Flotation Process Optimization Using High-Energy Ultrasound Frequency Control

The paper describes a method, which allows controlling the composition of iron ore pulp solid and gas phases and forming the desired gas bubble size distribution function, which corresponds to the pulp solid particle size distribution in the flotation process using high-energy ultrasound of a given frequency. To form an automatic control of the ultrasound exposure frequency, the algorithm, which automatically corrects the combinations of the output frequencies of the inverter voltage depending on the direction of the effective values of the current and the frequency of the output voltage is used. This allows adjusting the voltage-controlled oscillator to the resonant frequency of the converter. The control system is based on measuring the effective value of the current of the voltage generator, which is tuning the frequency of the voltage-controlled oscillator, which is generating a rectangular voltage wave with a fixed maximum value, which displays the output voltage of the inverter. To simplify the calculations, an adaptive fuzzy controller was used in the model of the digital frequency control system.