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    Wyświetlanie 1-15 z 15
    Tytuł:
    Studies on the performance of impact resistant structure of hydraulic support in fully mechanized mining face under rock burst
    Autorzy:
    Zhang, Qiang
    Zhang, Runxin
    Powiązania:
    https://bibliotekanauki.pl/articles/2200835.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    rock burst
    energy absorbing structures
    finite element
    mechanical properties
    Opis:
    In order to solve the support problem of a fully mechanized coal face under rock burst and with the goal of safe and efficient coal mining, the present study hasenvisaged a hexagon periodic arrangement energy absorption structure. Based on the shell theory, the mechanical model of the impact resistant structure and hydraulic support was constructed using the finite element method. The mechanical properties of the hydraulic support under a full impact and a partial load impact of the roof were analysed, and the impact resistant structure was designed to prove the reliability of the structure. The results showed that the anti-impact structure reduced the stress and stress fluctuation of the column and effectively reduced the shape variable of the weak link of the hydraulic support. Furthermore, a delay in the time was observed, when the pressure of the hydraulic cylinder reached the yield strength, and there was a gain in the time for the opening of the large flow safety valve. Especially, under the action of partial load, the column did not bend, and the hydraulic cylinder was in the elastic range. Our results can provide new insights in the support of rock burst working face, which is of great significance concerning safety in the coal mining.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 649--658
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recognition of pick wear condition based on Grey-Markov chain model
    Autorzy:
    Zhang, Qiang
    Zhang, Jiayao
    Powiązania:
    https://bibliotekanauki.pl/articles/2200890.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    pick wear
    vibration acceleration signal
    acoustic emission signal
    Grey-Markov method
    Opis:
    An attempt is made in this paper to solve the pick wear problem of mining machinery and propose a pick wear degradation model based on the Grey-Markov chain by using generated characteristics signals and certain pick wear parameters to enhance the prediction accuracy. The vibration and acoustic emission signals generated during the catting pick are extracted and analyzed. The energy and the value of the characteristic signal are obtained by wavelet analysis to construct a characteristic sample library of the signals. Two kinds of signals are applied to the model to analyze the error between the real and the predicted values. The model prediction results demonstrate a 1.43% error of the vibration signal, 1.64% error of the acoustic emission signal with 98% prediction accuracy, thus offers a new method for monitoring the pick wear of mining machinery.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 289--303
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive self-regulation PID control of course-keeping for ships
    Autorzy:
    Zhang, Qiang
    Ding, Zhongyu
    Zhang, Meijuan
    Powiązania:
    https://bibliotekanauki.pl/articles/258866.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ships
    course-keeping control
    self-regulation PID
    adaptive control
    Lyapunov
    Opis:
    To solve the nonlinear control problems of the unknown time-varying environmental disturbances and parametric uncertainties for ship course-keeping control, this paper presents an adaptive self-regulation PID (APID) scheme which can ensure the boundedness of all signals in the ship course-keeping control system by using the Lyapunov direct method. Compared with the traditional PID control scheme, the APID control scheme not only is independent of the model parameters and the unknown input, but also can regulate the gain of PID adaptively and resist time-varying disturbances well. Simulation results illustrate the effectiveness and the robustness of the proposed control scheme.
    Źródło:
    Polish Maritime Research; 2020, 1; 39-45
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Event-triggered adaptive neural network trajectory tracking control for underactuated ships under uncertain disturbance
    Autorzy:
    Su, Wenxue
    Zhang, Qiang
    Liu, Yufeng
    Powiązania:
    https://bibliotekanauki.pl/articles/34611659.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    event-triggered control
    underactuated marine surface vessels
    adaptive neural network
    trajectory tracking
    finite-time
    Opis:
    An adaptive neural network (NN) event-triggered trajectory tracking control scheme based on finite time convergence is proposed to address the problem of trajectory tracking control of underdriven surface ships. In this scheme, both NNs and minimum learning parameters (MLPS) are applied. The internal and external uncertainties are approximated by NNs. To reduce the computational complexity, MLPs are used in the proposed controller. An event-triggered technique is then incorporated into the control design to synthesise an adaptive NN-based event-triggered controller with finite-time convergence. Lyapunov theory is applied to prove that all signals are bounded in the tracking system of underactuated vessels, and to show that Zeno behavior can be avoided. The validity of this control scheme is determined based on simulation results, and comparisons with some alternative schemes are presented.
    Źródło:
    Polish Maritime Research; 2023, 3; 119-131
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Wear Resistance in Polycrystalline and Monocrystalline Iron
    Autorzy:
    Liu, Zhiming
    Zhang, Qiang
    Liu, Fangying
    Zhang, Hezhe
    Powiązania:
    https://bibliotekanauki.pl/articles/2203723.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    molecular dynamics
    polycrystalline
    centro symmetric analysis
    abrasive wear
    Opis:
    In the present research, we used molecular dynamics simulation to determine the effect of cutting parameters on micro-grain boundary structures and Burgers vector distribution in single crystal iron and polycrystalline iron materials. The result showed that the destruction of the lattice in polycrystalline iron caused by the cutting tool was restricted to the contact surface area. In addition, in the precision machining process, a higher refining grain was observed on the iron surface. During the cutting process of single crystal iron, large-scale slip occurred along the <111> crystal direction on the {110} crystal plane. And the slip presented an annular shape.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 15--20
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting
    Autorzy:
    Liu, Zhiming
    Zhang, Qiang
    Sun, Yuliang
    Liu, Junming
    Powiązania:
    https://bibliotekanauki.pl/articles/2200892.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    high-pressure water fracturing
    experimental bench
    dynamic characteristics
    Opis:
    Aiming at the problem that the cutting efficiency of a drum shearer is low when mining hard coal seams, an experimental bench of high-pressure water fracturing assisted cutting is designed. Compared with normal ones, the maximum equivalent stress of the improved experimental bench is reduced by 55.38%, and the maximum total deformation is reduced by 27.23%. According to the results of dynamic response analysis, it is concluded that the experimental bench of high-pressure water fracturing assisted cutting is stable and reliable under extreme working conditions, and meets design requirements for strength and stiffness.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 317--330
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inhibiting effect of citric acid on the floatability of serpentine activated by Cu(II) and Ni(II) ions
    Autorzy:
    Huang, Jun-wei
    Zhang, Cheng-qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/110224.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper ion
    nickel ion
    serpentine
    floatation
    activation
    inhibiting
    Opis:
    The laboratory researches about the inhibiting effect of citric acid on the flotation performance of serpentine activated by Cu2+ and Ni2+ were carried out through micro flotation tests, zeta potential measurements, collector adsorption capacity measurements and solution chemistry analysis. The flotation results showed that Cu2+ and Ni2+ could remarkably activate the flotation of serpentine when the pH value was more than 6, however, this activation could be effectively weakened by adding citric acid. Zeta potential measurement and adsorption capacity measurement indicated that the presence of citric acid could prevent the adsorption of Cu2+ and Ni2+, and therefore reduce the adsorption amount of potassium butyl xanthate on serpentine surface. Furthermore, solution chemical analysis of the flotation system showed that copper hydroxide Cu(OH)2(s) and the nickel hydroxide Ni(OH)2(s) were the main component in the pH range of 9 to 10, which adsorbed onto serpentine surface and made it activated; while the citric acid could effectively prohibit the formation of these metal hydroxide in slurry so as to inhibit the activation impact.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 4; 960-968
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of host countries' environmental regulations along the Belt and Road Initiative on China's Outward Foreign Direct Investment
    Autorzy:
    Qiu, Qiang
    Zhang, Tongxun
    Powiązania:
    https://bibliotekanauki.pl/articles/20874757.pdf
    Data publikacji:
    2020-01-19
    Wydawca:
    Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
    Tematy:
    environmental regulations
    OFDI
    One Belt One Line
    EPI Index
    Opis:
    This paper makes use of the panel data of China's direct investment in 61 countries along the ‘Belt and Road' from 2006 to 2016. Using the investment gravity model, we first carry out the total data regression, then the sample data regression based on the national income, the environmental regulation intensity and the district position. The study found that, as far as the overall sample is concerned, the national environmental regulation along the ‘Belt and Road' has a significant inhibitory effect on China's Outward Foreign Direct Investment (OFDI), and the countries along the line are grouped according to income levels. Environmental regulations vary according to the differences in national income levels: environmental regulations in high income and intermediate-high income countries have a notable negative correlation with the OFDI of China, while environmental regulations in low-and middle-income countries have no significant impact on China's OFDI. According to the intensity of environmental regulation, the countries along the ‘Belt and Road' are grouped. The empirical results show that China's OFDI was significantly inhibited by countries whose national environmental regulations are higher than the Environmental Performance Index (EPI), while China's OFDI was not affected by the countries whose national environmental regulations are lower than the EPI. According to the different regional groupings of the host country, it was found that the environmental regulations of European countries and West Asian countries significantly inhibited China's OFDI, while the environmental regulations of the Middle East and North Africa and East Asian countries had no significant impact on China's OFDI. Some other important factors affecting China's OFDI should be taken into consideration, including the scale of the economy in the investment home country, the host country's economic level, strategic resources, infrastructure, government regulation, and bilateral trade tightness. Except for the government regulation level, which has an inhibitory effect on China's OFDI, the others have a strong promoting effect. This is consistent with the conclusions drawn by Qiu Qiang [2018]. The role of natural resources is not significant, indicating that China has insufficient incentives to natural resources along the ‘Belt and Road' countries. Finally, from the perspective of the government and enterprises, policy recommendations are proposed relevant to China's OFDI along the ‘Belt and Road'. The government should actively collect the measurement data of the host country's environmental regulations, carry out investment grading according to the strength of the environmental regulations and formulate different investment strategies accordingly. Chinese companies must pay attention to technology and innovation capabilities, which is conducive to reducing the extrusion of OFDI with similar technology levels.
    Źródło:
    Journal of Management and Financial Sciences; 2019, 38; 61-83
    1899-8968
    Pojawia się w:
    Journal of Management and Financial Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spherical fuzzy power partitioned Maclaurin Symmetric Mean Operators and their application in Multiple Attribute Group Decision Making
    Autorzy:
    Zhang, Huiyuan
    Cai, Qiang
    Wei, Guiwu
    Powiązania:
    https://bibliotekanauki.pl/articles/27312003.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    spherical fuzzy sets
    partitioned Maclaurin symmetric mean operator
    power average operator
    multiple attribute group decision making
    Opis:
    Spherical fuzzy sets (SFSs) provide more free space for decision makers (DMs) to express preference information from four aspects: approval, objection, abstention and refusal. The partitioned Maclaurin symmetric mean (PMSM) operator is an effective information fusion tool, which can fully capture the interrelationships among any multiple attributes in the same block whereas attributes in different block are unrelated. Therefore, in this paper, we first extend PMSM operator to spherical fuzzy environment and develop spherical fuzzy PMSM (SFPMSM) operator as well as spherical fuzzy weighted PMSM (SFWPMSM) operator. Meanwhile, we discuss some properties and special cases of these two operators. To diminish the impact of extreme evaluation values on decision-making results, then we integrate power average (PA) operator and PMSM operator to further develop spherical fuzzy power PMSM (SFPPMSM) operator and spherical fuzzy weighted power PMSM (SFWPPMSM) operator and also investigate their desirable properties. Subsequently, a new multiple attribute group decision making (MAGDM) method is established based on SFWPPMSM operator under spherical fuzzy environment. Finally, two numerical examples are used to illustrate the proposed method, and comparative analysis with the existing methods to further testy the validity and superiority of the proposed method.
    Źródło:
    Archives of Control Sciences; 2023, 33, 1; 179--238
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of combined gap in whole process of transmission lines’ live working based on 3D laser point cloud
    Autorzy:
    Wang, Ying
    Zhang, Haitao
    Lv, Qiang
    Gao, Qiang
    Yi, Mingxing
    Powiązania:
    https://bibliotekanauki.pl/articles/27309938.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    3D model
    combined gap
    laser point cloud
    live working
    transmission lines
    Opis:
    Transmission lines’ live working is one of an effective means to ensure the reliable operation of transmission lines. In order to solve the unsafe problems existing in the implementation of traditional live working, the paper uses ground-based lidar to collect point cloud data. A tile based on the pyramid data structure is proposed to complete the storage and calling of point cloud data. The improved bidirectional filtering algorithm is used to distinguish surface features quickly and obtain a 3D model of the site. Considering the characteristics of live working, the speed of data reading and querying, the nearest point search algorithm based on octree is used to acquire a real- time calculation of the safe distance of each point in the planned path, and the safety of the operation mode is obtained by comparing with the value specified in the regulation, and assist in making decisions of the operation plan. In the paper, the simulation of the actual working condition is carried out by taking the “the electric lifting device ascending” as an example. The experimental results show that the established three-dimensional model can meet the whole process control of the operation, and has achieved practical effect.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 3; 737--753
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study and numerical simulation of the water entry of a ship-like symmetry section with an obvious bulbous bow
    Autorzy:
    Wang, Qiang
    Yu, Pengyao
    Zhang, Boran
    Li, Guangzhao
    Powiązania:
    https://bibliotekanauki.pl/articles/1955603.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    water entry
    bow-flare sections
    slamming
    Computational Fluid Dynamics
    Opis:
    A bulbous bow is a typical ship structure. Due to the influence of the bulbous bow, complex flow separation and gas capture phenomena may appear during the water entry of ship-like sections. In this paper, experimental and numerical studies on the water entry of a ship-like section with an obvious bulbous bow are carried out. Two thin plates are installed at both ends of the test model to ensure that the flow field during the impact process is approximately twodimensional. The free-fall drop test is carried out in the test rig equipped with guide rails. By changing drop heights, impact pressure on the model surface with different initial impact velocities is measured. A numerical model for simulating the water entry of the ship-like section is established by using the Computational Fluid Dynamics (CFD) method, based on the Navier-Stokes equations. Reasonable time steps and mesh size are determined by convergence analysis. Four different flow models are used in the numerical analysis. It is found that the K-Epsilon turbulence model can present the most reasonable numerical prediction by comparing numerical results with the experimental data. Furthermore, the influence of the bulbous bow on the impact loads is numerically studied by using the validated numerical model. It suggests that the bulbous bow has little effect on the impact force acting on the bow-flared area but, in the position near the bulbous bow, the pressure will be affected by the second slamming and the air cushion.
    Źródło:
    Polish Maritime Research; 2021, 3; 16-34
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of grouting pressure volatility on additional response of adjacent pile foundation in shield construction
    Autorzy:
    Zhang, Chuan-Chuan
    Li, Dan-Mei
    Zhang, Jun
    Yu, Tong-Sheng
    Chen, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/2086958.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    grouting pressure fluctuations
    adjacent loaded-pile foundation
    normal distribution
    FLAC3D
    Opis:
    Soil parameters along the heading direction are subjected to spatial variability during shield construction, so grouting pressure requires constant adjustment to ensure ground stress sta- bility. This causes grouting pressure to fluctuate around the design pressure/curve. There- fore, the influence of the grouting pressure volatility on the adjacent loaded-pile foundation should be considered in shield tunneling. In this study, a refined numerical simulation of the shield construction process is conducted using the Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) software. A total of 300 groups of grouting pressure pa- rameters with a skewed normal distribution are input into the numerical model. Then, the influence of the construction parameter uncertainty on the adjacent loaded-pile foundation is analyzed. Finally, the back analysis method is conducted based on the monitored data to evaluate how the construction process affects the pile foundation. The calculation results are compared with those of the traditional finite element method. The results indicate that in the tunneling process, the grouting pressure fluctuation greatly affects the additional bend- ing moment of the adjacent pile foundation. Under the influence of the grouting pressure, the additional axial force and additional bending moment of the pile foundation also follow the skewed normal distribution. The back analysis results of the pile foundation are greater than those of the typical numerical method by about 60% 100%, that is using the back analysis calculation results to evaluate the pile foundation additional response can reduce the risk.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 33--47
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the behavior of streamwise vortices formed between leading edge tubercles in a compressor cascade
    Autorzy:
    Zheng, Tan
    Qiang, Xiao-Qing
    Teng, Jin-Fang
    Feng, Jin-Zhang
    Powiązania:
    https://bibliotekanauki.pl/articles/281149.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    compressor cascade
    flow separation
    leading edge tubercles
    streamwise vortices
    formation mechanism
    Opis:
    A study has been carried out to investigate the formation mechanism and development of streamwise vortices induced by leading edge tubercles in a high speed compressor cascade. The preliminary assessment of the cascade performance in terms of the total pressure loss coefficient shows that the loss reduction is achieved at high incidence angles. A smaller wavelength leads to higher additional losses at the design point, but gives rise to a greater loss reduction at high incidence angles. The modified cascade with a tubercle wavelength of 4% chord achieves the maximum loss reduction of 36.1% at i = 10◦ , as well as the stall angle improvement of 27.6%. The formation mechanism of streamwise vortices is elaborated on the basis of the streamwise vorticity equation, in which the streamwise turning terms may be responsible for the generation of streamwise vortices. Slices of streamwise vorticity at various streamwise locations, combined with vorticity strength distributions, have been presented to study the development of streamwise vortices. The counter-rotating vortices are divided into the crest-induced streamwise vortices (CSVs) and trough-induced streamwise vortices (TSVs). A streamwise vortex pair formed from a part of the CSV sheets behind troughs, is gradually entrained by the TSV pair along the streamwise direction. In addition, the tubercles with a smaller wavelength result in higher streamwise vorticity strength with which the streamwise vortices interact with the flow separation more sufficiently and delay the separation to a greater extent.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 617-629
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and validation of a single-jack variable Mach number nozzle in a cryogenic transonic wind tunnel
    Autorzy:
    Yu, Chengguo
    Zhang, Zhili
    Wang, Ning
    Nie, Xutao
    Peng, Qiang
    Chen, Zhenhua
    Powiązania:
    https://bibliotekanauki.pl/articles/2200829.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    cryogenic
    flow uniformity
    single-jack nozzle
    transonic wind tunnel
    variable
    Mach number
    Opis:
    The wind tunnel with variable Mach numbers controlled by a single jack is highly desired in the aerospace, automobile and building industry due to its superior controllability and working range. Decreasing the temperature of a test gas is an efficient and economical approach to achieving higher Reynolds numbers that accommodate all working statuses of test subjects, which however, brings new challenges to the wind tunnel design nowadays. This paper proposes a new design concept of a single-jack variable Mach number nozzle based on its particular cryogenic characteristics, as the nozzle is the core structure to achieve variable Mach numbers. The contours of the nozzle under different Reynolds numbers and Mach numbers are modeled and solved by an incomplete elliptic integral, followed by modification with cryogenic characteristics. A 0.3-m cryogenic wind tunnel is utilized as a validation platform for the nozzle design, resulting in designed contours being in line with the measured contours. Moreover, the root means square (RMS) deviations of Mach number 1.3 at the core position are controlled within 0.011 in low and high temperatures, which surpasses the other existing wind tunnels.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 719--732
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Separation and purification of light rare earth elements from chloride media using P204 and Cyanex272 in sulfonated kerosene under non-saponification conditions
    Autorzy:
    Fan, Peiqiang
    Zhang, Wenjie
    Tong, Xiong
    Xie, Xian
    Xie, Ruiqi
    Song, Qiang
    Du, Yunpeng
    Cao, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/27323661.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    P 204
    Cyanex 272
    light rare earths
    extraction
    mechanism
    Opis:
    The extraction of light rare earths (Pr and Nd) from chloride medium was investigated using a mixture of di(2-ethylhexyl) phosphoric acid (P204) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex272) in sulfonated kerosene. The P204+Cyanex272 system exerted a synergistic effect on the separation of light rare earths, and the separation coefficient was higher than when P204 and Cyanex272 were used as extractants alone. The separation coefficient of Pr and Nd in the extraction system reached 1.75 when the pH of the aqueous phase material solution was approximately 2.5, and 1.5 mol/L hydrochloric acid as a stripping agent effectively eluted the rare earth ions in the loaded organic phase. Combining the slope method, infrared spectroscopy, and nuclear magnetic resonance spectroscopy, we explored the mechanism of the extracted Nd and Pr into the organic phase complex, and finally entered the organic phase with Re(HA2)2B. The P-O-H bond and P=O bond in the extractant P204 and Cyanex272 formed a coordination bond with Re3+. Therefore, this extraction method also provides a reference for a more environmentally friendly and efficient procedure for separation and purification of light rare earth elements Pr and Nd.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 172444
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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