摘要
开展流化床中预处理难浸金精矿之前，需要进行冷模研究，为热态实验提供关键参数。以空气一水一高硫高砷金精矿为物系，采用实验研究和理论分析的方法，开展流化床中难浸金精矿最小流化速度、气含率、固含率、轴向压降等随操作条件的变化研究。研究发现：①平均气含率随气速的增大呈指数增加。②在初始阶段，随着气体流速的增加，两点间压降下降。上部压降最大，下部次之，中部最小。随着气体流速进一步增加，压降下降幅度略微降低。③在实验范围内，三相流化床内的平均气含率与气速的模型关联结果为εE=0.12E^0.99。
It is necessary to conduct cold simulation of pretreatment of refractory gold concentrate （RGC） in there-phase fluidized bed, providing key parameters of subsequent hot experiments. Air, water and HGC were used as gas phase, liquid phase and solid phase, respectively. Through theoretical analysis artd experimental study, hydrodynamics in three-phase circulated fluidized were studied. The effects of op- eration conditions on the flow Characteristics were conducted. （1） average gas holdup increased with gas ve- locity exponentially; liquid circulation velocity increased with gas velocity, and gas-liquid mass transfer mainly occurred in the upper tube; average gas holdup increased with amount of solid particles. （2） At the initial stage, with the increase in gas flow rate, pressure drop between two points dropped. The pressure drop of upper part is the largest, the lower part is the second, the central is minimum. With a further in- crease in gas flow rate, pressure drop slightly decrease. （3） Under the experimental condition, the correlation of average gas holdup in circulating fluidized bed ise, εE=0.12E^0.99.
出处
《中国矿业》
北大核心
2011年第4期85-88,共4页
China Mining Magazine
基金
国家863项目(编号:2006AA06Z132)
关键词
三相流化床
预处理
金精矿
冷模
three-phase fluidized bed
pretreatment gold concentrate
cold simulation
