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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
Abstract
Various types of the extractive technologies for the treatment of the separated electrotechnic gold scrap in the laboratory scale were tested and verified. Separated electrotechnic scrap is mainly represented by various types of contacts from the electric and electronic devices and apparatuses. As a basic material of the body of these contacts is most frequently used copper alloys for example different types of brasses and bronzes. Contact layer is presented by galvanically coated gold surface. Gold content in such separated contacts is usually up to 1 wt. %, copper content approximately 75 - 80 wt. %.
Three leaching solutions were tested on the extraction efficiency of gold in the first part of this work. As leaching solution were mixture of inorganic acids, aqueous solution of thiourea and aqua regia used and obtained results were discused. A treatment of separated electric gold-coated contacts by electrochemical process is suggested, described and verified in the second part of this paper. This methode is based on the two - steps electrolysis, the first step is copper electrolysis and the second step is gold electrolysis.
There were verified, that it is possible Cu - electrolyses the metallic copper with 98,12 % purity with 85 % recovery. During Cu-electrolyses the gold is concentrated in anode slime. The anode slime is smelting and casting the Au/anodes from which is possible, by Au - electrolysis, to obtain gold with 99,99 % purity and 99,74 % recovery. Presented technology is possible to use also for another types of separated electric and electronic scrap with gold and copper content.

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
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)