响应曲面法优化赤铁矿纳米气泡反浮选试验研究

Experimental study on optimizing reverse nanobubble flotation of hematite by response surface methodology

针对微细粒赤铁矿浮选困难、效率低等问题,将纳米气泡浮选技术应用于赤铁矿反浮选中,利用纳米气泡特殊的界面特性,改善细颗粒的浮选行为,提高分选指标。以鞍千选矿厂浮选给矿为研究对象,采用Box-Behnken响应曲面法进行试验设计并优化赤铁矿纳米气泡反浮选的药剂用量,分析各因素及各因素之间相互作用对浮选指标的影响。试验结果表明:相比石灰,捕收剂TD-Ⅱ和玉米淀粉对铁品位和铁回收率的影响更显著,并且淀粉与石灰、捕收剂TD-Ⅱ之间的交互作用对铁品位有显著的影响。在确定的淀粉用量3.0 kg/t,石灰用量1.5 kg/t,捕收剂TD-Ⅱ用量0.78 kg/t的最优条件下,获得了铁品位67.32%、铁回收率82.27%的精矿指标。通过浮选动力学对比试验,证实了纳米气泡浮选不仅可以提高浮选速率,而且还可以提高铁回收率。纳米气泡浮选技术的应用有助于解决微细粒赤铁矿高效浮选难题,对改善选矿厂技术指标和经济效益具有十分重要的意义。

In view of the difficulty and low efficiency of fine hematite flotation, nanobubbles with special interfacial properties were applied to reverse the flotation of hematite to improve the flotation behavior and separation performance of fine particles.The Box-Behnken response surface method was used to design the experiments and optimize the reagent dosage for reverse nanobubble flotation of hematite from the flotation feed at Anqian Mineral Processing Plant by specifically analyzing the effect of each factor and the interactions between factors on the flotation performance.The results show that collector TD-Ⅱ and corn starch had more significant impacts on grade and recovery than lime and the interactions between starch, lime, and collector TD-Ⅱ had significant effects on iron grade.The iron recovery is 82.27 % and the iron grade is 67.32 % for the concentrate when 3.0 kg/t corn starch, 1.5 kg/t lime, and 0.78 kg/t collector TD-Ⅱ are added.The kinetic flotation experiments confirm that the introduction of nanobubbles in flotation can improve flotation kinetics and concentrate recovery.The application of the nanobubble flotation process will help resolve the difficulty in the efficient flotation of fine particles, which is of great significance to improving the technical performance indicators and economic benefits of the mineral processing plant.