Five Operation Modes of Hydrocyclone in The Process of Grinding And Grading

Date: 2021-05-26     From: Longding     Author: admin

Grinding and grading is a very critical step in the entire beneficiation process. How to improve efficiency and reduce energy consumption has become the core issue of grinding and classification. Hydrocyclones have excellent performance in operations such as pre-grading and overflow control grading. They have the characteristics of high grading efficiency, a small footprint, and low investment cost. Following are the five modes of hydro cyclone in the process of grinding and grading.

1. Pre-grading

Pre-grading is generally not used before the first stage of grinding. It is only used when the feed size is less than 6-8mm and the qualified product content in the feed is greater than 15%. The main function of pre-classification is to move out the impurities and large particles in the mineral materials, so as to increase the processing capacity of the ore mill, or to separate the secondary sludge for further processing.

2. Fully closed circuit grinding inspection and classification

The function of closed-circuit grinding inspection and classification is to control the particle size of the grinding products. The classification returns to the ore mill to increase the ore throughput per unit time of the ore mill and increase the production capacity of the ore mill. However, the cyclic load due to the returned sand will affect the production capacity of the grinding machine.

The inspection and classification in the first stage grinding and the second stage grinding can make the grinding machine work effectively, avoid over-grinding and meet the requirements of grinding fineness for the next stage of sorting operations. Therefore, it is necessary to check the graded work.

3. Overflow control classification

When performing stage selection, hydrocyclone classification, and when the coarse particles must be removed in the mechanical classifier first, the overflow control classification operation should be used.

4. Return sand control grading

The purpose of the returned sand control grading is to reduce the content of qualified products in the returned sand. A classifier can also be added.

5. Local grinding inspection and classification

The local closed-circuit grinding inspection classification is not only the inspection classification of the first stage grinding but also the pre-grading of the second stage grinding. The load of the second-stage grinder changes not through overflow, but through sand settling, so the load between the two-stage grinders is easy to distribute and adjust. However, the classification process also has drawbacks. One stage of classification removes a large amount of sludge, which greatly reduces the amount of sludge in the second stage of classification, reduces the viscosity of the slurry, and makes the classifier work unstable.