Large-scale laboratory tests for smelting medium-carbon ferromanganese using JEZDA manganese ore and SiMn17 silicomanganese fines

At present, Kazakhstan has established production of ferrosilicomanganese, while refined ferromanganese is not produced. This is primarily due to a lack of high quality feedstock, as well as a lack of theoretical and applied research into new production conditions. To address these issues we conducted large-scale laboratory tests on smelting medium-carbon ferromanganese by one-stage silicothermic method. As a result of these tests, medium-carbon ferromanganese meeting the standard grade with more than 80 % manganese content was produced

Development of carbon ferrochrome smelting technology using high-ash coal

This article presents the results of experimental tests using coal from the Saryadyr deposit as a reducing agent for the smelting of carbonaceous ferrochrome. Large-scale laboratory tests were carried out on the smelting of carbonaceous ferrochrome in an ore-thermal furnace with a capacity of 200 kV · A. X-ray diffraction analysis of the obtained alloy and slag on a diffractometer was carried out. The presence of forsterite 2MgO·SiO2 and magnesitochromite Cr2Fe0,2Mg0,8O4 in the slag was revealed, as well as the FeCr compound and the absence of silicide compounds. The optimal percentage of replacing traditional coke with coal up to 30% (by weight) has been found, which can significantly reduce the specific consumption of quartzite in the charge

The possibility of involvement in ferroalloy conversion of nickel ores of Kazakhstan

The article considers the method of using substandard oxidized nickel ores of the Batamsha deposit and their suitability for sintering. Laboratory studies on the agglomeration of domestic nickel ores with different reducing agents were carried out for the metallurgical evaluation of nickel ores. Agglomeration was carried out according to standard technology, the layer height averaged 24 cm. The agglomeration process proceeded intensively at a discharge of 1100 - 1200 mm Hg, the sintering temperature of which reached over 1200°C. To improve the mechanical properties of the obtained agglomerates, it is necessary to continue research with a change in the composition of charge materials and a metallurgical assessment with the smelting of nickel-containing intermediates

Thermodynamic diagrammatic analysis (TDA) of the system Al-Si-Mn-Fe

The article presents the results of thermodynamic diagrammatic analysis of the Al-Si-Mn-Fe metal system as characterizing the final composition of the manganese-containing complex ferroalloy. By the method of thermodynamic diagrammatic analysis, the phase equilibrium of the Al-Si-Mn-Fe metal system was constructed, and the coexisting phases in the alloy were determined. Experimental samples of the aluminosilicomanganese alloy were studied on an Empyrean Malvern Panalytical X-ray diffractometer (XRD), where the presence of phases in the form of an intermetallic compound was determined - MnSi, Mn15Si26, Al2Fe3Si4, Al5Fe2, FeSi and structurally free silicon

Research of microstructure and phase composition of a new complex alloy – alumosilicomanganese (Al-Si-Mn)

The paper presents the results of a physicochemical study of a new complex alloy of alumosilicomanganese. The phase composition of the alloy was studied by X-ray diffraction (XRD) phase analysis on an Empyrean Malvern Panalytical X-ray diffractometer. Radiographs were processed and decoded using the Match! 3 software and the Full- Prof-2021 database. The HighScorePlus, Match! 3 and FullProf-2021 programs are based on the Rietveld method. The study of the microstructure of the alloy was carried out on a scanning electron microscope (SEM) of the JEOL - JSM7001F type. The chemical composition of the phases was determined using an Oxford INCA X-max 80 energy dispersive spectrometer (EDS) installed on a JEOL JSM-7001F scanning electron microscope

Research of microstructure and phase composition of a new complex alloy – alumosilicomanganese (Al-Si-Mn)

The paper presents the results of a physicochemical study of a new complex alloy of alumosilicomanganese. The phase composition of the alloy was studied by X-ray diffraction (XRD) phase analysis on an Empyrean Malvern Panalytical X-ray diffractometer. Radiographs were processed and decoded using the Match! 3 software and the Full- Prof-2021 database. The HighScorePlus, Match! 3 and FullProf-2021 programs are based on the Rietveld method. The study of the microstructure of the alloy was carried out on a scanning electron microscope (SEM) of the JEOL - JSM7001F type. The chemical composition of the phases was determined using an Oxford INCA X-max 80 energy dispersive spectrometer (EDS) installed on a JEOL JSM-7001F scanning electron microscope

Large-scale laboratory tests for smelting medium-carbon ferromanganese using JEZDA manganese ore and SiMn17 silicomanganese fines

At present, Kazakhstan has established production of ferrosilicomanganese, while refined ferromanganese is not produced. This is primarily due to a lack of high quality feedstock, as well as a lack of theoretical and applied research into new production conditions. To address these issues we conducted large-scale laboratory tests on smelting medium-carbon ferromanganese by one-stage silicothermic method. As a result of these tests, medium-carbon ferromanganese meeting the standard grade with more than 80 % manganese content was produced

Improvement of methods for semi-finished carbon product tapping from the basic oxygen furnace (BOF)

The article considers the experience of optimizing the slag adjustment mode in the Basic Oxygen Furnace (BOF) and reducing the proportion of oxide non-metallic impurities in steel. The article presents the results of a research on the separation of slag from metal during the starting period of carbon semi-product tapping, on the elimination of an emergency situation when the hole is shut up at any degree of slag viscosity, the use of the device at any tap hole diameter after the heat, the simplicity of the design. The use of the device makes it possible to increase the durability of the taphole lining, reduce repair costs, and improve the quality of steel by reducing non-metallic impurities. The innovative devices proposed by the author can be useful for metallurgical enterprises

Integrable Zhaidary equations: reductions and gauge equivalence

The present work addresses the study and characterization of the integrability of some generalized spin systems (ISS) in 1+1 dimensions. Lax representations for these ISS are successfully obtained. The gauge equivalent counterparts of these integrable ISS are presented. Finally, we consider Zhanbota transcendents and some integrable Zhanbota equations. In particular, the gauge equivalence between some Zhanbota equations and the six Painleve equations is established.Comment: 17 page

Oxidative Carbonylation of Dipropargylarylamines

The catalytic oxidative methoxycarbonylation reaction of N,N-dipropargylarylamines has been investigated. PdCl2-CuCl2 has been studied as a catalytic system. Consecutive reactions of substitutive and additive methoxycarbonylation have been going in this process, which has been complicated by dimerisation, polymerization and cyclization processes. Apparently the results of process are determined by stability of intermediate reactionary complexes with participation of catalytic system PdCl2-CuCl2. The structures of synthesized cyclic amino triesters are established by analysis of experimental spectra NMR 1H and 13C, comparison with calculated spectra of possible hypothetic structures and estimation of thermodynamics properties by Joback fragmentation and MOPAC Semi-empirical PM3 methods