According to the spiral blade at the flooding end, there are two types:

1: high weir type: the top side of spiral blade is higher than the flooding level and the center of the blade is lower than the flooding level. This type is used for classifying ores with flooding size between 25-120mesh.

2: immersed weir type: the whole spiral blade is immersed in the flooding level at the flooding end. This type is used for classifying ores with flooding size between 120-200mesh.

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