进气速度与质量流率对多密度颗粒分离性能的影响研究

通过建立多密度颗粒在康达效应下的分离模型,利用不同密度颗粒在康达壁附近迁移轨迹不同而实现不同颗粒间的分离。基于计算颗粒流体力学(CPFD)方法模拟混合颗粒在该模型下的流动迁移特征,反映出不同密度颗粒在不同进气速度与质量流率的分离特性。研究表明,进气速度与质量流率对不同密度颗粒在康达壁下的迁移轨迹及分布均具有重要影响,当气流速度为2.8m/s,质量流率为10g/s时,在420-480mm区间,矿粒铜的回收率可达65%,品位可达78%,富集比可达9.75,在480-520mm区间,矿粒钨回收率可达59.50%,品位可达72%,富集比可达18,说明在康达效应下可以有效的分选富集高密度金属矿粒铜和钨,对多密度颗粒的分选具有借鉴作用,同时可为我国西北水资源贫乏地区金属矿的分选提供新的思路。

Study on the influence of inlet velocity and mass flow rate on the separation performance of multi-density particles

By establishing the separation model of multi-density particles under the Coanda effect, the separation of different density particles can be realized by using the different migration trajectories of particles with different densities near the Coanda wall. Based on the computational particle hydrodynamics (CPFD) method, the flow and migration characteristics of mixed particles in this model are simulated, which reflects the separation characteristics of particles with different densities at different inlet velocities and mass flow rates. The results show that: the air inlet velocity and mass flow rate have an important influence on the separation of particles with different density under the Coanda wall. When the air flow rate is 2.8m/s and the mass flow rate is 10g / s, In the range of 420-480mm, the recovery rate of copper particles can reach 65%, the grade can reach 78%, and the enrichment ratio can reach 9.75. In the range of 480-520mm, the recovery rate of tungsten can reach 59.5%, the grade can reach 72%, and the enrichment ratio can reach 18 Under the Coanda effect, different density particles can be effectively separated and enriched, which has a reference and guidance role for the separation of multi density particles.