基于旋流微泡浮选柱的高灰细泥浮选优化试验

Flotation experiment optimization of high ash ultra-fine slime based on cyclonic micro-bubble flotation column

介绍了高灰细泥的成因及其对煤泥浮选效果的影响。阐述了旋流微泡浮选柱的工作原理和技术特点,构建了实验室旋流微泡浮选柱系统,并对庞庄矿煤泥进行了分选试验,最后对试验结果进行了优化。通过正交试验得到各因素对各响应值的影响显著性:对于精煤灰分,入料质量浓度>捕收剂用量>起泡剂用量;对于尾煤灰分、精煤产率、浮选完善指标和可燃体回收率,起泡剂用量>捕收剂用量>入料质量浓度。通过优化试验确定煤样最佳浮选条件为:捕收剂用量1600 g/t,起泡剂用量250 g/t,入料质量浓度80 g/L,得到的精煤灰分、尾煤灰分、精煤产率、浮选完善指标和可燃体回收率分别为10.65%,52.35%,59.76%,51.39%和74.14%。通过对比煤泥和精煤的粒度组成,说明精煤灰分降低了17.48%,其中-0.074 mm灰分降低了22.29%,说明旋流微泡浮选柱对庞庄矿煤泥的分选效果较好,特别对高灰细泥分选效果更佳。

Introduce the cause of high ash ultra-fine slime and its influence on slime flotation. Elaborate the working principle and technical features of cyclonic micro-bubble flotation column, establish its laboratory-scale system, conduct the separation experiment of Pangzhuang mine coal slime and optimize the experiment results. For clean coal ash, the effect levels of influencing factors successively are feeding concentration, collecting agent dosage, foaming agent dosage. For railings ash, clean coal yield, flotation perfect index, recovery of combustible, the effect levels of influencing factors successively are foaming agent dosage, collecting agent dosage, feed concentration. The optimal flotation condition is that, the collecting agent dosage are 1600 g/t, the foaming agent dosage are 250 g/t, the feeding concentration are 80 g/L. Under this condition, the ash of clean coal and tailings could reach to 10. 65 percent and 52.35 percent, the clean coal yield is 59.76 percent, flotation perfect index is 51.39 percent, combustible recovery is 74. 14 percent. The comparison of size composition between slime and clean coal show that, the clean coal ash reduce by 17.48 percent, the -0. 074 mm fraction reduce by 22.29 percent. The results show that the cyclonic micro-bubble flotation column has better separation effect on Pangzhuang coal mine slime, especially on the high ash ultra-fine slime.