Effect of Low-Quality Coal Raw Materials on Extraction of Mineral Fulvic Acids
We extracted mineral fulvic acids from different low-quality coal raw materials(moss peat,herba-ceous peat,woody peat,lignite,bituminous coal,and weathered coal)by an alkali-extraction and acid-precipitati-on method,and determined its purity by volumetric method.Moreover,we characterized the structure by UV-Vis,FTIR,fluorescence spectroscopy,1 HNMR,and XRD.The results show that low-quality coal raw materials have a significant effect on the yield and purity of mineral fulvic acids.The yield and purity of mineral fulvic acids in moss peat are the highest,reaching 10.56％and 27.78％,respectively.The chemical structures of min-eral fulvic acids from different raw materials are similar,while the molecular weights of which are different.The molecular weight of mineral fulvic acids from woody peat is the greatest,while that of mineral fulvic acids from weathered coal is the smallest.Mineral fulvic acids from peat(moss peat,herbaceous peat,and woody peat)has more functional group types,among which the functional group type of mineral fulvic acids from moss peat is the most diverse such as hydroxyl,ketone,aldehyde,and carboxyl groups,and the content of functional groups is the highest.The types and contents of functional groups of mineral fulvic acids from bituminous coal are the least.Mineral fulvic acids from moss peat and woody peat contain more aliphatic carbon,while mineral fulvic acids from herbaceous peat and weathered coal contain more aromatic carbon.This study indicates that moss peat is more suitable as a raw material for the extraction of mineral fulvic acids in low-quality coal resources.
low-quality coalmineral fulvic acidalkali-extraction and acid-precipitation method
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