Abstract: To solve the problems of fine tailings filtration for backfilling in Fankou Lead-zinc Mine, the hydrocyclone desliming tests on the tailings were carried out. The filtration performance of hydrocyclone grits was investigated through the laboratory vacuum filtration tests and the single filter plate tests with ceramic filter. The results showed that with the use of CZI 100 cyclone, a lot of -9.98 μm micro-fine particles in the fine tailings slimes can be removed in the right conditions, and the grits removal can meet the requirements of the concentration greater than 60% and the production rate greater than 40%. Good filtration performance of grits has been achieved. In the laboratory vacuum filtration test, the speed of filtrate was up to about 4 times as much as the feed of disc filter for in-site fine tailings. In single filter plate test with the ceramic filter, the filter cake moisture was reduced to 23% or less. 

Key words: Fine tailings for backfilling, Hydrocyclone desliming, Filtering