Cyclone group status
Writer： admin Time：2020-07-29 15:20 Browse：℃
What is the best condition of the cyclone composition level? When dealing with puree with a large sediment content, hydrocyclones are often connected in series to form a cyclone group for use. For the best condition in the working process, it should be sprayed in an umbrella shape.
Cyclone is often used in combination with a ball mill in a concentrator to form a closed loop to ensure the particle size of the grinding product. At the same time, by adjusting its structural parameters, the hydrocyclone can also be used for concentration, desliming and other operations. There are many parameters that affect the final classification effect in production practice, which makes it difficult for the selection plant to adjust the parameters of the hydrocyclone.
First of all, the structural parameters of the hydrocyclone have a great influence on the index of the final product. The structural parameters of the hydrocyclone include: mine opening diameter, cylindrical shell diameter, cone angle, overflow pipe insertion depth, cylinder height, etc. The cylinder diameter can be used to indicate the specifications of the hydrocyclone. It has a huge impact on the grading particle size. Generally, the coarse-grained grading adopts a large diameter, and vice versa. The cone angle is similar to the diameter. In addition to the structural parameters of the hydrocyclone, the feed concentration, feed pressure, feed mode and other factors also have a certain impact on the final classification effect. Generally, the grading concentration is high, the grading particle size is coarser, and the grading efficiency is low. The finer the grading particle size, the lower the ore concentration. The feed pressure mainly affects the processing capacity of the cyclone and has little effect on the classification particle size. The feed pressure increases, the slurry flow rate increases, the classification effect is improved, and the final sedimentation concentration increases. The feeding methods of hydrocyclones include three methods: gravity feeding, pressure-stabilizing tank feeding, and sand pump direct feeding. The feeding method mainly affects the feeding pressure and ultimately affects the classification effect.
In the classifying work of industrial production puree, when the cyclone unit is in good working condition, the sedimentation usually shows an umbrella blowout. And there will be a relatively small air suction hole in the center of the umbrella. When the air moves upwards, the pulp in the equipment will be discharged along the overflow pipe. As a result, the separation and classification efficiency of the cyclone group will be significantly improved.
But the angle of the umbrella structure in the equipment should not be too large. It is the most suitable state to be able to spread out a little. When the cyclone group is in the concentration work, the sediment can be discharged in a rope form, and the concentration of the sediment can reach the highest at this time. When dewatering, the sediment can be discharged in an umbrella-like structure at the maximum angle. At this time, the concentration of sediment will be reduced to the lowest state, and at the same time, more solids can be contained in the overflow. the amount.
Hydrocyclone is one of the commonly used grading equipment in ore dressing work. The following six factors affect the operation of cyclone:
(1) The diameter of the feed pipe affects the cyclone: ??the processing capacity, separation particle size and classification efficiency of the equipment are affected by the size of the feed port. The diameter of the feed port is often proportional to the diameter of the cyclone. Under normal circumstances, the cross-sectional shape of the mine mouth is rectangular, and the vertical cross-section is often tangential.
(2) The influence of the diameter of the overflow pipe on the operation of the cyclone: ??The proportional relationship between the size of the overflow pipe and the diameter of the cyclone is: dY = (0·2~0·4)D. If the diameter of the overflow pipe is increased, the overflow flow will increase, the overflow granularity will become coarser, the fine particle size in the sedimentation will decrease, and the sedimentation concentration will increase accordingly.
(3) The influence of the diameter of the grit port on the operation of the cyclone: ??the ratio of the diameter of the grit port to the diameter of the overflow port is often called the pyramid ratio. The pyramid ratio is an effective way to change the graded particle size. The grit port often increases the discharge port area due to wear, which increases the grit output and reduces the grit concentration. If the grit port is too small, coarse particles will accumulate on the top of the cone, which will cause the grit port to be blocked. The change in the size of the grit port has little effect on the processing capacity of the cyclone.
(4) The effect of cone angle on the work of cyclone: In general, a smaller cone angle is used for subdivision or dehydration; a large cone angle is used for coarse classification or concentration. The height of the cyclone cylinder is generally h (0.6~1.0)D. The insertion depth hy of the overflow pipe is (0·7~0·8)h. If it is too long or too short, it will cause the overflow and run thick.
(5) The influence of the feed pressure on the cyclone work: the feed pressure directly affects the processing capacity of the cyclone, but has a small effect on the graded particle size. In the daily production process, the use of higher pressure (150 ~ 300kPa) can obtain stable operation results, but it will cause serious wear of surrounding parts. The feeding method can be directly fed by a pressure regulator box or a sand pump. The latter is better in terms of energy saving and stable operation.
(6) The effect of the nature of the feed ore on the work of the cyclone: Under normal circumstances: the feed concentration is high, the classification particle size becomes coarser, and the classification efficiency also decreases. Therefore, when the grading particle size is 0·074mm, the ore concentration should be 10%-20%; when the grading particle size is 0·019mm, the ore concentration should be 5%~10%. The working state of the cyclone used for classification should be that the sand is sprayed out in an umbrella shape with a small air intake in the center of the umbrella.
