Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2006
Volume
R. 30
Number
Nr 3/1
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 30 (2006)
Projects
Pages
Articles
Efektywność procesu rozdziału w osadzarce
(2006) Brożek, Marian; Surowiak, Agnieszka
Terminal settling velocity of particle is an argument of separation in jigging process. Terminal velocity is dependent on physical and geometrical properties of particle. Therefore precision of separation will be dependent on distribution of physical and geometrical properties of particles in the feed. This article presents the results of testing of the industrial jig. After division of separation products on narrow size fractions-density fractions, the terminal velocity of particles were calculated. Knowing the yields of narrow size-density fractions the partition curves for two cases were drawn: in first when the terminal settling velocity of particle is an argument of separation and second when as an argument is density of particle. Accuracy of separation determined by probable error is greater for the first case.
Odpadowe muły węglowe jako element izolacji mineralnej składowisk odpadów
(2006) Doniecki, Tomasz; Siedlecka, Ewa
Waste disposal is connected with hydro-ground environment contamination because of a toxic, chemical compounds migration. Agreement with existing regulations it is demanded of the storage yard protection by mineral insulation and synthetic insulation of the ground. Mineral fine-grained wastes are quite often offered to the mineral insulation building (for example: fly ash from commercial power engineering and clay rocks). It is possible using coaly sludge from coal enrichment process. The paper presents the possibilities of application of coaly sludge from KWK »Janina« (Libiąż) as an insulation material to the protection of hydro-ground environment in the storage yard region. Elementary parameters were defined: mineral composition, chemical composition and grain-size distribution. Additionally, physical properties were defined: density and volumetric density, optimum water content and maximum dry density. Variation of the hydraulic permeability with optimum porosity was correlated. It is possibility to use coaly sludge as the clay rocks substitute to the storage yard insulation.
Bacterial desulphurization of coal
(2006) Fečko, Peter; Pečtová, Iva; Čablík, Vladimír; Riedlová, Silvie; Ovčaří, Pavla; Tora, Barbara
The aim of this paper is to evaluate the suitability of a coal samples from different mines from Poland and Czech Republic for bacterial leaching. Laboratory research used a pure bacterial culture of Thiobacillus ferrooxidans. Were tested the samples from this localities: Mine Marcel, Mine Jankowice, Mine Staszic (Poland) and Mine Darkov and Mine Dukla (Czech Republic). The results showed that bacterial leaching was effective, with one month leaching time, when total desulphurization is from 38% to 72% and desulphurization of pyritic sulphur is from 60% to 82%. The paper describes changes of coal macerates after bacterial leaching.
Estymacja parametrów funkcji regresji metodą klasyczną oraz metodami bootstrapowymi
(2006) Foszcz, Dariusz
The paper presents description of methodology and analysis of non-classical bootstrap statistical methods application possibilities in regression function parameters estimation of mineral engineering processes. The review of applied methods of regression model parameters estimation was done. In purpose of initial checking of analysed methods, the evaluation of copper contents in feed influence on yield was made for technological results from O/ZWR Polkowice Region and Lubin. The estimation of regression function parameters estimation was done by classical method (Least Square Method) and by bootstrap methods. The comparative analysis of obtained estimation results of functional dependencies between analysed parameters for these methods.