深锥浓密机底流浓度模型及动态压密机理分析

泥层高度和底流浓度是深锥浓密机最为重要的两个参数,因此有必要研究底流浓度随泥层高度的变化规律.采用自制小型深锥浓密机,对尾矿非连续/连续动态压密过程进行了物理实验;借助于有效孔隙比与泥层压强间遵循的Power函数关系,结合对尾矿颗粒的受力分析,推导出了底流浓度与泥层高度的数学模型,揭示了浓密机底流浓度与泥层高度的内在关系,并从尾矿颗粒空间结构的角度解释了该模型的变化规律;结合矿山生产对于底流浓度的要求,应用该数学模型,为其推荐了泥层高度的合理范围,验证了底流浓度数学模型的可靠性.该模型为深锥浓密机的设计和运行提供了理论依据.

Mathematical modelling of underflow concentration in a deep cone thickener and analysis of the dynamic compaction mechanism

The sludge height and underflow rate are the two most important parameters for deep cone thickeners. Therefore, stud-ying the law of change of the underflow concentration with sludge height is important. Discontinuous or continuous dynamic compaction processes of the tailings were investigated physically by using a small, self-made deep cone thickener. Using the power function relation between effective void ratio and mud pressure and combining with force analyses of the tailing particles, this study deduced a mathemat-ical model of underflow concentration and sludge height. The results revealed the inner floc structure relation between underflow con-centration and sludge height of the deep cone thickener. In addition, the law of change of this model was explained by applying a spa-tial structure theory of tailings particles. Based on the requirements for the underflow concentration of mine production, the mathemati-cal model was applied, the reasonable range of sludge height was presented, and the reliability of this model was verified. Moreover, this mathematical model provides a theoretical basis for the design and operation of deep-cone thickeners.