1. What is the principle of hydraulic classification? What is the common hydraulic classifier? What size is suitable for grading?

The hydraulic classification is a mixture of mineral particles in water according to the sedimentation speed difference, and the mixed particle group with a wide particle size range is divided into a plurality of particle groups having a narrow particle size range. The classification process is based on their different speeds of movement in the water, where large, light and small and heavy ore particles have the same settling velocity and thus form a level of granularity. Therefore, the hydraulic classification is performed not only by the particle size but also by the specific gravity.

The equipment used for grading is called a classifier, and the commonly used hydraulic classifier is a box type hydraulic multi-chamber classifier, which is also called a mechanical concentrating groove classifier.

This classifier used in tungsten ore beneficiation plant, as the shaking of sorting before material classification. Suitable fractional particle sizes range from 2 to 3 mm, but are less effective for fractionation of less than 0.074 mm.

2 , the role and application of washing? What is the common washing equipment?

Washing is used to treat ore and useful minerals that are bonded to the clay . The ore washing process includes two stages of dispersing the clay and separating the separated clay material from the particulate material.

Usually washing process for iron ore clay, manganese ore containing gold, tin, tungsten, platinum, and other useful placer. It is also used to process sand and clay materials for construction.

In metal concentrators, washing is generally done as preparatory work, such as jigging, hand picking or washing before crushing.

Commonly used washing equipments include chutes, flat washing screens, cylindrical washing machines and trough washing machines. The CXK-160×763 tank type washing machine produced in China has a body size of 7630×1600 mm (inside length × inner width). The effect is better. When the ore particle size is less than 75 mm, the easy-washing ore production capacity can reach 70 tons/hour.

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