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Wyświetlanie 1-15 z 259
Tytuł:
Klassifikacija i ocenka izmelchitelejj zerna
Classification and evaluation of grain mills
Autorzy:
Potapova, S.
Powiązania:
https://bibliotekanauki.pl/articles/77084.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
feedstuff
grain mill
roller mill
hammer mill
evaluation
classification
Opis:
В статье рассмотрены основные типы измельчителей фуражного зерна, обоснован выбор рациональной конструкции измельчителя.
The main kinds of feed mills were described in this article. Their advantages and disadvantages were evaluated and compared. Some ways to improvement these mills are proposed. The choice of the rational grain mill's design was grounded.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
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:
Wpływ młynów wodnych na przekształcenia sieci hydrograficznej Wadowic i okolic
The impact of water mills on the transformations of hydrographic network of Wadowice
Autorzy:
Witkowski, Karol
Witkowski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/458094.pdf
Data publikacji:
2017
Wydawca:
Wadowickie Centrum Kultury im. Marcina Wadowity
Tematy:
water mills
hydrographic network
mill race
mill ponds
Opis:
The main goal of the research was to determine the impact of construction, functioning and liquidation of water mills on the hydrographic network of Wadowice and its surroundings. Another indirect purpose was to reconstruct the medieval river network from the period prior to the heyday of milling and indicate the remaining traces of the milling infrastructure. The research was conducted on the basis of analysis of historical sources and archival topographic maps. The origins of development of milling in Wadowice were dependent on the royal privileges. The first of them was issued in the 15th century. The mills in Wadowice were located on rivers Choczenka, Kleczanka and Dąbrówka, as well as on three artificial mill races, but never on river Skawa. The longest mill race began in Świnna Poręba, where it was supplied with water from Skawa. At the foot of Iłowiec, the mill race was supplied from Nawieśnica and Potok Zbywaczowski, whose course was modified. After merging with Dąbrówka, the mill race ran further parallel to Skawa and ultimately flowed to Choczenka. There were between 3 and 5 mills throughout the entire course of the artificial crosscut. Between 1 and 3 mills were situated at the watercourse which supplies the ponds in Wadowice and Tomice. The third mill race, which began in Kleczanka, powered 1 mill and flowed into Skawa after merging with Rokowski Potok. Due to the environmental conditions, the mills in Wadowice did not require construction of ponds. The mills in Wadowice were located on the basis of economic conditions. The natural conditions were not favourable for the functioning of hydraulic machines, which forced the construction and maintenance of artificial riverbeds. Water milling was subsequently liquidated due to the development of steam mills, and ultimately electric mills. In consequence of the decline of water mills, the maintenance works on mill races were abandoned. Some of the watercourses were backfilled, others were transformed into drainage ditches, whereas the mills in the town were included in the sewerage system. The shape of the former river network of Wadowice is now only reflected by few fragments of certain creeks.
Źródło:
Wadoviana. Przegląd historyczno-kulturalny; 2017, 20; 100-113
1505-0181
Pojawia się w:
Wadoviana. Przegląd historyczno-kulturalny
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:
Selective comminution and grinding mechanisms of spent carbon anode from aluminum electrolysis using ball and rod mills
Autorzy:
Ni, Chao
Zhou, Shaoqi
Gao, Jixuan
Bu, Xiangning
Chen, Yuran
Alheshibri, Muidh
Xie, Guangyuan
Li, Biao
Powiązania:
https://bibliotekanauki.pl/articles/2146907.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
selective comminution
ball mill
rod mill
spent carbon anode
grinding mechanizm
Opis:
The recovery of spent carbon anode (SCA) materials plays important roles in environment protection and resources recycling, while this cannot be efficiently achieved without liberation. In this study, grinding characteristics of spent carbon anode from aluminum electrolysis in both ball mill and rod mill were analyzed, and compared based on the utilization of the selective Fuerstenau upgrading curves. In addition, the different grinding mechanisms of ball and rod milling were evaluated by analyzing the shape factor and surface roughness of the ground samples. Results of mineralogical characterizations indicated that carbon particles (d50 = 46.86 μm) presented in the SCA were closely associated with cryolite particles. At 5 min grinding time, the maximum selective comminution factor (β) values of ball milling and rod milling were 2.00 and 1.63, respectively, indicating a higher degree of selective comminution of SCA was achieved from ball milling. Comparisons of the valuable component content (cv, cum) of -125 μm ground particles and the shape characterizations of 74–125 μm ground particles generated from ball and rod milling manifest that a direct relationship exists between the degree of selective comminution and the grinding mechanism.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 145667
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
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:
Path Interval and Its Relevance to Cutting Force in Ball and Filleted End Milling
Autorzy:
Sekine, Tsutomu
Powiązania:
https://bibliotekanauki.pl/articles/2022253.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
path interval
material removal rate
cutting force
ball end mill
filleted end mill
Opis:
Computerized milling process is widely used in product manufacturing. Although manufacturing has gradually become highly-automated, the selection of machining conditions still remains an ever-present challenge in the process. To provide some findings contributable for the process planning, this study focuses on ball and filleted end milling. After brief explanations were given to the path interval determinations in both milling processes, the experiments were conducted to verify and characterize each procedure. The results of computational procedures showed good agreement with the experimental ones. Then, material removal rate and cutting force were analytically proposed for effective selection of machining conditions. The following findings were obtained from the demonstrations with discussion. Ball end milling required relatively large cutting force in the first tool path even though the material removal rate was comparatively small. On the contrary, filleted end mill enabled us to maintain a moderate cutting force in the first tool path even if the material removal rate expanded with increasing tool radius.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 1; 85-94
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane zagadnienia mielenia materiałów w pionowych młynach rolkowo-misowych
Selected issues of materials milling in vertical roller-mills
Autorzy:
Mateuszuk, S.
Powiązania:
https://bibliotekanauki.pl/articles/392322.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
mielenie
młyn pionowy
młyn rolkowo-misowy
młyn średniobieżny
rozwiązanie konstrukcyjne
modelowanie
miling
vertical mill
roller mill
medium speed mill
design solution
modelling
Opis:
Pionowe młyny misowo-rolkowe oraz młyny rurowo-kulowe są urządzeniami technicznymi przeznaczonymi do mielenia, suszenia i separacji kruchych materiałów mineralnych o średniej i dużej twardości Ponieważ konstrukcja młynów misowo-rolkowych charakteryzuje się wysoką niezawodnością i dużą dyspozycyjnością, młyny znalazły powszechne zastosowanie w energetyce światowej. W związku z tym w przemyśle cementowo-wapienniczym coraz więcej instaluje się młynów misowo-rolkowych. Eksploatacja już zainstalowanych potwierdziła bardzo dobre wyniki w procesach mielenia kamienia wapiennego oraz wapna palonego – uzyskuje się produkt miałki, drobny i suchy, co potwierdziły badania. W energetyce zastosowanie drobnego pyłu węglowego ma kluczowe znaczenie w obniżeniu emisji tlenków azotu i węgla. W artykule przedstawiono przegląd rozwiązań konstrukcyjnych młynów średniobieżnych, zaprezentowano model układu mielenia w skali półtechnicznej oraz badania wpływu strumienia dozowanego mieliwa, prędkości obrotowej misy i wysokości pierścienia spiętrzającego na wysokość warstwy tworzącej się w układzie mielącym podczas procesu mielenia.
Vertical roller mills and tube-ball mills are technical equipment intended for grinding, drying and separation of fragile mineral materials, medium and high hardness. Due to the fact, that the roller mills in its design are highly reliable devices with high availability, they have found widespread applications in the world energy sector. However, more and more of these mills are installed in the cement and lime industry. Operation of already installed roller mills confirmed the very good results obtained in the process of grinding of limestone and quicklime. Studies have confirmed that the obtained product is respectively fine and dry with a grain size ranging from 1mm. The energy gain of fine coal dust is crucial for reducing emissions of nitrogen oxides and carbon oxides. The article presents an overview of design and operational solutions refers to the construction of medium speed roller mills. The paper presents a pilot model of the grinding unit and studies on influence of feed stream, bowl speed and height of the weir ring on height of layers forming in the system during the grinding process.
Źródło:
Prace Instytutu Ceramiki i Materiałów Budowlanych; 2012, R. 5, nr 9, 9; 113-124
1899-3230
Pojawia się w:
Prace Instytutu Ceramiki i Materiałów Budowlanych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Possibilities of Obtaining the Fine Particle Size in Mills of Various Designs
Analiza możliwości uzyskania drobnego uziarnienia w młynach o różnych konstrukcjach
Autorzy:
Wołosiewicz-Głąb, M.
Foszcz, D.
Gawenda, T.
Powiązania:
https://bibliotekanauki.pl/articles/319028.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
młyny
rozdrabnianie surowców
mielniki
młyn elektromagnetyczny
młyn kulowy
młyn wibracyjny
IsaMill
mills
grinding process
grinding media
electromagnetic mill
ball mill
vibratory mill
Opis:
The paper presents the problem of obtaining the fine grained material in mills of different constructions. Various types of mills have been characterized, taking into account the type of grinding media used. Characteristics of selected mills and grinding media used were presented and the movement of the particles in the drum of the ball mill has been shown. Mills with mixed grinding media have been described. Model of "transport energy pulses" for free grinding media in the Kurrer’s tubular chamber of the vibratory mill were described. Paper discusses the advantages and opportunities for fine grinding in the electromagnetic mill, performance and in particular the energy cost of commimtion, that is achievable in this device.
W artykule przedstawiono problematykę uzyskiwania drobno uziarnionych materiałów w młynach o różnych konstrukcjach. Dokonano charakterystyki różnych rodzajów młynów z uwzględnieniem typu stosowanych mielników. Pokazano charakterystykę wybranych młynów i użytych w nich mielników. Opisano ruch ziarna w bębnie młyna kulowego, a także model „transportu impulsów energii” ku mielnikom w rurowej komorze młyna wibracyjnego według Kurrera. Omówiono zalety i możliwości w zakresie drobnego mielenia w młynie elektromagnetycznym w szczególności wydajność oraz wydatek energii na rozdrabnianie, jakie możliwe jest do uzyskania w tym urządzeniu.
Źródło:
Inżynieria Mineralna; 2016, R. 17, nr 1, 1; 223-231
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ispolzovanie metoda konechnykh elementov dlja konstruktorskikh raschetov molotkovykh drobilok
Use the method finit element for design calculation of hammer crushers
Autorzy:
Devin, V.
Tkachuk, V.
Powiązania:
https://bibliotekanauki.pl/articles/77570.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
hammer mill
feed mill
crusher
rotating part
finite element method
computer simulation
mathematical apparatus
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 5
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksperymentalne badania kształtu bryły mieliwa i jego ruchu na misie młyna rolkowo-misowego
Research on material bulk shape and its movement on the ring-roller mill table
Autorzy:
Junga, R.
Mateuszuk, S.
Pospolita, J.
Powiązania:
https://bibliotekanauki.pl/articles/172823.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
młyn misowo-rolkowy
młyn węglowy
węgiel kamienny
pan-roller mill
coal mill
hard coal
Opis:
Przedstawiono badania ruchu mieliwa w układzie mielącym młyna rolkowo-misowego w skali 1:4. W badaniach mierzono wysokość warstwy węgla na misie w zakresach zmian parametrów układu mielącego m.in. prędkości obrotowej misy, wysokości pierścienia spiętrzającego oraz strumienia węgla W oparciu o wyznaczone kształty brył mieliwa na misie obliczono średnie prędkości promieniowe mieliwa. Badania uzupełniono o analizę ruchu znaczników dodawanych do strumienia węgla dozowanego na misę, co pozwoliło na wyznaczenie średnich wartości składowych prędkości przemieszczania się wierzchnich warstw mieliwa.
This paper is a presentation of tests performed to analyze grinding material movements in a ring-roller milling system in 1:4 scale. Subject to research was the hard coals layer thickness on the mills table depending on the range of the mill parameters changes, i.e. tables rotary velocity, height of the pile-up ring and coal feed stream. Basing on the determined material bulk shapes on the table, average radial velocities of the material could be calculated. The test were then supplemented with an analysis of markers movement added to the coal streams being fed onto the table, which enabled determining average values of velocity components for material surface layers relocation.
Źródło:
Archiwum Energetyki; 2011, 41, 1; 25-37
0066-684X
Pojawia się w:
Archiwum Energetyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TPM safety impact – case study
Autorzy:
Maszke, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/88553.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
TPM
safety
rolling mill
bezpieczeństwo
walcarka
Opis:
The global production companies of today are exposed to increasingly stronger pressure to implement new technologies, improve quality and decrease production costs. All this is related to ensuring a proper technical condition of machines and devices. This article presents the results of an analysis of the impact of implementation of TPM at the rolling mill on work safety. The number of near misses and accidents was used as a measure of the safety level.
Źródło:
System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 639-646
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
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:
Effective circulating load ratio in mill circuit for milling capacity and further flotation process : lab scale study
Autorzy:
Pural, Yusuf Enes
Çelik, Muhammed
Özer, Mustafa
Boylu, Feridun
Powiązania:
https://bibliotekanauki.pl/articles/2146931.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
circulating load
mill capacity
flotation performance
Opis:
The design of the grinding circuits and the control of the transferring load in the ore preparation plants are of great importance from a technical and economic point of view. The importance of the circulating load for grinding process is well known and stated in the literature. However, there are not many studies on the effect on the following processes. In this study, the effect of the circulating load on both the grinding capacity and the subsequent flotation process was investigated at laboratory scale. Copper ore was used in the experiments. The circulating load was adjusted by changing the residence time of the material in the mill. Then, flotation experiments were carried out with the materials obtained at different circuit loads. The results showed that the grinding capacity can be increased up to 180% by optimizing the circulating load and it will positively affect the flotation performance. It was observed that a concentrate with the highest recovery for the same Cu grade was obtained with CLR of 150 % when compared to flotation recoveries through various CLRs. It is suggested that the circulating load should not be evaluated only in terms of the grinding process, but also the subsequent processes should be considered. Future studies in this area may contribute to industrial applications.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 149916
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 259

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