Browsing by Author "Tajchman, Zbigniew"

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Access status: Open Access ,
Badanie możliwości utylizacji pozostałości po recyklingu odpadów szklanych w produkcji kruszywa piaskowcowego
(Wydawnictwa AGH, 2010) Nowak, Alicja; Tora, Barbara; Tajchman, Zbigniew; Peszko, Barbara
Glass recycling uses less energy than manufacturing glass from sand, lime and soda. Every metric ton of waste glass recycled into new items saves 315 additional kilograms of carbon dioxide from being released into the atmosphere during the creation of new glass. Glass wastes, which can be recycled not are allowed to contain: monitors, window glass: car glass, mirrors, lamps, crystal articles, ceramics, glass decorative units, ceramic waste of china, breakage, soil, metals, glass from kinescope lamps. The results of investigations were introduced over possibility of utilization of glass wastes which can not be used as standard glass breakage. The proposal of residue of glass waste recycling as sandstone aggregate compound was tested.
Access status: Open Access ,
Badanie zależności podatności na mielenie od wybranych parametrów węgla kamiennego
(Wydawnictwa AGH, 2010) Tora, Barbara; Fečko, Peter; Nowak, Alicja; Tajchman, Zbigniew
One of the characteristic of coal which is important in energetic is coal grindability - use of energy needed for milling. This paper focuses on investigation of dependence of coal physicochemical characteristics on grindability (Hardgrove index). 21 samples from Poland, Czech Republic, Russia and Colombia were examined. It was noticed that grindability depends only for coal which origin from one deposit.
Access status: Open Access ,
Regresyjny model procesu klasyfikacji ziaren skrajnie drobnych
(Wydawnictwa AGH, 2009) Tajchman, Zbigniew
The paper presents the issues relied to the description and the basic technological factors of flowing classification process, which main medium were suspensions of chosen model materials ultra fine particles. After conduction of basic process factors evaluation, which originated mainly from the Tromp curve, the ones seemed to be the most appropriate to evaluate the process were chosen for the further research. Three model materials were selected: quartz glass; quartzite; barite. Furthermore, three changeable parameters of flowing classification process conduction were chosen, which were: temperature; volumetric concentration of the suspension; concentration of hydrogen ions of process conduction environment. The results of chosen process parameters significant influence on elementary phenomena occurring during particles (of sized up to 60 mim) separation process were presented, as well the results of viscosity and suspension stability. The described state of elementary phenomena recognition being the part of classification process determines unequivocally the state of models construction of this process. Their general feature is deterministic approach joined with introduction of significant simplifications. This is caused mainly by lack of many elementary phenomena measuring possibilities during the process conduction. The constant coefficients introduced to the equation, which, however, do not allow the unequivocal interpretation of all of the phenomena occurring during the classification process. This do not solve the complexity of the problem because the random interactions should be considered in process description. The randomness of the process causes many difficulties in determination of correlations between individual elementary phenomena and also in precise identification of full group of factors influencing on course and results of the process. Only in recent years, the random interactions are introduced in various range to existed deterministic process models.
Access status: Open Access ,
Wpływ zmiennych fizyko-chemicznych parametrów środowiska na agregację ziarn drobnych w procesie klasyfikacji
(Wydawnictwa AGH, 2010) Tajchman, Zbigniew
In an ideal deterministic flowing determination process model, many assumptions are introduced, what often results in impossibility of determination a priori characteristics of the process. In classical process theory, the behavior of a single, separated circular particle is considered, without taking into account the interactions between particles themselves, as well particles and classifier walls. That makes the interpretation of the results determined for single particles as the results for their set inadequate. The paper presents what is the influence of hydrogen ions concentration changes in environment where the elutriation process occurs on the values of electro-kinetic potential on the basis of the materials. The changeable values of the suspension pH, influence significantly on the ability of finest particles coagulation aggregation, so on classification results.