浮选粒度及浓度对铅锌硫化矿浮选分离的影响

Flotation Separation of Lead-Zinc Sulfide Ore with Different Flotation Particle Size and Concentration

浮选粒度及浓度是影响铅锌选矿指标的重要工艺参数。为进一步提高锡铁山矿铅锌浮选指标,节省选矿生产成本,重点考察了浮选粒度及浓度对铅锌选矿效果的影响。浮选试验结果表明,适合该矿石浮选的最佳浮选粒度为-0.074 mm占55%;选铅浮选浓度为48%,选铅尾矿无需浓缩后选锌浮选浓度为47%。在该条件下,利用现场生产流程及药剂制度处理该矿石,闭路试验可以获得含铅74.82%、含锌2.97%、铅回收率93.41%的铅精矿,含锌46.08%、锌回收率94.03%的锌精矿,含硫40.75%、硫回收率71.06%的硫精矿;相比现场浮选粒度及浓度条件下闭路试验指标,铅、锌、硫回收率分别提高了2.36,2.54,2.98个百分点。适宜的浮选粒度有益于目的矿物颗粒与气泡碰撞、附着,并保证了气泡对矿物具备足够的负载能力,促进了目的金属矿物的高效上浮;高浓度浮选工艺增加了矿浆中药剂浓度,强化了药剂与矿物的作用能力,并有效强化了气泡对有用疏水颗粒的拱抬效应,提高了铅锌硫矿物的分选指标。

The particle size and concentration of flotation are important parameters in the process of lead and zinc mineral processing.In order to further improve the flotation index of Xitieshan Lead-Zinc Mine and save the cost of mineral processing,the influence of particle size and concentration of flotation on the effect of lead zinc ore dressing was mainly investigated. Flotation test results showed that the best flotation particle size was-0. 074 mm accounting for 55%,lead flotation concentration was 48%,lead tailings did not need to be concentrated and zinc flotation concentration was 47%. Under this condition,the ore was treated by the field production flow and reagent system,a lead concentrate with Pb grade of 74. 82%,Zn grade of 2. 97%,Pb recovery rate of 93. 41%,and a zinc concentrate with Zn grade of 46. 08%,Zn recovery rate of 94. 03%,and a sulfur concentrate with S grade of 40. 75%,S recovery rate of 71. 06%could be obtained through closed circuit experiment. Compared with the closed-circuit test index under the condition of floatation size and concentration at production field,the lead,zinc,sulfur recovery rate increased by 2. 36,2. 54,2. 98 percentage points,respectively. The suitable flotation particle size was beneficial for the collision and adhesion between the mineral particles and air bubbles,and ensured that the bubbles had sufficient loading capacity to the mineral,which promoted the efficient ascent of metal minerals. The high concentration flotation technology increased the concentration of the reagent,and strengthened the interaction capability of the agent and mineral,and effectively strengthened the arch lift effect of bubble on useful hydrophobic particles,thus improving the sorting index of the lead and zinc sulfide minerals.