可见，干涉沉降过程比自由沉降复杂得多。重选实践中所有沉降均为干涉沉降，但当粒群中颗粒之间的距离较大，也就是容积浓度(矿粒所占的总体积与悬浮体总容积之比)很小时(一般小于3%)，矿粒之间的干涉作用变得很弱，此时可视为自由沉降。

Obviously, the interference of the settlement process is much more complex than that of free settlement. Gravity concentration practice in all settlements for interference settling, but when the distance between particles in a particle swarm is larger, also is the ratio of volume concentration (mineral particles accounted for the total volume of the suspension and the total volume is very small (usually less than 3%), the interference between mineral grains become very weak, then regarded as free settling.