Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Mill" wg kryterium: Wszystkie pola


Tytuł:
A mechanical layered model of a vibratory mill
Model mechaniczny warstwowy młyna wibracyjnego
Autorzy:
Sidor, J.
Powiązania:
https://bibliotekanauki.pl/articles/369061.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
młyn wibracyjny
model młyna
model warstwowy młyna wibracyjnego
vibratory mill
model of mill
layered model of a vibratory mill
Opis:
Vibratory mills are applied in processes of mechanical production of powders, micropowders, nanopowders and nanostructures. The paper comprises a description of tube mills operation: vibratory and rotary-vibration ones. It also presents their application and construction description including two industrial mills elaborated at the AGH University of Science and Technology in Krakow. There is also a brief analysis of existing models of mechanical vibratory mills. The main part of the paper deals with a model of mechanical vibratory mill known as a layered model. The most important element is a quantitative view of the load movement (grinding media with material) in the chamber. The model also takes into account the whole mechanical system of the mill i.e. inertial vibrator, vibro-isolation system and drive. The model was elaborated for the purposes of the mill computer simulation. During the simulation there were accepted the same technological (grinding media, ground material, grinding process) and kinematic parameters of the mill as the ones that occur in a real object i.e. the laboratory rotary-vibration LAMOW-B-5/2 mill. The paper includes results of a computer simulation of the model. The final part of the work verifies the computer simulation on the same mill and at the same kinematic and technological parameters of the mill and grinding process. Positive results of the verification indicate some possibilities of its application in designing of industrial and laboratory vibratory and rotary-vibration mills.
Młyny wibracyjne stosuje się w procesach mechanicznego wytwarzania proszków, mikroproszków oraz nanoproszków i nanostruktur. W pracy zamieszczono opis działania rurowych młynów: wibracyjnych oraz obrotowo-wibracyjnych. Podano także ich zastosowanie oraz opis budowy, w tym dwóch młynów przemysłowych opracowanych w Akademii Górniczo-Hutniczej. Podano krótką analizę znanych modeli mechanicznych młynów wibracyjnych. Zasadniczą część pracy stanowi model mechaniczny młyna wibracyjnego, zwany modelem warstwowym, którego najważniejszą częścią jest ilościowe ujęcie ruchu ładunku (mielników z materiałem) w komorze. Model ten uwzględnia także cały ustrój mechaniczny młyna, to jest wibrator bezwładnościowy, układ wibroizolacji oraz napęd. Model opracowano dla potrzeb symulacji komputerowej młyna. W symulacji przyjęto identyczne parametry technologiczne (mielników, mielonego materiału, procesu mielenia) i kinematyczne młyna które występują w rzeczywistym obiekcie, czyli laboratoryjnym młynie obrotowo-wibracyjnym LAMOW-B-5/2. Praca zawiera wyniki symulacji komputerowej tego modelu. Finalną część pracy jest weryfikacja symulacji komputerowej na tym samym młynie i przy tych samych parametrach kinematycznych i technologicznych młyna oraz procesu mielenia. Pozytywne wyniki weryfikacji modelu warstwowego wskazują na możliwość jego zastosowania w projektowaniu przemysłowych i laboratoryjnych młynów wibracyjnych i obrotowo-wibracyjnych.
Źródło:
Mechanics and Control; 2010, 29, 3; 138-148
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eti Copper Siirt flotation plant revision studies
Autorzy:
Kara, Yaşar
Tatar, Ali
Hasyamanlar, Ahmet
Powiązania:
https://bibliotekanauki.pl/articles/24085594.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
hydrocyclone
scavenger
SAG Mill
recovery
ball mill
Opis:
Several optimization studies were made to increase metal recovery and reduce operational costs of the concentrator in Siirt Madenköy copper mine. In consequence of these studies, effects of the changes in operating parameters, cost and plant recovery will be examined at this article. In this article, we will discuss two important revision studies, which are (i) replacement of 500 mm hydrocyclone set used in ball mills with 350 mm of hydrocyclone set, (ii) replacing the present Ball Mill with a SAG mill. Correspondingly elimination of the crushing and screening plant, (iii) increasing the scavenger cells from 4 to 6 by the addition of 2 more cells. In consequence with this feeding the middling tail to the increased scavenger cells which was treated as a part of final tail before this change. We will examine the effect of all these changes to the final recovery, concentrate grade and final cost.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 166260
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ile pluralizmu w liberalizmie? John Stuart Mill i Isaiah Berlin
Autorzy:
Aksiuto, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/647838.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Isaiah Berlin, culture, liberalism, John Stuart Mill, pluralism, relativism, universalism, value pluralism
Isaiah Berlin, liberalizm, John Stuart Mill, kultura, pluralizm, pluralizm wartości, relatywizm, uniwersalizm
Opis:
The article deals with the implications of pluralism, in various meanings of the term, for the liberalisms of two authors: John Stuart Mill and Isaiah Berlin. The question of pluralism, including value pluralism of which Mill is not a supporter, but which is embraced by Berlin, is discussed in connection with other crucial notions for both thinkers: an ideal of individuality for Mill and negative liberty in Berlin’s case. As a result, their respective liberalisms differ significantly, especially with regard to the desirable level of cultural diversity at the international level and within liberal societies.
Przedmiotem artykułu są implikacje pluralizmu w różnych znaczeniach tego terminu dla liberalizmu dwóch autorów: Johna Stuarta Milla i Isaiaha Berlina. Omawia on sposób, w jaki zagadnienie pluralizmu, w tym pluralizmu wartości, którego zwolennikiem nie jest Mill, a który przyjmuje Berlin, wiąże się z innymi kluczowymi wątkami refleksji obu tych myślicieli: ideałem indywidualności u Milla oraz koncepcją wolności negatywnej Berlina. W rezultacie ich liberalizmy różnią się od siebie, w szczególności w zakresie pożądanej różnorodności kulturowej na poziomie międzynarodowym oraz w obrębie liberalnych społeczeństw.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio K – Politologia; 2016, 23, 2
1428-9512
2300-7567
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio K – Politologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of process parameters of talc mechanical activation in centrifugal and attrition mill
Autorzy:
Andric, L.
Terzic, A.
Acimovic-Pavlovic, Z.
Pavlovic, L.
Petrov, M.
Powiązania:
https://bibliotekanauki.pl/articles/110391.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
talc
mechanical activation
ultra fine grinding
ultra-centrifugal mill
attrition mill
Opis:
The efficiency of talc mechanical activation by means of two different mechano-activators - centrifugal and attrition mill is investigated in this study and the comparative analysis of the characteristics of obtained talc powders is presented. A new approach for obtaining high-grade talc concentrate with low Fe2O3 content is achieved through effect of mechanical activation of talc accompanied by hydrometallurgical process. The applied mechanical activation process conditions of ultra-centrifugal mill were defined by number of rotor revolutions, sieve mesh size, and current intensity. These operating parameters of the ultra-centrifugal mill were variable. Ultra fine grinding of talc in attrition mill (attritor) was carried out in various time intervals - from 5 to 15 min. The following technological parameters of the mechanical activation were monitored: time of mechanical activation, circumferential rotor speed, capacity of ultra-centrifugal mill, and specific energy consumption. The investigation was based on a kinetic model. The structure and behavior of activated samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, and differential thermal analysis (DTA).
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 433-452
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Milling quality of small-leaved lime (Tilia cordata Mill.) wood
Jakość frezowania profilowego drewna lipy drobnolistnej (Tilia cordata Mill.)
Autorzy:
Pinkowski, G.
Szymanski, W
Powiązania:
https://bibliotekanauki.pl/articles/7407.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2014, 85
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Movement properties of antiresonance vibration mill with symmetrical construction
Autorzy:
Cieplok, Grzegorz
Piekaj, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2146609.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vibration mill
vibration grinding
antiresonance
młyn wibracyjny
szlifowanie oscylacyjne
antyrezonans
Opis:
Vibration mills used in the industry are an alternative to conventional gravity mills. Compared to gravity mills they have much lower demand for energy of the milling process, significantly lower mass and several times lower cost of raw materials milling. In addition, they have much greater technological possibilities, which justifies their use in many cases. Apart from a number of advantages, vibration mills have disadvantages. The dynamics of work causes a significant transfer of vibrations to the ground and a major load on the vibrator bearings. As a result, they require temperature monitoring and the use of complex cooling systems. It is possible to reduce these negative effects by using new construction solutions.
Źródło:
Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020302
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic grinding test approach to estimate the ball mill work index
Autorzy:
Gharehgheshlagh, H. H.
Powiązania:
https://bibliotekanauki.pl/articles/109794.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
work index
Bond method
kinetic grinding test
grindability
ball mill
Opis:
The standard Bond method is the most acceptable method for designing and selecting ball/rod mills described by their basic parameter called work index (Wi). The standard Bond method is a tedious time consuming procedure requiring at least 7 – 10 grinding cycles, so that many researchers have tried to simplify this method to be able to perform a rapid calculation of a work index. This study aims to develop a new approach toward estimating the Bond ball mill work index (BBWI) by applying a series of kinetic grinding tests with Bond standard mill. Establishing a series of relationships between grinding parameters and Bond equation parameters, this approach is fast and practical due to eliminating laboratory control steps while reducing the number of milling steps. In this scope, thirteen ore samples were used to compare Wi values obtained by standard Bond method with those of the proposed kinetic approach. The kinetic periods were determined as 0.33, 1, 2, 4 and 8 minutes. The results of kinetic tests were found to be logical and acceptable as they were so close to the values obtained by Bond standard method, for all samples error was ≤ 2.60%. It was therefore concluded that the proposed approach could be considered as a simple yet practical alternative for the standard Bond method.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 342-352
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of chattering phenomenon in industrial S6-high rolling mill
Autorzy:
Valigi, M. C.
Papini, S.
Powiązania:
https://bibliotekanauki.pl/articles/329438.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
chatter
vibration analysis
S6-high rolling mill
Opis:
Chatter in rolling mills is the undesirable vibration observed in most of the rolling mills operating at high speed and rolling thin strip. In this work the authors discuss some problems relative to the vibrations occurring in a S6-high cold rolling mill. It can result in not good surface finish for some applications and, rare cases, in gauge variations in the rolled strip and it is considered to be the result of interaction between rolling mill structure and rolling-process. Three basic types of chatter can be classified in rolling mills: torsional, third-octave mode, and fifth-octave-mode chatter. S6-high rolling mill is an innovative mode to work the steel: it allows the use of very small work rolls laterally guided by individually adjustable side support rolls, which are supported by two rows of roller bearings mounted in cassettes. It has six rolls able to roll steel strip coming directly from hot rolling mill train. A proposed solution based on empirical observations, vibration analysis and considerations of a model is described with the aim to improve the quality of the product and increasing production.
Źródło:
Diagnostyka; 2013, 14, 3; 3-8
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of ball size distribution on power draw, charge motion and breakage mechanism of tumbling ball mill by discrete element method (DEM) simulation
Autorzy:
Panjipour, R.
Barani, K.
Powiązania:
https://bibliotekanauki.pl/articles/110020.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
discrete element method
ball mill
ball size distribution
mill power
breakage mechanism
Opis:
In this research, the effect of ball size distribution on the mill power draw, charge motion regime and breakage mechanism in a laboratory ball mill was studied using the discrete element method (DEM) simulation. The mill shell and crushing balls were made of Plexiglas® and compressed glass, respectively. Modeling was performed using Particle Flow Code 3D (PFC3D). Model parameters were back-calculated by comparing the power draws and images obtained from simulation and laboratory test works. After determining the model parameters, the mill was simulated in mill fillings of 15, 20, 25, 30, 35 and 40% with ball media of 2 and 2.5 cm in diameter. For every mill filling, the numbers of big and small balls were changed and 11 scenarios were chosen. The results showed that at a constant mill filling, the power draw was changed with changing the ball size distribution and for all mill fillings the maximum power draw occurred when the fraction of small balls was between 30-40%. The effect of ball size distribution increased with increasing mill filling and for the mill filling of 35%, the ball size distribution had the maximum effect on the power draw. When the mill charge contained mono-sized balls, the ball flow regime inside the mill transited to the cataracting and impact breakage was the main breakage mechanism. Increasing the fraction of big balls from 0 to 70% led the flow of balls into the cascading regime and breakage mechanism to attrition.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 258-269
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and simulation of vertical roller mill using population balance model
Autorzy:
Fatahi, Rasoul
Barani, Kianoush
Powiązania:
https://bibliotekanauki.pl/articles/1449686.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vertical roller mill
modeling
simulation
cement grinding
residence time distribution
Opis:
There are few studies concerning the process simulation of vertical roller mills (VRMs). In this research work, the application of population balance model for simulation of a VRM in a cement clinker grinding circuit was investigated. The residence time distribution (RTD) was measured, and the tank-in-series and Weller models were employed to describe the residence time distribution. Two sampling surveys were carried out on the VRM circuit. The data from the first survey were used for model calibration, and the specific breakage rates were back-calculated. The model parameters obtained were used for simulation of the second survey, and validation of the model. The results showed that the clinker particle spent a short time inside the VRM and the mean residence time is about 67s. The tanks-in series model compares to Weller model was more proper to describe the residence time distributions in the VRM. The simulation results showed that the specific breakage rates increased with increasing particle size. However, the particles larger than 25.4 mm particles sizes are too large to be properly nipped by master rollers. Finally, it can be concluded that the grinding process of the VRM is very well-predictable with the population balance model.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 1; 24-33
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First-order and second-order breakage rate of coarse particles in ball mill grinding
Autorzy:
Barani, K.
Balochi, H.
Powiązania:
https://bibliotekanauki.pl/articles/109734.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ball mill
grinding kinetic
particle breakage
Opis:
It has been observed by many authors that the breakage rates of coarse particles in a ball mill slow down with increasing grinding time and deviate from the first order. In this paper it is intended to find out whether the breakage rates of coarse particles obey second-order kinetics or not. For this purpose, quartz, limestone, iron ore and a mixture of quartz/limestone (weight ratio of 1:1) were selected as a ball mill feed. The first-order breakage rate was determined for the four particle sizes of quartz, limestone, iron ore and the mixture of quartz/limestone. Results indicating good first-order kinetics were obtained with the fine-sized particles (-1.2+1 mm, -0.6+0.42 mm). However, the coarse-sized particles (-5+4 mm, -3.15+2.5 mm) showed deviations from the first order. These coarse particles were in the abnormal breakage region. The second-order breakage rate was determined for the coarse particles (-5+4 mm, -3.15+2.5 mm). It can be seen that, for both sizes and all the materials, the second-order plot had better fit than the first-order plot. Also, it can be concluded that the second-order kinetics could model the breakage of coarse particles better than the first-order kinetics, and the validity of the second-order breakage rate was increased with increasing particle size. However, it is suggested to examine the validity of the second-order breakage rate kinetics for other materials and particle sizes.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 268-278
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The unlikely advocates of media literacy education: Jean-Jacques Rousseau and John Stuart Mill
Autorzy:
Neag, Anamaria
Powiązania:
https://bibliotekanauki.pl/articles/470981.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Komunikacji Społecznej
Tematy:
media literacy
media education
Jean-Jacques Rousseau
John Stuart Mill
Opis:
Media literacy is defined as a set of competencies that helps people critically analyze, understand and create media messages. Teaching children to become media literate emerged as a new field of education in the second half of the 20th century. While the pioneering work of Dewey, Freinet, Gerbner, Hall and Whannel (as cited by Cappello et al., 2011) was influential in the development of media literacy, this article argues for the importance of positioning media literacy in a broader theoretical context. Therefore, the article presents an analysis of media literacy education by relying on two of the founders of modern social thought: Rousseau and Mill. The article demonstrates how Rousseau’s treatise is as timely as ever when it comes to understanding the educational aims of media literacy. Similarly, Mill’s approach helps us in understanding the importance of media literacy education not only in school curricula, but also in many other aspects of social life.
Źródło:
Central European Journal of Communication; 2016, 9, 1(16); 104-113
1899-5101
Pojawia się w:
Central European Journal of Communication
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influences of operating parameters on dry ball mill performance
Autorzy:
Cayirli, S.
Powiązania:
https://bibliotekanauki.pl/articles/110047.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
conventional ball mill
particle size
surface area
grinding aid
fluidity index
Fourier Transform Infrared Spectroscopy
Opis:
The paper is aimed to investigate the influence of operating parameters on dry fine grinding of calcite in a laboratory scale conventional ball mill. Within the context, the influence of operating parameters such as mill speed, ball filling ratio, ball size distribution, powder filling ratio, grinding aid dosage and grinding time were studied. The results of grinding tests were evaluated based on the product particle size (d50, d80) and surface area (m2/kg). As a result of this study, optimum grinding test conditions determined to be 70% of Nc, J=0.35 for ball filling ratio, 40 mm (10%), 32 mm (10%), 20 mm (40%), 12 mm (40%) for ball size distribution, fc=0.125 for powder filling ratio, 2000 g/Mg for grinding aid dosage and 60 min for grinding time. After determining optimum grinding conditions, the influence of grinding aid dosage on powder fluidity was determined. The use of 2000 g/Mg grinding aid dosage had a greater fluidizing effect compared to the other dosages and no aid condition (0 g/Mg). The influence of grinding aid on dry fine grinding of calcite was also examined by Fourier Transform Infrared Spectroscopy (FTIR). FTIR measurements indicated that grinding aid was adsorbed on the ground calcite particles surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 751-762
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of complex dynamic nonlinear loading process for electromagnetic mill
Autorzy:
Ogonowski, Szymon
Bismor, Dariusz
Ogonowski, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/229680.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
predictive control
pole placement
nonlinear dynamics
neural modelling
electromagnetic mill
Opis:
Electromagnetic mill installation for dry grinding represents a complex dynamical system that requires specially designed control system. The paper presents model-based predictive control which locates closed loop poles in arbitrary places. The controller performs as gains cheduling prototype where nonlinear model – artificial recurrent neural network, is parameterized with additional measurements and serves as a basis for local linear approximation. Application of such a concept to control electromagnetic mill load allows for stable performance of the installation and assures fulfilment of the product quality as well as the optimization of the energy consumption.
Źródło:
Archives of Control Sciences; 2020, 30, 3; 471-500
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies