Technological mineralogy in qualitative appraisal of mineral raw material of natural and artificial origin

Комплексная оценка твердых полезных ископаемых: междисциплинарность технологической минералогии и современные вызовы

2023-12-12T18:37:11+03:00

Показаны возможности комплексной оценки твердых полезных ископаемых методами технологической минералогии. Акцентировано внимание на научно-методическом сопровождении минералогических исследований, требованиях к минералогической информации, необходимых при оценке минерального сырья.

Petrographic structures and statistics of intergranular contacts

2023-12-07T17:24:51+03:00

The article draws attention to the current unsatisfactory definition of petrographic structures and textures. This is what leaves them descriptive and does not allow them to be fully taken into account in the characterisation of rocks and ores. The approach based on intergrain contact statistics is briefly outlined and a mathematical definition of petrographic structure is given. It is pointed out that calculation of intergrain contact statistics in thin sections in real time and with high accuracy is possible only by means of adapted optical analyzers.

Buryatia’s ultrabasic and Basic rocks as promising raw materials for deep reworking

2023-12-07T17:24:51+03:00

The paper discussed the potential of mafic and ultramafic rocks from Yoko-Dovyren massif as a raw material for the building sector. The gravel from such rocks has high quality and can be used for the production of high-strength and durable concrete and asphalt concrete. The use of ultramafic and mafic rocks as a mineral additive allows for the production of ceramic bricks that are comparable in characteristics to traditional counterparts.

Mineral potential of the Paleoproterozoic Tiksheozero-Yeletozero ultramafic-alkaline-carbonatite intrusive complex, North Karelia, Russia

2023-12-07T17:24:52+03:00

Data on the mineral potential of the Tiksheozero-Yeletozero ultrabasic alkaline-carbonatite intrusive complex located in North Karelia were obtained by the long-term geologo-petrological, mineralogo-geochemical, geochronological and mineragenetic studies of Middle Paleoproterozoic magmatism in this area. Industrial mineral (titanomagnetite, ilmenite, nepheline and alkaline syenite, carbonatite with apatite and calcite and olivinite) deposits and occurrences, as well as rare-metal and REE mineralization, are described. The Tiksheozero-Yeletozero complex may provide a basis for the formation of an economically profitable mining zone.

Ecological consequences of the quarrying of an alluvial monazite placer deposit, eastern Trans-Baikal region

2023-12-07T17:24:52+03:00

Monazite is phosphate containing rare-earth elements and thorium (up to 10 %). A secret monazite placer mining company was operating in Novotroitsk, Baleya, Trans-Baikal Region, under the USSR Atomic Project from 1949 to 1964. Monazite sand was used as building material. After the shutdown of the company, many industrial and apartment buildings were found to be highly radioactive. By now, most environmentally hazardous structures have been destroyed. However, radiation danger for the population persists. The results of element analysis of soil samples taken from the central zone of Novotroitsk are reported. The data obtained show high concentrations of some elements, which exceed maximum allowable concentrations. The total soil pollution index (pollution index), calculated for five chemical elements (Pb, As, Sb, Ag and Th), indicates an environmental situation moderately hazardous, hazardous and extremely hazardous for human health and the need to conduct detailed geochemical soil monitoring.

Detecting phases in tungsten concentrates negatively affecting their quality

2023-12-07T17:24:52+03:00

We separated two samples of fine-grained and close-grained tungsten concentrates using gravitational and electromagnetic separation methods. The concentrates were obtained as a result of the enrichment of stale tailings of the Barun-Naryn technogenic deposit. The mineral and chemical composition of the initial concentrates and their fractions was studied using a complex of methods: optical-mineralogical, mineragraphic, powder X-ray diffraction, energy dispersive X-ray microanalysis (EDXMA), atomic emission spectroscopy and X-ray fluorescence. It has been shown that tungsten concentrates contain sulfur, which is a harmful impurity. Electromagnetic separation makes it possible to improve the quality of tungsten concentrates, remove negative phases and obtain several types of raw materials: grade 3 tungsten-huebnerite concentrate and scheelite carbide concentrate. A magnetite fraction was obtained, which in terms of the amount of iron corresponds to rich iron ores. A monazite-containing fraction enriched in rare earth elements (lanthanum and cerium) can be distinguished.

Sulphide minerals from cupreous sandstone occurrences in the Trans-Baikal region

2023-12-07T17:24:52+03:00

The article deals with the results of the mineralogical and technological characteristics study of cuprous sandstone ores. The authors have determing the material composition, textural and structural characteristics and intergrowth's types of ore mineral in crushed ore. The obtained data were used to choose the optimal mode of ore preparation and to predict the distribution of ore minerals and their intergrowth in the enrichment products

Technology for increasing the quality of quartz concentrates developed by PLASLAY OJSC

2023-12-07T17:24:52+03:00

PLAZLAY OJSC experts have developed an integrated general-purpose technology for basic and deep quartz enrichment used for the production of high-purity quartz concentrates. The technology is of great industrial interest due to the low cost price of environmentally safe quartz grain enrichment methods and a short payback period of investment.

Mineralogical assessment of waste from the Krasnobrodskaya-Koksovaya Coal Concentrate Factory

2023-12-07T17:24:52+03:00

The article deals with the importance of studying the material composition of coal mining waste before choosing a technology for their enrichment. The authors studied the flotation waste of the coal concentration plant "Krasnobrodskaya - Koksovaya". Data on the material composition of the starting material are obtained. The effect of mineralogical features of the waste on their dressing was determined.

Valuable impurities in ash from burning of coal from the Elibastuz Coal Basin and its recovery potential

2023-12-07T17:24:52+03:00

Valuable trace element distribution in ash formed upon burning coal from the Ekibastuz Coal Basin was studied using up-to-date analytical methods. Problems in the recovery of valuable trace elements are due to their low concentrations, the presence of caked aggregates of particles of varied mineral origin and irregular trace element distribution in ash.

Integrated reworking of coal waste: mineralogical composition and possible application of gravity-magnetic dressing technology

2023-12-07T17:24:52+03:00

The results of the study of waste from a Coal Concentration Factory, used as a secondary mineral product, are reported. A gravity magnetic concentration technology was developed with regard for the mineralogical composition of coal slime. Industrial tests of coal slime concentration capacity have yielded two commercial products: coal concentrate with 25.5 % yield, which can be used in power engineering, and ferruginous concentrate with an iron concentration of 64.72 % for metallurgy.

New approaches to multi-functional sorbent production

2023-12-07T17:24:52+03:00

The possibility of creating carbonized sorption materials for extracting organic and inorganic toxicants from aqueous media based on industrial waste and secondary products of plant raw materials is considered. The phenomena of sorption–desorption of uranium-238 and mycotoxin T-2 on carbonized organomineral sorbents have been studied. Promising directions for the practical use of the developed sorption carbon materials are proposed.

Technological control of the concentration of natural alumosilicate raw material using electron microscopy

2023-12-07T17:24:52+03:00

Our study has shown the efficiency of a Tescan MIRA II LMU autoemission scanning electron microscope for technological control of the dressing of glauconite sand from the Belozersk deposits located in the Saratov Oblast.

Mineral composition and qualitative characteristics of apodolomitic nephrite: case study of body 1 at Prozrachny prospect of the Kavoktinsk deposit, Middle Vitim Highland

2023-12-07T17:24:52+03:00

The results of the mineralogical study of apodolomitic nephrite from the Kavoktinsk deposit are reported. A nephrite formation model (the evolving of diopside after dolomite, the replacement of diopside by tremolite and the replacement of prismatic tremolite by felted-structured tremolite) is presented. Tremolite is occasionally derived directly from dolomite. Tremolite is then replaced by chlorite. Granites provide heat for metasomatism. The involvement of amphibolites in nephrite formation is responsible for a variety of nephrite colours. Metamorphism is responsible for tectonic crushing, which contributes to fluid penetration, and stress, which provides felted nephrite structure.

The use of overburden from the Korpanga deposit, Karelia, as quartz-feldspathic raw material

2023-12-07T17:24:52+03:00

The paper discusses the potential of leptite gneiss from the Korpanga iron deposit, Karelia, as a raw material for the production of facing ceramics. The properties of feldspar concentrate, produced by floto-magnetic enrichment of leptite gneiss, are described. It is shown that the use of the concentrate as additive for ceramics decreases roasting temperature and increases its strength.

Modified minerals from the History Section of the Institute of the Earth Crust, RAS, Siberian Branch

2023-12-07T17:24:53+03:00

Modified minerals, exhibited in the History Department at the Institute of the Earth Crust, RAS, Siberian Branch, are discussed. Methods and techniques for ennobling of nephrite, agate, chalcedony, yellow-green beryl and charoitites of various structural and morphological types, developed and tested at the Laboratory of petrology, Geochemistry and Ore Formation of the above institute, are described.