Comparative study on evaluation methods of accurate acid production potential of coal gangue
In order to prevent major acid drainage pollution accidents,this study aims to improve the ac-curacy of acid production potential evaluation of mine rocks in the prediction of acid drainage.Specific-ally,this paper introduced existing calculation methods of acid-producing potential,and then determined the acid-producing mineral contents in some sulfur minerals and coal gangue samples by three-step se-quential extraction method,which is then compared with the traditional method of calculating the maxi-mum acid-producing potential by measuring total sulfur.Results show that:1)the acid-producing poten-tial of coal gangue is dependent on the mass percentage content of each acid-producing sulfur and the corresponding unit acid value;2)except for sample SC,the acid-producing potential calculated by acid-producing sulfur content is lower than(with different degrees)the acid-producing potential predicted by total sulfur.The sulfur in the sample SC is mainly arsenopyrite sulfur,which has a higher acid value per unit than pyrite sulfur,resulting in a higher acid potential calculated by SC sample than predicted by to-tal sulfur;3)the three-step sequential extraction is suitable for samples with iron and copper sulfides as the main sulfur minerals;4)when other sulfide components increase and blank samples are unevenly mixed,the results will be disturbed to some extent.This research provides evidences to justify the evalu-ation of accurate acid production potential of coal gangue in mining area.
acid production potentialsulfur mineralcoal ganguethree-step sequential extractionacid mine drainage prediction
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