Design principle of beneficiation equipment technology
Classification is the process of dividing a group of particles into two or more particle size levels according to the different settling speeds of particles in a moving medium. It is generally applied to fine-grained materials. The movement forms of the medium in the classification equipment include vertical upward flow, approximately horizontal flow and rotary movement. The medium can be water or air. The classification using air as the medium is called wind classification.
When the material is classified in the rising water flow, the particles with the settling speed greater than the rising water flow speed will sink in the classification equipment and become the sedimentation product, and the particles with the settling speed less than the rising water flow speed will be carried out from the upper part of the classifier by the rising water flow. It becomes an overflow product; the particles whose sedimentation speed is equal to the ascending water flow speed theoretically have a distribution rate of 5000 each in the sedimentation and overflow. The particle size of such particles is called the separated particle size.
The sedimentation form of the particles in the classification equipment generally depends on the volume concentration of the particles in the equipment. The classification with the smaller volume concentration is the free sedimentation classification, and the classification with the larger volume concentration is the interference sedimentation classification. Since the interference sedimentation velocity of particles is lower than the free sedimentation velocity, the rising water flow required for interference sedimentation classification is less than that of free sedimentation classification, which can save water and obtain a larger concentration of sedimentation. The production capacity of the classification equipment is also improved. Be improved.
However, because the interference sedimentation ratio is greater than the free sedimentation ratio, during interference sedimentation classification, the sedimentation will contain more fine and heavy particles, which will affect the accuracy of the classification. Therefore, when the classification accuracy is required to be high, the interference sedimentation classification is not suitable. The accuracy of particle classification is not only affected by the size of the particles, but also by the density and shape of the particles.
2.The main applications of classification in the concentrator are:
(1) In the preparatory work before the reselection operation (such as a shaker), the raw materials are classified into candidates to reduce the impact of particle size on the selection process.
(2) Work with the grinding machine to control and check the particle size of the grinding products, to sort out qualified products for grinding in time, and to reduce over-crushing.
(3) Desliming or dehydrating raw ore or products.
(4) Divide the raw materials into products of different grades to suit different purposes.
3.classification equipment can be divided into the following categories:
(1) Hydraulic classifier, such as Yunxi type hydraulic classifier box, sieve plate type hydraulic classifier, etc. This type of classifier is mainly used for grading before reselection, and also used for desliming
(2) Mechanical classifiers, such as spiral classifiers. This type of classifier is mainly used for pre-classification, inspection classification and control classification during grinding, and is also used for desliming or dewatering.
(3) Centrifugal classifiers, such as hydrocyclones. It is mainly used for the classification, desliming and dehydration of fine-grained materials.
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