Minerals Engineering最新文献

{"title":"Zeolite fixed-bed system enhanced with recirculation for improved copper ion removal from wastewater: Kinetic models and comparison with batch system","authors":"Sonja Milićević ,&nbsp;Sanja Martinović ,&nbsp;Dejan Todorović ,&nbsp;Vladan Milošević","doi":"10.1016/j.mineng.2025.109441","DOIUrl":"10.1016/j.mineng.2025.109441","url":null,"abstract":"<div><div>This research investigates the feasibility of a novel approach involving a fixed-bed column system with recirculation for copper ion removal from wastewater. Adsorption kinetics of zeolites were examined using a well-established batch system and compared to a fixed-bed column recirculation system, a configuration for which only limited investigations exist. Zeolite was chosen as the adsorbent due to its efficiency, affordability, availability, and eco-friendliness. The recirculation system was designed for comparative analysis with the batch system, assessing adsorption kinetics, reaction rate constants, and orders under various initial copper concentrations (100, 300, and 500 mg dm⁻³). Zeolite particles (2–3 mm) were used in the recirculation system, while finer particles (63 µm) were employed in the batch system. Experimental conditions, such as adsorbent dosage and initial pH, were kept constant to ensure the comparability of the two systems. Copper concentrations in the filtrate were measured using an atomic absorption spectrophotometer (AAS). Three experimental kinetic models were developed to describe the adsorption processes. The results indicate that the adsorption processes correlate best with Ho’s pseudo-second-order (PSO) kinetic model. Results revealed superior removal efficiency (9.77 mg g⁻¹) with the recirculation system using coarser particles compared to the batch system (7.82 mg g⁻¹) with finer particles, highlighting enhanced adsorption driving forces in the recirculation configuration. The fixed-bed column system with recirculation demonstrates superior efficiency over batch systems and reduced processing time compared to conventional fixed-bed configurations.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109441"},"PeriodicalIF":4.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116801","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":"Separation mechanism of a pneumatic dry low-intensity drum magnetic separator and optimization of magnetic fields","authors":"Dongdong Tang ,&nbsp;Yongfeng Yan ,&nbsp;Xiaosong Tian ,&nbsp;Huixin Dai ,&nbsp;Liwei Wu ,&nbsp;Feiwang Wang","doi":"10.1016/j.mineng.2025.109451","DOIUrl":"10.1016/j.mineng.2025.109451","url":null,"abstract":"<div><div>Composite force field magnetic separators, which combine a high-velocity air stream with a magnetic field, are a potential type of equipment for processing iron ore in arid and cold regions. In a previous study, we developed a pneumatic dry low-intensity drum magnetic separator (PDLDMS) and investigated its performance in the recovery of fine-grained magnetite. In this study, we extended the study of this PDLDMS by employing a validated multi-physical field coupling model to investigate the separation efficiency of mineral particles on each magnetic pole, and we optimized the magnetic field strengths within each area. The simulation results indicated that a large number of coarse-grained low-grade particles and fine-grained high-grade particles were captured in the same area (A5, A6, A7, and A8) on the surface of the separation drum, displaying equal recoverability. The coarse-grained low-grade particles in areas A5, A6, and A7 were preferentially captured in the more anterior position on the surface of the drum compared with the fine-grained high-grade mineral particles in areas A6, A7, and A8. When the drum rotated, a layered wrapping of coarse-grained low-grade intergrowth particles was formed. The equal recoverability and layered wrapping were the main reasons for the low grade of the concentrate and the difficulty of improving the separation efficiency. When the remanent magnetism values of magnetic poles N1, S1, N2, S2, N3, S3, N4, and S4 were 0.3, 0.3, 0.5, 0.3, 0.3, 0.2, 0.3, and 0.5 T, respectively, it was possible to reduce the recovery of low-grade intergrowth particles while ensuring the recovery of high-grade mineral particles. The experimental results revealed that after optimizing the magnetic field strengths, the grade of the concentrate in the area corresponding to each magnetic pole was significantly higher than that before optimization. The total concentrate grade was 61.74 %, which was 3.12 % higher than that before optimization of the magnetic field. However, the recovery only decreased by 3.14 %.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109451"},"PeriodicalIF":4.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116803","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":"Investigating the selective extraction of metals from nickel sulfide tailings using salt roasting and acid leaching","authors":"Emmanuel Atta Mends,&nbsp;Sabinus Essel Arthur,&nbsp;Shokrullah Hussaini,&nbsp;John Samuel Thella,&nbsp;Pengbo Chu","doi":"10.1016/j.mineng.2025.109433","DOIUrl":"10.1016/j.mineng.2025.109433","url":null,"abstract":"<div><div>The recovery of nickel and copper from nickel sulfide flotation tailings was studied by magnesium carbonate salt roasting followed by sulfuric acid leaching. Leaching was performed under atmospheric conditions using a gyratory water bath. The tailings material was roasted with and without magnesium carbonate at varying mass ratio (0.15 to 0.75), temperature (300 – 700 °C), and time (1 – 5 h). Subsequent leaching tests were performed using sulfuric acid at different concentrations (1 – 5 M). The influence of leaching time and temperature was investigated as well. The results after inductively coupled plasma optical emission spectroscopy analysis demonstrated that, under the optimum roasting and leaching conditions, about 98 % nickel was leached into solution while only approximately 38 % iron was present. Relatively high concentrations of other valuable metals such as copper, manganese and cobalt were also extracted into the leach solution. The salt roasting-acid leaching process consequently presents a feasible approach for selective recovery of valuable minerals from the sulfide tailings, thereby reducing downstream and purification costs.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"231 ","pages":"Article 109433"},"PeriodicalIF":4.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116802","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":"Recent advances in tailings waste as geopolymers for construction: Current challenges and prospects","authors":"Zheyuan Feng ,&nbsp;Zhibo Zhang ,&nbsp;Weixin Li ,&nbsp;Guodong Hao ,&nbsp;Xiaoning Xia ,&nbsp;Pengwei Li ,&nbsp;Kai Zhu","doi":"10.1016/j.mineng.2025.109439","DOIUrl":"10.1016/j.mineng.2025.109439","url":null,"abstract":"<div><div>This review article explores the utilization of mine tailings waste in the production of geopolymer construction materials, focusing on their potential to contribute to environmentally sustainable building practices. Geopolymers, derived from aluminosilicate-rich mine tailings, offer a promising alternative to traditional building materials by mitigating environmental pollution and lowering production costs. The paper examines how optimizing synthesis conditions enhances the mechanical properties and durability of geopolymers. Furthermore, it highlights the environmental benefits, particularly the stabilization of heavy metal ions within the geopolymer matrix, which is crucial for preventing environmental contamination. The review synthesizes recent advancements in the field, providing comprehensive insights into the chemical and mechanical characteristics of tailings-based geopolymers. It also discusses the challenges and prospects of integrating mine tailings into geopolymer production, aiming to promote sustainable construction practices and effective mining waste management.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109439"},"PeriodicalIF":4.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106729","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":"Activation of low-grade diasporic bauxite via sodium nitrate roasting coupled with alumina extraction in low-alkaline solution","authors":"Tianxiang Chen ,&nbsp;Kaifeng Pang ,&nbsp;Yuantao Wang ,&nbsp;Qingfa Zhao ,&nbsp;Haijun Ma ,&nbsp;Yifei Zhang","doi":"10.1016/j.mineng.2025.109442","DOIUrl":"10.1016/j.mineng.2025.109442","url":null,"abstract":"<div><div>With the rapid expansion of China's alumina industry and the depletion of high-grade bauxite, efficient utilization of low-grade diasporic bauxite has become a critical challenge. This study proposes an innovative method combining sodium nitrate activation roasting with low-alkali leaching to enhance alumina extraction. Activation roasting at moderate to high temperatures significantly improves bauxite solubility, and subsequent leaching with a low-concentration caustic soda solution (N_k = 160 g/L) enhances alumina dissolution. XRD analysis reveals that sodium nitrate promotes phase transformations, converting diaspore and kaolinite into Na_2-xAl_2-xSi_xO₄ at 700–1000 °C. Increasing the roasting temperature within the 700–1000 °C range lower the x value in Na_2-xAl_2-xSi_xO₄, but also inhibits its decomposition of Na_2-xAl_2-xSi_xO₄ into NaAlO₂ and Na₂SiO₃. At an aluminum-to-sodium nitrate molar ratio of 1 (N/A = 1), NaAlO₂, a highly soluble phase, forms predominantly at 750 °C. However, at 750 °C excessive roasting time or sodium nitrate leads to Na_2-xAl_2-xSi_xO₄ with increased x, reducing solubility. Through systematic optimization, we determined the ideal conditions: roasting at 750 °C for 2 h, followed by leaching at 270 °C for 60 min with a solid–liquid ratio of 300 g/L. This optimized process achieved an exceptional alumina leaching rate exceeding 75 % from bauxite with an initial alumina-to-silica ratio (A/S) ratio of 3.57, while maintaining silica dissolution at a minimal 0.59 %. The resulting red mud had an A/S ratio of 0.88, significantly lower than that of the Bayer process. This methodology not only enhances the leaching rate of alumina from low-grade bauxite but also provides a sustainable solution for the comprehensive utilization of low-grade bauxite resources.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109442"},"PeriodicalIF":4.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099656","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 of separating rare earth enrichment from aqueous solution by flat ceramic membrane process and pollution control strategy","authors":"Chonggang Wang ,&nbsp;Youming Yang ,&nbsp;Jiuyang Lin ,&nbsp;Feifei Yang ,&nbsp;Hongmei Ye ,&nbsp;Xuewei Li ,&nbsp;Yinhua Wan","doi":"10.1016/j.mineng.2025.109416","DOIUrl":"10.1016/j.mineng.2025.109416","url":null,"abstract":"<div><div>At present, in the mining process of ionic rare earths, the separation of rare earth element (REEt) from aqueous solution still relies on natural sedimentation, which has the disadvantage of low efficiency. Additionally, there will be a significant amount of rare earth ions (∼ 30 ppm) remaining in the supernatant. In this work, the use of flat ceramic membranes to separate REEt from aqueous solution is innovatively proposed. Firstly, the performance of REEt separation by flat ceramic membrane process was determined. It was found that the flat ceramic membrane process had good interception performance for REEt separation, and the concentration of rare earth ions in the supernatant was close to 0 ppm. Then, the impacts of different operating conditions (including operating time, backwash duration and concentration times) on the membrane fouling process were investigated. It was demonstrated that the shorter the operating time, the less the degree of membrane fouling. The operation of back washing was greatly beneficial to renew membrane flow. The change of reversible pollution resistance was calculated, the process of membrane pollution was analyzed by four pollution models, and the pollution mechanism was discussed in detail. Furthermore, the recovery of membrane flow after chemical cleaning and non-agent cleaning, and the changes in reversible fouling resistance under different concentration multiples were also studied. It is proved that the immersed flat ceramic membrane has the characteristics of low membrane fouling, high solid–liquid separation efficiency, and good stability for the separation and enrichment of rare earth particles, which shows great potential in industrial applications.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109416"},"PeriodicalIF":4.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089701","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":"Separation of arsenopyrite/loellingite and pyrite through bio-flotation by selective attachment of Leptospirillum ferrooxidans","authors":"Samar S. Almojadah ,&nbsp;Sarah L. Harmer","doi":"10.1016/j.mineng.2025.109440","DOIUrl":"10.1016/j.mineng.2025.109440","url":null,"abstract":"<div><div>The use of bacteria and their metabolites in lieu of chemicals in sulfide ore beneficiation holds promise for lessening the environmental damage caused by the minerals processing. In this study, the attachment of <em>Leptospirillum ferrooxidans</em> (<em>L. ferrooxidans)</em> to arsenopyrite/loellingite and pyrite was investigated through scanning electron microscopy (SEM). The effects of selective attachment, bacterial growth conditions, and extracellular polymeric substances (EPS) were investigated through bio-flotation. X-ray photoelectron spectroscopy (XPS) was utilised to determine the existence of surface species aiding in the separation. The results show <em>L. ferrooxidans</em> exhibits selective attachment to pyrite between 2 h and 72 h exposure via an indirect contact mechanism. Separation of pyrite from arsenopyrite/loellingite was achieved by exposing the minerals for 8 h with an <em>L. ferrooxidans</em> culture grown on HH media in the absence of a PIPX collector, for 10 h with an <em>L. ferrooxidans</em> culture grown on arsenopyrite in the absence of a PIPX collector, and for 10 h with an <em>L. ferrooxidans</em> culture grown on HH media in the presence of a PIPX collector. The results produced 52.2, 74.1, and 66.4 % recovery of pyrite, respectively. However, EPS supernatant extracted from <em>L. ferrooxidans</em> grown on pyrite, conditioned for 10 h in the presence of a PIPX collector, provided the best separation efficiency through the selective depression of arsenopyrite, resulting in 92.9 % pyrite recovery. Hydrophilic complex carbon structures, along with more arsenic oxides and a large amount of attached water, selectively attach to arsenopyrite exposed to EPS within 10 h, thereby depressing its floatability and ensuring a successful separation with a PIPX collector.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109440"},"PeriodicalIF":4.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099704","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":"Ring formation in semi-pilot rotary kiln during salt-roasting of vanadium-bearing titaniferous magnetite concentrate","authors":"Jungho Heo ,&nbsp;Hyunsik Park ,&nbsp;Youngjae Kim ,&nbsp;Dongju Shin","doi":"10.1016/j.mineng.2025.109429","DOIUrl":"10.1016/j.mineng.2025.109429","url":null,"abstract":"<div><div>The ring formation phenomena in a semi-pilot rotary kiln during the Na₂CO₃ salt-roasting process of vanadium-bearing titaniferous magnetite (VTM) concentrate was investigated. Ring-shaped particle agglomeration attributed to the sticking behavior of the VTM–Na₂CO₃ blended particles was observed during the salt-roasting process with 15 wt% Na₂CO₃ at 1323 K (1050℃). This observation is explained by the changes in the thermophysical properties of the blends in conjunction with the pseudo-binary phase diagrams of the VTM concentrate and Na₂CO₃.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109429"},"PeriodicalIF":4.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099657","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":"Modes of occurrence of rare earth-bearing minerals in South African coal and ash samples using electron microscopy","authors":"Sanki Biswas,&nbsp;Nicola J. Wagner,&nbsp;Ofentse M. Moroeng","doi":"10.1016/j.mineng.2025.109436","DOIUrl":"10.1016/j.mineng.2025.109436","url":null,"abstract":"<div><div>Rare earth elements and yttrium (REY) are crucial for modern technologies. This study investigated the modes of occurrence, mineral hosts, and distribution in coal and laboratory-derived coal-ash samples from the Soutpansberg Coalfield (South Africa) using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), mineral liberation analysis (MLA), X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP-MS). The mineral composition of the studied coal primarily comprises of silicates, predominantly kaolinite (avg. 24.1 wt%; whole coal basis), quartz (avg. 13.6 wt%), alongside carbonates (avg. 12.9 wt%) and pyrite (∼0.1 wt%). Although the coal-ash samples also have silicates (avg. 78.9 wt%), phosphates (monazite, xenotime), titanium oxides, and zircon. Average REY concentrations are 241.3 mg/kg in the coal and 468.3 mg/kg in the coal-ash, reaching a maximum of 957.4 mg/kg with multi-day multi-acid digestion, suggesting enhanced liberation.</div><div>Backscattered electron (BSE) images obtained via SEM-EDS and MLA reveal monazite and xenotime as the major REY-bearing minerals in both the coal and coal-ash samples, with some REY hosted by carbonates. In the coal, micron-scale REY-bearing minerals are adsorbed onto the surfaces of major and minor minerals such as quartz, kaolinite, zircon, and Ti-oxides. The REY-bearing minerals in the coal-ash are encapsulated within new phases, likely amorphous or aluminosilicates. The LREY and MREY are associated with monazite, quartz, carbonate, zircon, and Ti-oxide phases, and HREY with xenotime. Particles ∼ 1 μm in size show better liberation, which may potentially enhance extractability. MLA offers higher-resolution imaging than SEM-EDS, enabling better identification of micron-size REY particles.</div><div>These findings underscore the importance of understanding REY mineralogical associations and liberation dynamics to optimize extraction and enhancing resource recovery from coal and its by-products.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109436"},"PeriodicalIF":4.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099703","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":"Mechanism of flotation separation of scheelite from calcite using sulfonated phenolic resin as a novel depressant","authors":"Xu Wang ,&nbsp;Yanfang Cui","doi":"10.1016/j.mineng.2025.109393","DOIUrl":"10.1016/j.mineng.2025.109393","url":null,"abstract":"<div><div>To address the challenge of separating scheelite and calcite due to their similar physicochemical properties, this study employed sulfonated phenolic resin (SPR) as a depressant and evaluated its impacts on the flotation behavior of scheelite and calcite in the system with sodium oleate (NaOL) as a collector. The mechanism of SPR on scheelite and calcite surfaces was investigated by contact angle measurements, Zeta potential analysis, infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory simulations. The results demonstrated that scheelite and calcite could be effectively separated with a significant recovery difference of 51.33 % under conditions of 60.0 mg/L SPR at pH 9.5. Mechanism studies revealed SPR was adsorbed on the mineral surface through the interaction between the oxygen atoms in the sulfonic acid group and calcium ions. Moreover, SPR was more strongly adsorbed on calcite, with an adsorption energy of −81.05 kJ/mol on calcite, while the adsorption energy on scheelite was −57.89 kJ/mol. Consequently, SPR occupied more calcium adsorption sites on the calcite surface, significantly hindering the subsequent adsorption of NaOL on calcite, while causing minimal interference with NaOL adsorption on scheelite. This differential adsorption behavior enhanced the floatability contrast between the two minerals, thereby achieving the selective flotation separation of scheelite from calcite.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"230 ","pages":"Article 109393"},"PeriodicalIF":4.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084478","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}