State of the metallurgy and refractory industry during the coronavirus period

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Recovery of Raw Materials from Ceramic Waste Materials for the Refractory Industry

Products of the refractory industry are key for the production of heavy industry goods such as steel and iron, cement, aluminum and glass. Corresponding industries are dependent on thermal processes to manufacture their products, which in turn would not be possible if there were no refractory materials, such as refractory bricks or refractory mixes. For the production of refractory materials, primary raw materials or semi-finished products such as corundum, bauxite or zircon are used. Industrial recycling of refractory raw materials would reduce dependencies, conserve resources and reduce global CO2 emissions. Today, only a small quantity of the refractory materials used can be recycled because raw materials (regenerates) obtained from end-of-life materials are of insufficient quality. In this study, regenerates from different refractory waste products could be obtained using the innovative processing method of electrodynamic fragmentation. It was shown that these regenerates have a high chemical purity and are therefore of high quality. It could be confirmed that the use of these regenerates in refractory materials does not affect the characteristic properties, such as refractoriness and mechanical strength. Thus, electrodynamic fragmentation is a process, which is able to provide high-quality raw materials for the refractory industry from used materials.

Control of the work quality of chemical and analytical departments of the refractory industry enterprises of Ukraine in 2019

Control of the work quality of chemical and analytical departments of the refractory industry enterprises of Ukraine is one of the activity areas of JSC "The URIR named after A. S. Berezhnoy" and helps to increase the competitiveness of products manufactured by enterprises.The comparison of work quality of chemical-analytical units of refractory enterprises (JSC "KDZ", PJSC "Chasovoyarsk Refractory Plant", JSC "Velikoanadol Refractory Plant") and JSC "The URIR named after A. S. Berezhnoy" was carried out. The discrepancy between the average results of chemical analysis in the chemical-analytical unit of refractory enterprises and in the laboratory of chemical-analytical and structural-phase research of JSC "The URIR named after A. S. Berezhnoy" does not exceed the permissible value of γ in terms of SОU-N МPP 77.080-012:2004. The work quality of chemical-analytical units of central refractory laboratories of all the above mentioned refractory enterprises is satisfactory. Recommendations for improving the accuracy of the chemical analysis results in the refractory enterprises laboratories that participated in the tests are not required.

Interlaboratory comparisons of the results of the work of the chemical­analytical unit of JSC “The URIR named after A. S. Berezhnoy” in 2018

One of the activity areas of JSC “The URIR named after A. S. Berezhnoy” is assistance to refractory industry enterprises of Ukraine in ensuring their work in the quality monitoring of products and raw materials. The comparison of work quality of chemical­analytical units of following enterprises: JSC “KDZ”, PJSC “Chasovoyarsk Refractory Plant”, JSC “Velikoanadol Refractory Plant” and JSC “The URIR named after A. S. Berezhnoy” was carried out. The discrepancy between the average results of components determination in the chemical­analytical units of refractory enterprises and in the chemical­analytical laboratory of JSC “The URIR named after A. S. Berezhnoy” does not exceed the value of in terms of ND. The work quality of chemical­analytical units of central refractory laboratories of all the above mentioned enterprises is satisfactory. Recommendations to improve the accuracy of analysis results are not required. The work on interlaboratory comparison of work results of the chemical­analytical unit of JSC “The URIR named after A. S. Berezhnoy” and IP “SGS Ukraine” was completed. The quality of interlaboratory comparisons carried out between the Testing Centre of IP “SGS Ukraine” and JSC “The URIR named after A. S. Berezhnoy” was found to be satisfactory. The test results were accepted by the NAAU during the next inspection as corresponding to DSTU ISO / IEC 17025:2006.

Refractory Grade Bauxite: An Overview about the Effects of different Bauxite Sources and Forming Processes on the Quality of the Material

Refractories have been very important for humankind development enabling the manufacturing of a wide range of materials. Primary industries demanding refractories include the manufacturing of steel, non-ferrous metals, glass, lime, cement, ceramics, petrochemicals and incineration. Refractory grade bauxites (RGBs) are high-alumina materials used as aggregates in shaped and unshaped refractory linings suitable to with stand high temperature heating and a corrosive environment. Despite the wide availability of bauxite ores in the world, few countries can supply a bauxite with refractory grades. Guyana, China and Brazil have emerged as suppliers for the refractory industry and the peculiarities of each bauxite from these countries impact directly on the refractory performance.

Possibility of obtaining high-alumina materials from industrial wastes of ceramic and refractory industry (Review)

The issues of obtaining aluminum oxide from man-made materials, the issues of differences in the structure, composition and properties of alumina obtained by different technological methods and the issues of providing high-alumina materials to the domestic ceramic, electronic and refractory industries are reviewed.

CONTRIBUTION TO THE KNOWLEDGE OF THE MAGNESITE DEPOSITS IN BOSNIA AND HERZEGOVINA

Magnesite is an industrial mineral of magnesium, which most often occurs in the form of crystalline, massive and amorphous forms. Mineral magnesite has a wide and varied application in the production of high-strength materials: powder (flour), sinter, bricks (magnesite, magnesite-chromite, forsteric, etc.). In the construction industry it is used for the production of magnesium cement. In smaller quantities it is used in chemical, pharmaceutical, rubber and other industrial branches. The area of the so-called "Bosnian Serpentine Zone" are stand out in the area of the inner Dinarides of Bosnia and Herzegovina, among numerous phenomena and larger deposits of magnesite. In terms of quality, the variability from high quality to those that can not be used in the refractory industry is determined. Magnesite deposits mostly require certain preparation procedures in order to achieve higher quality magnesite. The paper presents deposits and the appearance of magnesite in Bosnia and Herzegovina, with emphasis on the results of previous research, quality, reserves, usability and laboratory testing, and the results of the latest X - ray examinations from one site have been presented.