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Assessment of Stability the Chemical Composition of Slags

Sitko Jacek

Archives of Foundry Engineering

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2023

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Vol. 23, iss. 2

145--150

EN

Metallurgical slags are an object of the increasing interest in terms of the possibility of their utilization, especially as materials used in the construction and road building industries, in the foundry industry for refining and purifying liquid alloys, the production of abrasives for surface treatment of remanufactured machine parts, as mine backfill materials. Metallurgical slags, in order to be used in foundry processes, should be characterized by the stability of the chemical composition. This paper presents the results of statistical analysis calculations, in which using a specific group f samples, knowing their chemical composition, the mean value Ā, variance Ϭ2, standard deviation Ϭ and the classical coefficient of variation V were determined. The research and its results report the amount of variation in considered components of the slags.

2

Analysis the Influence of Steel Sheet Production Technology on the Quality Products in Steel Service Polska

Sitko Jacek

Multidisciplinary Aspects of Production Engineering

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2021

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Vol. 4, Iss. 1

301--308

EN

The process of production and processing and preparation for distribution of steel products is associated with the requirements of maintaining appropriate procedures. They allow, in accordance with industry standards to avoid unforeseen problems associated with the preparation, implementation and finalization of activities aimed at achieving the intended purpose, which is a finished product of adequate quality and customer satisfaction. It is not always possible in the production process to meet all the requirements and technological, organizational and human factor recommendations. The analysis of selected problems, which includes the content of the article allows to significantly determine the factors and parameters associated with the preparation and technical implementation affecting the implementation of the intended objectives of the company, i.e. achieving an appropriate level of quality and minimizing the defects in the process of steel sheet preparation. Analysis of selected parameters was made on the basis of data obtained in the company operating on the international market Company Steel Service Poland. At the request of company representatives, the name has been changed due to the production data used in the article, which may be considered as sensitive. The article contains data based on research carried out in Steel Service Poland. Selected problems are the subject of analysis of steel sheets cutting processes with the analysis of causes of customer complaints with reference to the produced steel products. Selected steel grades and factors affecting the efficiency of the technological process are presented. The analysed set of factors translates into the level of product quality and reduction of arising defects.

3

An Attempt to Use Various Metallurgical Slags in the Modification Processes of Casting Alloys

Sitko Jacek

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 4

1067--1074

EN

The paper presents preliminary results of research on the use of certain smelting slags in the process of modification of casting alloys, leading to a change in the structure of these alloys and improvement of their mechanical and operational properties. The positive effect of ground copper slag with a fraction below 0.1 mm on the effect of modifying the hypoeutectic silumin AlSi7Mg towards changing the morphology of coarse-grained eutectic to fine-dispersive was demonstrated. The modifying effect also applies to the pre-eutectic α phase and results in the formation of additional crystallization sites (nucleation process), which was demonstrated by the thermal ATD solidification analysis, showing an increase in the temperature Tliq and TE max. The positive and noticeable influence of the mixture of copper and steel slag on the surface modifying effect of fragmentation of the structure was demonstrated in casting nickel superalloy IN-713C. Based on the results of research conducted so far on the modifying effect of cobalt aluminate, a hypothetical model of the impact of reduced metallic components of the applied metallurgical slags on the nucleation process and shaping of the microstructure of nickel alloys was developed.

4

Analysis of Performance Processes Material Management

Sitko Jacek

Multidisciplinary Aspects of Production Engineering

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2020

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Vol. 3, Iss. 1

216--226

EN

Regardless of unit production, mass production – an excellent production plan is always expected to combine the exact amount of materials at the right time with production cells and employees. An accurate production plan saves money by reducing production costs and time. It helps to achieve the goal and generate the best production plan. The article addresses the problems of material resource organization in industrial, mining and processing enterprises, affecting production efficiency. Particularly the problems of planning and preparation of unit, serial and mass production in relation to specific products. Depending on the nature of material consumption (basic or auxiliary materials), different planning methods and techniques are used.

5

Analysis of selected technologies of precious metal recovery processes

Sitko Jacek

Multidisciplinary Aspects of Production Engineering

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2019

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Vol. 2, Iss. 1

72--80

EN

The article presents the technologies of obtaining precious metals as a by-product in the processing of copper concentrates in KGHM POLSKA MIEDŹ SA and in the processing of zinc and lead concentrates in Huta Cynku "MIASTECZKO ŚLĄSKIE". Discussed technologies for recovery of silver from secondary raw materials such as: used silver catalysts, scrapped electronic devices, defective transistors, scrap of silver-plated glasses, used solutions used for processing photosensitive materials are discussed. Jewellery and tableware and technical coatings in electronics and electrical engineering. The high reflectivity of the light rays from the silver surface was used in the production of special reflectors and mirrors, and chemical resistance in the construction of apparatus (such as equipment resistant to molten hydroxide alkali metals).

6

Possibilities of pressure die casting of iron alloys

Ružbarský Juraj, Sitko Jacek

Management Systems in Production Engineering

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2019

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nr 4 (27)

199--204

EN

The current trends of production of casts are directed towards production of components disposing of higher accuracy, increased quality of surface and homogenous structure. In case of a thin-walled cast the development of speed of pressing and of pressure was observed inside the mould cavity during pressure die casting of ferrous alloys. In case of die casting of ferrous alloys the attention was paid to life service of a pressing piston and of a filling chamber. The optimal temperature of the steel casting ranges from 1600 to 1750°C and optimal mould temperature ranged from 220 to 260°C. The residues having occurred in gates reached the hardness of 38 HRC and in case of casts the value was of 45 HRC. Influence of acting of resistance pressure on the thinwalled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well. Technology of pressure die casting of iron alloys can be compared with the pressure die casting technology of aluminium alloys. As standard, for pressure die casting the cast irons with carbon content of lower than 3% are recommended.