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Wyszukujesz frazę "response surface methodology" wg kryterium: Temat


Tytuł:
Wpływ warunków termomechanicznej regeneracji miału gumowego na właściwości otrzymywanych regeneratów gumowych
Effect of the conditions of thermomechanical reclaiming of ground tire rubber on the properties of reclaimed rubber materials
Autorzy:
Formela, K.
Bogucki, M.
Stączek, P.
Powiązania:
https://bibliotekanauki.pl/articles/947023.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
odpady gumowe
recykling materiałowy
wytłaczanie dwuślimakowe
metoda powierzchni odpowiedzi
rubber
material recycling
twin-screw extrusion
response surface methodology
Opis:
Termomechaniczną regenerację miału gumowego (GTR) prowadzono przy użyciu współbieżnej wytłaczarki dwuślimakowej. Zastosowanie metody powierzchni odpowiedzi RSM (ang.: Response Surface Methodology) pozwoliło na scharakteryzowanie wpływu warunków termomechanicznej regeneracji odpadów gumowych (temperatury cylindra wytłaczarki, prędkości obrotowej ślimaków oraz wydajności wytłaczania) na przebieg procesu regeneracji (moment obrotowy) oraz właściwości otrzymanych regeneratów (zawartości ekstraktu acetonowego, zawartości frakcji zolowej, lepkości Mooneya, przyrostu momentów skrętnych, optymalnego czasu wulkanizacji). Stwierdzono, że najistotniejszym czynnikiem wpływającym na przebieg termomechanicznej regeneracji miału gumowego oraz na jakość otrzymanych regeneratów jest temperatura cylindra wytłaczarki.
Thermomechanical reclaiming of ground tire rubber (GTR) was performed using a co-rotating twin screw extruder. Based on response surface methodology (RSM) the influence of reclaiming conditions (temperature of barrel, screw rotational speed, feed rate) on the processing (screw torque) and properties of reclaimed rubber (acetone extract content, sol fraction, Mooney viscosity, torque increment ΔM and optimal vulcanization time) were determined. It was found that barrel temperature is the main factor affecting the thermomechanical reclaiming process and quality of reclaimed rubber.
Źródło:
Polimery; 2015, 60, 1; 57-65
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valorization of Banana Bunch Waste as a Feedstock via Hydrothermal Carbonization for Energy Purposes
Autorzy:
Sulaiman, Sani Maulana
Nugroho, Gunawan
Saputra, Hendri Maja
Djaenudin
Permana, Dani
Fitria, Novi
Putra, Herlian Eriska
Powiązania:
https://bibliotekanauki.pl/articles/27323833.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
response surface methodology
hydrothermal carbonization
banana bunch waste
Opis:
In this article, the potential use of banana bunch waste (BBW) as a source of bioenergy through hydrothermal carbonization (HTC) was investigated. BBW, a byproduct of banana production, is difficult to use as a fuel due to its low density and carbon ratio. However, its high lignocellulose content indicates its potential as a bioenergy source. To determine the optimal HTC conditions, an experiment was conducted using temperature, water to feedstock ratio, and processing time, with the RSM Box-Behnken method used to produce 15 trial formulations. Energy value and mass yield data were collected to determine the optimal values for both. The main parameter affecting energy yield was found to be the water to feedstock ratio, and the optimal conditions were determined to be a temperature of 180 °C, a water to feedstock ratio of 1.5:1, and a processing time of 15 minutes. The highest energy yield of 99.7% was observed under these conditions, while the lowest mass yield of 25.30% was observed at a temperature of 200°C with a water ratio of 2 and a time of 15 minutes. The heating value of the HTC solid product ranges from 17–27 MJ/kg, which is comparable to low-grade sub-bituminous coal, indicating potential for co-firing with coal and other hydrothermal products as a fuel.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 61--74
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Petroleum Refinery Wastewater by Graphite–Graphite Electro Fenton System Using Batch Recirculation Electrochemical Reactor
Autorzy:
Kassob, Ali Nadhum
Abbar, Ali Hussein
Powiązania:
https://bibliotekanauki.pl/articles/2202176.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
advanced oxidation process
COD removal
electro-Fenton
porous graphite
response surface methodology
Opis:
Water pollution and the lack of access to clean water are general global problems that result from the expansion of industrial and agricultural activities. Petroleum refinery wastewaters are considered as a major challenge to the environment and their treatment is mandatory. The present work investigated the removal of chemical oxygen demand (COD) from petroleum refinery effluents generated from the Al-Dewaniya petroleum refinery plant located in Iraq by utilizing a novel graphite–graphite electro-Fenton (EF) system. The electrochemical reactor was a tubular type with a cylindrical cathode made from porous graphite and concentric porous graphite rode acts as an anode. By adopting the response surface methodology (RSM), the impacts of different operating variables on the COD removal were investigated. The optimal conditions were a current density of 25 mA/cm2, FeSO4 concentration of 1.4 mM, and electrolysis time of 90 minutes, which resulted in the COD removal efficiency (RE%) of 99% at a specific energy consumption (SEC) of 10.34 kWh/kg COD. The results indicated that both current density and concentration of FeSO4 have a major impact on the elimination of COD, while time has a minor effect. The adequacy of the model equation was demonstrated by its high R2 value (0.987). The present work demonstrated that the graphite–graphite EF system could be considered as an effective approach for removing of COD from petroleum refinery wastewaters.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 291--303
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Municipal Wastewater Using Electrocoagulation Process
Autorzy:
Abshishek, H.
Vijayakumar, H.
Mahesh Kumar, C L
Shwetha, Kotagi Girisha
Powiązania:
https://bibliotekanauki.pl/articles/27314889.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
electrocoagulation
municipal sewage
central composite design
CCD
response surface methodology
total suspended solids
TSS
elektrokoagulacja
ścieki komunalne
kompozyty
metodologia powierzchni odpowiedzi
RSM
zawiesiny
Opis:
Treatment of Municipal wastewater by Electrocoagulation (EC) process using punched aluminium and zinc electrodes was studied in a batch EC cell reactor. Response surface methodology (RSM) based on Central Composite Design (CCD) was utilized to optimize the operating parameters for the removal of % Total Suspended Solids (TSS) and % Chemical Oxygen Demand (COD) from Municipal Sewage. Effect of operating parameters such as Electrode Distance (x1), Electrolysis Time (x2) and Voltage (x3) has been optimized for the removal of TSS and COD. The prediction of removal percentage of TSS and COD in various Operational circumstances is done by using Quadratic model. The significance of each operating parameter was computed by Analysis of variance (ANOVA). To achieve the maximum removal of % TSS and % COD, the optimum conditions were Electrode distance(x1)-3 cm, Electrolysis Time (x2)-70.299 minute and Voltage (x3)-6.5V. It was observed that the performance of electrocoagulation process increased up to 61.45% for COD removal, and 73.73% for TSS removal using punched electrode compared to plane electrodes.
Źródło:
Civil and Environmental Engineering Reports; 2023, 33, 4; 1--13
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of response surface methodology for reliability estimation of composite engineering structures
Autorzy:
Winkelmann, K.
Górski, J.
Powiązania:
https://bibliotekanauki.pl/articles/279525.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
reliability
response surface methodology
composite panel
Opis:
Stability loss is one of the key issues in the analysis of shells made of composite materials. This paper aims at finding the variation of the critical or limit value of the load resulting from geometric imperfections. An axially compressed 16-layer cylindrical panel model is considered. The imperfections of the panel are simulated as random fields. The parameters of these fields are used as the basic variables of the reliability problem of the model. The reliability analysis is based on the Response Surface Methodology (RSM). On the basis of the derived equation of the response surface, a reliability index of the model is determined using an author’s program – both the Monte Carlo method (MC) and the Hasofer-Lind- -Rackwitz-Fiessler (HLRF) reliability index formulation analyses.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 1019-1032
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Treatment of Hospital Wastewater Using Electrocoagulation Process – Analysis by Response Surface Methodology
Autorzy:
Salah Al-Shati, Ahmed
Alabboodi, Khalid O.
Shamkhi, Hassan A.
Abd, Zahraa N.
Emeen, Sara I. Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/2202336.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
electrocoagulation
RSM
response surface methodology
COD removal
Opis:
Electrocoagulation (EC) can be defined a method utilized to remove pollutants from wastewater by applying an electric current to sacrificial electrodes. Many experimental variables like NaCl content (0–4 g/l), current density (5–25 mA/cm2), time (30–90 mins), and pH (4–10) that influence the removal efficiency regarding COD were considered. In the presented research, three distinct configurations related to electrodes, i.e. Al-Al, Fe-Al, and Fe-Fe, have been utilized to determine which was the most effective. RSM depending on BBD was utilized for optimizing various operational parameters with regard to HWW by use of EC. Maximum COD removal (97.9%) was reached at Fe-Al electrodes, NaCl (3.2 g/l), current density (24.7 mA/cm2), time (81.7 mins), and pH (7.4). COD removal (91.3%) was achieved at the Al-Al electrodes, NaCl (3.8 g/l), current density(23.5 mA/cm2), time-86.3 min, and Ph (7.7). At the Fe-Fe electrodes, the removal of COD (89.5%) was obtained at NaCl (2.3 g/l), current density (24.6 mA/cm2), pH 8.5, and time (86.9 min). This indicates that EC could remove pollutants from different types of wastewaters under many operating parameters and with arrangements of electrodes.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 260--276
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Boron-Doped Diamond and Platinum Anodes in the Three-Compartment Electrochemical Pretreatment of Stabilized Landfill Leachate – Response Surface Methodological Approach
Autorzy:
Bagastyo, Arseto Yekti
Anggrainy, Anita Dwi
Rosyidah, Badriyah
Powiązania:
https://bibliotekanauki.pl/articles/2202300.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
boron-doped diamond
electrochemical process
leachate pretreatment
platinum
response surface methodology
Opis:
Stabilized landfill leachate contains high fractions of refractory organics that cannot be effectively degraded by simple biological or physicochemical treatment. Thus, primary treatment was required to improve biodegradability and enhance treatment efficiency. This study investigated the role of Boron-Doped Diamond (BDD) and platinum (Pt) anodes at a current density of 29.2 and 33.3 mA/cm2 in the electrochemical processes for the pretreatment of stabilized leachate. A three-compartment electrochemical reactor was used in the research to enhance the removal of ionic pollutants. The pollutants were measured as total dissolved solids (TDS), chemical oxygen demand (COD), ammonium-nitrogen (NH4–N), and nitrite (NO2–). The reactor performance was then analyzed using a regular two-level factorial design. The results showed that the electrochemical process effectively removed organic and inorganic pollutants. The highest removal was obtained at 33.3 mA/cm2 using the BDD, measured around 48, 82, 60, and 79% for TDS, COD, NH4–N, and NO2–, respectively. Meanwhile, the specific energy consumption for COD removal was estimated to reach 1.5 and 1.55 Wh/g for BDD and Pt, respectively. These results imply that the type of anodes and applied current densities significantly influence the treatment efficiency.
Źródło:
Journal of Ecological Engineering; 2022, 23, 12; 50--60
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The optimization of the dielectric layer photonic crystal filter by the quadratic response surface methodology
Autorzy:
Yang, H.
Meng, S
Wang, G.
Huang, C.
Powiązania:
https://bibliotekanauki.pl/articles/174592.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optimization
photonic crystal filter
response surface methodology
Opis:
Dielectric layer photonic crystal filter structures in waveguide are optimized by the quadratic response surface methodology. The optimization model of the filter is established on the basis of the analysis which is conducted with the aid of the response surface methodology. The model is solved using sequential quadratic programming and the optimal parameters are obtained. Examples demonstrate it is effective.
Źródło:
Optica Applicata; 2015, 45, 3; 369-379
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Relationship between the Drape and Characteristics of Fabric Using Graphic Methodology and the AHP Method
Badanie związku między układalnością a właściwościami tkaniny z wykorzystaniem metodologii graficznej i metody AHP
Autorzy:
Hamdi, Thouraya
Ghith, Adel
Fayala, Faten
Powiązania:
https://bibliotekanauki.pl/articles/2056312.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
drape parameters
response surface methodology
fabric properties
AHP
parametry układania
metodologia powierzchni odpowiedzi
właściwości tkaniny
Opis:
This research aimed to increase knowledge of the various responses of drape parameters to different selected fabric properties. The principal goal is to optimise the fabric properties and obtain the desired draping effect for garment textiles by the graphic method and AHP method. The goal is to establish a model that reflects the impact of fabric properties, such as the bending rigidity in the warp, weft and skew directions, shear stiffness, weight, and thickness on drape parameters such as the drape coefficient (CD), number of folds (NF), folding depth index (FDI) and draped distance ratio (DDR).
Badania miały na celu poszerzenie wiedzy na temat wpływu właściwości tkanin na ich układalność. Głównym celem pracy była optymalizacja właściwości tkanin i uzyskanie pożądanego efektu drapowania tekstyliów odzieżowych metodą graficzną i metodą AHP. Celem było stworzenie modelu, który odzwierciedla wpływ właściwości tkaniny, takich jak: sztywność zginania w kierunkach osnowy, wątku i skosu, sztywność ścinania, waga i grubość na parametry układania, takie jak: współczynnik układania (CD), liczba fałdy (NF), wskaźnik głębokości składania (FDI) i współczynnik odległości drapowania (DDR).
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 5 (149); 37--45
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of optimization of colored wastewater treatment by Fenton’s reagent (Part I)
Badania w celu optymalizacji oczyszczania ścieków barwnych odczynnikiem Fentona (część I)
Autorzy:
Barbusiński, K.
Amalio-Kosel, M.
Pieczykolan, B.
Płonka, I.
Fajkis, S.
Powiązania:
https://bibliotekanauki.pl/articles/125750.pdf
Data publikacji:
2013
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
advanced oxidation processes
Fenton's reagent
dye wastewater
response surface methodology
metody pogłębionego utleniania (AOPs)
odczynnik Fentona
ścieki barwne
metoda powierzchni odpowiedzi
Opis:
The constant industry development results in the increase of number and diversity of substances deposited with wastewater. Moreover, requirements for wastewater utilization are constantly restricted, thus there is the need of treatment methods improvement. In recent studies significant attention is devoted to advanced oxidation processes (AOPs), in which highly reactive radicals able to treat concentrated, hardly degradable and toxic industrial wastewaters are generated. Colored wastewaters produced during industrial processes usually characterize with significant content of refractive organic compounds which additionally posses mutagenic and cancerogenic properties. Classical treatment methods of such wastewaters (e.g. sorption, coagulation) hardly ever guarantee efficient dyes degradation. Thus, the treatment of colored wastewater with the use of one of AOP ie Fenton reagent was performed. First, preliminary studies focused on the influence of H2O2 dose, initial pH value, reaction time and Fe2+/H2O2 weight ratio on treatment effect were performed. Obtained results will be further used for development of crucial studies plan in which Surface Response Method will be used. The study will allow to formulate mathematical models describing changes of wastewater decolorization effects as a function of investigated parameters. Thus, the optimization of the process will be possible.
W wyniku ciągłego rozwoju przemysłu wzrasta ilość i różnorodność zanieczyszczeń odprowadzanych ze ściekami. Ponadto wymagania dotyczące unieszkodliwiania ścieków ulegają ciągłym zaostrzeniom, dlatego istnieje duża potrzeba doskonalenia metod oczyszczania. W ostatnich latach dużą uwagę poświęca się badaniom i wdrażaniu tzw. metod pogłębionego utleniania, które polegają na generowaniu wysoko reaktywnych rodników mających zdolność oczyszczania stężonych, trudno degradowanych i toksycznych ścieków przemysłowych. Ścieki barwne powstające w wyniku procesów produkcyjnych zazwyczaj charakteryzują się dużą zawartością trudno rozkładalnych związków organicznych, mających często charakter muta- i kancerogenny. Klasyczne metody oczyszczania takich ścieków (np. koagulacja, sorpcja) rzadko umożliwiają skuteczną degradację barwników, dlatego przeprowadzono oczyszczanie ścieków barwnych, wykorzystując jedną z metod pogłębionego utleniania odczynnik Fentona. W pierwszej kolejności przeprowadzono badania wstępne, mające na celu określenie wpływu wielkości dawki H2O2, początkowej wartości pH, czasu reakcji oraz wartości stosunku masowego Fe2+/H2O2 na efekty odbarwiania ścieków. Uzyskane w ten sposób wyniki były następnie podstawą do opracowania planu badań właściwych, prowadzonych przy użyciu tzw. metody powierzchni odpowiedzi. Na podstawie wyników tych badań opracowane zostaną modele matematyczne zmian efektów odbarwiania ścieków w funkcji badanych czynników, umożliwiające przeprowadzenie optymalizacji tego procesu.
Źródło:
Proceedings of ECOpole; 2013, 7, 1; 23-27
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady - state characteristics of extrusion cooking of maize grits
Autorzy:
Plewa, J.
Powiązania:
https://bibliotekanauki.pl/articles/1371760.pdf
Data publikacji:
1992
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
extruded maize grit
human nutrition
food
response surface methodology
extrusion-cooking
maize grit
process operation
feed moisture content
quality
Źródło:
Polish Journal of Food and Nutrition Sciences; 1992, 01, 3; 37-49
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust parameter design using the weighted metric method - The case of 'the smaller the better'
Autorzy:
Ardakani, M. K.
Noorossana, R.
Niaki, S. T. A.
Lahijanian, H.
Powiązania:
https://bibliotekanauki.pl/articles/907855.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wnioskowanie decyzyjne
estymacja regresji
metodologia oceny powierzchni
metoda metryczna
multiobjective decision making
regression estimation
response surface methodology
robust parameter design
weighted metric method
Opis:
In process robustness studies, it is desirable to minimize the influence of noise factors on the system and simultaneously determine the levels of controllable factors optimizing the overall response or outcome. In the cases when a random effects model is applicable and a fixed effects model is assumed instead, an increase in the variance of the coefficient vector should be expected. In this paper, the impacts of this assumption on the results of the experiment in the context of robust parameter design are investigated. Furthermore, two criteria are considered to determine the optimum settings for the control factors. In order to better understand the proposed method and to evaluate its performances, a numerical example for the case of 'the smaller the better' is included.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 1; 59-68
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response surface modelling and performance evaluation of solar dryer for drying of grapes
Autorzy:
Yadav, Aditya Arvind
Prabhu, Pravin A.
Bagi, Jaydeep S.
Powiązania:
https://bibliotekanauki.pl/articles/2052236.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
solar greenhouse dryer
drying
moisture removal
solar thermal energy
response surface methodology
design of experiments
szklarnia
suszarnia słoneczna
suszenie
usuwanie wilgoci
energia słoneczna
metodologia powierzchni odpowiedzi
projektowanie eksperymentów
Opis:
The current study focuses on the performance of Solar Greenhouse Dryer for drying of grapes for raisin making in Solar Dryer and Open sun condition in Western Maharashtra. The Maharashtra state ranks first in the production of grapes, probably Western Maharashtra produces nearly 800 thousand tons of grapes every year. The major wastage of grapes is due to low sugar content, glossy appearance, shrinkage, excess water in berry, scorching and size variation. Therefore, there is a need to preserve the grapes by drying and making raisins for a non-seasonal requirement. The experiment was conducted for drying of grapes in Solar Greenhouse Dryer and Open Sun condition from 1st of April to 4th of April for 48 hours. The initial weight of the grapes to be dried was 500 grams for both Solar Greenhouse Dryer and open sun drying conditions. The experiment was conducted at Bahe, Borgaon, Tal-Walwa, Dist- Sangli, Maharashtra, India located at 17.115o N and 74.33o E. The main aim of using DOE i.e., Response Surface Modelling is to get an optimum region for drying of grapes in Solar Greenhouse Dryer, from the Surface plot; the region of maxima and minima was obtained.
Źródło:
Journal of Mechanical and Energy Engineering; 2021, 5, 2; 157-168
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response surface methodology (RSM) for optimization of chalcopyrite concentrate leaching with silver-coated pyrite
Autorzy:
Salehi, S.
Noaparast, M.
Shafaei, S. Z.
Powiązania:
https://bibliotekanauki.pl/articles/110894.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chalcopyrite
copper extraction
silver-coated pyrite
optimization
response surface methodology
Opis:
This study aims to leach copper from chalcopyrite and optimizing the leaching process, using the response surface methodology (RSM). The RSM, a D-optimal design with four factors in three levels was employed to evaluate the effect of particle size, temperature, silver-coated pyrite to chalcopyrite ratio and redox potential parameters on the copper extraction efficiency. A quadratic model was then proposed by the RSM to correlate leaching variables. The tests results indicated that the model was significant with the experimental data at a correlation coefficient (R2) of 0.96. The most important parameters of copper extraction efficiency were particle size and silver-coated pyrite-to-chalcopyrite ratio, and also the squared term of particle size (A2), temperature (B2) and redox potential (D2). In addition, the interaction between redox potential and silver-coated pyrite-to-chalcopyrite ratio (CD) was significant. It was shown that the finer the particle size the faster the leaching rate of copper. It was also indicated that by increasing silver-coated pyrite to chalcopyrite ratio of 6:1 copper recovery increased. The maximum recovery of copper (71%) was obtained for the particle size of -38 μm, 70 °C, 420 mV of redox potential, silver-coated pyrite-to-chalcopyrite ratio of 6 and leaching time of 8 hours.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 1023-1035
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response surface methodology (RSM) and its application for optimization of ammonium ions removal from aqueous solutions by pumice as a natural and low cost adsorbent
Autorzy:
Moradi, M.
Fazlzadehdavil, M.
Pirsaheb, M.
Mansouri, Y.
Khosravi, T.
Sharafi, K.
Powiązania:
https://bibliotekanauki.pl/articles/950773.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pumice
ion adsorption
response surface methodology
Opis:
This research was conducted to study the adsorption of ammonium ions onto pumice as a natural and low-cost adsorbent. The physico-chemical properties of the pumice granular were characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Modeling and optimization of a NH4+ sorption process was accomplished by varying four independent parameters (pumice dosage, initial ammonium ion concentration, mixing rate and contact time) using a central composite design (CCD) under response surface methodology (RSM). The optimum conditions for maximum removal of NH4+ (70.3%) were found to be 100 g, 20 mg/l, 300 rpm and 180 min, for pumice dosage, initial NH4+ ion concentration, mixing rate and contact time. It was found that the NH4+ adsorption on the pumice granular was dependent on adsorbent dosage and initial ammonium ion concentration. NH4+ was increased due to decrease the initial concentration of NH4 and increase the contact time, mixing rate and amount of adsorbent.
Źródło:
Archives of Environmental Protection; 2016, 42, 2; 33-43
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł

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