Abstract: The concentrator process water includes thickening recycling water, static pressure return-water of tailing reservoir and clear water supplement, and the principle for using water is to use more return-water from the tailing reservoir and less clear water, and to realize a zero discharge. In the practice, as the tailing reservoir is generally far away, and the process needed water and the recycling water are instable, it is hard to both satisfy the requirement of process water and realize a zero discharge with the conventional automatic control. Therefore, an expert system based on fuzzy control theory was designed, which makes the judgement and forecast of the water level change of the recycling water tank and the emergency tank by a combination of advanced fuzzy control theory and the empirical method, and adjusts the static pressure return-water control valve based on the forecast result, so as to control the emergency tank level within a rational scope under the prerequisite of ensuring the concentrator's process water, and to realize a real zero discharge, thus reducing the environment pollution and producing great economic and social benefits.

Key words: Recycling water, Static pressure water, Fuzzy controller