1. Equivalent diameter

2. Gravity separation

3. Separation size

4. Porosity

5. Equal settling ratio

6. Equal settlement phenomenon

7. Equal settling particles

8. Equal settling ratio

9. Significance of equal settling ratio

10. Factors influencing the equal settling ratio

    1 The influence of medium density: The equal settling ratio increases with the increase of the medium density.
  1. 2 The influence of equal settling velocity: The equal settling ratio is related to the resistance coefficient during the settlement of ore particles.
  2. 3 The influence of particle shape: The equal settling particles with different shapes have a large equal settling ratio.

11. Bed

12. Suction effect

13. Medium solid

14. Medium resistance

15. Free setting

16. Hindered settling

17. Types of hindered settling velocity

    1 The particles settle in particle groups of uniform density and particle size.
  1. 2 The particles settle in particle groups of the same size but different density.
  2. 3 The particles settle in particle groups of different sizes, densities and shapes.
  3. 4 Coarse particles settle in a finely dispersed suspension.

18. Is the hindered settling velocity less than the free settling velocity?

    1 When the particle settles, its relative velocity with the medium will increase, which leads to an increase in the resistance of the medium.
  1. 2 When the particle size is too wide, the buoyancy effect of the particle is greater than that of water.
  2. 3 The generation of mechanical resistance.
  3. 4 The viscosity of the medium increases. Due to the existence of particle clusters, the resistance to particle sedimentation will increase, so the hindered settling velocity is less than the free settling velocity.

19. Pressure resistance

20. Solid volume concentration

21. Classification size

22. Dense-media process

23. Dense-media ore dressing process

24. Judging whether the water flow characteristics of a jigging cycle are reasonable

    1 Whether it is beneficial for the bed to be loosened as soon as possible.
  1. 2 The effect of bed separation according to density.
  2. 3 The impact on suction effect according to the characteristics of different raw materials.

25. What are the factors influencing the jigging beneficiation process?

    1 The impact of stroke and jig frequency.
  1. 2 The influence of supplementary water under the sieve and the water to the mine.
  2. 3 The influence of bed thickness and artificial bed.
  3. 4 The influence of the properties and amount of the ore.

26. Hydraulic classification

27. Application of hydraulic classification in mineral processing

    1 Before some gravity separation operations (such as Crusher, Crusher, etc.), the selected raw materials are divided into narrow-grained grade.
  1. 2 It forms the closed-circuit work with the grinding operation and timely separates qualified particle size products to reduce overgrinding.
  2. 3 Desliming and dehydration of raw ores or separated products.
  3. 4 Determine the particle size composition of fine materials (mostly -0.075 mm), that is, conduct hydraulic analysis.

28. Hydraulic analysis (elutriation for short)

29. Locus of zero vertical velocity (LZVV)

30. Segregation phenomenon

31. Working principle of CrusherCrusher

32. The classification process of spiral classifier

33. What are the main factors affecting the process effect of the spiral classifier?

Density: The greater the density of the ore, the higher the production capacity (almost proportional).

Particle size composition and mud content: As the slurry viscosity increases, the settling rate of the ore particles decrease and the processing capacity and classification accuracy are reduced. Therefore, when the mud content is high, a lower classification concentration is often used, but this in turn leads to a reduction in capacity.

Classification area: It affects the processing capacity of the spiral classifier and determines the classification size. As the area of classifier increases, its processing capacity increases and the classification accuracy becomes finer.

The rotation speed of the spiral: The classification of coarse particles can be agitated greatly without affecting the settlement of particles. For fine particle classification, strong agitation should be avoided, and the spiral rotation speed is just sufficient to transport the returned sand along with the outer tank.

34. The classification principle of hydrocyclone

35. The working principle of the hydrocyclone

36. What are the factors influencing hydrocyclones?

    1 Diameter. The hydrocyclones with a larger diameter are often used for coarse classification; For fine classification, a small diameter cyclone is used.
  1. 2 The diameter of the feeding pipe. The size of the feeding port has a certain impact on the processing capacity, separation particle size and classification efficiency.
  2. 3 The diameter of the overflow pipe. If the diameter of the overflow pipe increases, the overflow flow increases, the overflow particle becomes coarser and the sand settling concentration increases.
  3. 4 The diameter of the apex diameter. The discharging area of the apex diameter often increases due to wear, so the settling sand yield increases with lower concentration.
  4. 5 The effect of the taper angle on the hydrocyclone. The smaller taper angle is used for fine classification or dehydration; the large taper angle for coarse grading or concentration.
  5. 6 The influence of feed pressure on the hydrocyclone. The feed pressure directly affects the processing capacity, but has little effect on the separation size.
  6. 7 The influence of the nature of the ore on the hydrocyclone. The higher the feed concentration, the coarser the grading particle size and the lower the grading efficiency.

37. The advantages, disadvantages and internal speed distribution of hydrocyclones

    1 Simple structure, light and flexible, no transmission parts.
  1. 2 Low equipment cost, easy disassembly and assembly, convenient maintenance, easy manufacturing, small floor space, low capital construction cost.
  2. 3 Fine classification size, especially for fine (<0.1 mm) materials.
  3. 4 High efficiency of classification, sometimes up to 80%.

    1 Fast wear.
  1. 2 The power consumption of the pump is large, so the maintenance cost is more.
  2. 3 It is difficult to determine and maintain its best working conditions because there are so many factors that affect the process effect of the cyclone.
  3. 4 The internal speed of the hydrocyclone is three-dimensional space velocity, namely tangential speed, radial velocity and axial velocity.