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Year 1999 No 3

Ďurišin J., Kyseľová K., Ďurišinová D.
ANALYSIS OF CARBON IN MOULDING POWDERS AND STEEL STRIPS
Abstract
Carbon is a significant constituent of the moulding powders which play important role in the continuous steel casting procedure. Carbon is the most frequently used substance to regulate the melting rate of the moulding powders. Its increasing content decreases the melting rate. Besides the determination of the total carbon content the knowledge of its individual forms and their portions is of significant importance. The main aim during monitoring the quality of moulding powders is to determine both total carbon content and the content of free carbon.
At present, LECO RC-412 can be regarded as the top quality equipment among the equipment suited for the above mentioned tasks. The development of the methods for the analysis both total carbon content and its forms using LECO RC-412 was focused on analysis of total and free carbon content in the moulding powders and analysis of the carbon content in the surface layer of steel strips as well as for the analysis of the residual carbon content in the core of steel strips.
For the analysis of free carbon various temperature programs with monitoring of kinetic of the sample decomposition - namely decomposition of its individual phases - were verified and compared with the results of analyses carried out by Ströhleine method. In addition, the analyses of the input materials which are the constituents of the moulding powders were carried out using LECO RC-412 equipment and compared with the results of the analyses of pure chemicals or individual phases.
The optimized temperature programs of the LECO RC-412 equipment for the analyses of carbon content in the MOLD type moulding powders are in accord with the parallel control analyses carried out by the "classical" way. Therefore it is highly recommendable to employ the above equipment for the rapid "operational" analyses because of its higher precision and it is also less time consuming analytical method in comparison with the other kind of analyses.

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No 3 (1999), p. 165-171
mag01_eng.txt (2 kB)  

Jandová J., Prošek T., Maixner J.
LEACHING OF ZINC OXIDE IN AQUEOUS SULPHURIC ACID SOLUTIONS
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No 3 (1999), p. 172-183
  mag02.pdf (226 kB)
mag02_eng.txt (931 B)  

Krakovská K., Remeteiová D.
TUNGSTEN ATOMIZER - STUDY OF ATOMIZATION REACTIONS OF SOME VOLATILE ANALYTES
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No 3 (1999), p. 184-194
  mag03.pdf (191 kB)
mag03_eng.txt (2 kB)  

Pokorný I.
NUMERICAL SOLUTION OF STRESSES IN THE ROLLING GAP - ONE-DIMENSIONAL CASE
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No 3 (1999), p. 195-201
  mag04.pdf (116 kB)
mag04_eng.txt (861 B)  

Varga A., Onuška D.
INFLUENCE OF ADDITIVE GRANULOMETRY ON DESULPHURIZATION PROCESS IN BOILERS WITH SUPERPOSED FLUIDIZED REACTOR
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No 3 (1999), p. 202-207
  mag05.pdf (160 kB)
mag05_eng.txt (2 kB)  

Havlík M., Vadász P., Fedor J.
APPLICATION OF STATISTIC MODEL OF IONIC MELTS ON ACTIVITY CALCULATION IN SYSTEM
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No 3 (1999), p. 208-212
mag06_eng.txt (799 B)  

Sinka V.
SEMI-SOLID METAL FORMING - RHEOLOGICAL CONCEPTS
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No 3 (1999), p. 213-218
  mag07.pdf (193 kB)
mag07_eng.txt (1 kB)