Precipitation concentration is the dehydration process in which the ore particles are deposited from the slurry by their own gravity. During the precipitation process, the ore particles settle according to the laws governing the movement of solids in the medium. In a very short period of time after the initial settlement, the ore particles settle down with acceleration. After that, due to the resistance of the medium, the ore particles gradually balance with the gravity of the ore particles, and the ore particles gradually move at a constant speed. This speed is called the final velocity of sedimentation. In the pulp, the size of the ore group is not uniform, and the purpose of sedimentation is to hope that all the ore particles are settled to obtain a clear liquid, so the sedimentation end velocity of the ore particles must be calculated according to the minimum particle sedimentation end velocity.
The sedimentation velocity affecting the ore particles is mainly related to the following factors: size, density, shape, medium viscosity, medium density, etc. of the ore particles. The particle size of the ore particles has the greatest influence on the final velocity of the sedimentation, because it is proportional to the square of the particle size, so the finer the ore particles, the slower the sedimentation rate. Therefore, in the sedimentation process, the most difficult to settle is the fine slime. The more mud in the pulp, the more difficult it is to clarify, and it is often suspended in the pulp. The main reason is that there are double layers on the fine surface. With the same-sex charge, mutual exclusion, due to the movement of the Brown, the sedimentation of fine ore particles tends to be balanced. In the production practice, in order to accelerate the sedimentation of the fine ore particles, a certain coagulant may be added to the slurry to improve the precipitation concentration effect of the fine ore particles.
In addition, the lower the concentration of the slurry, the smaller the density of the medium, and the mutual interference of the ore particles is also small, so it is advantageous for sedimentation of the particles. It can be seen that the lower the concentration of the slurry, the better the sedimentation.
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