Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2010
Volume
R. 34
Number
Nr 4/1
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 34 (2010)
Projects
Pages
Articles
Analiza możliwości prognozowania wyników wzbogacania polskich rud miedzi uwzględniającego stosowaną technologię
(Wydawnictwa AGH, 2010) Foszcz, Dariusz; Niedoba, Tomasz; Tumidajski, Tadeusz
The paper presents the proposal of methodology of Polish copper ores beneficiation results forecasting. The widely applied types of beneficiation curves were discussed, which were the basis for forecast. To this purpose, four various approximations of relations ${\lambda} = {\lambda}(β)$ were taken into consideration. It was stated that they give various effects by transferring to curve ${\epsilon} = {\epsilon}({\beta})$ what is caused by high sensitivity of ${\epsilon}$ on changes of ${\beta}$. The second applied method based on dependency of parameters describing certain beneficiation curve on contents of lithology types in feed. The Dell and Fuerstenau curves were applied to this purpose. The obtained results were then evaluated, indicating that the full forecast of the results is practically impossible to obtain because it depends on too many factors.
Możliwości poprawy dokładności aproksymacji krzywych składu materiałów uziarnionych
(Wydawnictwa AGH, 2010) Foszcz, Dariusz; Saramak, Daniel; Tumidajski, Tadeusz; Niedoba, Tomasz; Gawenda, Tomasz
The approximation adequacy of particle size distribution curves for various grained materials is very significant in many industrial processing investigations. The authors propose in the paper various approaches to this issue, indicating advantages and disadvantages of classical and non-classical statistical analyzes. On the basis of selected results of particle size distributions of certain grained material, the classical forms of approximated formulas were presented, i.e. GSA, Weibull and log-norm distribution functions. It was indicated that the acceptance of proper maximum particle size is difficult to determine and leads to application of the so-called censored distribution functions. Furthermore, the non-parametrical methods of approximation were applied, such as orthogonal Fourier series and kernel methods. Their application results usually in better adequacy of approximation, but they cannot be the basis for technological interpretation. Furthermore, the approximation by the least squared method was performed with application of weights. The best approximation results were obtained for the logistic distribution function.
Sorpcja jonów metali toksycznych z roztworów wodnych na odpadach naturalnych - przegląd literaturowy
(Wydawnictwa AGH, 2010) Gala, Agnieszka; Sanak-Rydlewska, Stanisława
This article presents a review of selected literature data on sorption of metal ions on different natural materials (e.g. fruit stones, nut shells, tobacco dust, algaes, seaweeds). The review allows conclude that removal of toxic metals by means of natural sorbents is very promising method. Organic materials used in this process were found to be competitive with refer to commonly used sorbents (e.g. activated carbons). Additionally, important advantage of organic sorbents is possibility of their regeneration.
Rozdrabnianie ziaren piasku kwarcowego na laboratoryjnym stanowisku młyna strumieniowo-tarczowego
(Wydawnictwa AGH, 2010) Górecka-Zbrońska, Aleksandra; Zbroński, Daniel
The experimental results of comminution process selected size fractions of quartz sand on the laboratory stand of target-jet mill are presented in the paper. Experiment stand makes possible to comminute grains accelerated by the air jet with a single impact, using stationary target. Determined particle size distribution of product makes possible to estimate of quality and efficiency of comminution process. On the basis of experimental results the probable explanation of comminution mechanism of grains in the target-jet mill is presented. The analysis showed that comminution in the mill takes place as a result of percussive cracking and superficial attrition of grains.
Influence of heavy metals on soil microflora
(Wydawnictwa AGH, 2010) Hołda, Anna; Kisielowska, Ewa; Niedoba, Tomasz
The purpose of the research presented in the paper was to conduct the heavy metals contents in area of tannery plant and to determine their influence on soil microflora. The soil samples were collected to this purpose from the area, which was surrounded by the industrial buildings from one side (tannery, galvanic plant and chemistry plant) and by river Wilga and two small ponds from three remaining ones, which supposedly collect the sewers from these plants. The collected samples were then chemically and microbiologically analyzes. The contents of metals as Cu, Cd, Pb and Zn were determined by culometric method. On the basis of conducted analyzes it was proved that soil on the researched area was polluted by heavy metals. Mainly chromium contents in every sample was high what means that the tannery wastes occurs in the area of collecting samples. The investigation proved the influence of heavy metals on soil microflora. Various sorts of microorganisms have various tolerance on high metals concentration. The most resistant were ferruginous, nitrificative and denitrificative bacteria, the less resistant were meso- and psychrophilic bacteria and fungi.