The results of laboratory studies of the composition and structure of microspheres of ash and slag wastes of Russian Far East energy enterprises (in particular, CHPP-2, Vladivostok) are presented in this scientific work. It has been established that the microspheres are concentrated in particles of technogenic wastes with a size of up to 500 μm, with the prevailing mass of valuable geomaterial (75-80 %) being in narrow granulometric classes from 71 to 100 μm and 100 to 200 μm. Part of the microspheres is represented by unusual techogenic metal alloys (for example, antimony with aluminium), has a density of more than 1g/cm3, and when wet enriched in water precipitates. From a practical point of view, the investigated microspheres cannot be considered a ready commercial product, since they contain a significant amount of carbon concentrate, which is unburned solid fuel particles. In this connection, it is required to develop effective technological solutions for the extraction and purification of microspheres from ash and slag wastes from the thermal power industry of the Far East of the Russian Federation.

The possibility of extracting iron oxides from ash and slag wastes of the Primorskaya GRES power plant - (Luchegorsk, Primorsky Kray) was investigated. The positive influence of the energy of ultrasonic vibrations with frequency of 22 kHz and power at1 kW, on the increase in the percentage of extraction of iron from ash and slag waste from thermal power is presented. The optimal time of exposure to ultrasound radiation on ash and slag pulp is determined. A comparison of the magnetic separation of ash and slag waste (ASW) without additional grinding with magnetic separation with preliminary grinding of sample materials down to 90 and 40 microns is carried out. The positive effect of preliminary grinding of the ASW sample on the efficiency of the subsequent magnetic separation is presented. With double magnetic separation of the ASW sample in a magnetic field of 300 T and preliminary crushing of the sample to a particle size class of less than 40 microns, a concentrate was obtained with an iron oxide content of 52.9; the extraction rate of iron oxides equaled 84.2%.

This article addresses the issues of estimating economic benefits of ash and slag resource potential in Primorsky Krai on the example of CHPP-2, Vladivostok. The conducted research focused on chemical and ultimate composition of ash and slag waste (ASW) of heat power plants of Primorsky Krai. The research objectives were to determine the commercially valuable components and opportunities for their conversion into saleable products. The resource potential of Vladivostok CHPP-2 landfill was determined. Estimates on economic benefits of ASW conversion process were obtained.

In the research paper a computer model of the operation of a vibrational concentrator used to separate the slurry into individual fractions of a grain size by depositing particles of specified characteristics in the field of centrifugal forces is created and verified using the methods of computational hydrodynamics with the Ansys software complex. Using the model will make it possible to: 1) to study the operation of concentrators of various sizes and designs under different operating conditions, with a change in hydraulic characteristics (speed of treated liquid, speed of rotation of the bowl); 2) in the future study the problems of depositing suspended particles of specified characteristics (density, size) in a centrifugal field and determine the concentration of the sediment in the treatment process. The results of the work will make it possible to increase the efficiency of the enrichment of ash and slag waste due to a more thorough understanding of interaction mechanisms between the centrifugal concentrator and the enriched geomaterial.