320m^3自吸气浮选机动力学性能研究和工程化

Kinetics research and application of the 320m^3 self-aeration flotation cell

自吸气浮选机能够自吸空气,可以简化浮选系统的配置,是一种广泛应用的浮选机。相对于充气式浮选机,自吸气浮选机动力学性能参数与设备的结构和运转参数之间的关系更为复杂。本文通过清水动力学测试,研究了我国容积最大的320m^3自吸气浮选机的关键性能参数,研究表明:叶轮浸没深度对浮选机的吸气量影响最大,转速次之;叶轮插入深度和转速对浮选机的循环量影响较大,而叶轮浸没深度对循环量影响较小;浮选机的空气分散度达到3以上,空气分散均匀。320m^3自吸气浮选机在多宝山铜钼矿二期5.5万t/d项目实现了工程应用,测试结果表明槽内矿浆浓度分布均匀,悬浮能力好;气泡负载率超过了38g/L,矿化效果较好;取得了回收率90%的良好分选指标。

The self-aeration flotation cell has been used worldwide which could suck air and simplify the configuration of the flotation system. The relationship between kinetics performances, equipment’s structure parameters and operation parameters are more complicated compared with the air-forced flotation cell. The key kinetics performances of the largest self-aeration flotation cell in China are investigated by hydrodynamics test. It is demonstrated that the immersion depth of the impeller has the most significant influence on the suction flow rate. Next is the speed of the impeller. The insertion depth of the impeller and the speed have great impact on the circulation volume of the flotation cell. And the immersion depth has little influence on the circulation volume. The 320 m^3 flotation cell has been applied in the project of duobaoshan copper mine with 55 kt/d. The air dispersion of the flotation cell is very good with air dispersion grade up to 3. The mixing of the particles is also good with no density difference in the whole tank. The mineralization of the flotation is excellent with the bubble load rate exceed 38 g/L. The 320 m^3 flotation cell helps to achieve good separation index.