R.A. Gizatulin

Optimizing Technological Parameters of the Reduction Processes in Treating Steels in a Ladle Furnace

This work reports the possible development of reduction processes when treating the molten metal and slag using a ladle furnace under conditions of intensive stirring with an inert gas. The industrial data have been received, confirming the possibility of decreasing the concentration of ferrous and manganese oxides in the slag and stabilizing the contents of manganese and silicon in the metal.

Distribution of Liquid Flow Rates in the Process of Bubbling with Gas Through Gas-Permeable Inserts

The authors studied the distribution of the vertical components of the rate in the ascending gas-liquid flow when blowing through the bottom nozzle at two levels under three modes of neutral gas supply. It was estimated that under the intensities of gas (nitrogen) of 2 and 4 L/min-t the type of rates distribution in both cross-sections does not differ from the generally accepted one and practically does not depend upon the intensity of gas supply.

A Technology of Wastewater Sludge Treatment

At many communities, industrial and agricultural enterprises, treatment and recycling of wastewater sludge is an urgent task as the sludge is poured and stored in sludge banks for many years and thus worsens the ecology and living conditions of the region. The article suggests a new technology of wastewater sludge treatment using water-soluble binder and heat treatment in microwave ovens.

Extraction of Chromium from Carbon Ferrochromium Residual Wastes

This work reports the problem of processing residual wastes after producing carbon ferrochrome by recycling dust using a hydrometallurgical method with the purpose of extracting the basic component - chromium, The X-ray diffraction analysis results, chemical and granulometric compositions of dust from the carbon ferrochrome production are given, The method for the production of chemical-enrichment concentrate (CEC) by processing ferrous dust is described, with obtaining a middling product - sodium mono-chromate with its further reduction to chromium hydroxide, followed by autoclave leaching, and resulting in the production of chemically enriched chrome concentrate, The plant used for autoclave leaching and filtering is schematically depicted, The smelting process of metallic chromium using the ladle aluminothermic method is described,

Improvement of Research Procedures into the Highly Rigid Welded Metal Using Thermal Microscopy Facilities

A research procedure and configuration of a welded sample are proposed to explore properties of welded metal using thermal microscopy facilities.

Influence of the Cobalt Additive on the Flux Cored Wire of System Fe-C-Si-Mn-Cr-Ni-Mo-V

Studied the effect of the introduction of cobalt into the charge powder fused wire system Fe-C-Si-Mn-Cr-Ni-Mo-V, used in cladding assemblies and equipment parts and mechanisms operating under abrasive and abrasive shock loads., the samples cored wires were manufactured in the laboratory conditions using appropriate powder materials and as a carbonfluoride contained material were used the dust from gas purification of aluminum production.

Processing of Industrial Metallurgical Wastes as the Basis of Manufacturing Technology Welding Fluxes and Additives NIM1

Presented are the results of the use of metallurgical wastes as constituents of welding fluxes. On the basis of fine particle gas purification in aluminum production, a carbon fluoride additive (FD-UFS) has been designed for welding fluxes which allows for manufacturing of steel constructions of northern execution with improved mechanical properties of welded joints. It is shown that the introduction of FD-UFS to fluxes AN-348, AN-60 and AN-67 increases the range of the required mechanical properties. Composition and manufacturing technology has been developed for a new welding flux with application of slag from silicomanganese production. Fractional composition of the flux has been selected. A comparative assessment of the mechanical properties of the developed flux with widely used flux AN-348 (GOST 9087-81) showed that the mechanical properties of the new flux are much greater. It has been determined that the introduction of flux additive FD-UFS in the amount of 2-8 % significantly increases the value of toughness KCV at a temperature of minus 20 °C.

Modern Methods of Rail Welding

Existing methods of rail welding, which are enable to get continuous welded rail track, are observed in this article. Analysis of existing welding methods allows considering an issue of continuous rail track in detail. Metallurgical and welding technologies of rail welding and also process technologies reducing aftereffects of temperature exposure are important factors determining the quality and reliability of the continuous rail track. Analysis of the existing methods of rail welding enable to find the research line for solving this problem.

Distributive Characteristics of Gas Phase in a Liquid when Bottom Blowing

This paper provides the results of research into the structure of gas flow in a plume rayed by laser in barbotage zone. The technology of steel out-of-furnace treatment facing a number of challenges necessitates a quite clear view of mechanisms of structure formation and dynamics of liquid and gas phases in an upward gas-liquid flow (in a “plume”) above the gas-feeding nozzle. Gas phase distribution, plume height and cross-section distribution and values of liquid rates determine mainly the dynamics of a melt flow in other out-of-the-plume parts of the bath.

The Influence of Melting Technology and Out-of-Furnace Treatment on Composition of Nonmetallic Impurities in Rail Electric Steel

The paper considers the influence of melting technology and out-of-furnace treatment on the nature and amount of nonmetallic impurities in rail steel. The dependence of the nature of nonmetallic impurities on oxygen concentration in steel is stated. The paper demonstrates the influence of oxygen concentration on rail metal quality.