Science and technics

Mining: Publications in Journal of Mining Institute.

MINING Dmitrii Sidorov, Doctor of Engineering Sciences, Professor, Saint-Petersburg Mining University, Russian Federation; Marina Potapchuk, Candidate of Engineering Sciences, Senior Researcher, Institute of Mining of the Far Eastern Branch of the Russian Academy of Sciences, Russian Federation;

In the Egypt’s Eastern Desert intrusive rocks with U-REE mineralization (two-mica granites, microgranites, dolerites, and bostonites) are developed. We estimated the content of chemical elements in reference samples of intrusive rocks and also in their water-soluble (colloid-salt) fraction. This fraction is water-extracted from the rock under certain conditions. The rock sample and its colloid-salt fraction are analyzed using ICP-MS. The chemical characteristic of the extracted fraction reflects the mobile migrating part of the chemical elements in the composition of the rocks. Comparison of the obtained data allows us to estimate the share of migrating and weakly migrating elements.

Geoecology and occupational health and safety: Publications in Journal of Mining Institute.

Electromechanics and mechanical engineering: Publications in Journal of Mining Institute.

Metallurgy and mineral processing: Publications in Journal of Mining Institute.

Oil and gas engineering: Publications in Journal of Mining Institute.

Geology: Publications in Journal of Mining Institute.

Publications:

In Polish mining for backfilling the fly ash mixtures are used. Last time for fly ash mixtures preparation the saline water from mine have been used, to thanks to that the saline water missing the surface waters. Usage of saline water for fly ash mixture preparation causes the changes in energy looses during the flow in pipelines. The paper presents the results of energy looses measurement іn laboratory pipeline installation with diameter D =50 mm. The measurements have been performed for different fly ash – saline water proportions. Tested fly-ash from Siersza power plant has typical properties (grain size distribution curve, density) for ashes used for backfilling mixtures preparation. Increase of fluid (water) salinity modifies fluid viscosity. Brine in comparison with pure water retains as liquid with increased viscosity. Increased viscosity can influence on the mixture ash-brine properties for example causing flocculation effect. Also changeable salinity has an influence on proper determination of resistance (frictional) coefficient λ during mixtures flow in pipelines because it depends on Reynolds number which depends on liquid viscosity. Increase of fly-ash concentrations in fly-ash – brine mixtures cause increase of energy losses.