brief introduction

Heavy medium hydrocyclone is a kind of coal preparation equipment with simple structure, no moving parts and high separation efficiency. Because the hydrocyclone has no moving parts, the separation process is realized by the flexible cooperation of its own structural parameters and external operating parameters. This is a distinct feature of the separation method of hydrocyclone and other coal preparation methods.

working principle

In the process of separation of heavy medium hydrocyclones, the material and suspension are fed into the hydrocyclone with certain pressure along the tangent direction, forming a strong vortex flow; The liquid flow from the feed port forms a downward spiral flow along the inner wall of the hydrocyclone; A rising inner spiral flow is formed near the axis of the hydrocyclone; Air is drawn in because of the negative pressure of the inner spiral flow, and air column is formed in the axis of the hydrocyclone; The fine coal in the feed flows upward with the inner spiral, and it is discharged from the overflow port, the gangue flows down with the outer spiral and from the bottom flow port. The formation mechanism of air column is: because the bottom flow pipe and overflow pipe are directly connected with the atmosphere, the two-phase flow entering the hydrocyclone moves with strong spiral vortex. When the tangent velocity increases to the critical speed, certain resistance is generated at each outlet of the cyclone, forming the internal rotating flow field, leading to axial negative pressure, and the air enters the hydrocyclone through overflow pipe and bottom flow pipe, Under the joint action of axial negative pressure drive and fluid convection transmission, it gradually develops into a through air column. When the particle density is larger than the density of suspension, the resultant force of particles in the radius of R is positive, and the particles are thrown out of spiral flow; Otherwise, the particles are dumped into the inner spiral flow; Thus, the particles with density greater than the medium and those with density less than the medium are separated. In hydrocyclone, centrifugal force is several times to dozens times larger than gravity, so separation speed is greatly accelerated and separation effect is improved.

characteristic

Heavy medium hydrocyclone is a kind of separator which uses centrifugal force field which is more than dozens times or hundreds times of gravity to prepare coal. Its separation process is realized by the flexible cooperation of its own structural parameters and external operating parameters. This is a distinct feature of hydrocyclone coal preparation and other coal preparation methods. The characteristics of heavy medium coal preparation are as follows:

1. The separation efficiency is high. The separation efficiency of heavy medium hydrocyclone is * high in various gravity coal preparation methods.

2. The range of density adjustment is wide. The separation density of heavy medium coal preparation is generally 1300 kg/m3 ~ 2200 kg/m3, and it is easy to adjust, and its error can be kept at ± Within 0.5%.

3. It has strong adaptability and wide separation granularity. The particle size, quantity and quality of the heavy medium coal preparation can fluctuate greatly.

4. The production process is easy to realize automation. The density, liquid level, viscosity, magnetic content and other technological parameters of the suspension used in heavy medium coal preparation can be controlled automatically.