The extension operation plays an important role in the grinding cycle. Because the useful minerals of fine-grained inlays are to be dissociated and sorted, the ore must be ground to a certain degree of fineness. However, it is necessary to avoid over-grinding and prevent the adverse effects of muddy on the sorting process. This requires that the part of the grinding product that is qualified in the fine-grained product be separated in time to avoid unnecessary grinding and early delivery to the sorting operation. Failure to return to the mill and then grinding. It can be seen that the closed-circuit grinding cycle with grading operations is very significant both technically and economically. Currently in mineral processing plant in grading operations are widely used. 2. What is the classification process and principle? The mixture of different particle sizes is different in sedimentation speed in water, and the process of dividing into several levels is called hydraulic classification. For the ore particles with the same specific gravity, the sedimentation speed with large particle size is fast, and the sedimentation speed with small particle size is slow. Therefore, it can be divided into different particle size levels according to different sedimentation of the ore. Depending on the rate at which the material settles in the liquid medium, the machine that divides the material into several grades by size is called a classifier. The settled coarse fraction is called grit and is discharged by mechanical means (spiral or tweezers). The suspended fine fraction is called overflow and is discharged by water flow. 3. How many types of mechanical classifiers are there? Which is commonly used? According to its structural characteristics, it can be divided into three types: spiral classifier, rake classifier and suspension tank classifier. Among the three mechanical classifiers, the latter two types of mechanical classifiers have been gradually eliminated in production mines and can only be seen in individual old plants. In the grinding cycle, a hydrocyclone is also widely used as a classification device . The device is outlined in the second section. 4. What are the spiral classifiers? What is the difference? According to the position of the spiral in the groove and the height of the slurry surface, it can be three types: low-lying type, high-lying type and submerged type. The difference is: Low — - overflow å ° is lower than the spiral axis of the spiral. Due to the small area of ​​the sedimentation area, the classifier is only used for rinsing the sand containing less mud and the dehydration of rough gifts, which is rarely used in the grinding cycle. The sorghum type - the weir is higher than the axis of rotation of the helix, but lower than the upper edge of the helix of the overflow end. The classifier has a lower area of ​​the settling zone and a larger å ° type, and the height of the settling zone can be adjusted within a certain range, that is, the area of ​​the settling zone can be adjusted and changed within a certain range, thereby adjusting the granularity of the classification, which is in the grinding cycle. A commonly used device. Submerged—There are 4-5 spiral leaves at the end of the overflow, all of which sink in the slurry. The area of ​​the sedimentation zone of the classifier is large, the classification tank is deep, and the agitation of the spiral has little influence on the surface of the slurry. Therefore, the graded surface is stable and the overflow is large and thin. It is often used as a grading equipment for fine grinding or two-stage grinding in the production of the factory.
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Hierarchical knowledge
1, grading operations in the significance of what is grinding cycle?