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    Wyświetlanie 1-15 z 15
    Tytuł:
    Transmission of M-type combined solitary wave in the birefringent fiber with comprehensive management
    Autorzy:
    Xiao, Yan
    Bai, Xiao-Qin
    Li, Chang-Yong
    Lv, Ting-Ting
    Powiązania:
    https://bibliotekanauki.pl/articles/174379.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    M-type combined solitary wave
    birefringent fiber
    fifth-order nonlinearity
    Opis:
    In this paper, we reveal the transmission properties of the M-type combined solitary wave in birefringent fiber with third-order dispersion, self-frequency shift, self-steepening, fifth-order nonlinearity and the gain (loss) effects. The numerical simulations show that the M-type solitary wave can be stably transmitted through 300 dispersion lengths via balancing the variety of effects. And it can even be stably transmitted under the condition of limited interference under a small perturbation of noise, amplitude and phase position. The results can provide certain references for there search of optical soliton communication and optical devices.
    Źródło:
    Optica Applicata; 2020, 50, 2; 241-250
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Collision–attachment law of lepidolite, feldspar and quartz with bubbles in the combined cationic and anionic collector system
    Autorzy:
    Liu, Ziyu
    Jiao, Fen
    Qin, Wenqing
    Wei, Qian
    Powiązania:
    https://bibliotekanauki.pl/articles/2175442.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    combined collector
    collision probability
    attachment probability
    three-phase contact line
    Opis:
    The purpose of this study is to explore the collision–attachment law of lepidolite, feldspar and quartz during their interaction with bubbles by particle settlement method and bubble rising method under the action of combined collector. In this study, HQ-330 and dodecylamine were used as combined collector to separate lepidolite, feldspar and quartz by flotation. It also aims to analyse the relationship between collision probability, attachment probability, formation time of three-phase contact line and flotation recovery and the main factors affecting the formation time of three-phase contact line. Experimental results show that when the pH is 7 and the combined collector dosage is 100 mg/L, the separation of lepidolite from feldspar and quartz can be achieved. In the particle settlement experiments, the correlation between collision probability and flotation recovery is low, the correlation between attachment probability and flotation recovery is positive. In the bubble rising experiments, the formation time of three-phase contact line (tTPC) is negatively correlated with flotation recovery, and the combined collector changes tTPC by changing drainage time.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155324
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cassiterite recovery from a sulfide ore flotation tailing by combined gravity and flotation separations
    Autorzy:
    Zhang, Limin
    Khoso, Sultan Ahmed
    Tian, Mengjie
    Sun, Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/1448947.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Cassiterite
    Falcon concentrator
    shaking table
    flotation
    gravity separation
    Opis:
    Cassiterite (SnO2) which is the most important Sn-containing mineral, is extensively found in large quantities in discarded tailings. The recovery of cassiterite from discarded sulfide ore flotation tailings can reduce resource wastage and environmental pollution. The gravity separation technique can recover multiple valuable minerals, such as cassiterite, whose densities considerably differ from those of their associated gangue minerals. However, its recovery efficiency rapidly decreases as the mineral particle grain size decreases. To recover the finer valuable mineral particles from gravity separation tailings, flotation separation can be used as a supplementary method. In this study, the gravity and flotation separation techniques are combined to recover cassiterite from a sulfide ore tailing. The Sn grade and recovery of the final concentrate is 31.40% and 88.05%, respectively, thus indicating a highly efficient recovery of cassiterite by using the combined gravity and flotation separation technique. This study can be an important reference for recovering cassiterite from low-Sn-grade tailings.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 206-215
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism of the combined effects of air rate and froth depth on entrainment factor in copper flotation
    Autorzy:
    Wang, Lei
    Xing, Yaowen
    Wang, Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/1449999.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    froth flotation
    copper
    entrainment
    air rate
    froth depth
    Opis:
    The effect of air rate and froth depth on the entrainment factor in flotation has been extensively studied, but further investigation on the underlying mechanism for their effect is still required. In this study, flotation tests were performed at different air rates and froth depths in a 3 $dm^3$ continuously operated cell using an artificial copper ore. The results showed that entrainment factor was affected by both air rate and froth depth, and the combined effect of these variables on entrainment factor depended strongly on the particle size. The entrainment factor increased with either increasing air rate at a relatively shallow froth or decreasing froth depth at a relatively high air rate. At a very low air rate and deep froth, higher entrainment factor was observed for mid-size and coarse particles. When the entrainment factor was correlated to the effective liquid velocity at the pulp/froth interface, the results indicated that multiple mechanisms were responsible for the effect on entrainment factor. At a relatively high air rate and shallow froth depth, entrainment factor had a linear relationship with the interface effective liquid velocity, suggesting that drag force dominated the change in the entrainment factor when air rate and froth depth were varied. At a very low air rate and deep froth, the entrainment factor for fine particles was found to correlate strongly with the interface effective liquid velocity, while the entrapment of solid particles may be the main reason for the high entrainment factor for mid-size and coarse particles under this condition.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 43-53
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled fuzzy logic and experimental design application for simulation of a coal classifier in an industrial environment
    Autorzy:
    Khoshdast, Hamid
    Soflaeian, Ali
    Shojaei, Vahideh
    Powiązania:
    https://bibliotekanauki.pl/articles/109838.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    combined modeling
    fuzzy logic
    experimental design
    coal classifier
    industry
    Opis:
    Design of experiments (DOE) is an effective method providing useful information about the interaction of operating variables and the way the total system works by using statistical analyses. However, its industrial application is limited because it is almost difficult to maintain variables in DOE matrix at desired constant levels in industrial environment. Thus, this paper aims to present a new mixed modeling method which is a combination of fuzzy logic and design of experiments methods to overcome such practical limitations. The method first uses a fuzzy model which is trained by practical data gathered from industry to predict DOE response corresponding to each run in DOE matrix. Then, a statistical parametric model is constructed for the prediction of process response to any change of operating parameters under real industrial conditions. The proposed mixed method was successfully validated by using data obtained from a coal hydraulic classifier at Zarand Coal Washing Plant (Kerman, Iran). The method also seems to be a promising tool for modeling all devices and processes in real industrial environment and allows researchers to benefit from all the advantages of experimental design and fuzzy logic methods simultaneously.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 504-515
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A flotation combined extraction process for improving the whiteness of phosphogypsum
    Autorzy:
    Li, Jiangli
    Guo, Yongjie
    Fan, Peiqiang
    Li, Haibin
    Chen, Ciyun
    Xu, Shuai
    Du, Lingpan
    Powiązania:
    https://bibliotekanauki.pl/articles/24085918.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phosphogypsum
    whiteness
    desilication
    high-value utilization
    floatation
    extraction
    Opis:
    Every year, the production of industrial phosphoric acid generates more than 100 Tg of phosphogypsum (PG), leading to significant environmental damage and the occupation of a vast amount of land space. The urgent need to explore applications for PG has become increasingly apparent. However, impurities such as organic substances, slime, phosphorite, and SiO2 reduce the whiteness of PG, making it difficult to utilize for high-value applications. To address this issue, this study employed a two-stage flotation process to remove the majority of impurities, including SiO2, organic substances, and fine slime adhered to the surface of PG particles. The raw PG sample was first sieved to remove some SiO2 particles. After flotation, sulfuric acid and tributyl phosphate were introduced to decompose the PG particles and remove the impurities wrapped inside. Following this flotation combined extraction process, the whiteness of the PG sample improved from 54.1% to 92.9%, meeting the requirements for building walls and filters.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 170043
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A combined hydrocyclone - electrocoagulation treatment for different types of industrial wastewater
    Autorzy:
    Farghaly, Mohamed G.
    Attia, H.
    Saleh, H. A.
    Ramadan, A. M.
    Abdel Khalek, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1448028.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrocyclone
    electrocoagulation
    paper industry
    iron industry
    marble industry
    granite industry
    Opis:
    Every year, a large amount of mineral processing wastewater is discharged from various industries into the environment which is considered a challenging task not only because of its large volume, but more importantly, its hazardous components, while its reuse as feedwater without proper treatments causes great harm to the final product of these industries. Cost-effective methods are required to treat a wide range of industrial wastewater in a diverse range of conditions. In this study, a combined hydrocyclone-electrocoagulation system is tried to treat the wastewater for industries with high water consumption and high pollutants such as paper industry, iron and metal forming industry, and marble industry. The effects of the hydrocyclone operational parameters, such as feed inlet pressure and diameter, vortex finder diameter, apex diameter, and feed solids content, were investigated. In the case, wastewater of paper industry, the following optimum conditions $(P = 4.5$ bar, $D_o = 15.8 mm, D_u = 6 mm, D_i = 4 mm and c_s = 2.3%)$ were achieved. An overflow of about 90.58% water recovery and 21.45% solid at 75.92% separation efficiency was obtained. The results showed that the hydrocycloneelectrocoagulation treatment has efficiently treated the three different types of industrial wastewater. The chemical oxygen demand (COD), biochemical oxygen demand (BOD), total solid (TS), total suspended solids (TSS), colour and turbidity, were reduced sharply and met the effluent discharge or reuse standards. Also, compared with the hydrocyclone-treated wastewater, the hydrocyloneelectrocoagulation-treated wastewater was found to be more enhanced.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 2; 143-155
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activation mechanism of tantalum niobium flotation by lead ions in a combined collector flotation system
    Autorzy:
    He, Mingfei
    Li, Shuangke
    Cao, Miao
    Gao, Yude
    Bu, Hao
    Meng, Qingbo
    Powiązania:
    https://bibliotekanauki.pl/articles/1448361.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    tantalum niobium ore
    Pb2+ ions activation
    ammonium dibutyl dithiophosphate
    coadsorption
    Opis:
    The effect of lead ions on the flotation activation of tantalum niobium ore (TNO) was studied by micro-flotation, adsorption capacity experiments, solution chemical composition calculations, and infrared spectral analysis. The experimental demonstrated that the combined collector of salicylhydroxamic acid (SHA) and ammonium dibutyl dithiophosphate (ADDP) resulted in a strong collection capacity for TNO in the presence of lead ions. The solution chemistry calculations determined that the dominant source of lead ions in the aqueous solution was $Pb(OH)^+$ at a pH of 8, which was conducive to the adsorption and interaction of SHA and ADDP anions. In the lead ion activation system, the combined reagent co-adsorbed onto the TNO surface, causing a large negative shift in the zeta potential. The co-adsorption mechanism of the combined collector consisted of complex chemisorption between SHA and the TNO surface active particles, while the main adsorption of ADDP is physisorption.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 29-38
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of combined Fe-Al electrodes and groundwater temperature on arsenic removal by electrocoagulation
    Autorzy:
    Mohora, Emilijan
    Rončević, Srđjan
    Agbaba, Jasmina
    Zrnić, Kristiana
    Tubić, Aleksanda
    Adžemović, Mesud
    Dalmacija, Božo
    Powiązania:
    https://bibliotekanauki.pl/articles/207130.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    arsenic
    electrocoagulation
    groundwater
    EC reactor
    arsen
    elektrokoagulacja
    wody gruntowe
    reaktor EC
    Opis:
    The removal of arsenic from groundwater by continuous electrocoagulation (EC) using combined Fe-Al electrodes at its natural temperature (16.1±0.2 °C) was comprehensively evaluated. The results obtained indicated that all studied Fe-Al electrode combinations were able to reduce As concentration below 10 μg/dm3. Nevertheless, the Fe-Fe-Al-Fe electrode combination was the most suitable due to its highest arsenic removal capacity (0.354 μg As/C) for the lowest charge loading 68.4 C/dm3. The consumption of Fe was 0.0339 kg Fe/m3 and of Al electrodes 0.0145 kg Al/m3. The operating cost was estimated at 0.182 €/m3. The increase of the groundwater temperature by 8 °C from its natural temperature influenced increase of the Fe and Al electrodes dissolution rate by 30% and 17%, respectively and that of As removal efficiency by 16%. The residual Fe and Al concentrations in 500 dm3 of treated groundwater were below WHO guideline values for drinking water. Long-term field operation of the pilot-scale continuous EC reactor is required to validate effectiveness, reliability and robustness of the EC technique for arsenic removal from groundwater confirmed in laboratory conditions.
    Źródło:
    Environment Protection Engineering; 2019, 45, 2; 5-18
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The depression mechanism on pyrite in a low-alkaline system with combined depressants : Experiment, HSC, DFT and ToF–SIMS studies
    Autorzy:
    Li, Suqi
    Yuan, Jiaqiao
    Ding, Zhan
    Li, Jie
    Yu, Anmei
    Wen, Shuming
    Bai, Shaojun
    Powiązania:
    https://bibliotekanauki.pl/articles/24085821.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pyrite
    calcium hypochlorite
    lime
    depression
    low alkaline system
    Opis:
    Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2 and CaO) on pyrite flotation with butyl xanthate (KBX). Micro-flotation experiments indicate that the addition of 200 mg/L combined depressants (a mass ratios of CaO to Ca(ClO) 2 of 2:3) and 1.0×10−3 mol/L KBX at pH 9.5 can effectively depresses the flotation of pyrite, and a minimum pyrite recovery rate of 12.5% is obtained. Basic thermodynamic evaluation results confirm the participation of Ca(ClO) 2 significantly decrease the negative Gibbs free energies of pyrite oxidation reaction. Besides, the calcium species (Ca(OH) 2, Ca2+ and Ca(Cl) 2) will spontaneously transform into CaCO3,and it is the ultimate dominant calcium species in the CO32- system. Density functional theory (DFT) results indicate that CaCO3 can chemically adsorb onto the pyrite surface with an adsorption energy of –671.13 kJ/mol. The O1 and Ca atoms mainly contribute to the bonding process and are responsible for the stable adsorption of CaCO3. ToF-SIMS results provide strong evidence that the combined depressants increase the amount of hydrophilic species and decrease dixanthogen adsorption onto the pyrite surface. The thickness of the whole formed hydrophilic species is approximately 50 nm. Semiquantitative amounts of hydrophilic species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168454
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of precast anaerobic digestion tank combined with a food waste disposer system. A case study of household food waste in Thailand
    Autorzy:
    Kanchanapiya, P.
    Jantharadej, K.
    Chavanparit, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/207201.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    food waste
    household
    fermentation tank
    anaerobic digestion
    odpady żywnościowe
    gospodarstwo domowe
    zbiornik fermentacyjny
    fermentacja beztlenowa
    Opis:
    The actual sizes of precast anaerobic digestion tanks (600 dm3) combined with food waste disposer systems (PAD-FWD) were selected to investigate efficiency under actual use conditions. The effects of organic loading rates (OLRs) and the presence of linear alkylbenzene sulfonate (LAS) surfactants in dishwashing liquid on the organic removal efficiency and biogas generation of PAD-FWD were studied. According to the findings, the PAD-FWD at an OLR of 0.13 kg VS/(m3·day) and hydraulic retention time (HRT) of 12 days could be applied to treat food waste without adding any nutrients to the system to effectively produce biogas. Under operating conditions of the LAS concentration of 63.4 mg/dm3, PAD-FWD was able to reach a steady-state condition with a performance similar to the system without added LAS. The quality of effluent from the PAD-FWD system was unable to meet the effluent standard for households; thus, this effluent should be collected for treatment in a secondary wastewater treatment plant (WTP) before release into the environment. The effluent quality at an OLR of 0.13 kg VS/(m3·day) was in the range of the influent properties of the central WTP, which ensures that the pollutants in the effluent do not increase the overall burden on the WTP. The bio-sludge from PAD-FWD was not a sufficient nutrient source for the growing plants. However, the germination index (GI) of the effluent at an OLR of 0.13 kg VS/(m3·day) did meet the fertilizer standard. The results of this study can be applied to develop self-management of food waste technology to encourage the separation of food waste at the origin within households.
    Źródło:
    Environment Protection Engineering; 2017, 43, 2; 93-108
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pullout evaluation of sawbone experiment in different types of pedicle screws combined with bone cement augmentation for severe osteoporotic spine
    Autorzy:
    Yang, S.-C.
    Liu, P.-H.
    Tu, Y.-K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307271.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osteoporoza
    kości
    wytrzymałość
    osteoporosis
    bone cement augmentation
    cannulated pedicle screw
    sawbone
    pullout strength
    Opis:
    Purpose: The conventional screw is unable to provide enough screw-bone interface strength for osteoporotic cencellous bone, and complications resulting from loosening or failure of the implants remain a significant clinical problem. Hence, the purpose of this study is to investigate pullout strength and energy in three types of the pedicle screws, including conventional solid pedicle screw, cannulated pedicle screw, and cannulated pedicle screw with a central pin, using osteoporotic sawbone test block with different bone cement volumes through pullout force testing. Methods: The control group (n = 15) of the osteoporotic sawbone test block includes groups A, B, and C to reflect three types of the pedicle screws without bone cement augmentation. The cemented group (n = 45) of the osteoporotic sawbone test block includes groups D1, D2, D3, E1, E2, E3, F1, F2, and F3 to reflect three types of the pedicle screws with PMMA bone cement of 2, 3, and 4 mL augmentation. Results: The results showed that the pullout strength and energy in the cemented group were significantly larger than that in the control group. Moreover, the best performances of the pullout strength and energy in the cemented group were evidenced obviously in the case of cannulated pedicle screw with a central pin with 4 mL bone cement augmentation. Conclusions: This study concludes that cement argumentation in the cannulated pedicle screw with a central pin can increase a pullout strength of pedicle screw for severe osteoporotic patients while bone cement of injective volume is limited.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 55-64
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New insights into the promotion mechanism of $(NH_4)_2SO_4$ in sulfidization flotation: a combined experimental and computational study
    Autorzy:
    Chen, Daixiong
    Liu, Mengfei
    Hu, Bo
    Dong, Yanhong
    Xue, Wei
    He, Peng
    Chen, Fang
    Zhu, Jianyu
    Zhang, Chenyang
    Powiązania:
    https://bibliotekanauki.pl/articles/1446762.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    malachite
    promotion
    sulfidization
    flotation
    mechanism
    Opis:
    Ammonium sulfate ((NH4)2SO4) exhibits promoting effects in malachite sulfidization flotation. However, the promotion mechanism remains poorly understood. In this study, micro-flotation tests, zeta-potential measurements, scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and materials studio simulation (DFT) were used to investigated the promotion mechanism of $(NH_4)_2SO_4$. Micro-flotation test demonstrates that the recovery of malachite from 73% increased to 83%, when the (NH4)2SO4 was added. Contact angle and zeta potential test results indicate that addition of $Na_2S•9H_2O$ changes the surface properties of malachite and provide the conditions for adsorption of butyl xanthate (BX). After promoting the sulfidization by $(NH_4)_2SO_4$, BX is more effective in improving the hydrophobicity. SEM-EDS and AFM results show that $(NH_4)_2SO_4$ can improve performance and stability of sulfidization. X-ray photoelectron spectroscopy indicates that after sulfidization, polysulfides and cuprous were appeared in malachite surface, infers that a redox reaction occurs between sulfur and copper on the surface of malachite. After addition of $(NH_4)_2SO_4$, the percentage of polysulfides and cuprous were increased, it implies $(NH_4)_2SO_4$ can accelerate the redox reaction. Computational results show that after adding $(NH_4)_2SO_4$, the adsorption energy of HS- on the malachite surface is reduced, implies that $(NH_4)_2SO_4$ can improve the stability of HS-adsorption on the surface of malachite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 5; 57-70
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous removal of SO2 and NOx from sintering flue gas using ammonia-Fe(II)EDTA combined with electrolytic regeneration
    Autorzy:
    Liang, Y.
    Yao, X.
    Quin, L.
    Chen, W.
    Han, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/208117.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ammonia
    desulfurization
    flue gases
    nitrogen oxides
    nitrogen removal
    sintering sulfur dioxide
    amoniak
    odsiarczanie
    gazy odlotowe
    tlenki azotu
    usuwanie azotu
    spiekanie
    ditlenek siarki
    Opis:
    Sulfur dioxide and nitrogen oxide are health hazardous gases, which contribute to the formation of submicron acidic particulates. To reduce SO2 and NOx emission from the sintering flue gas, the combination of ammonia-Fe(II)EDTA solution scrubbing with Fe(III) electrolytic regeneration is proposed. The above method has the following advantages: direct conversion of NOx and SO2 to harmless N2 and SO4 2−, recovery of the by-product (NH4)2SO4), simultaneous removal of NOx and SO2 emission from flue gas in the reactor. The effect of the pH, initial Fe(II)EDTA concentration, and voltage on the desulfurization and denitration efficiencies was investigated using a bench-scale reactor. The maximal desulfurization and denitration efficiencies were 98% and 52%, respectively. The optimum parameters were pH ˃ 5.0, 2.1 V, and 0.05 mol·dm–3 Fe(II)EDTA concentration. SO2 and NOx removal from the sintering flue gas by ammonia-Fe(II)EDTA solution scrubbing combined with electrolytic regeneration was also demonstrated in a pilot-scale reactor.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 19-36
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The laboratory comparison of shear bond strength and microscopic assessment of failure modes for a glass-ionomer cement and dentin bonding systems combined with silver nanoparticles
    Autorzy:
    Porenczuk, A.
    Firlej, P.
    Szczepańska, G.
    Kolenda, A.
    Kowalczyk-Olczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307267.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adhezja
    nanocząsteczki srebra
    cement szkło-jonomerowy
    biomateriały
    adhesion
    silver nanoparticles
    dentin bonding systems
    glass-ionomer cement
    bacterial microleakage
    Opis:
    Purpose: More than half of the cavity restorations are replaced due to bacterial microleakage. A need for disinfection agents arises. Application of silver nanoparticles (AgNPs) may be beneficial, yet their impact on the adhesives’ shear bond strength to dentin remains unknown. Methods: The aim was to assess the shear bond strength to dentin of different dental materials combined with AgNPs. Failure modes were also examined using SEM/FIB, SEM/EDS and endodontic microscopes. Results: The results showed no impact of AgNPs addition to dental materials in terms of shear bond strength to dentin. A change of the failure mode of the self-etch bonding system, Clearfil SE Bond, combined with AgNPs was observed. The new failure modes depended upon the order of application of the materials onto dentin. Conclusions: The microscopic evaluation of the samples showed the presence of AgNPs agglomerations gathered on the dentin’s surface. AgNPs connection with self-etching dentin bonding system may have a serious clinical impact.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 59-70
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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