups was studied.The results show that:① the Zeta potential of coal samples is generally negative,and the Zeta potential of natural coke samples is positive.At the same time,with the increase of metamorphic degree,the negative functional groups on the surface of the samples decrease and the Zeta potential increases.② After deashing,the negative functional groups on the surface of the sample were destroyed,and the Zeta potential of coal and natural coke was positive,and the Zeta potential value decreased with the increase of coal metamorphism.③ Hydroxyl,COOH and C=O are the main functional groups that affect the Zeta potential.Among them,the effect of C=O on the Zeta potential is greater than that of COOH;hydroxyl-π is the main functional group affecting Zeta potential in hydroxyl structure.The research results provide a basis for further exploring the electromagnetic radiation mechanism and flotation performance of coal and natural coke.
middle-high rank coalnatural cokeZeta potentialFTIRfunctional groups
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