The formation of dust was studied when plasma arc heating of galvanized steel in argon atmosphere at amperage from 170 – 190 A, argon consumption – 0.06 m3/h, pressure in the furnace – 0.1 MPa. It was found that zinc is almost completely evaporated during the first 30 seconds of melting. The structure of collected zinc containing dust is not homogenous; there are particles of different shapes (spherical, needle, spherical and filmy), sizes and composition. The elemental composition of individual particles of formed dust was analyzed at iCAP 6300 spectrometer (Thermo Electron, USA), on the basis of which their oxide composition was evaluated using TERRA program. It was shown that the dust is composed of particles, consisting of ZnO, Fe3O4, pure iron and carbon. Based on the results of the work it was concluded that during plasma-smelting of galvanized steel zinc containing dust can be traped separately from the remaining dust in the initial period of melting. 

The model for calculating the distribution of secondary gas emissions in the outer influence zone of metallurgical enterprises is proposed. The model is based on the principle of maximum danger. The main factors that determine the risk of exceeding the maximum allowable concentration of the secondary emissions are denoted. There are 4. the forming factor, the distribution emissions factor and the concentration shrinkage factors. Fundamental differences of calculation methods of primary and secondary gas emissions were shown. There was also defined that the formation of secondary emission occurs in the volume of air space in which the concentration of primary emission exceeds 5. its background concentration in the atmosphere. The analysis of the secondary emissions concentration as a function of the distance from OJSC “Magnitogorsk Iron and Steel Works” was built with the help of the spatially distributed source method. Graphs of the H2SO4 concentration depending on the distance from the source of the primary emission were built at different wind speeds. It has been found that the function of the concentration dependence on distance has a distinct maximum which value can be determined for any wind speed, knowing the average power of the primary emissions for a specific time period. 

The formation of dust when plasma arc heating of galvanized steel in argon atmosphere at amperage from 170-190 A, argon consumption - 0.06 m3/h, pressure in the furnace - 0.1 MPa was studied. Found that zinc is almost completely evaporate during the first 30 s of melting. Structure of collected  zinc containing dust is not homogenous; there are particles of different shapes (spherical, needle, spherical scarious), sizes and composition. The elemental composition of individual particles formed dust was analysed an iCAP 6300 spectrometer (Thermo Electron, United States), on the basis of which evaluated their oxide composition using the Terra programme. It is showed that the dust is composed of particles, consisting of ZnO, Fe₃O₄, pure iron and carbon. Based on the results of the work concluded that during plasma-smelting galvanized steel you can catch zinc containing dust separately from the remaining dust in the initial period of melting.

The paper presents a review of the investigation results in the field of nanopowder and consolidated powder nanomaterials. The features of the various powder fabrication methods are described and analyzed, as well as the produced nanopowders properties. The different methods of nanopowder consolidation (consolidation, sintering, sintering under pressure) are considered. The properties of such consolidated nanomaterials are listed and some perspective directions of their usage (as the engineering, functional and high-energetic materials) are pointed out. 

Studies on the production of electrolytic manganese dioxide (EMD) from purified solutions after leaching of manganese sludge were held. The effect of anode current density on electrolysis manganese sulphate solutions is determined. The analysis of pre-treatment of manganese solutions before electrolysis was made. Conducting cleaning solution at pH 6,5–7,0 provides maximum deposition of impurities harmful to electrolysis of copper, zinc, nickel, cobalt, aluminum, phosphorus, arsenic, antimony, iron (III) and iron (II). After the deposition of impurities sludge is filtered, hydrate precipitate is washed, filtered liquid phase is sent to electrolysis to produce EDM. The EDM samples were examined using X-ray fluorescence, X-ray diffraction and scanning electron microscopy. The results showed that the EDM obtained under the laboratory conditions at an anodic current density in the range of Iа = 150–200 A/m2, meets all the requirements for high-level product: mass fraction of the main component – МnО2 is 95–96,5 % at the experiments. 

The paper suggests ways to determine the deviations of technological process of vacuum arc remelting. Video cameras were installed in the vacuum arc furnace to monitor the refining process. Typically, the automated control system of remelting measure only the desired quantities for direct control, by which in some cases it is impossible to determine the occurrence of specific abnormal conditions of melting. The steelmaker can detect and eliminate them with the usage of the images from the camera. The resulting image is divided into shots. Each shot is a matrix composed of pixels. Using the amount of pixels of the image the specific abnormal remelting modes can be determined. The authors have proposed video processing algorithms to detect the abnormal melting modes. 

The concept of metal construction minimization of finished products requires an increasing set of requirements for steels as structural materials. In this context, issues related to the study of the continuous casting defects macrostructure behavior (shrinkage, gas holes, axial porosity) during deformation are very actual. This work presents further development of metal forming processes research methods with layered physical models use. Layered models usage in conjunction with the proposed method of defects application on the surface of n-th layer and processing information method concerning the nature of its forming allows to evaluate the rate deformation influence during the process of “healing”. The initial adaptation of the proposed method applying to the conditions of the deformation process simulation of continuous casting in the first three rectangular breakdown stand calibers of linear mill 500/370 of PJSC “DMPZ” has been performed. Obtained experimental data allow to clarify the existing mechanism of “healing” of axial discontinuities defects in metal depending on the overall elongation and schemes of deformation application. 

The thermo-physical properties of titanium-magnetite Kachkanar pellets of various basicity were carried out. Using the method of mixing, the dependence of the average physical specific heat of pellets under the temperature and phase composition was found. To find an apparent heat capacity of pellets the authors have used the gravimetric system with continuous registration of changes in the mass of pellet which provides the creation of an oxidizing or neutral atmosphere to separate the processes of oxidation and decarbonization. The coefficients of pellets thermal diffusivity were determined using a quasisteady method enabling simple ratio calculation during continuous heating. The coefficients of thermal conductivity of the pellets were found from the equation connecting the density, heat capacity and thermal diffusivity coefficients. The results are of particular interest and can be used in the design of the new firing units, as well as the optimization of design and operational parameters of the existing ones. 

The vibrometry method of diagnosing the destruction of the eccentric shaft of the oscillation mechanism drive of the continuous casting machine mold was developed based on the research of influence of fatigue fracture of the shaft on the amplitude-frequency characteristic and the vibration level of the oscillation mechanism. Using the Shengli theory to determine the current crack length of the eccentric shaft, the dependence of the shaft stiffness variation with time was derived. The study of this dependence has shown that decreasing shaft stiffness leads to the increase of total vibration level and spectrum of fluctuations of the drive of mold oscillation mechanism. The obtained results allowed to establish the discernment boundaries of status (integrity) of the eccentric shaft of the drive of the mold oscillation mechanism by the vibration level depending on the rotational speed of the motor shaft on the basis of GOST ISO 10816-1-97. The proposed vibrometry method for diagnosing the drive of the CCM mold mechanism is focused on the use of widely available portable vibration analyzers. 

On the base of the temperature perturbations front and additional boundary conditions the authors have obtained the approximate analytical solution of the heat-conduction problem for infinite plate by boundary conditions of the third kind and time-variable heat source. Heat-conduction process was divided into two stages according to the time, that (dividing) helps to find simple analytical solutions for each stage separately. Obtained solutions are in the form of algebraic power series with time-dependent coefficients, those (coefficients) defined major and an extra boundary conditions, specified at the boundary points and at the temperature perturbations front, but in such a way that their implementation of the desired solution was equivalent to executing differential equations boundary-value problem in the whole range of spatial and temporal variables. Using described method it is possible to obtain analytical solutions in the entire time range of the non-stationary process, including small and the smallest values, almost with a given degree of accuracy. Obtained in this work, an analytical solution was used to identify time-varying source of warmth by solving the inverse heat-conduction problem.

Traditional approaches to solving the problems of operational process of automation (situational) production management of cold pipes are based on the construction of the classic behavioral research operations using quantitative information, which leads to a significant loss of semantic content of the information structure of semistructured problems of adequate procedures for the selection of alternative solutions. The article describes the alternative approach based on the synthesis of natural language semiotic models using semantic information in the development of tools for ARM type “Advisor Wizard”. 

The peculiarity of Kovdor deposit ores is the presence of magnetite of heterogeneous structure when the isomorphic impurities present in celonite matrix as separate spinel phases: FeAl2O4 , MgFe2O4 , TiFe2O4 . The authors have investigated the process of phase transformations of magnetite crystals of heterogeneous structure in conditions close to sinter. In the range of 1100 – 1300 °C in reducing environment occurs the dissolution of magnetite crystals in two oxide phases: magnetite and wustite with redistribution of isomorphic impurities between them. At the same time the silicates with high melting points are formed in the joints of crystals of oxide phases with the host rocks. Therefore, the composition of oxide and silicate phases is the cause of the previously established retardation of the process of melt formation during iron ore sintering with the participation of magnetite concentrate of Kovdor deposit. 

According to the author of this article, Gorskii effect may be crucial in the development of technologies for the manufacture of precision metal configuration (standards, tools, machines). The phenomenon of V.S. Gorskii continues to reveal new facets and, of course, waits for its researcher and the author is confident that the results to be obtained will surpass the most incredible expectations and projections.