Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2009
Volume
R. 33
Number
Nr 4
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 33 (2009)
Projects
Pages
Articles
Briquetting of Rosetta ilmenite ore with different organic binder and its reduction in hydrogen in the temperature range of 800÷1200 degrees of Celsius
(Wydawnictwa AGH, 2009) Abd el-Gawad, Hala H.; El-Hussiny, Naglaa A.; Wassf, Marguerite A.; Kalifa, Mohamed G.; Iskander, Berlanty A.; Shalabi, Mohamed el-Menshawi H.
Fine grained ilmenite ore was briquetted with different amounts of molasses or pitch and pressed under different values of pressure was studied in this investigation. The results show that optimal amount of added molasses and pitch were 1.5%, the pressure was fixed to 294.3 MPa. Furthermore, the characteristics of raw materials was examined by different methods of analysis, such as x-ray and screen analysis. The produced briquettes were then reduced by different amounts of hydrogen by different temperatures and the reduction kinetics was determined.
Wpływ zakłóceń procesu wzbogacania węgla w osadzarce na zmiany gęstości rozdziału - badania laboratoryjne
(Wydawnictwa AGH, 2009) Cierpisz, Stanisław; Kowol, Daniel
Results from testing the impact of selected types of disturbances in washing process in a jig on changes of separation density were presented in the paper. It was proved that change of separation density, caused by variability of characteristics of coal washing ability, is significant and increases with an increase of height of the float. It was also found that readings of float sensor, at assumed constant process conditions, are disturbed, what can result in changes of separation density. Fluctuations are small and they can be reduced by a suitable filtration of measuring signal. The conducted tests also indicated that inertia of float, that depends on its geometrical dimensions of float, can have an impact on rapidity of reaction to changes of bed density distribution or set float density.
Factors affected the performance of fire clay refractory bricks
(Wydawnictwa AGH, 2009) Elngar, Marwa A. G.; Mohamed, Fatma M.; El-Bohy, Salwa A. H.; Sharaby, Carmen M.; Shalabi, Mohamed el-Menshawi H.
In this investigation some factors affected the performance of the fire clay refractory bricks such as size of grog, percentage of water added to the raw material, percentage of grog and temperature of firing were studied. The results showed that if the percentage of grog increased the shrinkage of bricks decreased, as well as density of bricks was increasing the porosity and water absorption also increased. Furthermore, with increasing of the added water to the raw material the porosity of the bricks increased and if water absorption increased, density decreased. The characteristics of raw material by such methods as x-ray and chemical analysis were also examined.
Bacterial decontamination of soil from Ostrava Airport
(Wydawnictwa AGH, 2009) Fečko, Peter; Tora, Barbara
The paper deals with an examination of possible application of biodegradation in the decontamination of soil samples from Leos Janacek's Airport in Ostrava. Soils samples were used for laboratory tests of biodegradation taken from oil interceptors. The laboratory biodegradation tests were carried out with a pure bacterial culture of Pseudomonas putida, a pure laboratory culture of Rhodococcus sp., their mixture and a mixture prepared combining their media free of bacteria. The results of the paper imply that for the given purpose, i.e. for biodegradation of airport pollutants, it is most suitable to apply a mixed bacterial culture of Pseudomonas putida and Rhodococcus sp. The results of the paper show that the biodegradation method is applicable for the pollution in question.
Wybrane problemy bilansowania produktów wzbogacania rud miedzi
(Wydawnictwa AGH, 2009) Foszcz, Dariusz; Niedoba, Tomasz; Tumidajski, Tadeusz
The adequate evaluation of feed separation into concentrate and waste is the crucial problem of mineral processing. The paper presents the analysis of copper ores, originating from Legnica and Głogów copper deposit area, beneficiation products balance. The errors of yields determination, which are the effect of improper sample collections, inexactness of chemical analyzes, as well of errors being the effect of products arising time shifts (which can be the highest ones) were taken into consideration. As the measures of the direct errors of chosen product yield estimation, the gradient vectors and its quadratic errors given by total differential method were applied. Then, by Grumbrecht method, the mean values of yields for the balanced period were calculated for minimization of the sums of increments Delta alpha, Delta betha and Delta v. The given results were compared and evaluated"," some of the possibilities of metal production calculations in industrial conditions were discussed.