Distributions of Size, Ash, and Density of Coal Particles Along the Front Discharge Section of a Compound Dry Separator

作者：Ling, Xiangyang; He, Yaqun^*; Zhao, Yuemin^*; Li, Gongmin; Wang, Jie; Wen, Baofeng

来源：International Journal of Coal Preparation and Utilization, 2018, 38(8): 422-432.

DOI：10.1080/19392699.2016.1278214

• Compound dry separator
• coal
• ash
• density
• size fraction
• separation efficiency

Compound dry separator has been widely used for coal preparation in China. This work discusses the distribution of coal properties along the front discharge section based on pilot-scale experiments. Six sampling splits were arranged in the front discharge section and three final products were obtained. Based on sieve and float-sink tests of sampled materials, distributions of size, ash, and density were investigated. During the separating process, fine particles are much easier to be discharged at first and coarse particles mainly concentrate in clean coal and tailings. Hence, the content of fine particles in raw coal has an important influence on clean coal. The high-density minerals in clean coal are mainly derived from -6+0.5 mm fine gangue, which cannot be separated effectively. The low and high separation densities of -6+0.5 mm fine coal were much higher than those of -50+6 mm coarse coal at the same operating conditions. Moreover, the middlings obtained in compound dry separator can also be cycled into separator.

• 出版日期2018-11-17
• 单位中国矿业大学（北京）