What is the basis for judging the flotation quality of coarse particle flotation machine?

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Although flotation equipment exists in various forms, judging from the characteristics of solid-liquid suspension, the purpose of stirring in flotation equipment is mainly twofold. Two: First, the solid particles are completely suspended from the bottom of the tank, which is referred to as complete suspension from the bottom; second, the solid particles are evenly suspended in the tank, which is referred to as uniform suspension.

Aiming at the two different purposes of solid-liquid suspension, two basis for judging the state of solid-liquid suspension are proposed.

1. Use the amount of unsuspended solids at the bottom of the tank as a criterion

If the solid particles stay at the bottom of the tank for no more than 1 to 2 seconds, it is considered to be completely suspended from the bottom and can meet the requirements The lowest stirring speed under this condition is called the critical speed for complete off-bottom suspension, represented by Nc. When complete off-bottom suspension is achieved, the solid content everywhere in the tank is not completely uniform. This criterion can be used to make a qualitative analysis of the suspension state of mineral particles in the flotation tank. The picture below shows the changes in the suspension state of particles in the tank as the rotation speed of the stirring mechanism gradually increases.

2. Speed criterion

Since the solid particles in the center of the tank bottom are the last part to be suspended, Therefore, examining the changes in the speed of the solid particles in this part at different stirring speeds can also be used as a criterion for whether the particles are completely suspended. When complete suspension is not achieved, the movement speed of the particles in these parts changes very little; when the particles are completely suspended, the speed of the particles changes greatly with the change of the stirring speed.

Due to the limitations of laboratory conditions, this article analyzes the suspension situation by measuring the deposition of mineral particles at the bottom of the impeller in the flotation tank, thereby determining the critical speed at which the mineral particles are completely suspended from the bottom. The height from the interface of the upper and lower circulation channels to the bottom of the tank and the height of the transport zone of mineral particles are used to determine the recovery effect of coarse-grained minerals.