Flotation Column Liquid Level Control System Based On Fuzzy Controller Design And Research

Mineral processing industry, like other industries, is also facing various challenges in resources, environment and economy. This stern situation is closely related to its prosperity and decline. Dozens of years' theoretical research and industrial production practice prove that the column flotation is the effective equipment to concentrate and separate minerals and it is also a feasible way to enhance the separation efficiency in mineral processing, to raise the utilization efficiency of the recourses and to reduce the separation cost. It has a widespread use and a good prospect for development.This article summarizes the history and the current situation of the research on column flotation systematically and discusses the development tendency of column flotation.During the flotation , pulp fluid positions of the floatable processing equipment change frequently because of the changes in the nature of pulp and the undulating discharge. When the fluid position is too high, the concentrate blows too much and the grade reduces. But when the fluid position is too low, it can cause the concentrate yield to reduce, which also results in the reduction in the recovery. Obviously, controlling the pulp position of the column flotation is one of the important factors that influence the recovery and the grade of concentrate.According to the characteristics of the working process of the column flotation, The thesis proposes the indirect way to examine the real position of the column flotation by the ultrasonic position-transmitting instrument.By means of comparing PID control algorithm with fuzzy control algorithm, PLC controlling system with single-chip processor controlling system, and the actual situation of the column flotation, the way of controlling the position using single-chip processor to develop the fuzzy controller is finally adopted in this project .The MATLAB software' s fuzzy logic toolbox to establish the fuzzy reasoning system was used in the design of fuzzy controller. According to the fuzzy reasoning rule to deduce the fuzzy system, and then the fuzzy control questionnaire was obtained by the counter-fuzzy. Based on the fuzzy control questionnaire obtained, the entire control system programme was designed by language C. In fuzzy controller designing, the selection of m embership function and control rule are subjective and random, some parameters need to be modified over and over again. Genetic algorithm is introduced into the designing of fuzzy controller, which can solve the original drawbacks and make the designing more effectively.The liquid level control system has been able to confine the liquid level fluctuating within±4cm and to regulate the liquid level of the overflow automatically and steadily. The liquid level control system meets the design requirements and provides experiences and advice for the large-scale and industrialized column flotation equipment in the future.