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Tytuł:
An attempt to increase technological capabilities of laboratory vibratory mills by changing the construction of chamber
Autorzy:
Tomach, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2064386.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
mills
vibratory mills
fine grinding
high energy mills
młyny
młyny wibracyjne
drobne mielenie
młyny wysokoenergetyczne
Opis:
The paper presents the issues related to the grinding process in the vibration mills with low vibration frequency. These mills are rated among devices with high energy of impacts with much wider potential of industrial use than the classic gravitation mills. In vibratory mills there is an unfavorable decrease in the intensity of the grinding process along with the increase in the chamber diameter, which makes it impossible to achieve high performance of such devices. One of the ways to reduce or eliminate this occurrence is to intensify the load movement inside the chamber - this is the subject of this article. The article shows that in a vibrating mill of periodic action it is possible to increase its technological capabilities by application of an appropriate cylindrical component permanently installed inside the milling chamber. The paper also presents an attempt to increase the technological capabilities of a laboratory continuous vibratory mill.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 195--205
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bond´s work index estimation using non-standard ball mills
Autorzy:
Arellano-Piña, Ramón
Sanchez-Ramirez, Elvia Angélica
Pérez-Garibay, Roberto
Gutiérrez-Pérez, V.H.
Powiązania:
https://bibliotekanauki.pl/articles/27323664.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Bond´s Work Index
rocks grinding
laboratory scale ball mills
ore characterization
non-standard ball mills
Opis:
Ore concentrators seek the stability of processes by feeding blends of rocks with average hardness and ore content. Therefore, large amounts of samples must be characterized in a short time. The Bond Work Index () is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours) and liable to experimental errors. This work contributes to obtaining new models for rapid Bond Work Index estimation using non-standard dimensions mills. This was done by proposing grinding tests using four types of ores and four mills of different dimensions, including the standard Bond ball mill (BBM). For all tests it was kept constant: (a) critical speed (91%), and (b) mill charge by volume (10.5%), varying the amount of fresh feed according to its density. The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (=0.23; = 0.82, and = 44.5), are unable to predict the Work Index properly. Therefore, these constants must be recalculated using linear models based on mill diameter. With the models proposed for , , and , the Bond Work Index (kWh/t) can be rapidly estimated (less than 2 hours) and show a high accuracy for mills of non-standard dimensions (R2= 0.96).
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172458
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the power draw of tumbling mills : a comprehensive review
Autorzy:
Golpayegani, Mohammad Hasan
Rezai, Bahram
Powiązania:
https://bibliotekanauki.pl/articles/2146928.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
grinding
tumbling mills
power draw
modeling approaches
Opis:
Optimizing power consumption in grinding, the most consumed stage in the mining industry, plays an influential role in reducing operating costs. Obtaining an efficient model to predict tumbling mills' power consumption accurately took the attention of researchers, mineral processing engineers, and tumbling mill manufacturers. This article comprehensively reviews the published mill power models and the most critical studies on this topic since 1919. Furthermore, the employed approaches for modelling the tumbling mills' power draw, the incorporated parameters into the developed models, the models' performances in predicting the industrial mills' power draw, and the potential gaps in the available literature are discussed. Moreover, based on the shortages identified in this review, some recommendations have been made to enhance the modelling mill power draw.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 151600
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of efficiency of grinding in ball and rod mills dependably on contents of fine particles in feed
Analiza efektywności procesu mielenia w młynach kulowych i prętowych w zależności od zawartości ziarn drobnych w nadawie
Autorzy:
Foszcz, D.
Gawenda, T.
Powiązania:
https://bibliotekanauki.pl/articles/348793.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
rozdrabnianie
młyny kulowe
młyny prętowe
ziarna drobne
zużycie energii
comminution
ball mills
rod mills
fine particles
energy consumption
Opis:
The paper presents the analysis of efficiency of the work of ball and rod mills dependably on granulation of the feed, particularly on fine particles contents. The analysis was conducted on the basis of the laboratory and industrial results realized as the part of research works for O/ZWR KGHM PM SA. The efficiency of grinding process was evaluated by the factor describing increase of certain chosen particle size fractions in mill yield. The issue of determining fine particle fractions before operations of comminution is crucial from the point of view of economics of conducting processing process. The liberation of fine particle fractions, so-called "ready" for further operations not requiring comminution on certain level influences on comminution costs and expected capacity of comminuting devices. It is very important to determine the efficiency of comminuting operations dependably on fine particles contents for correct determination of comminution system scheme. It allows determination of expected efficiency of classification process and optimization of investments costs connected with purchase of devices of certain capacity as well operative ones connected with energy consumed by designed technological system.
W artykule przedstawiono analizę efektywności pracy młyna kulowego i prętowego w zależności od uziarnienia nadawy a w szczególności udziału klas drobnych. Analizę przeprowadzono na podstawie wyników badań laboratoryjnych oraz przemysłowych wykonanych w ramach prac badawczych dla O/ZWR KGHM PM SA. Efektywność procesu mielenia oceniano wskaźnikiem przyrostu określonych wybranych klas ziarnowych w wylewie młyna. Zagadnienie wydzielania drobnych klas ziarnowych przed operacjami rozdrabniania jest niezwykle istotne z punktu widzenia ekonomiki prowadzenia procesu przeróbki. Wydzielenie drobnych klas ziarnowych tzw. "gotowych" do dalszych operacji nie wymagających rozdrabniania na danym stadium wpływa na koszty rozdrabniania oraz oczekiwaną wydajność urządzeń rozdrabniających. Niezwykle istotne dla prawidłowego określenia schematu układów rozdrabniania jest wiec ustalenie efektywności operacji rozdrabniania w zależności od zawartości ziarn drobnych. Pozwala to określić oczekiwaną efektywność procesu klasyfikacji i umożliwia optymalizację kosztów inwestycyjnych związanych z zakupem urządzeń o określonej wydajności i operacyjnych związanych z energią elektryczną zużywaną przez zaprojektowany układ technologiczny.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 4; 17-30
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
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:
Clay/nanocomposite hydrogels : In review
Autorzy:
Kurama, Haldun
Şengel, Sultan Bütün
Powiązania:
https://bibliotekanauki.pl/articles/24085586.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrogel
clay
composite hydrogel
exfoliation
high energy ball mills
Opis:
The development of advanced materials those are stronger, more rigid, lighter, hotter and self-renewable than existing materials has been the rising point of many research studies conducted in recent years. Within this scope, the interest to production of nanostructured materials is received considerable attention worldwide due to their potential positive contribution to wide variety of technological areas such as electronics, catalysis, adsorbents, ceramics, magnetic data storage, structural components etc. In these efforts polymer nanocomposites as the form of hydrogels, reinforced with well-dispersed layered silicate, typically montmorillonite can be given as a one of the promising composite material. However, long-standing problems for polymer-clay nanocomposites include actual exfoliation of clay particles in discrete layers, uniform distribution of clay layers throughout the polymer, and randomness of clay sequences. For the exfoliation of clay particles, although the chemical modification of clay minerals in aqueous media is the well-known and more general way applied by researchers, the physical pathway method performed by high-energy ball mills is also gaining increasing attention as an alternative pretreatment way. Grinding of crushed materials is one of the key processes in the mineral and cement industry, but the increased concern on the preparation of fine-grained powders (nano powders) or the manufacture of composites with desirable properties, especially performed with use of high-energy ball mills, has led to significantly widen the usage field of grinding. Undoubtedly, the main reason for these efforts is to improve the performance of existing materials. In this paper the fundamental concepts, classification, physical and chemical characteristics and the production methods of clay/polymer nanocomposites was briefly reviewed base on the composite hydrogel. Particular attention was paid to the pre-treatment (exfoliation) of clays with high-energy ball mills, which is increasingly being accepted as an alternative method to eliminate the negative effects of chemical treatment in some composite forms.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 165991
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using FCAW with Electrodes Based on Fe-Ti-Mo-B-C System for Increasing of Durability of Junk Removal Tools
Autorzy:
Ivanov, Olexandr
Prysyazhnyuk, Pavlo
Romanyshyn, Liubomyr
Romanyshyn, Taras
Mosora, Yurii
Powiązania:
https://bibliotekanauki.pl/articles/2065035.pdf
Data publikacji:
2021
Wydawca:
STE GROUP
Tematy:
abrasion resistance
flux cored electrodes
hardfacing
junk mills
microstructure
Opis:
In this work were analyzed factors and working conditions that leads to the wearing of junk mills tools that are a part of junk removal equipment used in drilling and workover of borehole. Such equipment is a part of oil and gas industry and work under condition of intense abrasive wearing with increased pressures and cyclic loads. Was established that traditional hardfacing materials based on the Fe-Cr-C system are not effective for improvement of abrasion resistance of elements of such equipment due to their low crack resistance and low hardness of chromium carbides. The aim of this work was to increase a durability of that equipment by using of flux cored electrodes with reaction components of pure metal powders, which leads to forming the fine-grained structure with increased hardness. Powders of Ti, Mo, B4C and their combinations were used. Structures of the hardfacing coatings were investigated by method of metallography, scanning electron microscopy (SEM). Abrasion wear tests were held under condition of fixed and non-fixed abrasion. Using of pure metal powders led to formation of a fine-grained structure with grains of Mo2FeB2 that forms around TiC, which work as modifier. It was investigated that the researched material based on Fe-Ti-Mo-C-B system that was used for increasing the wear resistance of junk mills led to increasing of the TBO period in 1.5-1.6 times comparing with serial hardfacing materials based on tungsten.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2021, 4, 1; 132--141
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterising and testing European business cycles asymmetry
Autorzy:
Kovacic, Zlatko J.
Vilotic, Milos
Powiązania:
https://bibliotekanauki.pl/articles/1833820.pdf
Data publikacji:
2017-09-30
Wydawca:
Instytut Badań Gospodarczych
Tematy:
business cycle
asymmetry
Mills test
Mira test
Sichel test
Opis:
Research background: One of business cycles stylised facts is that contractions are shorter than expansions, but less persistent, more volatile, and therefore asymmetric. Investigating existence and type of business cycles asymmetry is important for analysis of economic policy and statistical modelling. Economic implication of business cycles asymmetry is that economic policy should be different in a period of contractions than in one of expansion. Statistical implication is that linear models of business cycles cannot capture this stylised fact. Purpose of the article: The article has two objectives: extend the literature on the business cycles asymmetry by testing data from 36 European countries including countries never been analysed before and test robustness of the results to extraction methods and asymmetry tests used. Methods: Quarterly GDP series from Eurostat database covering period 2000q1?2016q3 were used with two exceptions. In the case of Bosnia and Herzegovina and Montenegro quarterly industrial productions indexes were used. Series were prepared by removing seasonal component using X13-ARIMA procedure. To assess robustness of asymmetry tests results to alternative methods of detrending business cycles were extracted using two filters: Corbae-Ouliaris ideal band filter and double Hodrick-Prescott filter. For testing the deepness and steepness asymmetry of the business cycles three tests were used: Mills, Mira and Sichel tests. Findings & value added: Weaker evidence of deepness asymmetry was found in Cyprus, Montenegro and Turkey cycles, where all three tests statistics for both filters have a negative sign. However, only for one of the tests in each country the result was statistically significant. For two other countries, Germany and Sweden, four out of six tests indicated deepness asymmetry, but only one of these tests results was statistically significant. Most of the cycles show steepness asymmetry, with the exception of Ireland business cycles, and to a certain extent cycles of Poland, Malta, Montenegro and Spain.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2017, 12, 3
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teoria elit Charlesa Wrighta Millsa w perspektywie współczesnych procesów regresu demokracji
Charles Wright Mills’ Elite Theory in the Perspective of Contemporary Processes of Democratic Regression
Autorzy:
Potulski, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2154715.pdf
Data publikacji:
2022-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
: demokracja
socjologia polityki
Charles Wrigt Mills
centralizacja władzy
społeczeństwo masowe
democracy
political sociology
centralization of power
mass
society
Ch.Wright Mills
Opis:
Celem tego artykułu jest przybliżenie prac Charlesa Wrighta Millsa, przede wszystkim jego trylogii, będącej krytyką współczesnych Millsowi amerykańskich elit: The new man in power: America’s labor leaders (1948), White collar: The American Middle classes (1951) i The power elite (1956). Mimo iż upłynęło przeszło półwieku od pierwszej publikacji tych prac, wnioski, jakie wysunął Mills, wydają się nam nadal aktualne. Mills w swoich pracach analizował negatywne aspekty będące efektem rozwoju nowoczesnego społeczeństwa: masowość, zanik sfery publicznej, biurokrację czy też raczej biurokratyzację, racjonalizację oraz koncentracje władzy korporacyjnej w rękach „elit władzy”. To wszystko powoduje, że myśl Millsa jest nadal aktualna. W artykule podjęta została próba wskazania na uniwersalny charakter teorii elit Millsa i wykorzystanie jej do wyjaśnia przyczyn współczesnych procesów regresu demokracji.
The aim of the article is to present the works of Charles Wright Mills, primarily his trilogy that criticizes contemporary American society and elites: The New Men in Power, White Collar: The American Middle Classes, and The Power Elite. Although more than half a century has passed since the first publication of these works, the conclusions made by Mills seem to be still valid for us. In his works Mills described the negative aspects resulting from the development of modern society: mass society, disappearance of the public sphere, bureaucratization and concentration of corporate power in the hands of the “power elite”. All this means that Mills’ thought is still relevant. The article attempts to indicate the universal nature of Mills’ elite theory and use it to explain the causes of contemporary processes of democratic regression.
Źródło:
Athenaeum. Polskie Studia Politologiczne; 2022, 74; 19-47
1505-2192
Pojawia się w:
Athenaeum. Polskie Studia Politologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a problem of Seiberg and Witten
Autorzy:
Barrett, David
Powiązania:
https://bibliotekanauki.pl/articles/1294173.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
supersymmetric Yang-Mills theory
flat vector bundles
Wrońskian
Schwarzian
Opis:
We describe alternate methods of solution for a model arising in the work of Seiberg and Witten on N = 2 supersymmetric Yang-Mills theory and provide a complete argument for the characterization put forth by Argyres, Faraggi, and Shapere of the curve $Im a_{D}/a = 0$.
Źródło:
Annales Polonici Mathematici; 1998, 70, 1; 25-34
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and types of windmills in Pomerania across the 19th century in the light of cartographic sources
Autorzy:
Prarat, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2138615.pdf
Data publikacji:
2019-08-04
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Cartography
Pomerania
natural energy source
molinology
windmills
drainage mills
Opis:
The aim of this text is to evaluate the distribution of windmills in Pomerania, an area which stretches from Gdańsk to Toruń, over the period of the nineteenth century. The basic research method was to analyse various maps from both the early nineteenth century and the late nineteenth century. The results made it possible to state that the total number windmills increased by a factor of three, and that this referred mainly to cereal mills. The number of vertical windmills with rotating caps increased at the beginning of the nineteenth century, but the number of drainage windmills remained unchanged. The very high demand for wind energy was a result of significant economic development within the Prussian partition in the second half of the nineteenth century. Cartographic sources allowed this phenomenon to be verified in the most complete way.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2019, 23, 3; 137-143
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Młyny przemysłowe : ważne ogniwo struktury sieci recyklingu pojazdów wycofanych z eksploatacji
Industrial mills : an important element in the network structure of exploited vehicles recycling
Autorzy:
Rećko, K.
Powiązania:
https://bibliotekanauki.pl/articles/311267.pdf
Data publikacji:
2013
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
młyny przemysłowe
recykling
pojazdy
eksploatacja
industrial mills
recycling
vehicles
exploitation
Opis:
W artykule przedstawiono zagadnienie systemu recyklingu pojazdów wycofanych z eksploatacji z uwzględnieniem młynów przemysłowych, jako ważnego ogniwa struktury sieci recyklingu. Przedstawiono uregulowania prawne w zakresie wymagań dla strzępiarek oraz proces strzępienia odpadów pochodzących z demontażu pojazdów wycofanych z eksploatacji, jako sposób ułatwiający ich dalsze zagospodarowanie.
The article presents the system of recycling exploited vehicles with special focus on the industrial mills as important elements of the recycling network structure. The article also discusses the legal aspects for the application of rippers. The process of shredding the waste from dismantling of exploited vehicles was described in the article as the method for facilitating waste management procedures.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 10; 229-232
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Standaryzacja jakości paliw z odpadów
Quality assurance measures for secondary fuels from solid wastes
Autorzy:
Szpadt, R.
Sebastian, M.
Powiązania:
https://bibliotekanauki.pl/articles/236574.pdf
Data publikacji:
2003
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
odpady
paliwo zastępcze
cementownia
solid wastes
secondary fuels
cement mills
Opis:
Omówiono problematykę standaryzacji jakości paliw z odpadów wykorzystywanych w cementowniach, które są obecnie ich głównym odbiorcą. W oparciu o przegląd rodzaju i właściwości paliw z odpadów, wykorzystywanych w znacznych ilościach w cementowniach zagranicznych, zaproponowano klasyfikację tych paliw wg kilku priorytetów (konsystencja, wartość opałowa, zawartość czynników szkodliwych). Z porównania przeanalizowanych danych wynika, że wymagania stawiane paliwom w różnych cementowniach są zróżnicowane, tak pod względem minimalnej wartości opałowej, jak i zawartości składników szkodliwych. Odpady, jako paliwa zastępcze (alternatywne), o niewłaściwej charakterystyce energetycznej i chemicznej, mogą zakłócać proces wypału klinkieru przez obniżenie jego temperatury, powodując pogorszenie jakości cementu. Kontrola jakości odpadów dopuszczonych do spalania przez ich użytkowników, zwłaszcza w odniesieniu do składników szkodliwych, może być bardzo uciążliwa i kosztowna. Cementownie chętnie więc będą stosować paliwa zastępcze o określonych standardach, przygotowane przez profesjonalnych producentów, gwarantujących ich skład chemiczny i właściwości paliwowe. Zaproponowana metodyka standaryzacji przyczyni się do rozwoju przetwarzania odpadów w paliwa oraz ułatwi korzystanie z tych paliw, a zwłaszcza uzyskiwanie zezwoleń na stosowanie paliw z odpadów w celu odzysku energii.
The processing and reuse of single and mixed wastes as secondary fuels requires strict measures to be taken because of the potential emissions of pollutants. And this includes quality assurance not only for secondary fuels from mixed wastes, but also for single wastes that are in use as fuel substitutes. The formulation of strict quality assurance measures will primarily enhance the processing of solid wastes for their utilization as secondary fuels. Such regulations will also be of benefit to the users, especially to those applying for a licence to make use of secondary fuels for energy recovery. The objective of our study was to establish the quality assurance scheme for waste-derived fuels used in cement mills (which are now the main buyers of these products). Based on an overview of the types and properties of the secondary fuels used in large amounts by the cement mills in different countries, a classification was proposed, which involved the following criteria: consistence, calorific value and content of hazardous components. A comparison of relevant data showed that the demands made on these fuels differed from one cement mill to another. This holds both for the minimal calorific value and for the hazardous components. When used as substitute fuel, wastes of inadequate energy efficiency and chemical parameters may seriously disturb the clinker burning process by decreasing its temperature, thus abating the quality of the cement. Quality assurance for the wastes to be used as fuels, especially the one pertaining to the hazardous components, is troublesome and expensive. Cement mills will therefore give preference to secondary fuels with quality assurance certificates, made by professionals capable of assuring an appropriate chemical composition and adequate calorific values.
Źródło:
Ochrona Środowiska; 2003, R. 25, nr 1, 1; 31-38
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wytwarzanie mikro- i nanoproszków w młynach wibracyjnych o niskiej częstotliwości drgań
Production of micro- and nanopowders in vibratory mills of low vibration frequency
Autorzy:
Sidor, J.
Powiązania:
https://bibliotekanauki.pl/articles/2070497.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
młyny wibracyjne
mielenie
mikroproszki
nanoproszki
vibratory mills
milling
powders
nanopovders
Opis:
Praca zawiera rozwiązania konstrukcyjne laboratoryjnych młynów wibracyjnych o niskiej częstotliwości drgań wibracyjnego i obrotowo-wibracyjnego oraz ich podstawowe parametry techniczne. Zawiera także informacje o uziarnieniach mikroproszków oraz nanoproszków: węglika krzemu, tlenku glinu, tlenku chromu, wodorotlenku głinu, hy-droksyapatytu, siarki, grafitu i skrobi wytworzonych w tych młynach.
Constructiona! designs of laboratory vibratory Iow frequency miHs and rotary-vibratory mills arę described. The paper contains basie technical parameters of these miHs. Information dealing with par- ticle size distribution of micro- and nanopowders such as silicate carbide, aluminum oxide, chromium oxide, aluminum hydroxide, hydroxyapatite, sulfur, graphite and starch produced in these miHs are given.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 4; 116-117
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Types of watermills on Polish rivers – assumptions in the CeBaDoM database
Autorzy:
Mosakowski, Zachariasz
Brykała, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1066173.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cultural heritage
dLibra
digitizing
historical database
molinology
science dissemination
water mills
Opis:
The article presents assumptions and research problems related to organization and dissemination as a part of the OZwRCIN project of the Central Database of Mills in Poland (CeBaDoM) implemented as a part of the Operational Program Digital Poland of the European Union. The database is open to all users and its aim is to popularize the vanishing cultural heritage. It includes a number of information: about the type of mill, its purpose, location and periods of operation. The article describes the main types of water mills, sources of information about them, as well as the composition of the structure of signature assigned to individual objects.
Źródło:
World Scientific News; 2019, 131; 75-87
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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