Silvie Brozova

Silvie Brozova
VSB - Technical University of Ostrava · Department of Non-ferrous Metals, Refining and Recycling

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65
Publications
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366
Citations

Publications

Publications (65)
Article
Full-text available
New energy generation methods are currently being discussed with a view towards the transition from traditional primary sources to more environmentally friendly options, particularly renewables. Energy storage is also closely related to this transition. Battery storage currently dominates this area. However, flywheel energy storage system technolog...
Article
Full-text available
The manuscript explores the feasibility of recovering zinc and iron from waste galvanic sludge generated during galvanic plating processes. Galvanic sludge, characterized by elevated concentrations of heavy metals, represents a suitable candidate for hydrometallurgical recycling. The primary objective of the experimental and practical phases was to...
Preprint
Full-text available
New ways of generating energy are currently being discussed, with a transition from traditional primary sources to more environmentally friendly options, particularly renewables. Energy storage is also closely related to this transition. Battery storage currently dominates this area. However, flywheel energy storage system (FESS) technology offers...
Article
The simulation of mass motion using a vibrating device that was laboratory designed was the main idea of the work. The construction of an experimental vibrating device and the associated measuring station along with the measurement of dynamic properties of the vibrating device depending on preselected input parameters of the device of bulk material...
Conference Paper
The paper deals with the possibility of obtaining zinc and iron from waste galvanic sludge, which arises during galvanic plating. Galvanic sludges, which contain more significant amounts of heavy metals, form wastes that are suitable for recycling. These arise during the treatment of wastewater from the operation of the electroplating plant. It is...
Article
Full-text available
This paper deals with the possibility of obtaining zinc from waste galvanic sludge, which is formed during galvanic plating. The aim of the experimental and practical part was to obtain zinc after the leaching of galvanic sludge. Leaching was performed in sulfuric acid, nitric acid and hydrochloric acid at different temperatures and time intervals...
Article
Full-text available
Today, Ni-Cr steel is used for advanced applications in the high-temperature and electrical industries, medical equipment, food industry, agriculture and is applied in food and beverage packaging and kitchenware, automotive or mesh. A study of input steel powder from various stages of the recycling process intended for 3D printing was conducted. In...
Chapter
The chapter focuses on the economical use and reuse of battery materials. The core of the chapter is devoted to battery materials and the full cycle from battery research through production, with discussions about starting materials, production effects, and the fate of materials after their utilization. The effects of harmful substances on the envi...
Article
Full-text available
The paper presented the findings obtained by industrial research and experimental development on the use of rare earth metals (REMs) in the production of heavy steel ingots and their impact on the internal quality of the 42CrMo4 grade steel forging. REMs alloying was carried out after vacuuming the steel. A relatively large melting loss of cerium (...
Article
Effects of Cerium (Ce) addition on solidification structure of a low-carbon 42CrMo4 steel was investigated. The addition of up to 0.067 wt.% of Ce in the steel produced greatly improved solidification structure with a suppressed columnar grain zone, finer grain size in an equiaxed grain zone and zero area fraction of casting shrinkage cavity. The a...
Article
Full-text available
Printed circuit boards (PCBs) can be an important source of non-ferrous metals (Al, Sn, Zn, and Ni) and precious metals (Au, Ag, Cu, and Pd). With the continuous increase in demand for metals due to the depletion of ores, recycling of this waste is becoming an attractive alternative. The printed circuits also contain hazardous metals, such as Pb, H...
Article
Full-text available
The enrichment of the society and the consumptive lifestyle caused that customers buy more and more, having different, often very high requirements as to the purchased products and services. They often do not realize that production of such products requires more and more materials, energy and other means of production. All this leads to high explo...
Article
Full-text available
The polyamide (PA)-12 material used for additive manufacturing was studied in aspects of morphology and their structural properties for basic stages received during 3D laser printing. Samples were real, big-scale production powders. The structure of polymer was evaluated from the crystallinity point of view using XRD, FTIR, and DSC methods and from...
Article
Full-text available
The development of e-commerce and communication technologies has allowed changes in the traditional trading system, currently customers can use both stationery shops and e-shops. People no longer need to leave their homes to go shopping, even everyday groceries. They can use the e-shop at any time of day or night, at home or at work. There are no q...
Article
Full-text available
Customers are more and more deciding to use various types of services via Internet. They make very often different types of purchases. E-commerce is becoming more and more popular and developed. Unfortunately, according to customers, online shopping is not free from problems. Customers are afraid that the ordered goods will not be sent to them, wil...
Article
Full-text available
This paper describes interesting operational experiments have been performed in the scope of the project where the process of melting deoxidation was used under improvised conditions of cold blast cupola furnace. The goal was to find out metallurgical effects of added selfreducing briquettes prepared from steel sludge into cupola furnace charge and...
Article
Full-text available
Steel is currently main structural material in the world. Pig iron, which is the basic product of blast furnace process, is the semi-product used in steel-making processes. It is an alloy of iron with carbon containing above 2% C and other elements with limited content, intended for further processing. Chemical composition of pig iron is its basic...
Article
Full-text available
In the paper the evaluation of efficiency of the use of machines in the selected production company was presented. The OEE method (Overall Equipment Effectiveness) was used for the analysis. The selected company deals with the production of tapered roller bearings. The analysis of effectiveness was done for 17 automatic grinding lines working in th...
Article
The article deals with a sophisticated approach to the study of basic kinetic dynamic process in metal production. It is concerned with three agendas: study of reduction reactions of iron oxides and carbon as reducing agents with secondary created oxides; study of the effect of catalyst occurrence on the reaction space; study of the effect of varia...
Article
Full-text available
The paper dealt with research on structural properties of metallurgical sinter. It was aimed at studying of sinter porosity and density in relation to its reducibility. For porosity determination was used immersion technique using Archimedes principle. Density was measured by gas pycnometer and apparent density was calculated from results of measur...
Chapter
This chapter deals with possibilities of mathematical modeling of blast furnace operation. This chapter summarizes various attitudes for evaluation of blast furnace operation. The chapter is aimed at modeling of kinetics of reduction processes. It presents a methodology developed at VŠB-Technical University of Ostrava-for interpreting of laboratory...
Article
Full-text available
The work is focused on evaluation of resistance of the welded joint made of supermartensitic 13Cr6Ni2.5Mo stainless steel to sulfide stress cracking. Testing method A and solution B in accordance with NACE TM 0177 were used. All the testing samples were ruptured in a very short time interval but welded joint samples were fractured primarily in the...
Chapter
Full-text available
The chapter deals with determination of possibilities in energy consumption decrease. It presents a comparative analysis of energy consumers' behavior. It compares Czech and Polish consumers' habits in electricity usage at households and in workplaces. There are presented results of research conducted in 2014 in Poland and Czech Republic. It was ai...
Article
The influence of rare earth metals (REM) addition on solidification structure of the low-carbon 42CrMo4 steel was investigated. Alloys were prepared by means of a centrifugal casting. The addition of cerium, praseodymium or mischmetal in the steel produced greatly improved solidification structure with a suppressed columnar grain zone, finer grain...
Article
The paper deals with a possibility of zinc and cobalt extraction from refuse after sphalerite mineral leaching. It contains theoretic analysis of hydrometallurgical processes. Practical part describes samples and their leaching in 10% and 20% sulphuric acid. In the end of the paper it is evaluated under which conditions the highest yield of zinc an...
Article
A general trend in steelmaking industry is to increase strength, resistance to brittle fracture and fatigue properties of steel products at favorable price. Achieving fine-grained microstructure during austenite to ferrite transformation is a basic prerequisite to improve the mechanical properties. The desired transformation can be achieved in seve...
Article
Full-text available
The results of an experimental study on influence of cerium addition on structural characteristics of 42CrMo4 steel are presented. Alloying with cerium was carried out using profile filled with powdered mixture of mischmetal. The samples were taken from two ingots cast in the VHM's steelworks with standard time of casting of about 14 minutes. Three...
Article
Theoretical and experimental study on influence of addition of selected non-ferrous metals and mischmetal on microstructural characteristics in special Cr–Mo steels were performed. A number of binary iron-admixture systems were theoretically studied and equilibrium distribution coefficients were recently computed. Cast samples of Cr–Mo steel with C...
Article
The paper deals with possibilities of improvement of iron making technology in economic point of view. The optimization of blast furnace feedstock is one of approaches how to reach it. The paper focuses on blast furnace feedstock properties. It devotes to blast furnace reducibility which is an important characteristic which determines the whole pro...
Article
In the context of economic changes is to highlight the demand for new, alternative ways of recycling materials. Also currently rising raw material prices and demand for cheaper raw materials that could suitably replace the existing one. One area of current interest is waste management. Especially in our region is the issue of recycling and reuse of...
Article
The manufacturing program of the company VÍTKOVICE HEAVY MACHINERY a.s. comprises production of a wide range of structural steels for the high exposed machine parts, such as shafts of wind power stations, turbine shafts, gears, etc. Due to the ever increasing demands of customers to increase the service properties of steel while maintaining the rea...
Article
Recycling of metals from secondary sources is a growing industry. Metals are a renewable resource. Most metals are used in industry in a fairly massive elemental form, which greatly facilitates recycling. In the field of metallurgy Czech Republic belongs to typical processing countries without their own resources of raw materials. The use of metall...
Article
This work represents preliminary metallurgical testing of the plasma equipment for recycling metal-bearing wastes. It is concentrated on determination of energy budget of experimental heats, measurement and record of chosen parameters , heat losses, efficiency of plasma energy transmission, interaction of metal smelt and slag former, technical docu...
Article
Czech Republic is one of the typical process states without their own raw material resources. Production of pig iron requires a piece of the charge – lump iron ore or metal-bearing material (from agglomeration and pelletization) and metallurgical wastes. Ecological recovery and recycling of metallurgical waste is an increasingly important factor no...
Article
The paper deals with mathematical models developed at Centre ENET, VŠB – Technical University of Ostrava. It is aimed at a model simulating blast furnace operation. The model has three parts. The first one calculates kinetic constants of iron raw materials reduction in blast furnace aggregate. The second used it for a simulation of iron oxides redu...
Article
In the Czech power distribution network, control and operating of reactive power are realized parallel to this distribution network. From the technical point of view of network operation, it is a matter of reactive power use of sources operated in the network with regard to the energy quality, economic efficiency and safe operation of network. Lega...
Conference Paper
Problems of electric and electronic devices whose lifetime have finished is a very discussed question abroad as well as in the Czech Republic during several recent years. Technical development in this field is continuously going forward very quickly. Majority of equipments and devices getting older only a little are replaced by new ones. It is impo...
Article
The paper analyses details for renewal of the research in blast furnace process within Research Centre ENET at VŠB - Technical University of Ostrava. A newly established laboratory for reducibility testing is an impuls to overcome the former limits and renew a research in its coherence after years. The paper deals with the possibilities of optimiza...
Article
Above all, existing blast furnace production comes about through innovations in the area of injection of alternative fuels as a partial substitute for metallurgical coke. These fuels have one common aspect; when they are used in metallurgical based industries, the hydrogen content in reducing gas is significantly increased. For variant calculations...
Article
Ninety-eight percent of the pig iron produced in the world is made in blast furnaces. Pig-iron smelting is presently being impacted by a serious shortage of coking coals. Moreover, the production of coke used in the smelting operation has an adverse effect on the environment. One method of partially replacing coke in the smelting operation is to in...
Article
The paper deals with possibilities of energy exploitation of industrial waste. At the beginning, it sums up the advantages of energy treatment of the waste. It presents recent survey of industrial waste production according the region in the Czech Republic. It describes the technologies of energy waste exploitation. The main part of the paper is co...
Article
In connection with the implementation of EU directives is necessary to make use of renewable energy sources. The use of these energy sources is associated with the obligation to act in accordance with the sustainable development concept. In Poland, this concept is provided in Art. 5 of the Constitution of the Polish Republic. In the article it was...
Article
The extremely large energy requirements of blast-furnace iron production and the high levels of pollution in terms of carbon dioxide have resulted in systematic efforts aimed at decreasing the specific consumption of fuels and deoxidizing agents during this process. This paper deals with the injection of alternative fuels into a blast furnace and t...
Article
Coal is the biggest source of fossil carbon on the Earth and its share in world consumption of primary energy sources is 23,5%. Nowadays, there has been reopened the question of coal bed mining in Frenstat, Czech Republic. In case of initiation, the gas is possible to use as a natural gas alternation for an alternative pig iron production such as D...
Article
At present the waste from iron- and steelmaking finds hardly applicability as secondary raw material. Evidence has been given that the low-temperature plasma could replace the existing routes of less-suitable pyrometallurgical treatment of such wastes that are therefore processed by hydrometallurgical route. As the metallurgical and technological f...
Article
Full-text available
Abstrakt The production of primary metals contributes about 5% to total world greenhouse gas emissions, and of this, iron and steel production accounts for about 70%. Global CO 2 emissions increased from 15,3 billion tonnes to 31,5 billion tonnes. This represents an increase of 41% since 1990. For the first time, the share of global CO 2 emissions...
Article
Full-text available
The Czech Republic represents a country with a developed steel industry which constitutes a basic for advanced machine engineering. The concentration of iron and steel production in modern plants creates an advantageous condition for the implementation of new technologies. An emphasis is particularly laid upon the power demand of primary metallurgi...

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