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Tytuł:
Two mathematical formulas for assessing seed separation efficiency
Autorzy:
Kaliniewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/297999.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
seeds
separation process
indicators
comparison
Opis:
Two mathematical formulas for assessing the efficiency of seed mixture separation were analyzed. Increases in the crop seed yield and the efficiency of impurity separation were accompanied by higher seed separation efficiency regardless of the adopted formula. One of the examined formulas carried more information, and it could be used to determine the improvement in the purity of the separated product relative to the raw material. The difference in the analyzed formulas’ ability to determine the efficiency of seed separation was minimized when the separation process was more efficient, i.e. when the value of partial indicators of separation efficiency was closer to 1. Both formulas could be successfully used to describe seed separation efficiency because in most practical applications, the error generated by the evaluated formulas did not exceed 1.5%.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(2); 109-117
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research on separation efficiency of aerosol particles in vortex tube separators with electric field
Autorzy:
Dziubak, T.
Powiązania:
https://bibliotekanauki.pl/articles/202024.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vortex tube separator
electric fields
separation efficiency and filtration performance
pressure drop across the cyclone separator
experimental research
Opis:
A comparative analysis of filtration performance of tangential and axial inlet reverse-flow cyclone separators and vortex tube separators is presented. The study showed that vortex tube separators are characterized by a quality factor q several time higher than tangential inlet reverse-flow cyclone separators. The cyclone separators yield low separation efficiency and low filtration performance at low air flow rates at low air volumes aspired by the engine at low speed. One of the well-known and not commonly used methods to improve separation efficiency is to apply electric field. An original design of a vortex tube separator with insulators generating electric field in the area of aerosol flow is presented. High voltage was applied to the cyclone separator housing and its swirl vane. A special method and test conditions were developed for cyclone separators with electric field. Separation efficiency, filtration performance and pressure drop across the cyclone separator in two different variants were determined. The tests were carried out at five inlet velocity of cyclones υ0 = 1.75; 3.5; 7.0; 10.5; 14 m/s at an extraction rate of m0 = 10%, and at an average dust concentration in the inlet air of s = 1 g/m3. Using the electric field in the area of a swirling aerosol stream resulted in an increase (over 12% – φ c = 96.3%) in separation efficiency at inlet velocity of cyclone ranging from 1.75 to 3.5 m/s. An increase in separation efficiency at other inlet velocity of cyclone is minor and does not exceed 3‒4%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 503-516
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced separation efficiency of low–rank coal using waste engine oil as a flotation collector
Autorzy:
Li, Ming
Xia, Yangchao
Guo, Fangyu
Rong, Guoqiang
Li, Guosheng
Xu, Baolin
Xing, Yaowen
Gui, Xiahui
Powiązania:
https://bibliotekanauki.pl/articles/109613.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low rank coal
engine oil
waste engine oil
flotation
Opis:
Because of the rich oxygen-containing functional groups and developed pores on the Surface of low-rank coal, it is difficult to realize efficient separation during low-rank coal flotation using common oil collectors. Waste engine oil (WEO) is abundant in polar oxygen-containing functional groups and could be an alternative collector. In this study, the effect of WEO on low-rank coal floatation was assessed and engine oil (EO) was also used for comparison. The results show that the separation efficiency of low-rank coal can be significantly improved using WEO; additionally, 96.73% of the clean coal yield can be obtained when the WEO dosage was only 4 kg/t. Compared with EO, the bubble–particle induction time in the presence of WEO shortened from 430 to 220 ms. Moreover, more low-rank coal particles were captured and adhered to the bubble surface using WEO, which indicated a higher probability of bubble–particle attachment. Nonpolar components, polar components and metal ions synergistically promote the flotation separation enhancement of low-rank coal using WEO.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 252-263
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic modelling and optimization of flotation process of electrum
Autorzy:
Aydın, Ş. Beste
Gül, Alim
Powiązania:
https://bibliotekanauki.pl/articles/2146860.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
electrum
flotation
separation efficiency
kinetic models
Opis:
The investigation of flotation as an alternative method to cyanide leaching of gold ores is significant in terms of economic and environmental aspects. In this study, a gold ore sample containing 4.79 ppm Au and 7.72 ppm Ag was used. Gold and silver were observed to be present as liberated electrum or associated with or within quartz, galena, and sphalerite. Initially, five-stage rougher flotation tests were conducted, and then three-stage scavenger circuits and four-stage cleaning flotation circuits were performed in order to obtain high-content gold concentrate and decrease losses of Au and Ag in tailings. As a result of tests, the flotation concentrate assayed as 437 ppm Au and 511 ppm Ag was obtained with recoveries of 76.3% and 58.5%, respectively. This study reveals that the concentrates ready for direct smelting without any additional process can be obtained with flotation. In order to determine kinetic characteristic of electrum in the sample, the tests were conducted using firstorder model, first-order model with rectangular distribution of rate constants, second-order model and second-order model with rectangular distribution of rate constant. The second-order model was considered as most reasonable for fitting the recoveries of gold as a function of flotation time during the flotation process.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 6; 80--94
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving separation efficiency of 6-1 mm coal by introducing vibration energy to dense medium gas-solid fluidized bed
Autorzy:
He, J.
Zhao, Y.
Luo, Z.
Zhao, J.
Duan, C.
He, Y.
Powiązania:
https://bibliotekanauki.pl/articles/110018.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vibration energy
dense medium gas-solid fluidized bed
fluidization quality
density uniformity
separation efficiency
Opis:
Effects of the vibration energy on the fluidization quality and separation performance of dense medium gas-solid fluidized bed were investigated experimentally. The magnetite powder with a wide size range of 0.3-0.074 mm was utilized as the basic medium solids. 6-1 mm fine coal sample from Yongcheng (China) was used to perform the separation experiments. The results indicate that the vibration amplitude A and superficial gas velocity U are greatly significant to the fluidization stability and the density distribution uniformity. Comparing with the bed without vibration, the optimal SP and Sρ values of 0.034 kPa and 0.018 g/cm3 are acquired in vibration bed with the operating factors of A = 1 mm, U = 1.8Umf, f = 15 Hz and Hs = 150 mm. The coal ash content was reduced from 27.84% to 9.50% at a separating density of 1.68 g/cm3 with a probable error E value of 0.505. The separation efficiency of 6-1mm fine coal is effectively improved by introducing vibration energy to dense medium gas-solid fluidized bed. The technology provides a novel approach to achieve high-efficiency separation of 6-1 mm fine coal in the arid and water-shortage areas.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 1; 95-108
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QSAR study of amine collectors for iron ore reverse flotation
Autorzy:
Wang, Benying
Xu, Xinyang
Duan, Hao
Wang, Xinyang
Powiązania:
https://bibliotekanauki.pl/articles/110929.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
QSAR
separation efficiency
reverse flotation
amine collectors
Opis:
In order to reveal the relationship between flotation behaviors of collectors and their structures, quantitative structure–activity relationship (QSAR) study about separation efficiency of quartz from hematite using amine collectors was performed. The genetic function approximation (GFA) algorithm was applied to generate the correlation models and model with acceptable R2 and Rcv2 (cross validated R-squared) correlation coefficients (R2=0.9666, Rcv2=0.9201) was developed. The model revealed that the Lowest Unoccupied Molecular Orbital (LUMO) energy of the molecule, the charge of nitrogen and the electronegativity of polar group were the major factors that affected the separation efficiency of collectors. The higher nitrogen charge, the larger electronegativity of polar group and the more positive of LUMO energy of amine collectors were, the higher separation efficiency would be.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1059-1069
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of microwave system location on floatability of chalcopyrite and pyrite in a copper ore processing circuit
Autorzy:
Gholami, Hamed
Rezai, Bahram
Mehdilo, Akbar
Hassanzadeh, Ahmad
Yarahmadi, Mohammadreza
Powiązania:
https://bibliotekanauki.pl/articles/109728.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave technology
chalcopyrite
pyrite
comminution circuits
separation efficiency
Opis:
The present work aims at investigating the effect of microwave local positions (i.e. before crushing (BC), after crushing (AC) and after milling (AM)) on microwave-assisted flotation of chalcopyrite and pyrite in a porphyry copper complex deposit. Individual given samples for each state were pre-treated with a variable power microwave at a power level of 90 to 900W for 15, 30, and 60s. Furthermore, froth floatation experiments were carried out using a laboratory mechanical Denver flotation cell on both microwave-treated and untreated samples. Particle surface properties were characterized by a scanning electron microscopy (SEM) and an energy-dispersive X-ray spectroscopy (EDX) analysis. The results showed that the chalcopyrite and pyrite floatabilities increased monotonically by rising the exposure time and power level for the uncrushed preconditioned samples (BC) due to the enhancement of mineral liberation degrees together with the formation of sulphide species and polysulphides on the mineral surfaces. However, flotation results of treated samples for the crushed one (AC) revealed an optimum range. Formation of intensive oxide layers on the mineral surfaces of milled samples (AM) led to a substantial reduction in their recoveries by increasing the microwave’s power level and the sample’s exposure time. The results obtained from mineral’s floatabilities in recleaner stage showed that the microwave-assisted sample at 900W for 30s at BC state favourably provided 5% higher S.E.’s than that of the untreated sample. Finally, it was concluded that the microwave pretreatment of samples induced the best floatability responses if it located before the crusher.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 3; 432-448
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on pre-concentration efficiency of wolframite from tungsten ore using gravity and magnetic separations
Autorzy:
Lu, D.
Wang, Y.
Jiang, T.
Sun, W.
Hu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/109597.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tungsten ore
pre-concentration
separation efficiency
gravity separation
magnetic separation
Opis:
Pre-concentration is effectively applied in recovering wolframite from tungsten ore, due to its benefits of further upgrading tungsten ore and improving separation efficiency. The most important pre-concentration techniques for tungsten ore include gravity separation and magnetic separation, based on the fact that there are appreciable differences, between the desired wolframite and the gangue minerals, in density and magnetic susceptibility. This study investigated the separation efficiency of gravity pre-concentration (Falcon Concentrator) and high-gradient magnetic pre-concentration (SLon VPHGMS) for the beneficiation of a Canada tungsten ore. It is a low-grade type of ore with high silica and arsenic content, and an average content of WO3 is about 0.45%. The optimum conditions for different operational parameters of two pre-concentration separators were studied on this low-grade material. The results presented in this paper suggested that although both pre-concentration techniques were effective for producing pre-concentrates containing high WO3, magnetic pre-concentration showed significantly better separation efficiency. Over 90% of the feed was rejected as the final tailings, meanwhile, over 85% of arsenic minerals were removed with tailings, while the WO3 loss was less than 15%.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 718-728
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of micro-morphology and micro-structure on fly ash triboelectrostatic beneficiation
Autorzy:
Wang, Wenping
Chen, Yinghua
Haisheng, Li
Dong, Haoran
Wang, Guanghui
Powiązania:
https://bibliotekanauki.pl/articles/1448347.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fly ash
triboelectrostatic beneficiation
micro-structure
micromorphology
separation efficiency
Opis:
Fly ash is a complex system with a variety of fine particles. The complex relationship between unburned carbon and ash particles has an important influence on the efficiency of fly ash triboelectrostatic beneficiation. The particles adhered to the two electrode plates are collected through the triboelectrostatic beneficiation experiment. The scanning electron microscopy and X-ray fluorescence are used to detect the microscopic differences between the particles of positive and negative plates. The results show that the flaky carbon particles in the raw ash and the ash particles larger than 4µm are more easily separated, while it is converse for the ash particles with particle size less than 4µm. With the particle size less than 4µm, it is gradually more obvious for the influence of adhesion caused by the roughness surface of spherical unburned carbon particles, and the surface pores structure of porous carbon particles. The binding structure between unburned carbon and ash particles is complex and changeable. It is not beneficial to improve the separation efficiency. Therefore, the micro-structure and micro-morphology have an important effect on fly ash triboelectrostatic beneficiation. Some suggestions were proposed from the microscopic point to improve the efficiency of fly ash triboelectrostatic beneficiation.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 53-63
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach in separation process evaluation. Efficiency ratio and upgrading curves
Autorzy:
Irannajad, M.
Nuri, O. S.
Allahkarami, E.
Powiązania:
https://bibliotekanauki.pl/articles/110189.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
separation efficiency
mineral processing
selectivity index
process evaluation
efficiency ratio
operation efficiency
Separation Process
Opis:
In mineral processing separation efficiency (SE), operation efficiency (OE), selectivity index (SI) and other indices have been used to evaluate the separation process. Up to now, no study has been conducted on the relationship between the SE, OE and SI indices. In this research, two upgrading curves are proposed based on the above indices for process and selectivity evaluation. The first upgrading curve is based on recovery R, SE, and OE as a function of concentrate grade. This curve has three background lines, including no upgrading line, ideal upgrading line and the ideal mixing line. The proposed upgrading curve is applicable not only for process evaluation by specification of OE and SE, but also for selectivity evaluation with the lowest difference between SE and OE. The curve showed that the recovery value is always greater than the SE and OE values. The parameters of OE, SE and R were used for plotting the upgrading curve as a function of concentrate grade taking into consideration all of them at a time. A new selectivity indicator, namely Efficiency Ratio (ER) as the selectivity parameter, is proposed as the ratio of OE to SE. The ER values fluctuate between 1 and . It can be presented as a function of concentrate and tailing grades (ER = [c(1-t)]/[1(c-t)]). The results showed that ER is insensitive to the feed grade and has the inverse relationship with SI. To measure the separation selectivity, another upgrading curve is proposed based on ER and SI parameters. This curve is divided into seven separation classes for evaluation the class of a separation process from ideal class to no separation one. The results of this research can be useful for separation process evaluation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 847-857
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Jigging Process Parameters to Beneficiate Iron Ore Fines – a Case Study of Tatasteel
Optymalizacja parametrów procesu wzbogacania w osadzarce drobnouziarnionej rudy żelaza – studium przypadku Tatasteel
Autorzy:
Shukla, Vishal
Kumar, C. Raghu
Chakraborty, D. P.
Kumar, Ashok
Powiązania:
https://bibliotekanauki.pl/articles/318528.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
osadzarka
granulometria
jakość nadawy
wysokość łoża osadzarki
wydajność
wydajność separacji
wzbogacanie żelaza
jigging
granulometry
feed quality
bed height
yield
separation efficiency
iron separation
Opis:
Jigging has a very important role in mineral processing Industry. Upgrading of Iron Ore by jigging has been an emerging trend. A detailed investigation is carried out to understand the role of jig feed distribution and process parameters during jigging operation. Noamundi jig plant data shows that variation in jig feed granulometry, feed quality and operating conditions are major contributors to fluctuation in jigging performance. At Noamundi the Jig feed size (-10.0+0.5mm) fraction is used for fines jigging operation. To understand the effect of particle size distribution on jig plant performance such as yield, separation efficiency and Fe recovery. In this context The performance of jigging was evaluated by daily average data from jig operation was used to study the influence of feed distribution on jigging performance .Coarser fraction (+6mm) has a positive influence, whereas fines fraction (-0.5mm) tends to lower performance .During Jigging rearrangements of Particles takes place due to an alternate expansion and compaction of Jig Bed .These particles are arranged by increasing density from top to bottom. During the particle stratification, Jig bed physically cut at desired horizontal particle density plant to separate the desired product. Investigation shows that optimum bed height is required at different Jig feed quality to achieve desired product quality, maximum separation efficiency and Fe recovery. This Paper will illustrate role of feed distribution and process parameters control on Jigging plant performance and deals with optimization of process parameters to recover iron value from fines.
Wzbogacanie w osadzarce odgrywa bardzo ważną rolę w przemyśle przetwórstwa minerałów. Wzbogacanie rudy żelaza w osadzarkach jest nowym kierunkiem badań nad wzbogacalnością. Przeprowadzono szczegółowe badania w celu określenia wpływu uziarnienia nadawy i parametrów procesu na efektywność procesu. Dane dotyczące wzbogacania w zakładzie Noamundi pokazują, że zróżnicowanie składu ziarnowego nadawy i warunki procesu są głównymi czynnikami wpływającymi na wahania wydajności osadzarki. W Zakładzie Noamundi do wzbogacania w osadzarce kierowana jest klasa ziarnowa (10,0–0,5 mm). Zbadano wpływ rozkładu wielkości cząstek na wydajność osadzarki, taką jak wydajność, skuteczność rozdziału i odzysk żelaza. Wydajność osadzarki oceniono na podstawie średnich dziennych danych z osadzarki przemysłowej, które wykorzystano do zbadania wpływu parametrów nadawy na wydajność. Udział grubszych ziaren (+6 mm) ma pozytywny wpływ, podczas gdy drobnych ziaren (-0,5 mm) ma tendencję do obniżania wydajności. W procesie osadzania następują zmiany gęstości łoża. Zmiana gęstości łoża następuje od góry (najniższa) do dołu (największa). Podczas stratyfikacji ziaren warstwa materiału jest rozdzielana na określonym poziomie, tak aby uzyskać produkt o pożądanej charakterystyce. Badanie wykazało, że optymalna wysokość łoża osadzarki jest różna dla różnej charakterystyki nadawy tak aby osiągnąć pożądaną jakość produktu, maksymalną wydajność separacji i odzysk Fe. W niniejszym artykule zilustrowano rolę jakości nadawy i kontroli parametrów procesu dla uzyskania wydajności osadzarki, oraz przedstawiono optymalizację parametrów procesu w celu maksymalizacji uzysku żelaza.
Źródło:
Inżynieria Mineralna; 2019, 21, 1/2; 165-170
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance characteristics of panel filters for internal combustion engine inlet air working in a two-stage configuration
Autorzy:
Dziubak, T.
Powiązania:
https://bibliotekanauki.pl/articles/243465.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
two-stage air filter
filter medium
separation efficiency
flow resistance
absorption coefficient of dust
dwustopniowy filtr powietrza
medium filtracyjne
skuteczność separacji
opór przepływu
współczynnik pochłaniania pyłu
Opis:
Air filtration conditions in a single-stage and a two-stage filtration system (multicyclone-porous panel filter) are presented. Allowable flow resistance Δpfdop values reducing the air filter service life are specified. The benefits of using a multicyclone as a first stage of air filtration, including improved mobility and extended service life, are discussed. Criteria for selecting the filter media for the automobile air intake system using an absorption coefficient of dust km determined at a specific allowable flow resistance Δpfdop are specified. New methods and conditions to determine the absorption coefficient of dust km for article filter and non-woven fabric filter in a single-stage and a two-stage filtration system are developed and presented. The separation efficiency and separation performance as well as the flow resistance characteristics of the filter set including a single cyclone and a filter element with a specially selected filter medium surface area are tested. Absorption coefficients of dust km for the tested paper filter and non-woven fabric filter were determined for an allowable flow resistance. The effects of dust particle size distribution in the air downstream of the cyclone on reducing the absorption coefficient of dust of the paper filter and non-woven fabric filter in a two-stage filtration system are shown.
Źródło:
Journal of KONES; 2018, 25, 1; 83-94
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential design improvements of a reverse flow mini-cyclone with a tangential inlet
Autorzy:
Dziubak, T.
Powiązania:
https://bibliotekanauki.pl/articles/185760.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
air filter
mini-cyclones
separation efficiency
separation performance
flow resistance
dust particle size distribution
filtr powietrza
minikomocyklony
skuteczność separacji
wydajność separacji
opór przepływu
rozkład wielkości cząstek pyłu
Opis:
This paper presents an effect of general dimensions of a reverse flow mini-cyclone with a tangential inlet on its separation efficiency. Several mini-cyclone design modifications are presented and evaluated for use in the air filtration systems of motor vehicles. Local design improvements of three components of a reverse flow mini-cyclone with a tangential inlet D-40 of an air filter fitted in an all-terrain vehicle engine were introduced. An asymmetric curvilinear shape of an outlet port was used instead of a symmetrical shape. An outlet vortex finder inlet port shape was streamlined, and a cylindrical outlet vortex finder of the cyclone was replaced with a conical one. Experimental evaluation of the effects of the design improvements of mini-cyclone on its separation efficiency and performance as well as flow resistance was carried out. Separation efficiency of the cyclone was determined using the mass method as a product of dust mass retained by the mini-cyclone and supplied to the mini-cyclone in a specified time. Separation performance of the cyclone was determined as the largest dust particle dz =dzmax in a specific test cycle in the cyclone outlet air stream. A polydisperse PTC-D test dust used in Poland, a substitute for AC-fine test dust was used. Dust concentration at the mini-cyclone inlet was kept at 1 g/m3. The size and total number of dust particles in the air stream at the outlet of the original mini-cyclone and at the outlet of the improved mini-cyclone was determined using a particle counter.
Źródło:
Chemical and Process Engineering; 2018, 39, 1; 15--31
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Membrane gas separation module with pulsed retentate for low-permeable component recovery
Autorzy:
Battalov, Stanislav V.
Trubyanov, Maxim M.
Puzanov, Egor S.
Sazanova, Tatyana S.
Drozdov, Pavel N
Vorotyntsev, Ilya V.
Powiązania:
https://bibliotekanauki.pl/articles/185429.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
membrane gas separation
unsteady-state operation
process intensification
separation
efficiency
membrane module
separacja gazów membranowych
operacja niestabilna
intensyfikacja procesu
separacja
wydajność
moduł membranowy
Opis:
The paper presents the experimentalstudy of a novel unsteady-statemembrane gas separation approachfor recovery of a slow-permeant component in the membrane module with periodical retentate with-drawals. The case study consisted in the separation of binary test mixtures based on the fast-permeantmain component (N2O, C2H2) and the slow-permeant impurity (1% vol. of N2)using a radial counter-current membrane module. The novel semi-batch withdrawal technique was shown to intensify theseparation process and provide up to 40% increase in separation efficiency compared to a steady-stateoperation of the same productivity.
Źródło:
Chemical and Process Engineering; 2019, 40, 1; 57--65
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodology of the efficiency factors of fine grained clayish suspensions separation in multileveled hydrocyclone systems
Metodyka oceny dokładności rozdziału drobno uziarnionych zawiesin ilastych w wielostopniowych układach hydrocyklonów
Autorzy:
Nowak, A.
Surowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/963997.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wielostopniowe układy klasyfikacji
hydrocyklony o małych średnicach
ostrość klasyfikacji
aproksymacja krzywej rozdziału
multileveled classification systems
small diameter hydrocyclones
classification efficiency
partition curve approximation
Opis:
The necessity of obtaining many types of products of various granulation requires - more than in case of majority of other processes of mineral processing - constructing complex, multileveled technological systems of classification. They may consist of operations conducted by means of classifying devices of various types or devices of the same type and the same or various constructing parameters. The paper presents the results of three-staged process of suspension separation of solid phase granulation < 60 μm in two series of investigation conducted in hydrocyclones of the cylindrical part diameter D = 30 mm. The effects of classification as separation efficiency, yields and losses of finest fractions in separation products, sizes of given separation particles and factors of separation efficiency were compared in case when the diameters of hydrocyclones underflow nozzles were the same for each classification stage and in case when these diameters were bigger for each individual separation level. The main purpose of the paper was the attempt of describing real separation curves obtained experimentally by model functions for various work conditions of hydrocyclones systems. To determine the characteristics of separation the approximation functions were used to approximate the separation curves. They were function describing Weibull distribution function for the experimental series “a” (equation 8) and function describing logistic distribution function for experimental series “b” (equation 9). Basing on the approximated separation curves the factors of separation efficiency were calculated, which were probable error (Ep), imperfection (I), characteristic particles (d25, d75) and cut points (d50). The yields of fractions < 20 μm and < 2 μm were calculated in hydrocyclones overflows. It was stated that it is impossible to obtain very high (like > 80%) contents of ultrafine fraction < 2 μm in overflow of nth separation level - even by high yields of this fraction in individual overflows and high separation efficiency - if the contents of this fraction in the feed of 1st classification level is very small. Applying the Hancock equation (1) the technological efficiency of obtaining fraction < 20 μm and < 2 μm in hydrocyclones overflows was calculated.
Konieczność uzyskiwania całego szeregu gatunków produktów różniących się uziarnieniem wymaga - w znacznie większym stopniu niż w przypadku większości innych procesów przeróbczych - budowania złożonych, wielostopniowych układów technologicznych klasyfikacji. Mogą się one składać z operacji realizowanych przy użyciu urządzeń klasyfikujących różnych typów, bądź też urządzeń tego samego typu o takich samych lub różnych parametrach konstrukcyjnych. W pracy przedstawiono wyniki badań trójstopniowego procesu rozdziału zawiesiny o uziarnieniu fazy stałej < 60 μm w hydrocyklonach o średnicy części cylindrycznej D = 30 mm w dwóch seriach badań. Porównano efekty klasyfikacji m.in. takie jak: skuteczność rozdziału, uzyski i straty klas najdrobniejszych w produktach rozdziału, wielkości otrzymywanych ziaren podziałowych i wskaźniki dokładności rozdziału w przypadku gdy średnice dysz wylewowych hydrocyklonów były takie same w każdym stopniu klasyfikacji oraz w przypadku gdy średnice te zwiększały się w kolejnych stopniach rozdziału. Zasadniczym celem pracy była próba opisu rzeczywistych krzywych rozdziału uzyskanych z doświadczeń funkcjami modelowymi dla różnych warunków pracy układu hydrocyklonów. Do wyznaczenia charakterystyk rozdziału użyto funkcji aproksymujących empiryczne krzywe rozdziału. Były to: funkcja opisująca dystrybuantę rozkładu Weibulla dla doświadczeń serii „a” (wzór 8) i funkcja opisująca dystrybuantę rozkładu logistycznego dla doświadczeń serii „b” (wzór 9). W oparciu o aproksymowane krzywe rozdziału wyliczono wskaźniki ostrości rozdziału: rozproszenie prawdopodobne (Ep), imperfekcję (I) oraz ziarna charakterystyczne (d25, d50 i d75). Wyliczono uzyski klasy < 20 μm i klasy < 2 μm w przelewach hydrocyklonów. Stwierdzono, że nie jest możliwe otrzymanie bardzo wysokiej (np. > 80%) zawartości klasy bardzo drobnej < 2 mm w przelewie n - tego stopnia rozdziału, - nawet przy wysokich uzyskach tej klasy w kolejnych przelewach i wysokiej dokładności rozdziału - jeżeli zawartość tej klasy w nadawie I-go stopnia klasyfikacji jest bardzo mała. Korzystając ze wzoru Hancocka (1) wyliczono technologiczną skuteczność wydzielenia klasy < 20 μm i < 2 μm w przelewach hydrocyklonów.
Źródło:
Archives of Mining Sciences; 2013, 58, 4; 1209-1220
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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