基于总体平衡模型的给料粒度分布对球磨机磨矿速率的影响研究

Study on the Influence of Feed Particle Size Distribution on Grinding Rate of Ball Mill Based on the Population Balance Model

以给矿粒度为切入点,通过设置四组单一粒度和两组双粒度给料,讨论给料粒度分布对磨矿速率的影响。研究结果表明,试验中破碎粒度累积分布可以归一化,且与物料粒度分布无关,只与粒度的比值有关。给矿为单一粒度时,粒度越大,磨矿速率越快,磨矿过程中随着细粒度的产生,产品中较粗粒度的生成速率增加,细粒度与之相反;双粒度磨矿过程中,产品中大部分粒度生成速率增加,0.3mm以下粒度的生成速率增加较快,平均粒度相同的双粒度和单一粒度在磨矿过程中,双粒度产品的生成速率几乎都高于单一粒度。

Taking the feed particle size as the entry point, the influence of particle size distribution on grinding rate was dis- cussed by setting four sets of single particle size and two sets of double particle size. The results showed that the cumulative distribution of crushing size could be normalized in this experiment, and was independent of the particle size distribution, but only depended on the ratio of grain size. When the ore was fed with a single particle size, the larger the size, the faster the grinding rate. In this grinding process, with fine granularity, the formation rate of products in the coarse grain size increased~ but that in the fine grain size was on the contrary. In the grinding process with double particle size, the formation rate of prod- ucts in most sizes increased, especially in the particle size less than 0.3 ram.With the same average size, the formation rates of double-particle-size products were almost higher than that of single-particle-size products in the grinding process.