Minerals Engineering最新文献

{"title":"Mixed thiol collector system in the flotation of copper ore using the REFLUX Flotation Cell (RFC)","authors":"","doi":"10.1016/j.mineng.2024.108843","DOIUrl":"10.1016/j.mineng.2024.108843","url":null,"abstract":"<div><p>Collectors play a critical role in the flotation process as they help bubbles to selectively adsorb onto the surface of target mineral particles. The selection of proper collectors and/or their blends is crucial in optimizing the flotation process for specific ores. The existing literature suggests that the use of a combination of different collector types generally results in an improved flotation performance compared to the use of a single collector type. Thus, this paper, for the first time, investigates the influence of commercial thiol collectors NAX (Minova-Ksante Sp. z o.o), AEROPHINE® 3422 (Solvay S.A.), and Aero® MX-5149 (Solvay S.A.), in varying dosages and combinations (blends), on the flotation performance of Kupferschiefer copper ore in the REFLUX Flotation Cell (RFC). This study aims to explore the impact of collectors on copper and silver flotation using new RFC technology and to replace xanthate with an eco-friendly alternative. A scanning electron microscope (SEM)-based automated mineralogy (AM) was applied for selected flotation tests to track minerals affected by collectors and their blends. The findings show that the increase in the type of collector within the blend improves the flotation performance (i.e., recovery, kinetics, and selectivity). Comparing collector mixtures, AEROPHINE® 3422, a blend of isopropyl ethyl thionocarbamate (IPETC) and dithiophosphinate (DTPi), outperformed the NAX (a blend of sodium isobutyl xanthate (SIBX) and sodium ethyl xanthate (SEX) mixture) in both copper and silver flotation.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0892687524002723/pdfft?md5=38118102e16840e67ae28b7c541850af&pid=1-s2.0-S0892687524002723-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141904778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of degradation of potassium ethyl xanthate using Fe2O3/TiO2/Flyash nanophotocatalyst using Taguchi statistical approach","authors":"","doi":"10.1016/j.mineng.2024.108865","DOIUrl":"10.1016/j.mineng.2024.108865","url":null,"abstract":"<div><p>Xanthate from mineral processing wastewater is a major threat to the ecosystem. Photocatalysis is emerging as the most effective process with the invention of new nanophotocatalytic materials. The present research focuses on developing the ternary nanocomposite Fe₂O₃/TiO₂/Flyash by a facile hydrothermal method combined with a water bath precipitation method for the efficient degradation of potassium ethyl xanthate (KEX). Taguchi’s experimentation (L₁₆) orthogonal array is used for the optimization of process parameters to get maximum KEX degradation efficiency. The optimized parameters are found to be calcination temperature 400 ^OC, photocatalyst dosage 0.7 g/L, pH 5, pollutant concentration 10 mg/L, and light intensity 100 W. The percentage contribution of each parameter is obtained through the ANOVA statistical approach as calcination temperature &gt; pH&gt;pollutant concentration &gt; photocatalyst dosage &gt; light intensity. The adsorption mechanism follows the Freundlich isotherm and fits well with pseudo-first-order and second-order kinetics. Material characterization is also done to analyze the crystal structure and morphology of the newly developed nanocomposite to gain a better understanding of the mechanism. This study indicates that the newly developed nanocomposite photocatalyst can effectively degrade potassium ethyl xanthate under light irradiation for 60 min.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetics analysis of copper extraction from copper smelting slag by sulfuric acid oxidation leaching","authors":"","doi":"10.1016/j.mineng.2024.108886","DOIUrl":"10.1016/j.mineng.2024.108886","url":null,"abstract":"<div><p>Copper smelting slag (CSS) is generally produced from the pyrometallurgy of copper sulfide concentrate, the current storage disposal methods of CSS not only occupy precious land and pollute the environment, but also waste resources. To recover copper from the CSS and explore the atmospheric pressure oxidative leaching kinetics of copper extraction from CSS with sulfuric acid was investigated intensively. In this study, the effect of particle size, sulfuric acid concentration, temperature, liquid-to-solid ratio, and hydrogen peroxide added amount were investigated comprehensively. The results indicated that the decrease of particle size and increase of other parameters can significantly promote the leaching of copper. Under the optimum conditions, 90.7 % of the copper in the CSS was effectively leached, other copper in the leaching slag mainly existed in the form of fine-grained embedded copper sulfide. The dominant phase of the leaching slag is magnetite, which could be further recovered by conventional magnetic separation. Moreover, the kinetics of copper atmospheric pressure oxidative leaching in CSS were further expounded. The results indicated that the copper leaching kinetic conforms to the shrinking core model, and the overall leaching reaction was controlled by the internal diffusion control with an activation energy of 11.22 KJ/mol. The apparent reaction order of sulfuric acid and particle size are determined to be 0.965 and 0.478 respectively. Finally, the kinetics model equation is established for copper at normal pressure as:<span><math><mrow><mn>1</mn><mo>-</mo><mfrac><mn>2</mn><mn>3</mn></mfrac><mi>η</mi><mo>-</mo><msup><mrow><mfenced><mrow><mn>1</mn><mo>-</mo><mi>η</mi></mrow></mfenced></mrow><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msup><mo>=</mo><mn>0.032</mn><mi>Â</mi><mi>·</mi><msubsup><mi>C</mi><mrow><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></mrow><mrow><mn>0.965</mn></mrow></msubsup><mi>Â</mi><mi>·</mi><msubsup><mi>r</mi><mrow><mn>0</mn></mrow><mrow><mo>-</mo><mn>0.956</mn></mrow></msubsup><mi>Â</mi><mi>·</mi><mi>t</mi></mrow></math></span>. This research could provide an alternative solution for the efficient utilization of CSS.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decoupling the effect of hydraulic oil contamination on the flotation performance of UG2 PGE ore and its interaction with alteration minerals","authors":"","doi":"10.1016/j.mineng.2024.108881","DOIUrl":"10.1016/j.mineng.2024.108881","url":null,"abstract":"<div><p>Oil contamination inadvertently arising from underground mechanised South African platinum mines is known to compromise the subsequent flotation performance. Anecdotal observations suggest that this is further exacerbated in the presence of phyllosilicate alteration minerals. Two ores of varying degrees of alteration from the Bushveld Igneous Complex were utilized in this study to investigate the effects of oil on UG2 platinum group element (PGE) ore flotation and investigate the interaction mechanisms between the oil and phyllosilicate alteration minerals. Mineralogical characterization of the ores indicated a higher percentage of the alteration phyllosilicate minerals in the altered ore (9.2 wt%) in comparison to the normal ore (5.6 wt%); with talc predominating in both ores. Baseline batch flotation test work indicated a reduction of grade with hydraulic oil addition in the normal ore (Pt by 4.5 g/t and Pd by 3.6 g/t), whereas valuable metal grades in the altered ore showed no change. In contrast to the grades, the Pt and Pd recovery dropped by 6 % and 12 %, respectively, in the altered ore floats whereas nearly constant recoveries were obtained for the normal ore as oil concentration increased. The dynamic froth stability and slurry viscosity both increased in the presence of oil and were greater in the altered ore compared to the normal ore. The observed flotation performance of the normal ore was attributed to the increasing froth stability which promoted the recovery of gangue minerals and consequent grade decrease. For the altered ore, the greater increase in the slurry pulp viscosity with oil addition was proposed to lead to poor gas dispersion and reduced interaction between bubbles and particles resulting in the reduction of recovery. The addition of sodium metasilicate successfully mitigated these effects causing a decrease in the viscosity, improvement in particle dispersion and better froth drainage. This study highlighted the potentially harmful effects of oil spillages from mechanised mining and its complex interaction with alteration minerals contained within the ore.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0892687524003108/pdfft?md5=316662c67871d2fb0cda3d2656c38d06&pid=1-s2.0-S0892687524003108-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinematic mechanics study of silicon wafers and glass particles oscillatory separation based on friction coefficient differences","authors":"","doi":"10.1016/j.mineng.2024.108876","DOIUrl":"10.1016/j.mineng.2024.108876","url":null,"abstract":"<div><p>In this paper, the static friction coefficient of different particle sizes silicon wafers, glass particles and separation platform are measured by the plane method. Based on the force analysis of particle oscillatory separation process, the kinetic equation of particle oscillatory separation process is established, and the influence of factors such as particle size and friction coefficient on the motion trajectory of particle oscillatory separation process is analyzed. The research results indicate that the range of static friction coefficients between silicon wafers, glass particles, and separation platforms is different, but there are also overlapping parts. The kinetic equation indicates that the motion speed of particle oscillatory separation process is affected by factors such as the friction coefficient between particles and separation platforms, the inclination angle of separation platforms, and the amplitude of separation platforms. During the oscillatory separation process of silicon wafer glass mixed particles, silicon wafer particles with friction coefficients of 0.33–0.39 will become silicon wafer products, glass particles with friction coefficients of 0.22–0.31 will become glass products, and silicon wafer glass particles with overlapping friction coefficients of 0.310.33 will become intermediate products. To achieve better separation of silicon wafer and glass particles in the oscillatory separation process, it is necessary to take control measures to reduce the friction coefficient between the separation platform and silicon wafer and glass particles as much as possible.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The floatability dependence of monazite, xenotime, and zircon on pH and temperature using ionic liquids as collectors","authors":"","doi":"10.1016/j.mineng.2024.108849","DOIUrl":"10.1016/j.mineng.2024.108849","url":null,"abstract":"<div><p>Ionic liquids (ILs) have recently been reported as promising collectors for rare earth minerals (REMs), but how they improve REM floatability is still not well understood. In this study, six types of acid-base ILs—tetraethyl-, tetrabutyl-, tetraoctyl-ammonium mono-(2-ethylhexyl) 2-ethylhexyl phosphonate and tetraethyl-, tetrabutyl-, tetraoctyl-ammonium di(2-ethylhexyl) phosphate—were investigated to understand how the cationic and anionic moieties of these compounds as well as the conditioning temperature influence REMs (i.e., monazite and xenotime) and zircon floatabilities. Flotation experiments were conducted at pH 5, 7, and 9 under both ambient conditions and 60 °C to assess the performance of the ILs. Zeta potential measurements coupled with Fourier transform infrared spectroscopy (FTIR) characterization of minerals were also done to identify the adsorption mechanism of ILs on mineral surfaces. The results showed that tetraoctyl-ammonium di(2-ethylhexyl) phosphate effectively separated monazite from xenotime and zircon via reverse flotation, particularly at pH 9, with conditioning at 60 °C. These findings suggest that the structural characteristics of ILs and their interactions with mineral surfaces, influenced by pH and temperature, play a significant role in enhancing the floatability of REMs. Furthermore, the study demonstrated that using ILs as collectors combined with elevated temperatures during the conditioning stage significantly enhances selectivity. This suggests the potential for effectively separating monazite from xenotime by froth flotation using ILs as collectors without the need for depressants. This innovative method could greatly benefit the REM processing field, particularly in flotation technology.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of surface physicochemical properties of spodumene and feldspar using different grinding media: Implications for flotation separation","authors":"","doi":"10.1016/j.mineng.2024.108878","DOIUrl":"10.1016/j.mineng.2024.108878","url":null,"abstract":"<div><p>Grinding processing after crushing is a common practice in mineral processing circuits involving flotation, and achieving selective liberation of target minerals by grinding is a prerequisite for successful flotation. In this study, the surface characteristics and the floatability of spodumene and feldspar particles produced by laboratory ball and short cylinder mills were determined by XRD, SEM, AFM, XPS analysis, DFT calculation, and flotation experiment. Compared with ball-milled particles, spodumene ground with short cylinder media had more exposed {1<!--> <!-->1<!--> <!-->0} cleavage planes, while feldspar under the same condition had more exposed {1<!--> <!-->1<!--> <!-->0} and {2<!--> <!-->0<!--> <!-->1} cleavage planes. Additionally, the amount of Al sites and the roughness of spodumene and feldspar after grinding by short cylinder media were higher than those of ball-milled particles. Micro-flotation experiments and XPS analysis further indicated that, although the co-adsorption of NaOL/DDA on the surface of spodumene is stronger than feldspar under both milling media, the flotation separation efficiency of spodumene and feldspar remained higher with short cylinder grinding media. Therefore, this study is expected to provide more reference value and theoretical guidance for the development of selective flotation separation of spodumene and feldspar from the perspective of grinding.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient removal of heavy metals from aqueous solutions using ion flotation technique","authors":"","doi":"10.1016/j.mineng.2024.108857","DOIUrl":"10.1016/j.mineng.2024.108857","url":null,"abstract":"<div><p>In this study, the removal of cadmium, copper, and chromium via ion flotation technique from aqueous solutions was investigated with the addition of Sodium Dodecyl Sulfate (SDS) as a collector. The critical micelle concentration of SDS was initially determined. Ion flotation tests were conducted on both mono-metal solutions, each containing a single metal, and a multi-metal solution with a mixture of the three metals. The results demonstrated a more effective recovery in mono-metal solutions, achieving over 95 % removal for cadmium, 93 % for copper, and only 55 % for chromium. In contrast, the multi-metal solution showed reduced efficiency, with 80 % removal for cadmium, 78 % for copper, and 40 % for chromium. To better understand the interactions involved, Isothermal Titration Calorimetry measurements on the Metal-SDS complexes were performed, highlighting the lower removal rate of chromium. Additionally, SEM/EDS analyses were conducted to further elucidate these interactions. Furthermore, an NMR study focusing on the ¹¹³Cd isotope was carried out, potentially for the first time, to provide additional insights into the molecular dynamics associated with the ion flotation process. Therefore, SDS stands out as an effective agent for the removal of copper and cadmium from aqueous solutions, but it may not be the ideal choice for chromium abatement.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0892687524002863/pdfft?md5=24b9cc99eb608be1bf1427a219ee49b5&pid=1-s2.0-S0892687524002863-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of a vertical roller mill using DEM-MBD coupling method","authors":"","doi":"10.1016/j.mineng.2024.108871","DOIUrl":"10.1016/j.mineng.2024.108871","url":null,"abstract":"<div><p>Vertical roller mill (VRM) that involves the complicated motion of particles and mechanical components is a high-efficiency grinding equipment and has been commonly used to grind particle materials in industry. However, the previous researches for VRM are rather few and have some limitations. Consequently, a numerical simulation method of Discrete Element Method (DEM) coupled with Multi-Body Dynamics (MBD) is proposed in this work to study Kisen Vertical Mill (KVM), an external circulation vertical roller mill developed by Sinoma International Intelligent Technology Co., Ltd., for a deeper understanding of grinding process in the VRM, in which DEM is used to simulate the particle movement and the motion of mechanical components in KVM is predicted by MBD. The particle breakage is ignored in this work due to the inapplicability of the breakage model. This coupling method is first quantitatively validated against the results measured from the actual production. Subsequently, the relatively comprehensive DEM-MBD investigations for the influences of operational conditions (including the rotation speed of table, the height and the position of retaining ring) on the performance of KVM (<em>e.g.</em>, the particle bed, the fluctuation of rollers, the grinding effect and the wear) are carried out. According to the simulation results, the particle flow behaviors would be significantly affected by these operational conditions.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of flotation process efficiency in producing DR concentrate from a low-grade iron ore","authors":"","doi":"10.1016/j.mineng.2024.108838","DOIUrl":"10.1016/j.mineng.2024.108838","url":null,"abstract":"<div><p>The steel industry holds a pivotal position in modern society, widely acknowledged as the most significant basic industry globally. Nonetheless, its substantial energy consumption and carbon emissions present significant challenges, contributing notably to global warming and climate change. Consequently, the sector has been fervently pursuing greener steelmaking processes. Among the various options, hydrogen direct reduction technology stands out as the most promising. Thus, the quest for new sources of high-quality iron ore concentrates has intensified in recent years, aimed at supplying the necessary raw material for direct reduction processes. In this context, the Mont Reed iron deposit, located in Quebec, Canada, emerges as a promising asset. The deposit comprises both magnetite and hematite-rich ores, presenting an average iron grade of 30 % along with complex gangue minerals. The present study evaluates the implementation of a flotation process to enhance the quality of the concentrate generated through low-intensity magnetic separation in the Mont Reed flowsheet, targeting direct reduction (DR) levels. The research involved the assessment of various industrial reagents to concentrate the magnetite present in the ore, as well as the execution of a design of experiments conducted using the most effective combination of reagents and different parameters. Ether amine, ether diamine, amidoamine, and phosphoric ester were evaluated as collectors, while starch, dextrin, CMC, and humic acid were assessed as depressants. Bench-scale flotation experiments presented promising results, demonstrating the feasibility of reducing the silica grade of the concentrate by 75 % (from 6.90 % SiO₂ to 1.68 % SiO₂), while producing a high-grade product containing 70.04 % Fe. The addition of a desliming stage was mandatory to achieve these results, and a Design of Experiment (DoE) campaign determined optimal flotation conditions: 150 g t⁻¹ of collector, 400 g t⁻¹ of depressant, pH 10, and 30 wt.% solids in pulp, achieving the target concentrate quality with a yield of 23.9 % and an Fe recovery of 52.0 %. These findings enhance the value of the Mont Reed deposit, positioning it as a potential source of DR pellet feed for the global iron ore market. The study also offers insights for similar operations, highlighting flotation as a viable solution when magnetic separation alone cannot achieve the necessary silica levels for DR products.</p></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141862396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}