Effect of some technological parameters of oxygen converter melting on the resistance of tarred dolomite ? Magnesite linings

Refractories ◽  
1970 ◽  
Vol 11 (1-2) ◽  
pp. 104-107
Author(s):  
A. F. Kuznetsov ◽  
P. I. Sham ◽  
N. K. Pashchenko ◽  
V. A. Bol'shakov ◽  
I. G. Zel'tser
Keyword(s):  
Oxygen Converter ◽  
Technological Parameters ◽  
Converter Melting

scholarly journals Analysis of the influence of technological parameters of steel smelting in top blowing oxygen converters on metal oxidation

2020 ◽  
pp. 3-9
Author(s):  
Viktor Herasymenko ◽  
Lavr Molchanov ◽  
Yevhen Synehin ◽  
Roman Andriukhin
Keyword(s):  
Mathematical Model ◽  
Oxygen Content ◽  
Oxygen Converter ◽  
Metal Oxidation ◽  
Technological Parameters ◽  
Metallurgical Enterprise ◽  
Crude Steel ◽  
Steel Deoxidation ◽  
Method Of Correlation ◽  
Aluminum Consumption

The article considers the influence of technological steelmaking parameters in an oxygen converter on the oxygen content in steel before tapping. Today, CELOX is an effective, but at the same time expensive method for measuring the oxygen content in steel. The information obtained using this device allows you to accurately determine the ferroalloys consumption for deoxidation of steel. Since the oxygen content in steel before production directly affects the ferroalloys and aluminum consumption, necessary for steel deoxidation, the aim of this work was to create a mathematical model that allows determining the oxygen content in steel before tapping, taking into account the controlled melting parameters. The object of the study was a top blowing oxygen converter of 60 t capacity. The following analysis was carried out for 3PS steel grade. To create a mathematical model, the factors that have the greatest influence on the oxygen content in steel before tapping were previously selected by the method of correlation analysis. Such factors included the carbon, manganese, sulfur and phosphorus content in steel before tapping, its temperature and specific consumption of oxygen. Using the method of multiple regression analysis, a mathematical model was determined, which allows determining the oxygen content in steel before tapping at the end of each melt. Comparison of the actual data on the oxygen content in steel before tapping with the results of calculation using the model showed their high convergence, which confirms the adequacy of the obtained model. The application of the developed mathematical model for predicting the oxygen content in steel before tapping in a real metallurgical enterprise will allow reduce consumption of ferroalloys and alumina for deoxidation of crude steel.

Technological estimation of skull effect on steel melting parameters in basic oxygen furnace

2019 ◽  
Vol 75 (5) ◽  
pp. 583-588
Author(s):  
V. A. Bigeev ◽  
Yu. A. Kolesnikov ◽  
M. V. Potapova ◽  
M. G. Potapov ◽  
S. V. Yudina
Keyword(s):  
Oxygen Converter ◽  
Thermal Conditions ◽  
Basic Oxygen Furnace ◽  
Converter Steel ◽  
Steel Melting ◽  
Technological Parameters ◽  
Additional Material ◽  
Basic Oxygen ◽  
Slag Skull ◽  
Oxidative Refining

Increasing the lining life of basic oxygen furnaces (BOF) reduces the expenses for refractories. Application of skull lining layer on the working surface is a good way to improve the efficiency of refractories. Features of the application of slag skull by the method of blowing a slag from previous melt with gas jet are discussed in the paper. It is shown that the presence of skull on the surface of the oxygen converter working lining affects not only the campaign duration of the unit, but also the technological parameters of steel melting, connected with its slag and thermal conditions. To quantify this effect, calculations of melting indices were performed for the conditions of BOF shop of PJSC MMK using a mathematical model based on the balance-statistical equations of physicochemical and thermal processes of oxygen-converter steel smelting. Taking into account the fact, that the skull is involved in the process as an additional material, that introduces slag-forming components and physical heat, the corresponding article of the heat balance was added to the program for melting parameters calculating. Assessment of the change of the amount of slag in the BOF in the course of steelmaking, knowing the possible arrival of the components from skull, was carried out. The calculations results of the change of the of melt metal components mass from the percentage of skull in the BOF are presented. The dependence of the change of the consumption of charge components on the amount of skull in the BOF is presented. It is shown that with an increase of the skull amount for smelting of the same steel mass some increase of metal charge will be required. This fact can be explained by increased iron loss with oxides, metallic beads and additional oxygen consumption for oxidative refining of the melt.

Slag-lining reactions in oxygen converter melting

Refractories ◽  
1968 ◽  
Vol 9 (3-4) ◽  
pp. 143-148
Author(s):  
V. D. Umnov ◽  
V. Ya. Pyatikop ◽  
V. A. Plokhikh ◽  
L. N. Zakharchenko ◽  
V. V. Slipchenko ◽  
...  
Keyword(s):  
Oxygen Converter ◽  
Converter Melting

scholarly journals Physical and Numerical Modeling of the Slag Splashing Process

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2289
Author(s):  
Viktor Sinelnikov ◽  
Michał Szucki ◽  
Tomasz Merder ◽  
Jacek Pieprzyca ◽  
Dorota Kalisz
Keyword(s):  
High Efficiency ◽  
Oxygen Converter ◽  
Mineralogical Composition ◽  
Technological Parameters ◽  
Factors Affecting ◽  
Technological Factors ◽  
Flow Parameters ◽  
Slag Splashing ◽  
Nitrogen Stream ◽  
Lance Position

The influence of technological factors on the process of slag splashing was analyzed in the paper. The problems were solved in several stages using our own and commercial calculation programs and laboratory tests. Based on the performed calculations and simulations, factors affecting the slag splashing were determined. It was observed that the high efficiency of the process can be achieved by optimizing numerous technological parameters, e.g., flow parameters, pressure, and temperature of the nitrogen stream, height and angle of the lance position, as well as slag height into which the gas stream enters and MgO consumption. In addition, the chemical and mineralogical composition of the slag and its physicochemical parameters should be also considered. The obtained results of numerical simulations of slag splashing in the oxygen converter coincide with the results of experiments carried out using the physical model of oxygen converter. This means that the simulations well represent the real course of the slag splashing process for the studied variants.

A possibility of using nickel concentrate, obtained as a result of hydrometallurgical enrichment of manganese-containing raw materials, at steel alloying

2020 ◽  
Vol 76 (7) ◽  
pp. 709-715
Author(s):  
O. Yu. Kichigina
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Selective Extraction ◽  
Technological Parameters ◽  
Nickel Iron ◽  
Nickel Recovery ◽  
Nickel Concentrate ◽  
Steel Alloying ◽  
High Degree ◽  
Comprehensive Processing

At production of stainless steel expensive alloying elements, containing nickel, are used. To decrease the steel cost, substitution of nickel during steel alloying process by its oxides is an actual task. Results of analysis of thermodynamic and experimental studies of nickel reducing from its oxide presented, as well as methods of nickel oxide obtaining at manganese bearing complex raw materials enrichment and practice of its application during steel alloying. Technology of comprehensive processing of complex manganese-containing raw materials considered, including leaching and selective extraction out of the solution valuable components: manganese, nickel, iron, cobalt and copper. Based on theoretical and experiment studies, a possibility of substitution of metal nickel by concentrates, obtained as a result of hydrometallurgical enrichment, was confirmed. Optimal technological parameters, ensuring high degree of nickel recovery out of the initial raw materials were determined. It was established, that for direct steel alloying it is reasonable to add into the charge pellets, consisting of nickel concentrate and coke fines, that enables to reach the through nickel recovery at a level of 90%. The proposed method of alloying steel by nickel gives a possibility to decrease considerably steel cost at the expense of application of nickel concentrate, obtained out of tails of hydrometallurgical enrichment of manganese-bearing raw materials, which is much cheaper comparing with the metal nickel.

Operation intensification methods of aggressive industrial sewage neutralization facilities

2020 ◽  
Vol 76 (11) ◽  
pp. 1149-1153
Author(s):  
N. S. Tsarev ◽  
V. I. Aksenov ◽  
I. I. Nichkova
Keyword(s):  
Cold Water ◽  
Specific Productivity ◽  
Technological Properties ◽  
Technological Parameters ◽  
Preliminary Heating ◽  
Sediment Treatment ◽  
Circulating Water ◽  
Equipment Operation ◽  
Sediment Volume ◽  
Industrial Sewage

To neutralize the waste pickling solutions and rinsing water, resulting from cleaning metal products s surface of rust by acids solutions, lime is used. Being cheap, this method of sewage neutralization has considerable drawbacks. Forming in the technological pipes strong gypsum depositions and low specific productivity of the equipment for sediment dewatering are most significant of them. Characteristic of aggressive industrial sewage, formed at pickling of ferrous metals presented. Methods of elimination of drawbacks of industrial sewage neutralization by lime considered, including stabilization of neutralized industrial sewage and control of properties of the sediment formed. It was noted, that stability of the circulating water can be provided by accelerating of crystallization of the forming gypsum sediments by introducing in it fine priming powder and heating the neutralized water up to 65-70 °С followed by thermal softening of a part of circulating water, removed out of the circulating system. It was shown, that the heating of the water and the ongoing changes of the composition and properties of the sediment result in decrease of filtration resistance 2-3 folds, increase of deposition speed 3-4 folds and decrease the sediment volume 1.5-2 folds comparing with lime neutralization in cold water. Calculated dozes of lime at the heating were taken the same as at the regular lime neutralization. Elimination of the circulating water oversaturation by bi-water gypsum can be reached also by addition into the water of powder-like gypsum pulp - priming powder for microcrystals of the gypsum, followed by aeration during 30-40 min. This method was tested under industrial conditions. Technological properties of the forming sediment can be improved by sediment treatment by flocculants and preliminary heating of the neutralized water up to 65-70 °С. Control of technological properties of the sediment is done by addition of flocculants and heating of the neutralized water. Recommendations for improving operation of the neutralization facilities presented with indicating particular technological parameters of the equipment operation for sewage and sediment treatment. 

APPLYING THE ISF TECHNOLOGY TO PRODUCE THE CAR PART MODELS

2010 ◽  
Vol 13 (4) ◽  
pp. 91-98
Author(s):  
Tuan Dinh Phan ◽  
Binh Thien Nguyen ◽  
Dien Khanh Le ◽  
Phuong Hoang Pham
Keyword(s):  
Rapid Prototyping ◽  
Incremental Sheet Forming ◽  
Cad Model ◽  
Post Processing ◽  
Technological Parameters ◽  
Batch Production ◽  
Complex Products ◽  
3D Cad ◽  
Real Size ◽  
Single Batch

The paper presents an application the research results previously done by group on the influence of technological parameters to the deformation angle and finish surface quality in order to choose technology parameters for the incremental sheet forming (ISF) process to produce products for the purpose of rapid prototyping or single-batch production, including all steps from design and process 3D CAD model, calculate and select the technological parameters, setting up manufacturing and the stage of post-processing. The samples formed successfully showed high applicability of this technology to practical work, the complex products with the real size can be produced in industries: automotive, motorcycle, civil...

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