Elucidating the enhancement of kaolinite flotation by iron content through density functional theory: A study on sodium oleate adsorption efficiency  

作　　者：Lingyun Liu Chuilei Kong Hongyu Zhao Fangqin Lu 

机构地区：[1]Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining,Huainan 232001,China [2]Department of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China [3]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Mining Science and Technology》2024年第6期855-866,共12页矿业科学技术学报（英文版）

基　　金：supported by the Natural Science Foundation of China(No.52174232);the Project was supported by Open Research Grant of Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining(Nos.EC2022003 and EC2023005);Anhui University of Science and Technology 2023 Graduate Student Innovation Fund(No.2023cx2106);Open Research Grant of Anhui Engineering Research Center for Coal Clean Processing and Carbon Emission Reduction(No.CCCE-2023003).

摘　　要：This study delves into the intricate relationship between iron(Fe)content in kaolinite and its impact on the adsorption behavior of sodium oleate.The effects of different iron concentrations on adsorption energy,hydrogen bond kinetics and adsorption efficiency were studied through simulation and experimental verification.The results show that the presence of iron in the kaolinite structure significantly improves the adsorption capacity of sodium oleate.Kaolinite samples with high iron content have better adsorption properties,lower adsorption energy levels and shorter and stronger hydrogen bonds than pure kaolinite.The optimal concentration of oleic acid ions for achieving maximum adsorption efficiency was identified as 1.2 mmol/L across different kaolinite samples.At this concentration,the adsorption rates and capacities reach their peak,with Fe-enriched kaolinite samples exhibiting notably higher flotation recovery rates.This optimal concentration represents a balance between sufficient oleic acid ion availability for surface interactions and the prevention of self-aggregation phenomena that could hinder adsorption.This study offers promising avenues for optimizing the flotation process in mineral processing applications.

关 键 词：Iron Influence Sodium Oleate Adsorption Kaolinite Surfaces Molecular Interaction Analysis Flotation Efficiency Optimization 

分 类 号：TD97[矿业工程—选矿] TD923[理学—物理化学] O641.1[理学—化学]