以王坪高灰煤为研究对象,考察了微生物接菌量、预处理时间及 pH 值对其微生物预处理反浮选脱灰效果,对微生物反浮选机理进行了初步探讨,并将微生物预处理反浮选试验与常规反浮选试验的浮选效果进行了对比。结果表明,经微生物预处理后反浮选试验取得明显效果,微生物接菌量8mL,预处理4d,矿浆 pH 值为7时,精煤产率可达到76.78%,且精煤灰分为27.12%,较原煤灰分降低13.73%,微生物预处理反浮选方法对精煤和矿物质具有较强的选择性。常规反浮选试验中,十二胺用量1000g/t,糊精用量600g/t时,分选效果最佳,精煤产率达88.15%,但精煤灰分高达38.66%,脱灰效果较差,常规浮选药剂对精煤和矿物质的选择性较差。%The investigation was carried out to study the effects of microbial inoculation amount, pretreatment time and pH on reverse flotation of microbial pretreated Wangping high ash coal and the mechanism of microbial reverse flotation.We compared the reverse flotation performance of microbial pretreatmentwith the conventional reverse flotation methods and found that the method of microbial pretreatment showed obvious effect on reverse flotation.When the volume of microbial inoculation was 8 mL with a pretreatment time of 4 d and pH 7,the yield of cleaned coal can be up to 76.78 % and the ash content is 38.66 % reduced by 13.73 % from the feed coal,which prove that the reverse flotation method of microbial pretreatment can effectively distinguish the cleaned coal and mineral.While for the conventional reverse flotation experiments,at the optimum reagent conditions with a dosages of dodecylamine1000 g/t and dextrin 600 g/t,the yield of cleaned coal can be up to 88 % but the de-ashing effect is not ideal with the ash content of 38.66%,which indicate that conventional flotation agents have poor selectivity between cleaned coal and mineral.
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