Gold_placer_employmentConcentrator is used in the composition of the same closed-circuit grinding machine work classifier, grit needed to enhance the transport organization, so this type of classifier is known as mechanical grading machine, in fact, the process is still graded by particle deposition carried out at different speeds. Mechanical grading machine in addition to the main auxiliary equipment as grinding and pre-grading inspection classification, but also sometimes used for washing ore with clay and mud off of pulp for dehydration. According to different forms of transport grit body, mechanical grading machine can be divided into spiral classifier, rake classifier and the classification of floating slot machine. One spiral grader made simple, easy to operate, grading trough with a large tilt angle, easy to make gravity the same mill connection, it is more common applications.

Spiral classifier is a rectangular shape of the chute, bottom angle is 12. ~ 18.5. , The bottom of the semicircle. Tank equipped with one or two vertical long axis, placed along the axial length of a continuous spiral blade. Transmission mechanism driven by the top screw axis. Such as a double helix, spiral blade from the upper point of view are turning out. Lateral to the pulp into the slot. Formed in the lower part of the settlement trough grade surface. Coarse particles sink to the bottom and then screw into the top of the discharge is in the transport process and the dehydration. Less than the settlement of fine particles are carried by surface flow of the slurry overflow weir discharge. Classification process and in the sub-soil in the same bucket. Slot in the bottom of a hierarchical framework. Framework of the upper beam with lifting equipment, to adjust the blade from the bottom of the spiral spin distance, and stop when the screw axis in the lift to prevent the ore deposits buried spiral blade. Spiral classifier hierarchical level surface can be divided into high weir and submerged (or sinking) two.

Allow classification of high weir overflow weir above the bottom of the machine screw axis of the center, below the upper edge of the helical blade. Classification is not the length of liquid, the liquid can be directly felt the stirring effect on the helical blade, it is used for coarse-level classification, grading granularity than in 0. 15 non more. Immersion of the bottom of the spiral blade grader completely immersed in the liquid level below grade area but stable, suitable for fine-level classification, grading particle size 0.15 non less. Overflow its higher productivity. There is also a low weir spiral classifier, the classification of the bearing surface below the bottom of the spiral, the liquid is very small, stirring effect, and is mainly used for washing the ore mud.

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