Technological Schemes for Preparation and Deep Beneficiation of Technogenic Waste Containing Fine Slimes Environmental Component

This article evaluates a new procedure for choosing special methods of disintegration for technogenic rock materials with fines and slimes. The article describe different examples of beneficiation technology for chromium-containing slime tails of the Donskoy beneficiation plant (Republic of Kazakhstan), hematite tails of Magnitogorskiy Metallurgical Plant, and tin waste with fines particles. Keywords: fine slimes, environmental component, technological schemes, Preparation technogenic waste

Destoning the Moatize Coal Seam, Mozambique, by Dry Jigging

This paper proposes pre-beneficiation studies by air jigs of the coal layers from a Moatize coal deposit. Pre-beneficiation, also called destoning, removes tailings before the beneficiation plant. The air jigs operate in the same granulometric size range as the heavy-media cyclones (HMCs) that are installed in the preparation plant. With the destoning, the heavy-media circuit operates with a lower coal feed and higher organic matter contents, increasing its cutting efficiency and lowering operational costs. The use of air jigs reduces the total water consumption in the plant, which is especially important for the region where the plant is installed, as water is particularly scarce. Four coal layers of the Moatize coal deposit were studied, which are currently exploited in the mine. As main results of the study, it is possible to say that the concentration of lights (feed of the preparation plant) and heavies (waste fraction) in air jigs can be carried out with reasonable efficiencies for all coal layers studied, making air jigs a feasible option for coal destoning.

MORPHOLOGICAL CHARACTERISTICS OF MAGNETITE AND QUARTZ IN THE PRODUCTIVE STRATA OF NORTHERN DISTRICT OF KRYVYI RIH BASIN

Currently, the main task for the geological service of Hannivka deposit of the Northern Ore Mining and Processing Works is to ensure the Ore Mining and Processing Works with raw materials, which allows receiving high-quality iron ore concentrate that meets the requirements of the world market. It is only possible to meet this challenge taking into account the morphological features of the main rock-forming minerals, and as a consequence, the natural capabilities of the ores, their dressability by increasing the efficiency of the blending ores of various mineral varieties and of different technological potential, in order to achieve the optimal composition of the ore mixture, which is fed to the beneficiation plant. Morphological studies of the main minerals in unchanged and metasomatically altered ferruginous quartzites were performed according to the standard method. Measurement of the magnetite and quartz grain sizes was carried out using an eyepiece micrometer mounted on a mineralographic microscope. The determining of their average indexes was carried out with the use of mathematical methods. The results of the study of the main morphological characteristics of iron ore-bearing minerals and their variations, depending on the location within the unchanged and metasomatically altered ferruginous quartz of Hannivka deposits at Northern region are represented. The results of the study of the dihedral angles of magnetite and quartz crystals, changes in the particle size distribution of these minerals, depending on the imposed geological processes on the banded-iron formation of Kryvyi Rig basin are shown. The scientific novelty consists in detailed conducting of mineralogical researches of the magnetite and quartz morphological features depending on their location in the section of the banded-iron formation of the Kryvyi Rih basin and in the further utilization of these results in topominerological mapping of the Northern region. The obtained variability of the main minerals' morphology of the ore-bearing strata must be taken into account in the mineral mapping of the deposit and the Northern region of the Kryvyi Rih basin in general, when specifying the mineral-technological classification of ores and the blended mineral varieties of ores before feeding to the beneficiation plant.

Soil Algae and mosses role in biocenoses formation in the tailings of Mikhailovsky Mining and Beneficiation Plant of Kursk Magnetic Anomaly

The paper presents the results of studies investigating the role of representatives of Algae and Bryophyta divisions in the composition of biocenoses dumps loess-like loam and clay of the Callovian of different ages (5-, 15-, 25 years) of Mikhailovsky Mining and Beneficiation Plant of Kursk Magnetic Anomaly. The author considers the role of soil Algae and mosses as indicators of biocenosis changes in connection with the peculiarities of the lithological framework and age of the dumps. It is proved that successione changes in communities of soil Algae and mosses coincide with succesional changes in the phytocenoses of the dumps in General. Studies have shown that the primary satelitales dumps are the representatives of the department of blue-green Algae Cyanophyta. They form a mono community in 5 year dumps clay of the Callovian and dominate in 5 year dumps. Further formation of the algae Alps in all types of studied rocks is of zonal type. The first of the mossy plants of the Bryophyta dumps division inhabits Ceratodon purpureus (Hedw.). It is the dominant species and persists on all breeds up to the age of 25 as the least demanding of the substrate. Further, the formation of the community of mosses is on a zonal type and lesavignon loam, on average, 15 years faster. It is found that algal communities and bryophytes cenoses form at different speeds on the soil stockpiles. It has been calculated that the stabilization of Algae cenoses will require about 19 years for the Quaternary loess and 32 years on the clay of the Callovian. Stabilization of the community of moss will require about 35 years for the loess and about 70 years on the clay of the Callovian.