Selective flocculation flotation of ultra-low-ash anthracite
Taking the clean coal of gravity separation from a coal preparation plant of Ning XIA Coal Industry Co.,LTD as the research object,the influence of the dosage of collector,frother and flocculant on the flotation indexes was investigated by grinding to the fine-grained coal samples of less than 45 micrometers,and flotation was carried out by using flotation machine with the slurry concentration of 60 g/L,and diesel oil was used as the collector,sec-octanol was used as the frother,and polyacrylamide was used as the flocculating agent.At the same time,selective flocculation of nonionic,cationic and anionic polyacrylamides was also analyzed.The results showed that the ash content of flotation concentrate increased with the increase of diesel oil dosage,and the concentrate yield and flotation perfect index showed the same trend.With the increase of diesel oil dosage,the concentrate yield reached the maximum of 93.10%and the flotation perfect index reached the maximum of 46.82%when the dosage of diesel oil was 3,000 g/t,and then the concentrate yield and the flotation perfect index decreased gradually.With the increase of foaming agent sec-octanol,the ash content of flotation coal firstly stabilized at 1.43%,and the production rate showed a trend of slow decrease,and when the dosage was 200 g/t,the ash content and production rate of the coal reached the lowest at the same time,which were 1.35%and 88.77%respectively,and the flotation perfect index at this time also reached the maximum of 47.29%,and then the concentrate yield and the ash content increased gradually,and the flotation perfect index showed a decreasing trend.Thereafter,the concentrate yield and ash content gradually increased,and the flotation perfect index showed a decreasing trend.Compared with nonionic and cationic polyacrylamide,the flotation effect of anionic polyacrylamide PAM is better.When the dosage of PAM is 90 g/t,the dosage of collector is 3000 g/t,and the dosage of frothing agent is 200 g/t,the ash content of flotation concentrate can be obtained as 1.24%,the recovery rate is 88.75%,and the flotation perfect index is 50.93%.
floatationpolyacrylamideselective flocculationperfect index flotation
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