Tina Ujevica 25

Sisak, Croatia

Tina Ujevica 25

Sisak, Croatia

Time filter

Source Type

Sofilic T.,CMC Sisak D O.O | Merle V.,CMC Sisak D O.O | Rastovcan-mioc A.,University of Zagreb | Cosic M.,CMC Sisak D O.O | Sofilic U.,Tina UjevicA 25
Archives of Metallurgy and Materials | Year: 2010

Even though electric arc furnace (EAF) steel slag has been classified as non-hazardous waste by its physical and chemical characteristics, and is possible to be disposed of at provided disposal sites without danger to the environment, this is rarely applied, because the permanent disposal of steel slag is highly expensive and requires a great area, and the valuable ingredients of steel slag are lost forever. The purpose of this paper was to improve the management of this type of non-hazardous industrial waste. Alongside with reducing the area intended for its disposal and increasing the technological benefit of re-using waste material, the final results of these tests should ensure the economic profit of producers, as well as achieve a sociological-ecological benefit due to the reduction of expenditure of natural mineral aggregates, simultaneously enhancing the sustainable development policies in metallurgy. A part of this research examines the possibilities of using EAF slag in other industries, with a special focus on using the slag as substitute for natural mineral aggregates in the production of asphalt mixtures in road construction. The paper presents the results of testing physical and mechanical properties of EAF slag coming from the regular production of unalloyed carbon steel in CMC Sisak, Croatia with the application of prior processing encompassing cooling the liquid slag by air, as well as quenching by water, grinding, magnetic separation, fragmentation and granulometric fractioning for the purpose of its application in technologies of producing asphalt mixtures. Comparison of test results between specimens of water- and air-cooled EAF slag and natural aggregates used in asphalt mixtures on highways and other top-class traffic load roads has demonstrated that the examined slag has equally good physical and mechanical properties, while it is significantly better in terms of resistance to polishing.


Sofilic T.,CMC Sisak D.o.o | Barisic D.,Ruder Boskovic Institute | Rastovcan Mioc A.,University of Zagreb | Sofilic U.,Tina Ujevica 25
Journal of Radioanalytical and Nuclear Chemistry | Year: 2010

The objective of this study was to describe the radiochemical characteristics of electric arc furnace (EAF) slag from Croatian EAF black steel slags, generated from carbon steel production process in CMC Sisak d.o.o., and steel mill in Split in order to enhance the understanding of possibilities for their use in road construction. This article presents the results of radionuclide in electric arc furnace steel slag. The presence of natural isotopes 40K, 232Th (228Ra), 226Ra and 238U was established. The measured activity in slag natural isotopes lies within the Croatian legally permitted limits. © 2009 Akadémiai Kiadó, Budapest, Hungary.


Sofilic T.,CMC Sisak D.o.o. | Rastovcan-Mioc A.,University of Zagreb | Cosic M.,CMC Sisak D.o.o. | Merle V.,CMC Sisak D.o.o. | And 2 more authors.
Chemical Engineering Transactions | Year: 2010

This paper demonstrates the results of testing basic physical and chemical properties of steel slag generated in the steel mill of CMC Sisak d.o.o., Croatia, with the purpose of its characterization as the type of waste, i.e. by-product intended for recycling in other industries. Special attention has been directed at investigating the possibilities of it being used as substitute for natural mineral aggregates when producing asphalt mixtures. The results which were obtained by testing geometric, physical-mechanical properties, as well as the properties of duration on the specimen of electric arc furnace steel slag, have satisfied the conditions for manufacturing mixtures of the tested steel slag and natural aggregate which can be used in asphalt production. In comparison to the natural carbonate and silicate aggregates which are used in asphalt mixtures on highways and roads with heavy traffic, the examined steel slag has equally good physical-mechanical properties. Within the framework of this project, test fields have recently been constructed. The existing wearing course was replaced by an AC 11 type of asphalt, in one lane with conventional natural carbonate aggregate and in the other two lanes with slag aggregate from CMC Sisak (0/4, 4/8, 8/11). The results of measurements of skid resistance on the section constructed using natural aggregate, and the section made using steel slag aggregate, were comparable. By means of laboratory analyses and in situ monitoring it should be possible to prove that asphalt composites containing slag have sufficient durability, and can achieve and maintain the required surface characteristics for road traffic safety. Copyright © 2010, AIDIC Servizi S.r.l.


Sofilic T.,CMC Sisak D.o.o. | Barisic D.,Ruder Boskovic Institute | Sofilic U.,Tina Ujevica 25
Journal of Radioanalytical and Nuclear Chemistry | Year: 2010

This article presents the results of 137Cs and other radionuclide monitoring in EAF steel-making process in the Croatian CMC Sisak Steel Mill. The presence of 137Cs and natural isotopes 40K, 232Th, 226Ra and 238U was established. Investigations on the occurrence of the isotope cesium, as well as natural isotopes and their distribution in waste from the process of carbon steel production by EAF have been conducted. Detection of artificial isotope cesium in EAF dust indicates that it might originate from steel scrap or from the residue of the material that was used in the technological process, thus deserving special attention. © 2010 Akadémiai Kiadó.


Sofilic T.,CMC Sisak D.o.o. | Mladenovic A.,Slovenian National Building And Civil Engineering Institute | Sofilic U.,Tina Ujevica 25
Chemical Engineering Transactions | Year: 2010

The use of industrial by-products requires knowledge of the characteristics of the materials. This paper presents characterization data on slag generated in the melting of steel scrap by electric arc furnace (EAF). Characterization of electric arc furnace slag (EAFS), as one of the most significant types of non-hazardous metallurgical waste, was carried out through an examination of its physical and chemical properties with special emphasis on chemical and structural characteristics and potential use in road construction. Croatian EAF black steel slag, generated from carbon steel production process in CMC Sisak d.o.o., is the most interesting from the asphalt technology point of view, but in order to assess the suitability and reusing potential of EAFS in asphalt mixture production, it is necessary to know its chemical, radiochemical, physical, morphological, mineralogical, and textural characteristics, as well as how it interacts with individual segments of the environmental system. For this purpose, the study was carried out using several different analytical methods and this paper aims to explore the feasibility of utilizing steel slag as aggregates in asphalt mixtures. Optical Microscopy (OM), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDS) were employed to study the texture, morphology and composition of steel slag. Tests on the soundness of the slag for use as aggregate in road construction were carried out in accordance with European standards. Copyright © 2010, AIDIC Servizi S.r.l.


Sofilic T.,CMC Sisak D.O.O | Barisic D.,Ruder Boskovic Institute | Sofilic U.,Tina Ujevica 25
Archives of Metallurgy and Materials | Year: 2011

Present day steelmaking slags are being successfully used as a high quality mineral aggregate for the building industry. With this, it is of vital importance to be familiar with the technical significance of the secondary application of steel slag, because some steel slag might contain increased concentration of substances harmful to human health. In terms of steel slag impact on the environment, radionuclides are the least researched of all pollutants emitted from the metallurgical processes. This paper presents the results of radiochemical testing of steel slag and steel slag aggregates for the purpose of its use in the production of construction material. Obtained results of measurements show that 40K, 226Ra and 232Th in all examined steel slag samples have the activity concentration from 45.3 to 62.9Bqkg-1, 15.2 to 21.4Bqkg-1 and 12.9 to 15.4Bqkg -1, respectively. Results of measurements of radionuclide activity concentrations of 226Ra, 232Th and 40K in slag aggregates show similar values for all radionuclides ranges as follows: 40K from 14.1 to 23.3Bqkg-1; 232Th from 8.6 to 14.4Bqkg-1 and 226Ra from 14.8 to 26.8Bqkg-1. Activities index (11, 12, 13) of 226Ra, 232Th and 40K were compared with values recommended by Croatian legislation. Radium equivalent concentrations (Raeq) of 226Ra, 232Th and 40K for examined steel slag and steel slag aggregates are harmounious with the results presented by other authors for the same by-product. The testing has been conducted on steel slag created during the production of carbon steel by electric arc furnace in Steel Mill of CMC Sisak, Croatia.

Loading Tina Ujevica 25 collaborators
Loading Tina Ujevica 25 collaborators