The silicon containing minerals in bauxite are very apt to be slimed so as to produce a large amount of secondary slime which can seriously affect the silicon removal in reverse flotation.

The process technology of the primary and secondary fine slime in Dajishan tungsten mine was transformed to improve the process technique.

For the manganese carbonate ore from Tongluojing Mine of Zunyi, there is little slime in the primary ore but much in the secondary ore.