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Bioleaching of sulfide minerals has been successfully applied worldwide for obtaining copper for decades. This technology provides about 5% of world copper production and is used as an alternative for pyrometallurgical processing of copper ores. Despite widespread of biohydrometallurgical technologies, there are a number of issues in this area, which impede the development and commercialization of bioleaching. For example, chalcopyrite (CuFeS2), the most abundant copper sulfide mineral, is refractory to biooxidati...

Industrial size reduction processes such as crushing and grinding play vital roles in rock quarrying. The present study states real field data concerning secondary crushing operations through the cone and horizontal shaft impact (HSI) crushers. In this regard, a total of 44 case studies were collected from several rock quarries located in various parts of the world. Based on the field data, crushing performances of the cone and HSI crushers were compared by statistical analyses. The statistical analyses demonstrat...

Biohydrometallurgical technologies based on the oxidation of sulfide minerals by iron- and sulfur-oxidizing acidophilic microorganisms are widely used to extract non-ferrous and noble metals from sulfide ores and concentrates. Acidophilic microorganisms oxidizing sulfide minerals include autotrophs, heterotrophs, and mixotrophs. Therefore, studying of the effect of different carbon sources on biooxidation of sulfide minerals is relevant issue. The goal of the present work was to study the effect of different organ...

A large number of precious metals such as molybdenum, gold, uranium and much more are obtained from sulfide ores. Currently, a large number of hydrometallurgical methods are used to extract precious metals, which in turn are outdated in this field. In this regard, it is necessary to develop new modern methods for extracting all valuable components from sulfide ores. One of these methods is the process of bio-leaching with the use of microorganisms. The use of this method in mining companies will help reduce the ri...

The paper considers the formation and development of modern ideas in the field of mathematical modeling of the interaction of ferromagnetic particles and external magnetic fields in mineral processing. The implementation of such studies is dictated by the need to identify methods for the analytical representation of the physical laws of the aggregation of ferromagnetic particles, which are a basis for the various technological equipment used in the iron ores processing. The identification is aimed at the use of in...

Development of specific engineering solutions for environmentally friendly mineral processing waste management and their practical implementation is an important step on the way to resource efficiency, sustainable development and Earth preservation. Specific engineering solutions application for technological waste management reduce the natural resources use and have a direct positive environmental effect. The technological mineral processing waste have to be study in two aspects - as sustainable development probl...

The main purpose in mineral processing plant is to obtain the highest possible value from a processed raw material. In majority of concentrators in the world mining the first step of the processing technology is sieving of ore that is performed using vibrating screens. Usually, in the whole technological system there are only several such machines. That is why their continuous operation is critical and they are often concerned as a bottleneck of the whole system. Although the vibrating screens are expected to keep...

The paper deals with developing of an innovation of the device called "Device for sensing mechanical-physical and optical properties of bulk solids" used for examination and localization of life-threatening places. The device has been created of a standard device using an education model-the ideas of a student in cooperation with a teacher mutual sharing knowledge and experiences and enriching each other. The device has been patented and published in Espacenet database under European Patent Office and represents a...

This work studied the problem of the joint use of Gauss - Laplace and B (beta) distributions to describe the disintegration of minerals of polymineral ores, which is associated with the liberation of mineral grains - the release of monomineral particles from intergrowths with other minerals. The basic position of the work is the dependence of the result of reducing the size of mineral particles on the energy expended on this process, postulated in the mineral processing theory. This dependence was taken into accou...

The paper presents the results of mineralogical and technological research of tailings produced during processing of rare-metal columbite ore of the prospective Zashikhinskoe deposit. The grain size analysis of a tailings sample showed that the most part of the material is represented by fine-grained particles with 53.3% yield of size fraction -0.045 mm. Mineral composition of the tailings is mainly represented by quartz, albite and microcline. Total content of minor minerals, such as muscovite, columbite, cryolit...

Thermal dehydration of a natural hydrous ferric sulfate Fe(SO4)(OH)?2H2O was studied using x-ray-phase and thermal analyses. This mineral was found in the hypergenesis zone of the Khangalas gold deposit, Eastern Yakutia, Russia. A comparative analysis of the sample with known hypergenic hydrous ferric sulfates with a similar Fe2O3:SO3 ratio close to 1:1 was performed. The dissimilarities between the founded mineral and its possible polymorphs ? butlerite and parabutlerite are identified. The mineral is less stable...