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Year 2000 No 2

Micheľ J., Mihaliková M.
DEGRADATION OF PIPES PROPERTIES IN CREEP CONDITIONS
Keywords: structure|properties|broken|creep|
No 2 (2000), p. 108-115
  mag01.pdf (76 kB)
mag01_eng.txt (2 kB)  

Tomášek K., Vadász P., Rabatin Ľ.
GOLD EXTRACTION FROM THE ELECTRONICAL SCRAP
Keywords: electronic scrap|gold|leaching|electrolyses|
No 2 (2000), p. 116-124
  mag02.pdf (100 kB)
mag02_eng.txt (2 kB)  

Vadász P., Rabatin Ľ., Tomášek K.
SILVER AND PALLADIUM RECYCLING FROM THE SECONDARY RESOURCES
Keywords: palladium|silver|electrolysis|
No 2 (2000), p. 125-132
  mag03.pdf (197 kB)
mag03_eng.txt (2 kB)  

Trišč A., Macanová J., Takáč P.
COAL REACTIVITY EVALUATION FOR BLAST FURNACE INJECTION
Abstract
Blast furnaces cover major volume of hot metal production. There is a world wide tendency to inject pulverized coal through the blast furnace tuyere. The principal aim of the blast furnace plants has become a maximization of pulverized coal injection rate. Therefore it is very important to find a suitable coal which enable it. Combustion efficiency of the pulverized coal depends on various parameters, e.g. blast temperature, oxygen enrichment of the blast, blast humidity, features of the pulverized coal ( volatile maters contents, combustibility, particle size...). It was find out at high pulverized coal injection rate the incombusted not utilized particles of char and carbon black are conducted away from furnace in waste gases.
The aim of this work was to obtain knowledge about pulverized coal reactivity, injected in VSZ a.s. Kosice. From some sorts of black coals the samples of the char in nitrogenous atmosphere at temperature 1000°C were prepared. The sample of the brown coal was prepared, too. Subsequently, the samples were pulverized and screened at three size fractions. Reactivity test was carried out in carbon dioxide atmosphere at temperature 1000°C. The reactivity index was expressed as amount of the combusted carbon up to the twentieth minute of the experiment. It is probably possible by this test to predict of the behavior of noncombusted char particles in reduction area of blast furnace. The results show, the char reactivity from black coal has different values and the char reactivity from brown coal is much higher. The new coal mix for blast furnace injection was proposed.

Keywords: pulverized coal injection|blast furnace|reactivity|char|combustion efficiency|
No 2 (2000), p. 133-141
  mag04.pdf (208 kB)
mag04_eng.txt (2 kB)  

Rodziňák D., Dudrová E., Kabátová M.
FATIGUE PROPERTIES OF SINTERED IRON AND SINTERED STEEL DISTALOY AE+0.7C AFTER DEFORMATION AND COPPER INFILTRATION
Keywords: Powder metallurgy|fatigue properties|deformation|infiltration|microstructure|
No 2 (2000), p. 142-150
  mag05.pdf (214 kB)
mag05_eng.txt (1 kB)  

Mayer P.
DIAGNOSIS OF CORROSION PROBLEMS IN UNDERGROUND ELECTRICITY DISTRIBUTION EQUIPMENT
Keywords: underground corrosion diagnosis/protection|electricity distribution|buried equipment|expert system|
No 2 (2000), p. 151-163
  mag06.pdf (128 kB)
mag06_eng.txt (923 B)  

Šoltés M., Havlík T.
NON-FERROUS HYDROMETALLURGY - INFORMATION DATABASE
Keywords: hydrometallurgy|leaching|non-ferrous metal sulfides|computer database|scientific information|
No 2 (2000), p. 164-170
  mag07.pdf (155 kB)
mag07_eng.txt (2 kB)  

Havlík T., Popovičová M.
USE OF MICROWAVE ENERGY FOR NON-FERROUS HYDROMETALLURGY
Keywords: hydrometallurgy|microwave energy|mechanism|leaching|chalcopyrite|
No 2 (2000), p. 171-177
  mag08.pdf (208 kB)
mag08_eng.txt (1 kB)  

Sinka V.
SEMI-SOLID METAL FORMING - MICROSTRUCTURAL DEVELOPMENT
Keywords: semi-solid metal forming|thixotropy|partial remelting|globularization|
No 2 (2000), p. 178-182
  mag09.pdf (146 kB)
mag09_eng.txt (1 kB)  

Vítek V.
STUDY OF POSSIBILITIES FOR FLOWING SOLUTION IN FURNACE WORKING SPACE WITHOUT NEED TO SOLVE THE SYSTEM OF PARTIAL DIFFERENTIAL EQUATIONS
Keywords: industrial furnaces|flowing|modelling|zonal models|
No 2 (2000), p. 183-190
  mag10.pdf (158 kB)
mag10_eng.txt (1 kB)