Mill For Fine Grinding

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Fine Grinding Mill grinding kinetics

The evaluation criteria of grinding effect generally include three aspects: unit energy consumption, new qualified granular product content and grinding efficiency. Grinding efficiency is an indicator for evaluating the energy consumption of grinding, which can be expressed by the electrical energy required to process the unit ore. The relationship between the diameter of different media and the speed of the Fine Grinding Mill and the content of the new grinding fraction was studied.

The new fractional content increases as the rotational speed of the Fine Grinding Mill increases. The grinding medium of different diameters has different content of new grades. When the running frequency of the motor is 30, 35 Hz, the content of new-325 mesh is more when the medium diameter is 7 mm; the new-120 mesh when the medium diameter is 10 mm. The content of the grade is relatively large; when the medium diameter is 13 mm, the content of the new-200 mesh is higher. It can be seen that when the grinding product has a fine particle size requirement, a small diameter grinding medium is suitable.

When the motor frequency of the Fine Grinding Mill is increased from 25 Hz to 30 Hz, the new-grained content is greatly increased, and the increase of the motor frequency continues to increase the rate of increase of the new-grained content; therefore, the Fine Grinding Mill must be at a suitable rotational speed. Operation can produce higher grinding efficiency.

The finer the particle size of the grinding product, the higher the unit energy consumption required. When the Fine Grinding Mill is running at low speed, the new fractional unit energy consumption decreases as the medium diameter increases; when the motor frequency is 30 and 35 Hz, the new-325 mesh fractional unit energy consumption increases with the medium diameter. Slightly increased. When the medium diameter is 7mm, the unit energy consumption is low; when the medium diameter is 10mm, the energy consumption of the new-120 mesh fractional unit is low. Therefore, the grinding medium of the Fine Grinding Mill is mainly 7 mm, and a medium of 10 mm is appropriately added according to the product grain size requirement of the ore.

The energy consumption of the new-grain-scale unit decreases with the increase of the motor frequency of the Fine Grinding Mill. The finer the particle size, the higher the energy consumption of the grinding, and the decrease of the energy consumption of the new-scale unit is increased as the particle size becomes finer. Big. It can be seen that the Fine Grinding Mill is more suitable for fine-grained grinding. The finer the particle size under the same conditions, the more significant the energy saving effect. When the running frequency of the motor is increased from 30 Hz to 35 Hz, the energy consumption reduction rate of the new-grain-level unit is obviously smaller, and at 35 Hz, the slurry fluctuation in the Fine Grinding Mill cylinder is more severe, and it is impossible to form a stable self-grading area, which is easy to cause Over-grinding and under-grinding occur; therefore, in order to facilitate the experimental study to obtain a qualified overflow product, a motor frequency of 30 Hz (rotation speed of 204.8 r/min) should be used as the operating speed of the Fine Grinding Mill.

In summary, the quartz sand is used as the raw material for the grinding test. When the diameter of the grinding medium is 7 mm, the content of the new-325 mesh is higher, and the energy consumption of the new granular unit is lower. The operating frequency of the Fine Grinding Mill motor is At 30 Hz, the new fractional unit consumes less energy and is easy to obtain a qualified overflow product. Therefore, the grinding test of the Fine Grinding Mill mainly adds a grinding medium with a medium diameter of 7 mm, and the motor running frequency is set to 30 Hz.

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