In order to explore the feasibility of cemented filling classified tailings in an iron mine in Anhui province,based on the analysis of physical and chemical characteristics of test materials,the flocculation settling test of classified tailings,the strength test of backfill and the fluidity test of filling slurry were carried out.The results show that the optimum parameters for density of classified failings is 30％mortar concentration and 30 g/t flocculant addition.Under the same ratio,the strength of classified tailings at each age is lower than that of whole tailings.In order to meet the requirements of mine strength,classified tailings filling needs to increase the ash sand ratio from 1∶12 to 1∶10 when the mass concentration remains unchanged.The flowability of classified tailings is lower than that of full tailings,but there is little difference in the whole,and both can meet the requirements of mine filling.The comprehensive determination of the critical flow state concentration of the classified tailings slurry test under various ash sand ratio conditions is not less than 70％.The research results provide data support for the application of graded tailings in mine filling.
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