ABSTRACT
The latest progress in the research of the coal slurry ash-content measurement makes it possible to automatically and effectively control the coal flotation. A quality monitoring and control system for the flotation circuit has been designed with the utilization of the multi-stream measurement system, the densimeter, the flowmeter and other sensors to measure the process parameters. The optimum control algorithm of this system combines the feed forward control with the feed back control. The former calculates the tonnage of coal in the feed which enters the flotation section, and adjusts, according to the reagent consumption per ton of coal, the reagent additions to the flotation feed. While the later further amends the reagent additions with the strategy of fuzzy logic control. The combination of these two kinds of control can increase the clean coal recovery and keep the reagent consumption in minimum, while ensuring the ash content of the concentrate within the required specification.
