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The ordinary Portland cement (OPC) as usual binder is widely used for the backfilling in the Zijinshan Copper mine of Fujian province, whereas it leads to high cost of cemented paste backfill (CPB) every year. The main objectives of this study were to investigate the effect of low-calcium fly ash (LCFA) substituting for OPC on the compressive strength of CPB samples, through treating LCFA with mechanical and chemical action method to improve its pozzolanic activity. The experiment results show that the compressive strength of CPB samples is not increased when the non-treated LCFA is added into substitute for partial OPC. However, the compressive strength is obviously improved by the replacement of partial OPC with treated LCFA. When the substitution ratio of treated LCFA is 29.8%, the 28-day compressive strength of CPB samples with binder/tailing ratio of 1:6 achieves 3.9 MPa, and is 1.95 times higher than that of CPB samples with OPC as sole binder under the same condition. The economic analysis result exhibits a partial replacement (29.8%) of OPC with treated LCFA can save 28.7% of cemented backfill cost, indicating great economic benefit for underground backfilling mining.

The optimization problem is formulated for the cross-section outline of bulkload on a belt conveyor and for the kinematic parameters of the latter. The analytical solution on the optimum angle of side rollers and cross-section outline of bulkload on the belt is presented. The influence of the friction angle on the optimum cross-section outline of bulkload on the belt is illustrated. The optimization of velocity and acceleration of belt conveyor in the start period is described. The influence of the angle of the side rollers on the rolling friction is determined.

The article offers the force and geometry analysis of the stone block-diamond wire saw system. The friction force of the diamond wire saw in the block is determined at the parabolic adjustment of the wire sawing trajectory. The curves of the sawing force and horizontal coordinates of the blocks are plotted at different values of the parabola focus point. The actual sawing trajectories in monoliths and blocks are described. The load increase factor at the beginning of work is obtained. Using the procedure of the actual sawing trajectory, the strength analysis of the diamond segments of the diamond wire sawing machine is performed, and the stress diagrams in the diamond segments with a sharp and rounded edge are constructed. The maximal stresses in the diamond segment with the rounded edge are plotted as function of the rounding radius.

The authors discuss dynamics of gas bubble and mineral particle in low-viscous fluid. The particle-bubble interaction model represents a system of associated differential algebraic equations. Dynamics of the disturbed system is described using the Lagrangian method. The model takes into account oscillations of bubble surface and attached solid cylindrical particle in the infinitive volume of perfect incompressible liquid. The capillary force retaining the particle on the bubble is governed by the meniscus shape which conditions the wetting angle. The Legendre series expansion is used to represent small axially symmetrical oscillations of the particle-bubble system. The potential and kinetic energies of the system are expressed in terms of the coefficient of this series. The resultant eddy-free velocity field allows including the viscosity effect with regard to the local rates of energy dissipation.

The article describes the studies on the material constitution of two lead-zinc ore samples from the Gorevka deposit. The samples are difficult ore because of fine dissemination of galena and its complex intergrowth with sphalerite; feature partial replacement of lead sulfide by anglesite and cerussite; contain colloform galena. The initial ore samples underwent the X-ray phase, chemical and grain-size analyses, with sizing of target elements. The tests of selective flotation of the samples, with variation of size grade in the lead circuit, in different reagent regimes and with the subsequent electron microscopy of the products proved the processing difficulty of the test ore.

The authors investigate the structural and colloid properties of a collector represented by amine hydrochlorite treated by ultrasound and included in sylvinite flotation. Using the viscosity-temperature dependences, the Gibbs free energy is calculated for amine hydrochlorite with and without treatment by ultrasound. It is found that ultrasound-treated amine added in salt-fat solutions are more stable to coagulation. From the synchronous thermal analysis, IR spectroscopy and H-ray phase analysis, it is inferred that ultrasonic treatment of amine hydrochlorite slightly increases crystallinity of amine. The research findings improve understanding of the ultrasound effect on the change in the structural and colloid properties of the collector, which are important to optimizing output, sustainability and efficiency of potassium chloride production by flotation.

This article discusses the process flow chart for the recovery of the rare earth-bearing minerals monazite and zircon. The results of this study show that 97.9% monazite with 0.006% yield and 61.2% recovery can be achieved from a feed sample containing 0.0096% monazite by using spiral, electrostatic and magnetic separators followed by flotation. When zircon is subjected to study the process mineralogy, it is observed that a zircon grade in the feed sample containing 0.028% zircon can be upgraded to a zircon grade of 98.7% at the yield of 0.006% and the recovery of 21.5%.

Potentiality of drain water injection in deep geological structures is investigated as a case-study of drainage system at Yakovlevsky Mine. The problem ensues from the presence of a very high zone of conductive fractures and from the very intense hydraulic connection between the water-bearing bottom coal layer and crystal ore layer due to the increased size of the mined-out space as the mine reaches the production capacity of 5 Mt, which can lead to water inrushes to underground stopes. The authors perform the predictive modeling of the joint operation of the drainage system and drain water injection to the bottom-layer water-bearing coal stratum with a view to improving safety of mining.

Introduction. One of the main tasks of humanitarian knowledge is to identify threats to social stability and analyze protective social mechanisms that ensure the effectiveness of building relationships in society. There is a developed tradition associated with comprehension of the role of patriotism in ensuring the constructiveness of social relations. In the conditions of intensive social challenges, the issue of factors and conditions of patriotic consciousness development in society is actualized. Against the background of a developed tradition of understanding the cultural factors of patriotism, there is a relatively low number of studies on the role of institutional factors in the formation of constructive civic attitudes. The present study focuses on the socio-philosophical analysis of the influence of institutional factors on the development of patriotism in society, which is realized on the example of family and educational institutions. The research methodology includes methods of analysis and deduction, as well as socio-phenomenological and structural-functionalist approaches. Discussion. The theoretical analysis carried out in the article is based on the comparison of the main components of patriotic consciousness (attitude to the Motherland, patriotic values, evaluative judgements in relation to the surrounding social reality, active social attitudes, the way of social self-identification) and social functions of family and education related to the formation of these attitudes. It is substantiated that at the level of the family institute the mechanisms of social continuity are implemented, associated with the perception by the younger generation of ideas and ideas carried by older family members, in this regard, the role of the family in the formation of patriotism is mainly associated with the initial characteristics of civic attitudes of society members. At the level of the education system, centralized processes of formation of civic attitudes are implemented. Conclusion. Ensuring the development of patriotism in society largely depends on the functional characteristics of the institutions of education and family. The analysis of social functions of family and education, as well as their influence on the dynamics of patriotic consciousness indicates the need to exclude dysfunctional processes in these institutions. This is due to the fact that these institutions provide to the greatest extent the key conditions for the development of patriotism in society.

Introduction. The purpose of the research is a philosophical understanding of the theory and practice of Aikido in the system of mastering this martial art. The relevance consists in the formation of a harmoniously developed, spiritual and moral personality in the process of mastering Aikido; a personality strong in body and spirit; in the long term, the reproduction of positive ideological values: patriotism, humanity, empathy, etc. The research methodology is based on a cultural and civilizational approach using dialectical and general scientific methods. Such as the analysis of modern foreign literature on the history, theory and philosophy of Aikido; a method of comparing and extrapolating data from the theory and practice of teaching to the modern soil of mastering the art of Aikido and identifying its educational potential. The object of the study is the process of mastering the martial art of Aikido. The subject is the philosophical principles underlying Aikido. Based on the study of primary sources on the theory and philosophy of Aikido, modern foreign and domestic sources, the article reveals and actualizes the basic principles of Aikido philosophy from the point of view of their educational significance. Discussion. The principles of the Aikido philosophy are based on the idea of gratitude to the Universe, ancestors, people around us and the surrounding world around us. The second fundamental idea is virtue: bravery, wisdom, love and empathy. The connection of kindness and gratitude with important humanistic values, which form the core of a person’s spiritual essence, has been realized. The connection between the basic principles of the philosophy of Aikido and the physical form of Aikido techniques, which consist in the mutual harmonious development of personality in the process of education, is revealed. Conclusion. Based on the nine principles of dialectical unity of the philosophy of Aikido, the concept of “Aikido technique” has been developed.