中灰分煤解离浮选试验研究

Experimental study on dissociation flotation for mid-ash coal

为了探索中灰分煤解离浮选脱硫降灰的可行性,利用磨矿方法对1.4~1.5 kg/L密度级煤样进行解离试验,并对各解离程度的煤样进行浮选分步释放试验。试验结果表明:磨矿可以使煤样充分解离,低灰物料累计产率可达78%,随着解离程度的提高,解离后1.4~1.5 kg/L密度级物料的灰分显著降低;浮选方法很难高效地将小于200网目低灰物料回收,且无机硫易污染低灰煤炭;煤样磨矿至小于120网目最有利于浮选,灰分为12%时,理论浮选精煤产率约为32%,理论浮选精煤硫分约为1.10%。中灰煤磨矿解离浮选有助于提高精煤产率。

In order to investigate the feasibility of desulfurization and ash reduction by dissociation flotation for mid-ash coal,a grinding method was employed to perform dissociation tests on 1.4~1.5 kg/L density level coal samples,followed by float-sink release tests on each degree of dissociated coal sample.The experimental results showed that grinding could promote full dissociation of the coal sample with an accumulated yield of low-ash material up to 78%.As the degree of dissociation increased,there was a significant reduction in ash content observed in 1.4~1.5 kg/L density level materials after being subjected to the process.However,the flotation method is difficult to recover the low ash material<200 mesh efficiently,and inorganic sulfur is easy to pollute low ash coal.The coal sample grinding to<120 mesh size was identified as the most optimal condition for flotation,resulting in a theoretical clean-coal recovery rate of approximately 32%and a theoretical clean-coal sulfur content of about 1.10%when ash content is at 12%.Dissociation flotation by grinding mid-ash coal samples can significantly improve the yield of clean coal.