| Annotation |
The work is devoted to the development of a system for monitoring the parameters
of the ore pulp in the process of ultrasonic treatment. The aim of the work is to
analyze the changes in the physical, physic-chemical properties of ore pulps, their liquid
phases in the process of ultrasonic treatment and to develop a system for monitoring
their parameters for a laboratory ultrasonic reactor. A review of literary sources has
shown that under the action of ultrasonic radiation in liquid media of ore pulps, a whole
complex of physical, physico-chemical and chemical processes occurs that change
their properties. An analysis of changes in the physical, physico-chemical properties
of ore pulps, their liquid phases, during ultrasonic treatment has shown an increase in temperature, which reduces the intensity of cavitation by 20–30 times, an increase in
the pH value by 4–5 % for water, by 7.9 % coal pulp and by 3.37–4.5 % for suspensions
(frequency 20 kHz), an increase in the value of the redox potential in the first
6‒8 minutes by 24 %, an increase in the value of electrical conductivity during the first
5–6 minutes by 8–8.5 % and electrode potential by 13.6–16.6 %. However, the values
of dynamic viscosity decreased, especially intensively (by a factor of 4) during the
first 300 s of the treatment. With an increase in the radiation frequency to 1 MHz, the
values of the hydrogen index fell. On the basis of these studies, a scheme of the pulp
parameters control system has been developed. To control the parameters, devices
were used ‒ a pH meter brand pH-150 MI, with a measurement error in determining
the pH value of ± 0.05, in determining the values of the redox potential ± 3 mV, a
conductometer RS 100 with an error of ± 2 full scale. An SV-10 vibroviscometer with
a measurement accuracy of ±3 % (from 1 to 1000 mPa s) and an IRT-4/16 temperature
meter with an indication resolution of 0.1°C, with a reduced measurement error
of ±0.25 % were also used. The study of ultrasonic treatment of ore pulps is of great
interest and requires further experimental studies. |
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