Continuous segregation of binary heterogeneous solids (different density mixtures) is carried out in a gas–solid fluidized bed to study the effects of gas velocity, solids feed rate, feed composition and density difference of solids on the separation factor (recovery of flotsam at top outlet) and the quality of the product (purity of flotsam at top outlet) in a continuous fast-fluidized bed. The holdup of the bed material is obtained in each experimental run. It is observed that the separation factor decreases with increase in solids feed rate or density difference of solids, and increases with gas velocity or proportion of flotsam in the feed. The quality of the product decreases with increase in gas velocity or solids flow rate, and increases with feed composition or density difference of solids. The experimental results show that the separation factor and the quality of the product are more sensitive to gas velocity than to other operating parameters. Empirical correlations for predicting the separation factor and quality of the product are proposed based on the Richards model for individual flotsam mass fraction in the feed, and the predictions agree satisfactorily with the present experimental data.

在气固流化床中对二元非均质固体（不同密度的混合物）进行连续分离，以研究气体流速，固体进料速率，进料组成和固体密度差对分离因子的影响（顶部的浮选回收率）连续快速流化床中的产品质量（顶部出口的漂浮物纯度）。在每个实验运行中均获得床层材料的滞留量。观察到分离因子随固体进料速率或固体密度差的增加而降低，并随气体速度或进料中的漂浮物的比例而增加。产品质量随气体速度或固体流速的增加而降低，并随进料组成或固体密度的差异而增加。实验结果表明，分离因子和产品质量对气体速度的敏感性高于对其他操作参数的敏感性。基于Richards模型，针对饲料中的各个浮选质量分数，提出了用于预测产品分离因子和质量的经验相关性，并且该预测与当前的实验数据令人满意。