Abstract: The dust from crushing workshop of a mine in humid climate area of Southern China is highly humid and highly viscous.The traditional wet dust collection processing has feature of huge investment，high energy consumption，and large difficulty in operation and maintenance.Also，it only considers the dust removal，and fails to recover valuable materials，even increases costs in secondary pollution treatment，resulting in serious waste of resources.The traditional dry bag dust removal process need to paste bags，leading to be difficult in cleaning the dust，so it is not suitable for highly humid and highly viscous dust purification.Aiming at the existing drawbacks above，the dry bag dust collection process is adopted to purify the highly humid and highly viscous dust，which breaks through the technical bottleneck of the traditional dry bag dust removal technology.The new waterproof and anti-oil filter is developed to find an effective solution in cleaning dust which are not solved by pasting bag for high humid and high viscous dust.The chute and pump are used to realize cyclic utilization of collected duct and recover valuable metals，which not only reduces the costs in secondary pollution treatment，but also brings handsome economic benefits.Therefore，a new breakthrough is achieved in the field of dust removal.

Key words: Large crushing system, Highly viscous valuable dust, Dry recycling technology, Waterproof anti-oil filter material