Journal of Kryvyi Rih National University

Abstract

It is noted that improvement of the strength and heat-resistant properties of the pelletized raw materials for metallurgical treatment can be achieved to a large extent by the mechanical activation of impurities in the pelletizing charge. In particular, for this purpose, it is possible to apply ultrasonic treatment of bentonites, which are widely used in the pelletizing charge during iron ore pellets production. The greatest effectiveness of the ultrasonic waves is achieved when they are transmitted to the object to be processed through a liquid medium. The water medium, which is used in most technological processes that require the use of liquids, proves to be the most economical and affordable. During the experiments, the water medium is treated with ultrasonic waves of two frequencies - 20 and 40 kHz and can be considered the most suitable for ultrasonic activation of bentonites. At the same time, the power of the ultrasonic wave generator varies within the range of 15 to 150 W. The dependency of the temperature of the water medium on the frequency of ultrasound and the power of the emitter is plotted. The intensity of ultrasonic waves, their amplitude and length are calculated depending on the power of the generator and the frequency of oscillations. The purpose of the work is to study the parameters of ultrasonic oscillations resulted from temperature changes during the treatment of a water medium as one of the possible liquid environments for ultrasonic treatment of loose materials with ultrasonic waves of various frequencies and power. Methods of scientific research. Experimental laboratory and theoretical general logical methods of scientific research are used in the work including analysis and synthesis, analogy, generalization. Scientific novelty of the work. Based on experiments of the ultrasonic treatment of water, the intensity, amplitude, and length of ultrasonic waves are determined for various frequencies and powers of emitter generators. The practical significance of the work consists in practical application of the results of calculations of the intensity and amplitude of ultrasonic oscillations, establishing their dependency on the power of the radiation source and the frequency of oscillations. The results of the work indicate that ultrasonic waves introduce a certain amount of energy into the environment, thus causing an increase in temperature, which is associated with a direct dependency on the change in the power of the radiation source

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Retrieved from Vol. 22, No. 1, 2024

Pages 64–70