Introduction. The article analyzes methods of capture of small particles in the process of purification of air and dust mixtures on the example of an enterprise for dolomite powder production. Due to the presence of cells in the tissue, bag filters do not capture particles less than 1 micron. Fractional analysis of the dolomite powder, producing by «Kavdolomit» JSC on Brookhaven XDC centrifuge, shows that the fraction less than 1 micron is contained in its amount of an average of 26%. The analysis was performed in the NCIMM (STU). This fraction is almost completely emitted to the atmosphere. In case of using the dolomite powder as a supplement in ration for domestic fowl and animals and in case of decreasing the size of particles, absorption of calcium and minerals increases. On this basis substantiated the prospects of using the wet method for catching fine particles (including nano), dust and gas emissions of mining and metallurgical complex with the use of patented jet bubblers.
Objectives of the study. As a result of preliminary calculations an experimental installation was developed in the laboratory of NCIMM (STU) during the design of industrial dust and gas collector. This installation is a fragment of dust and gas collector with the industrial dimensions of its parts and it is designed to study the processes of bubbling and dedusting. Objectives of the study: choice of optimal modes for the formation of bubbles, interaction of gasliquid jets and extraction of data, which is necessary for the design of a device. Constructive scheme of the installation and measuring devices are examined. A front wall of the installation is made of glass, which gives an opportunity to take photos and videos of bubbling processes. The experimental installation consists of a fan and a manometer for measuring air velocity in the delivery tube. Possibilities of variation of constructive and dynamic parameters are described. The article provides the methodology and execution plan of experiments with indication of measuring and variable parameters, as well as the results of preliminary experiments, which allow to establish a rational distance of caps from each other and air velocity in the feed pipe and slotted caps. As a result of a timelapse video processing of the bubbling were built graphs of bubbles diameter changes (d) to the height of emersion (h). According to the graphs on a computer the empirical dependence was obtained with the use of «Grapf 9» program. The rate of diameter change has increased with decreasing of bubbles size.
Conclusions. The results of the experiments will provide data to clarify design features and operational parameters of the developed jet bubbler, which is expected to be installed in the technological line of dust collectors of «Kavdolomit» JSC after the bag filters. Application of the developed bubbler system in the schemes of gas purification in mining and metallurgical complex of a foothill zone will allow to increase the degree of environmental protection around the respective territories of an enterprise and to reduce the loss of valuable products.
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)