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Tytuł:
Application of diethylenetriaminepenta pentasodium salt as an eco-friendly depressant to effectively improve the flotation separation of scheelite and calcite
Autorzy:
Zhou, Hepeng
Wu, Handan
Guo, Jiangfeng
Tang, Xuekun
Huang, Wen
Luo, Xianping
Powiązania:
https://bibliotekanauki.pl/articles/27323649.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
scheelite
calcite
diethylenetriaminepenta pentasodium salt
depressant
adsorption
Opis:
Diethylenetriaminepenta (methylene-phosphonic acid) pentasodium salt (DTPMPA), an eco-friendly reagent, was tried for the first time as a depressant for flotation separation of scheelite from calcite. Micro-flotation tests show that DTPMPA can selectively depress the floatability of calcite. In contrast, DTPMPA barely affects the flotation behavior of scheelite. Based on the selective depress effect, floatation separation of scheelite and calcite can be effectively achieved by using DTPMPA as depressant in artificially mixed minerals flotation tests. Based on a series of measurements, it found the surface of calcite was positively charged due to the existence of Ca ion site, which can be chelated with –PO3H- functional group on the surface of DTPMPA. In the flotation process, DTPMPA can be chemically absorbed on the surface of calcite to inhibit further collector adsorption. On contrast, little DTPMPA was adsorbed on the surface of scheelite due to the spatial site resistance and electrostatic repulsion induced by surface WO42+. All in all, these results exhibit DTPMPA has excellent selective depression ability on calcite, which can be potentially applied in the actual scheelite flotation process.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174718
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective flotation separation of scheelite and calcite by applying methylene phosphonic acid sodium as a novel and green depressant
Autorzy:
Zhou, Hepeng
Wu, Handan
Guo, Jiangfeng
Tang, Xuekun
Huang, Wen
Luo, Xianping
Powiązania:
https://bibliotekanauki.pl/articles/24086193.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
scheelite
calcite
inhibition mechanism
flotation separation
Opis:
It is known that the flotation separation of scheelite and calcite is quite difficult due to their similar surface properites. To slove the problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as an efficient depressant for flotation separation of calcite for the first time. In flotation experiments, it demonstrates that EDTMPS could strongly inhibit the flotation of calcite but barely affect the flotaiton behavior of scheelite, showing excellent dpress ability and selectivity. Based on a series of measurements including contact angle analysis, zeta potential, and XPS analysis, it was found that large amout of EDTMPS could be absorbed on the surface of calcite through strong chemical chelation reaction and thus inhibiting the further adsorption of NaOL. On the contrary, little EDTMPS was absorbed on that of scheelite owing to the negatively charged tungstate ions on the surface in relative terms. All in all, these results exhibit EDTMPS has excellent selective inhibition ability on calcite, which can be potentially applied in actual scheelite and calcite flotation separation process.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168517
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation study on NO oxidation by OH radical clusters in flue gas
Autorzy:
Wen, Zhengcheng
Zhang, Xiaofeng
Huang, Ju
Yang, Zhengyin
Powiązania:
https://bibliotekanauki.pl/articles/27323979.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Fenton reaction
nitric oxide
numerical simulation
reakcja Fentona
tlenek azotu
symulacja numeryczna
Opis:
Fenton reaction is an important method to remove NO from flue gas. • OH radicals generated in the Fenton reaction can effectively oxidize NO to NO2, which is absorbed and removed by alkali sorbent. To supply guidance for engineering research, numerical simulation of NO oxidation by • OH radical clusters in flue gas has been carried out using Fluent software. The average concentration of NO on the cross sections at various positions of a cylindrical pipe with a circular surface was calculated by simulation. Under various working conditions (temperature, • OH/NO molar ratio, NO concentration in flue gas, and jet velocity), NO oxidation efficiency by • OH radical was simulated and the key factors affecting NO oxidation were analyzed. The results show that temperature and • OH/NO molar ratio are the key factors affecting the oxidation of NO by • OH radicals. The injection velocity has also a significant effect on the oxidation efficiency while the moisture and oxygen content are minor factors influencing the process. The optimum oxidation efficiency of NO is obtained at 473–523 K, the molar ratio of • OH/NO ca. 1.4, the jet velocity 10 m/s, and the flue gas velocity of 3 m/s.
Źródło:
Environment Protection Engineering; 2023, 49, 3; 69--82
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overall buckling performance of high strength steel welded I-sections under combined axial compression and bending
Autorzy:
Huang, Bing
Zhang, Wen-Fu
Powiązania:
https://bibliotekanauki.pl/articles/2174009.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
połączenie belka-słup
ściskanie osiowe
zginanie
analiza elementów skończonych
stal o wysokiej wytrzymałości
wyboczenie
dwuteownik spawany
beam-column connection
axial compression
bending
finite element analysis
high strength steel
overall buckling
welded I-section
Opis:
This paper presents a numerical investigation into the high strength steel (HSS) welded I-section overall buckling performance with respect to the major axis under combined axial compression and bending. The validation of FE models compared with the existing test data to verify the appropriateness of the element division and boundary condition was firstly conducted. In line with the FE arrangement verified, separate 890 numerical models, covering a broader range of eight steel grades (460 MPa, 500 MPa, 550 MPa, 620 MPa, 690 MPa, 800 MPa, 890 MPa and 960 MPa), different overall slenderness and various eccentricities were designated. Subsequently, the comparison of the resistance prediction codified design rules in EN1993-1-1, ANSI/AISC 360-10 and GB50017-2017 was preferentially operated, by the instrumentality of the normalized axial compression-bending moment curves. The results graphically revealed that, the provision given in ANSI/AISC 360-10 concerned in the present work was the most loose, whereas, the corresponding content set out in EN1993-1-1 and GB50017-2017 was relatively on the safe side. Taking account of the FE results, the conservative shortcomings of the considered rules in EN1993-1-1 and GB50017-2017 were further highlighted. Especially, the disparity of EN1993-1-1 and numerical results was higher to 27%, from the perspective of a definition given in the present work. In contrast, the provision in ANSI/AISC 360-10 yielded a relatively accurate prediction, on average. Based on the numerical program, an alternative formula for the HSS welded I-section beam-columns with a general expression form was sought, which intimately reflected the effect of overall slenderness.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 369--384
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rolling Bearing Fault Diagnosis Method Based on Improved Variational Mode Decomposition and Information Entropy
Autorzy:
Ge, Liang
Fan, Wen
Xiao, Xiaoting
Gan, Fangji
Lai, Xin
Deng, Hongxia
Huang, Qi
Powiązania:
https://bibliotekanauki.pl/articles/38883308.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
rolling bearing
gray wolf optimization
fault diagnosis
variable mode decomposition
Opis:
Due to the complex randomness and nonlinearity of rolling bearing vibration signal, it is challenging to extract fault features effectively. By analyzing the vibration mechanism of rolling bearing, it is found that the vibration signal of local damage defects of rolling bearing has the characteristics of periodic impact and amplitude modulation. The variational mode decomposition (VMD) algorithm has a good advantage in dealing with nonlinear and nonstationary signals and decomposing a signal into different modes. However, VMD has the problem of parameter selection, which directly affects the performance of VMD processing, and causes mode aliasing. Therefore, a rolling bearing fault diagnosis method based on improved VMD is proposed. A new fitness function combining differential evolution (DE) algorithm with gray wolf optimization (GWO) algorithm is proposed to form a new hybrid optimization algorithm, named DEGWO. The simulation results show that the improved VMD method based on DEGWO can adaptively remove the noise according to the characteristics of the signal and restore the original characteristics of the vibration signal. Finally, in order to verify the advantages of the research, the information entropy is extracted from the data of 1000 samples in the bearing database of Case Western Reserve University as the feature set, which is input into support vector machine (SVM) for fault diagnosis test. The results show that the diagnostic accuracy of this method is 96.5%, which effectively improved the accuracy of rolling bearing fault diagnosis.
Źródło:
Engineering Transactions; 2022, 70, 1; 23-51
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse flotation of collophanite at natural pH using isooctyl polyoxyethylene ether phosphate as a collector
Autorzy:
Li, Hongqiang
Zhang, Wen
Chen, Qian
Huang, Peng
Kasomo, Richard M.
Zou, Ze
Weng, Xiaoqing
He, Dongsheng
Yang, Siyuan
Song, Shaoxian
Powiązania:
https://bibliotekanauki.pl/articles/1445877.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
reverse flotation
dolomite
fluorapatite
AEP
selective adsorption
Opis:
Reverse flotation of collophanite at natural pH could significantly decrease the cost of pH regulators. In this study, isooctyl polyoxyethylene ether phosphate (AEP) was tested as a new surfactant in the reverse flotation of collophanite. Micro-flotation tests were conducted, and the adsorption mechanism of the new collector was analysed using X-ray photoelectron spectroscopy (XPS) and zeta potential analyses. The results of the flotation tests demonstrated that AEP could enable dolomite to float under natural pH (pH=7.2) and showed profound selectivity towards dolomite as opposed to fluorapatite. Based on the zeta potential and XPS results, the adsorption phenomena are mainly attributed to calcium active sites on both mineral surfaces. Dolomite possesses more magnesium active sites than fluorapatite, which tend to reinforce the interaction effect between AEP and dolomite. Furthermore, when compared to CO32- ions on the dolomite surface, PO43- ions on the fluorapatite surface tend to exhibit a stronger hindrance to the adsorption of AEP on the fluorapatite surface. This is attributed to their larger volumes and more charges on their surfaces, thereby causing a floatability difference between the two minerals.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 78-86
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid watermarking scheme based on singular value decomposition ghost imaging
Autorzy:
Wu, Jun-Yun
Huang, Wei-Liang
Wen, Ru-Hong
Gong, Li-Hua
Powiązania:
https://bibliotekanauki.pl/articles/1835818.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
digital watermarking
SVD ghost imaging
discrete wavelet transform
imperceptibility
Opis:
A hybrid watermarking algorithm with an optical watermark image based on singular value decomposition (SVD) ghost imaging is designed. Simultaneously, the blended watermarking algorithm is designed based on 4-level discrete wavelet transform (DWT), discrete cosine transform (DCT) and singular value decomposition (SVD). The 4-level diagonal sub-band image is obtained by performing 4-level two-dimensional wavelet transform on the original image, and the coefficient matrix is produced by applying the discrete cosine transform on the 4-level diagonal sub-band image. Then, three matrices are obtained by performing the singular value decomposition on the coefficient matrix. In addition, the optical watermark image is encrypted by an SVD ghost imaging system. The system could generate a secret key, and unauthorized users could not decrypt and reconstruct the original watermark image without this key. Later the encrypted watermark image is generated into the other three matrices by singular value decomposition. Afterwards, the encrypted watermark is embedded in the host image by mutual operation of different matrices in the algorithm. Simulation results validate the feasibility of the proposed hybrid watermarking scheme.
Źródło:
Optica Applicata; 2020, 50, 4; 633--647
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An empirical study on the consumers’ willingness to insure online
Badanie empiryczne dotyczące wolności konsumentów do ubezpieczenia online
Autorzy:
Huang, Wen-Shin
Chang, Chia-Tse
Sia, Wei Yeng
Powiązania:
https://bibliotekanauki.pl/articles/406063.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska
Tematy:
TAM
trust
perceived risk
product involvement
pension financial
travel insurance
zaufanie
postrzegane ryzyko
zaangażowanie produktu
emerytura finansowa
ubezpieczenie podróżne
Opis:
This study used TAM as a theoretical basis to explore the public's attitude towards online insurance products. This study used the people in Taiwan as the research subject and distributed 628 questionnaires on the Internet by means of convenient sampling. After eliminating 88 invalid questionnaires, 540 valid questionnaires, the effective recovery rate was 85.99%. The findings of this study are as follows: 1. In the pension financial planning model, perceived usefulness, trust, and product involvement have a significant positive impact on attitude; perceived risk has a significant negative impact on attitude; attitude and subjective norm have a significant positive impact on behavioral intention Impact. 2. In the travel insurance model, perceived usefulness, perceived ease of use, trust and product involvement have a significant positive impact on attitudes; attitudes and subjective norms have a significant positive impact on behavioral intentions. Finally, this study concludes that insurance belongs to high amount and long-term products, it may not be suitable for people to buy through the Internet; the other hand, if insurance belongs to one-time and low-priced products that can be solved conveniently, quickly and efficiently demand is the primary consideration of the people.
W artykule przedstawiono teoretyczną podstawę do badania postaw społeczeństwa wobec internetowych produktów ubezpieczeniowych. W badaniu wykorzystano mieszkańców Tajwanu, jako przedmiot badań i rozprowadzono 628 kwestionariuszy w Internecie. Po wyeliminowaniu 88 nieprawidłowych kwestionariuszy i 540 ważnych kwestionariuszy efektywny wskaźnik odzysku wyniósł 85,99%. Wyniki tego badania są następujące: 1) W modelu planowania finansów emerytalnych postrzegana użyteczność, zaufanie i zaangażowanie produktu mają znaczący pozytywny wpływ na nastawienie; postrzegane ryzyko ma znaczący negatywny wpływ na nastawienie; postawa i subiektywna norma mają znaczący pozytywny wpływ na intencje behawioralne. 2) W modelu ubezpieczenia podróżnego postrzegana użyteczność, postrzegana łatwość użytkowania, zaufanie i zaangażowanie produktu mają znaczący pozytywny wpływ na postawy; postawy i subiektywne normy mają znaczący pozytywny wpływ na intencje behawioralne. W badaniu stwierdzono, że ubezpieczenie należy do produktów o dużej wartości i do produktów długoterminowych, może nie być odpowiednie dla osób kupujących przez Internet; z drugiej strony, jeśli ubezpieczenie należy do jednorazowych i tanich produktów, które można rozwiązać wygodnie, szybko i skutecznie, popyt jest najważniejszym czynnikiem, który ludzie biorą pod uwagę.
Źródło:
Polish Journal of Management Studies; 2019, 20, 1; 202-212
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photonic generation of broadly tunable radio-frequency signal using a reflective semiconductor optical amplifier
Autorzy:
Lu, Youxi
Wang, Fei
Gu, Jun
Shi, Lun
Peng, Mengmeng
Huang, Jingxin
Kang, Wen
Powiązania:
https://bibliotekanauki.pl/articles/173479.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
radio frequency signal generation
semiconductor optical amplifiers
four-wave mixing
Opis:
A novel scheme for photonic generation of broadly tunable radio frequency signal using a reflective semiconductor optical amplifier (RSOA) is demonstrated. A continuous wave emitted from the laser diode is modulated by a Mach–Zehnder modulator, then the modulated optical carrier is injected into the RSOA. Due to the four-wave mixing effect in the RSOA, the limited frequency components of the modulated signal are expanded, which directly lead to the generation of a wide frequency comb. Two optical tunable bandpass filters are parallelly connected to select the desired sidebands, which are launched into a photodetector or photomixer to generate radio frequency signal by beating. Using the proposed method, the bandwidth of generated radio frequency signal can range from 20 to 300 GHz.
Źródło:
Optica Applicata; 2019, 49, 1; 27-36
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarization dependence of stimulated Brillouin scattering-based switchable microwave photonic filter
Autorzy:
Gu, Jun
Wang, Fei
Lu, Youxi
Peng, Mengmeng
Shi, Lun
Kang, Wen
Huang, Jingxin
Powiązania:
https://bibliotekanauki.pl/articles/173837.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonic filter
stimulated Brillouin scattering
polarization dependence
Opis:
We propose and experimentally demonstrate a switchable microwave photonic filter based on polarization dependence of stimulated Brillouin scattering (SBS). The continuous optical wave from a tunable laser source is split into two branches. One branch serves as the SBS pump source and another branch serves as the signal source which are interactional to generate the SBS effect in the dispersion-shifted fiber. Only by adjusting the polarization direction of pump light and signal light, a frequency response switched between bandpass and notch filtering shape can be obtained.
Źródło:
Optica Applicata; 2019, 49, 1; 5-11
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconfigurable and tunable multi-tap bandpass microwave photonic filter based on a hybrid-gain-assisted multi-wavelength fiber ring laser
Autorzy:
Peng, Mengmeng
Wang, Fei
Shi, Lun
Huang, Jingxin
Kang, Wen
Powiązania:
https://bibliotekanauki.pl/articles/174908.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonic filter
multi-wavelength fiber ring laser
microwave signal processing
Opis:
A reconfigurable and tunable multi-tap bandpass microwave photonic filter based on a hybrid-gain-assisted multi-wavelength fiber ring laser (HMFRL) is proposed and experimentally demonstrated. The HMFRL containing a hybrid gain medium and a high birefringence fiber loop mirror serves as the multiple taps generator for the microwave photonic filter. In order to realize a bandpass filter, the multiple taps are phase modulated, then the modulated signal is launched into a coil of dispersion compensating fiber to introduce different time delays for each tap. As a result, a bandpass response is obtained at the output of a high speeding photodetector. By adjusting the bias of the semiconductor optical amplifier from 344 to 450 mA, the number of multiple taps can be increased without optical signal-to-noise ratio degradation. Thus, a multi-tap bandpass microwave photonic filter with bandwidth reconfiguring from 449 to 274 MHz is achieved. In addition, by changing the length of polarization maintaining fiber in the high birefringence fiber loop mirror, the wavelength spacing of the multiple taps can be adjusted, making the bandpass microwave photonic filter’s free spectral range tunable.
Źródło:
Optica Applicata; 2019, 49, 3; 499-507
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Detonation Reaction-zone and Energy Release Characteristics of a Cast HMX-based PBX
Autorzy:
Tan, Kaiyuan
Han, Yong
Luo, Guan
Yin, Ming
Wen, Shanggang
Huang, Fenglei
Powiązania:
https://bibliotekanauki.pl/articles/358217.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
cast polymer-bonded explosive
detonation reaction zone
energy release characteristics
shock overpressure
Opis:
This article gives a comprehensive study of the detonation reaction-zone (DRZ) and energy release characteristics of a cast HMX-based polymer-bonded explosive, PBX-91C, which has been demonstrated in our previous study to be an insensitive explosive. The DRZ of PBX-91C was studied by the impedance window method; the detonation reaction time, DRZ length, and detonation pressure were obtained. The cylinder test was employed to evaluate the acceleration ability of PBX-91C, the Gurney velocity and the parameters of the Jones-Wilkins-Lee (JWL) equation of state (EOS) for PBX-91C. The shock overpressure test was carried out to evaluate the energy release characteristics of PBX-91C in free-field; TNT was also tested for comparison. On the basis of the parameters of the JWL EOS determined by the cylinder test, three-dimensional numerical simulations of the shock overpressure tests were conducted. The results showed that PBX-91C is substantially more powerful than TNT; moreover, the energy release of PBX-91C is more rapid. All of these results suggest that the detonation performance of PBX-91C is close to that of RDX. PBX-91C can be a good candidate for main charges as it has both high energy and low sensitivity.
Źródło:
Central European Journal of Energetic Materials; 2019, 16, 3; 380-398
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper adsorption reaction rate and ion exchange ratio during the copper activation of sphalerite
Autorzy:
Liu, J.
Luo, D.
Huang, L.
Wang, Y.
Wen, S.
Powiązania:
https://bibliotekanauki.pl/articles/110651.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sphalerite
copper activation
solution chemistry
ion exchange ratio
reaction rate
Opis:
A theoretical analysis method of the solution chemistry characteristic of Cu(II) at various pH values was developed. Using such method, the existence form of Cu species and their proportions in aqueous solution can be clearly determined. After that, the copper adsorption and ion exchange ratio (E) during the copper activation of sphalerite were investigated. The results indicated that the copper activation of sphalerite can be divided into two stages, i.e., the fast activation stage (t ≤4 min) and slow activation stage (t >4 min). The general form of the copper adsorption rate was determined as ΓCu=K1ln(t) +Γ1, which is confirmed by the data fitting of the fast activation stage. The lower activation pH results in higher ion exchange efficiency for Cu substituting Zn. For a strong acid pH of 4.1, the E maintains about 1:1 in the entire activation time range and is not dependent on the activation time. However, the value of E is greater than 1 under weak acidic (pH=6.2) and alkaline (pH=9.1) pH conditions and it significantly depends on the activation time. For such conditions, E decreases with increase in the activation time, which supports the ion exchange mechanism, but within short activation time, it is not a 1:1 ion exchange process.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 377-385
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient sulfidization of lead oxide at high temperature using pyrite as vulcanizing reagent
Autorzy:
Zheng, Y.-X.
Lv, J.-F.
Wang, H.
Wen, S.-M.
Huang, L.
Powiązania:
https://bibliotekanauki.pl/articles/110351.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lead oxide
sulfidization roasting
pyrite
reaction mechanism
TG
Opis:
A sulfidization roasting-flotation process was usually viewed to be effective in treating the refractory oxide ore. In this paper, pyrite was proposed to be applied as a potential vulcanizing reagent to transform PbO or its surface to PbS based on feasibilities of technology and economy. The evolution process, phase and characteristics of crystal growth were investigated by TG, XRD and SEM-EDS, respectively, to interpret the interaction mechanism of lead oxide and pyrite at high temperature. It was found that the decomposition process of pyrite under argon atmosphere was a slow process of sulfur released from FeS2 to FexS, which made the process easier to be controlled. When PbO was introduced into the system, the initial solid-solid (PbO-FeS2) reaction and prevailing solid-gas (PbO-S2(g)) reaction occurred at about 500 °C and 700 °C, respectively. Combined with the SEM-EDS analyses results, the optimal temperature for the sulfidization of PbO should be in the range of 700-750 °C.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 270-277
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The surface features of activated stibnite surface with copper or lead ion
Autorzy:
Cao, Q.
Huang, Y.
Zou, H.
Wen, S.
Powiązania:
https://bibliotekanauki.pl/articles/110393.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stibnite
flotation
activation
active layer
Opis:
Cu2+ and Pb2+ are widely used as activators for the flotation of stibnite. In this work, by the treatment of Cu2+ or Pb2+, the activation product and the thickness of activation layer on the stibnite surface were both investigated. Based on the flotation results, zeta potential analysis and X-ray photoelectron spectroscopy (XPS) study, it was found that Cu2+ was reduced to Cu+ at the stibnite surface and a layer of Cu2S was formed at the surface. While, a PbS layer presenting at the stibnite surface is responsible for the activation flotation of stibnite with Pb2+. Time of flight secondary ion mass spectrometry (TOF-SIMS) analysis further implies that, when stibnite was activated with 5×10-5 mol/dm3 of CuSO4 or Pb(NO3)2, the thickness of Cu2S layer on the Cu-activated surface was close to 2.7 nm, while the thickness of PbS layer was about 1.8 nm on the Pb-activated surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 763-770
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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