Minerals Engineering最新文献

{"title":"Chlorination roasting of zinnwaldite with CaCl2 and CaCO3 for the extraction of Li, K and Rb","authors":"Eva Kristianová,&nbsp;Tomáš Tomaško,&nbsp;Nguyen Hong Vu,&nbsp;Petr Dvořák","doi":"10.1016/j.mineng.2025.109475","DOIUrl":"10.1016/j.mineng.2025.109475","url":null,"abstract":"<div><div>This study investigated alkali metal extraction from zinnwaldite using chlorination roasting with CaCl₂ and CaCO₃. It was found that increasing the ratio of CaCO₃ and zinnwaldite in the roasting mixture up to 3:1 significantly increased the efficiency of alkali metal extraction. The reactions in roasting mixture components occurred below 500 °C on the surface of zinnwaldite particles. Decomposition of zinnwaldite and CaCO₃ began around 600 °C, leading to the formation of new CaO-SiO₂-based phases. The maximal extraction of 96 % of Li, 96 % of K, and 100 % of Rb was achieved at 850 °C when the mixture of CaCO₃/zinnwaldite at the ratio of 4:1 was used with significant volatilization of alkali metal chlorides. The formation of an amorphous glass phase associated with compaction of material above 850 °C did not affect the extraction of K and Rb, but it considerably constrained the extraction of Li due to immobilization of its ions in the glassy matrix. The additional limiting factor for Li extraction was the binding of chlorine in stable phases. Adding CaCO₃ to the roasting mixture was found to prevent the release of HCl, HF or Cl₂ during roasting. Li₂CO₃ was precipitated from leachate prepared from sinters obtained under the optimal sintering conditions and subsequently recrystallized from demineralized water, achieving battery grade purity of 99.80 %.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109475"},"PeriodicalIF":4.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184668","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":"Interfacial differentiation of a high-performance collector adsorption enabling selective flotation separation of chalcopyrite from pyrite","authors":"Tao Chen,&nbsp;Runqing Liu,&nbsp;Wenchao Dong,&nbsp;Min Wei,&nbsp;Wei Sun","doi":"10.1016/j.mineng.2025.109478","DOIUrl":"10.1016/j.mineng.2025.109478","url":null,"abstract":"<div><div>This research introduces N-butyl thiophosphoric triamide (NBPT) as a novel selective collector for chalcopyrite and investigates its adsorption characteristics and mechanisms on both chalcopyrite and pyrite surfaces. The results of single and binary mixed mineral flotation tests demonstrated that at a slurry pH of 8, an effective separation between chalcopyrite and pyrite could be achieved using NBPT as the collector and methyl isobutyl carbinol (MIBC) as the frother. Additionally, the selective adsorption mechanism of NBPT on chalcopyrite was elucidated through adsorption density measurements, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. Adsorption density analysis showed that NBPT was more inclined to adsorb on the chalcopyrite surface rather than the pyrite surface. In addition, FT-IR analysis indicated that the adsorption intensity of NBPT on chalcopyrite was much higher than that on pyrite. XPS analysis and DFT calculations further indicated that chemisorption occurs between the S atoms of NBPT itself and the Cu sites on the surface of chalcopyrite, forming S-Cu coordination bonds, whereas only physisorption occurs on the surface of pyrite. This differentiated adsorption mechanism is key to the selective collection of chalcopyrite by NBPT. In conclusion, NBPT, as an environmentally friendly collector, demonstrated broad application prospects in chalcopyrite-pyrite flotation systems.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109478"},"PeriodicalIF":4.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184669","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":"Vacuum roasting to enhance the removal of muscovite from quartz by controlling the decomposition pathway","authors":"Songjiang Guo ,&nbsp;Junjie Zhao ,&nbsp;Guangying Zhang ,&nbsp;Shicong Yang ,&nbsp;Kuixian Wei ,&nbsp;Wenhui Ma","doi":"10.1016/j.mineng.2025.109472","DOIUrl":"10.1016/j.mineng.2025.109472","url":null,"abstract":"<div><div>The removal of muscovite impurities from quartz ore determines the final purity of high-grade quartz sand. To improve the removal of muscovite by leaching, this study systematically investigated the effect of atmospheric roasting and vacuum roasting on muscovite decomposition pathways through thermodynamic analysis and phase characterization. The results revealed that vacuum roasting caused the muscovite to decompose according to the reaction pathway of R6 and completely decomposed into small molecular substances, significantly lowered the Gibbs free energy change (ΔG) of reaction <span><span>(R6)</span></span>, allowing it to occur at the studied roasting temperatures. This process prevented the formation of KAlSi₂O₆ during roasting while facilitating the direct volatilization of potassium (K) and the transformation of aluminum (Al) into leachable Al₂O₃. The experimental results demonstrated that vacuum roasting significantly enhanced the leaching removal of muscovite, increasing the optimal removal ratios of Al and K to 82.7% and 98.1%, respectively, compared to 72.4% and 94.6% achieved with atmospheric roasting. This innovative vacuum roasting method provides a solution to produce high-purity quartz by removing muscovite impurities.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109472"},"PeriodicalIF":4.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178855","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":"A systematic review of cemented paste backfill technology for cleaner and efficient utilization of phosphogypsum in China","authors":"Guanzhao Jiang ,&nbsp;Liangliang Zhao ,&nbsp;Shunchuan Wu ,&nbsp;Yan Li ,&nbsp;Aixiang Wu ,&nbsp;Yanduotai He ,&nbsp;Haiyong Cheng ,&nbsp;Wei Sun ,&nbsp;Hong Li","doi":"10.1016/j.mineng.2025.109468","DOIUrl":"10.1016/j.mineng.2025.109468","url":null,"abstract":"<div><div>Utilization of phosphogypsum (PG) with cleaner and efficient approach has always been a global challenge. Cemented PG backfill (CPGB) technology uses a cleaner filling material mixed with a large amount of PG to support the surrounding rock of mine goaf, which not only can efficiently solve the environmental problems during PG stacking, but also can suppress the goaf collapse. After more than 20 years of development, China has now become most popular country in CPGB technology research. This paper provided the first systematic overview of the recent research of CPGB in China in terms of cemented PG filling materials (CPGFM), environmental impacts, case studies, and challenges and prospects. Firstly, the preparation of CPGFM was introduced around the role of PG in the CPGFM, and the influencing factors and control measures of CPGFM performance were elaborated. Then, the highly anticipated environmental impacts of CPGFM were summarized based on hazardous gases emissions, phosphate and fluoride leaching and control measures. Subsequently, three engineering cases corresponding to PG utilization methods were presented. Finally, the challenges and prospects of CPGB were discussed. The results show that the use of PG as aggregate in CPGFM is an effective way to quickly reduce the stockpiles. The risk of secondary release of fluoride in various pollutants needs to be strengthened control. The existing pollutant control methods mostly use acid-base neutralization method. This comprehensive review of CPGB in China can provide valuable reference for cleaner and efficient utilization of PG worldwide.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109468"},"PeriodicalIF":4.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184667","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":"Performance analysis of an experimental laboratory-scale eccentric roll crusher and a preliminary DEM-MBD coupled simulation method validation","authors":"Shuwei Wu ,&nbsp;Shuai Wang ,&nbsp;Xianlong Li ,&nbsp;Long Ye ,&nbsp;Peng Shi ,&nbsp;Jianbo Guo ,&nbsp;Zhengbin Liu ,&nbsp;Wei Guan ,&nbsp;Guohua Wu ,&nbsp;Qingxue Huang","doi":"10.1016/j.mineng.2025.109465","DOIUrl":"10.1016/j.mineng.2025.109465","url":null,"abstract":"<div><div>Currently, there are limited publicly available crushing test data for the eccentric roll crushers, and their performance on hard ores is unknown. During the crushing process, the roll body of the eccentric roll crusher rotates in the opposite direction under the influence of crushing forces, which aims to reduce wear on the roll surface. However, owing to the complexity of the motion relationships, the mechanical behaviour of the roll body cannot be accurately simulated by the discrete element method (DEM) alone. To address this issue, a coupled discrete element method (DEM)-multibody dynamics (MBD) simulation method considering the kinematic properties of the rolling body is proposed. A qualitative and quantitative comparison between the simulation process and experimental results reveals a maximum relative error of 16.0%, thereby validating the accuracy of the method.</div><div>Additionally, the effects of various parameters on the performance of an eccentric roll crusher were explored, and laboratory-scale crushing experiments on iron ore were conducted. The effects of the eccentric shaft speed (<em>n</em>) and closed side setting (<em>CSS</em>) on the performance metrics of the eccentric roll crusher—specifically, the productivity, power, crushing force, and particle size distribution—were systematically studied, establishing quantitative relationships among these variables. According to the results of this experiment, the productivity first increases and then decreases as the eccentric shaft speed increases, whereas it continues to increase as the <em>CSS</em> increases. The power consistently increases with increasing eccentric shaft speed but decreases as the <em>CSS</em> increases. The crushing force varies little with eccentric shaft speed, but decreases with increasing <em>CSS</em>. Moreover, the weighted average particle size decreases with the increasing in eccentric shaft speed and closed side setting. These findings have important implications for guiding the production of industrial-scale eccentric roll crushers.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109465"},"PeriodicalIF":4.9,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168721","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":"A clean method for alumina production and the coproduction of silicon-potassium compound fertilizer from middle and low grade bauxite ore","authors":"Qingdong Li,&nbsp;Guozhi Lv,&nbsp;Renyun Zhang,&nbsp;Zhihui Gu,&nbsp;Xin He,&nbsp;Bingshen Liu,&nbsp;Tingan Zhang","doi":"10.1016/j.mineng.2025.109449","DOIUrl":"10.1016/j.mineng.2025.109449","url":null,"abstract":"<div><div>The scarcity of high-quality bauxite and the increasing accumulation of red mud significantly hinder the sustainable development of the alumina industry. This study proposes a novel “calcification-potassium alkali” (CPA) method, which utilizes KOH instead of NaOH to simulate the Bayer process for dissolution. This method transforms the product from hydrated sodium silicate-aluminate (Na₂O-Al₂O₃-1.7SiO₂-nH₂O) to potassium silicate-aluminate (K₂O-Al₂O₃-SiO₂). Under optimal conditions (240 g/L K₂O, 260 ℃, calcium-silicon ratio 0.2, and 60 min reaction time), the alumina extraction rate reached 82.53 %， with a product containing 99.4 % alumina. The solid product also comprised 19.82 % SiO₂ and 11.52 % K₂O, with effective SiO₂ and K₂O accounting for 26.8 % and 88.2 %, respectively. Compared to the Bayer method, CPA markedly enhances the alumina leaching rate while ensuring that the transformation product complies with the relevant standards for silica-potash fertilizer. Furthermore, the transformed red mud can be utilized in the production of mineral silica-potassium fertilizer, addressing the issue of red mud accumulation and alleviating the supply and demand pressures for potash fertilizer. This approach not only improves economic benefits but also offers a new reference scheme for the efficient utilization and clean production of low and medium-grade bauxite.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109449"},"PeriodicalIF":4.9,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168780","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":"Application of supercritical CO2 fluid extraction technology in dealkalization and purification of high-alkali coal: Extraction process and mechanism","authors":"Junwei Guo ,&nbsp;Xianglin Li ,&nbsp;Yi Li ,&nbsp;Ziyang Yu ,&nbsp;Fan Yang ,&nbsp;Bo Zhang","doi":"10.1016/j.mineng.2025.109476","DOIUrl":"10.1016/j.mineng.2025.109476","url":null,"abstract":"<div><div>The Zhundong region in Xinjiang possesses substantial reserves of high-alkali coal, and its efficient and clean utilization is urgent. Supercritical CO₂ extraction is a promising green technology for low-rank coal upgrading. In this paper, the removal effects of alkali and alkaline earth metals and ash in high-alkali coal under different supercritical CO₂ fluid extraction system were investigated. The evolution law of the microstructural characteristics during the extraction process was analyzed. The removal mechanism of the synergistic extraction system combining supercritical CO₂ fluid and citric acid was elucidated. It is found that the removal of alkali and alkaline earth metals in supercritical CO₂ fluid-citric acid system is the best. The removal efficiency of Na, Ca, K and Mg reaches 82.23 %, 33.13 %, 63.76 % and 58.77 %, respectively, at which time the ash content is only 2.50 %. Metal cations present in the form of carboxylates and phenolates are displaced by H⁺ to form stable structures, that is, the protonation of carboxylates and phenolates, which increases the number of oxygen-containing functional groups. The methyl and methylene are extracted, and the aliphatic and aromatic compounds are decreased. The surface of coal becomes more rough and messy. The specific surface area increases, and the pore volume ratio of micropores gradually decreases, the pore volume ratio of mesopores and macropores gradually increases, and the roughness and complexity of pore surface decrease. The synergistic extraction of supercritical CO₂ fluid with additives is poised to play a pivotal role in the processing and quality upgrading of low-rank coals.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109476"},"PeriodicalIF":4.9,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168782","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":"3D-printed polyamide-H2TiO3 composite for selective lithium adsorption: Insights from experimental and theoretical dynamic simulations studies","authors":"Ekaterina Bandina ,&nbsp;Mohammed Elkabous ,&nbsp;Anna Iurchenkova ,&nbsp;Youssef El Ouardi ,&nbsp;Eveliina Repo","doi":"10.1016/j.mineng.2025.109470","DOIUrl":"10.1016/j.mineng.2025.109470","url":null,"abstract":"<div><div>Global decarbonization has increased the demand for lithium-ion batteries (LIBs), leading to a high demand for lithium a critical raw material in the EU. Efficient lithium recovery, especially from water sources, is essential due to the growing demand need for LIB recycling. Adsorption technology is effective for this purpose, but traditional powder adsorbents present operational challenges. To overcome this, 3D printing allows for the preparation of solid monolith adsorbents with improved mechanical stability and reusability. In this work, a polyamide-lithium titanium oxide composite (PA2200-Li₂TiO₃) was 3D-printed using selective laser sintering technology. The composite was characterized using SEM-EDS, TEM, XRD, Raman spectroscopy, TGA and XPS. The adsorbent exhibited up to 87 % lithium adsorption efficiency at a concentration of 20 mg/L and showed high selectivity for lithium over sodium (Li/Na ≈ 37.4) and potassium (Li/K ≈ 60.5). A mechanism involving Li⁺ ion adsorption and transport through Li₂TiO₃’s structural channels has been proposed, with dynamic simulations suggesting that lithium ions preferentially diffuse through these channels due to their geometric and energetic configuration. Thermodynamic studies confirmed an endothermic adsorption process with enhanced performance at higher temperatures. Regeneration tests demonstrated only a 7 % reduction in adsorption efficiency after three cycles, indicating structural stability and the potential for scalable application in lithium recovery processes.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109470"},"PeriodicalIF":4.9,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168781","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":"Concentration study for low-grade refractory rhodochrosite by microwave calcination followed by magnetic separation","authors":"Xuyang Yu ,&nbsp;Wentao Zhou ,&nbsp;Shuai Yuan ,&nbsp;Xiao Liu","doi":"10.1016/j.mineng.2025.109457","DOIUrl":"10.1016/j.mineng.2025.109457","url":null,"abstract":"<div><div>Owing to its own complex characteristics, large-scale resource utilization using the traditional calcination process makes it difficult to achieve efficient enrichment of rhodochrosite. In this study, the microwave calcination followed by magnetic separation was proposed as an effective method for enriching manganese ore from rhodochrosite. The phase transition and microstructural evolution of the main minerals during the calcination process were also systematically investigated. The experimental results demonstrate that magnetic fractions with a grade of 21.64%, recovery rate of 86.56% and yield of 71.20% can be obtained under the optimized conditions. The rhodochrosite phase is selectively changed to manganosite during the calcination process. The cracks between manganese minerals and gangue minerals inside the rhodochrosite, as well as the porous structure on the surface of the ore, are generated, which contributes to achieve more complete dissociation of manganese minerals in subsequent grinding, thereby facilitating separation and enrichment effects.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109457"},"PeriodicalIF":4.9,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168779","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":"Characterisation and magnetic separation of complex low grade saprolite ore for rare earth elements minerals recovery","authors":"Theophilus Amos Judge ,&nbsp;Richel Annan Dadzie ,&nbsp;William Skinner ,&nbsp;George Blankson Abaka-Wood","doi":"10.1016/j.mineng.2025.109437","DOIUrl":"10.1016/j.mineng.2025.109437","url":null,"abstract":"<div><div>In this study, mineralogical and strategic magnetic beneficiation tests were undertaken on a complex low grade saprolite ore to assess the feasibility of recovering valuable rare earth elements (REE) minerals. Mineralogical characterisation tests revealed that bastnäsite was the main REE mineral, with significant amount of La-Nd-Si/Fe intergrowths. The bulk of the ore was occupied by clay and silicate minerals including mica, quartz, K-silicates, and Na-silicates. Subsequently, magnetic separation tests were conducted on the ore using a wet high intensity magnetic separator (WHIMS), where the relative effects of applied magnetic field intensity, matrix type, feed mass, feed desliming, and concentrate regrinding on REE minerals recovery were investigated. Experimental results showed that increasing magnetic field intensity and using fine expanded metal matrix enhanced REE minerals recovery, although concentrate grade was compromised. Additionally, different magnetic separation flowsheets employing regrinding and desliming stages were tested. The highest concentrate grade of 9.12 % total rare earth oxide (TREO) was achieved when the deslimed feed was processed at 1.7 T with the WHIMS fitted with the medium expanded metal matrix mesh, where 86 % REE recovery was observed. A beneficiation process flow sheet for recovering and upgrading REE minerals in the low-grade saprolite ore has been proposed, which recovered 74 % REE assaying a concentrate grade of 9.12% TREO . It was observed that the recovery of mica, entrainment recovery of liberated and unliberated silicate minerals and the presence of bastnäsite/REE-silicates intergrowths limited the extent of TREO upgrade that could be achieved although recoveries were high. The present study provides information on the process mineralogical data of the ore, whiles establishing the technical feasibility of employing magnetic preconcentration conditions to recover valuable REE minerals and identifying other preconcentration strategies which could be utilized in subsequent studies.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109437"},"PeriodicalIF":4.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168778","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}