MINERALS ENGINEERING
·
2018
·
IF 2.707
Dandan Gong,Kanggen Zhou,Changhong Peng,Junjie Li,Wei Chen
Extraction of tungsten from scheelite is important for the processing of tungsten resources for tungsten metallurgical companies. However, there are many difficulties to leach scheelite compared to wolframite. Compared with calcium tungstate (CaWO 4 ), magnesium tungstate (MgWO 4 ) is a readily soluble substance in NaOH solution. In this paper, conversion of CaWO 4 to MgWO 4 through roasting a mixture of scheelite and MgCl 2 was investigated systematically. The leaching performance of the roasted products in NaOH solution was also studied. Thermodynamic analyses and experimental results showed that MgWO 4 could be prepared through reaction of CaWO 4 with MgCl 2 . Increasing roasting temperature and MgCl 2 dosage could increase the extent of conversion of CaWO 4 to MgWO 4 . Additionally, leaching experiments showed a good leachability of the roasted products with a tungsten leaching efficiency of 98.79% in 4 M NaOH solution at 90 °C. This work may provide an alternative approach for the extraction of tungsten from scheelite.
研究领域:
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Hui Yang,Shuang Shao,Baozhong Ma,Yingwei Lv,Yongqiang Chen,Chengyan Wang
With the increasingly essential role of Li in new energy industry, Li extraction from ore has attracted active attention. In the prior study, a process combined thermal activation and alkali leaching was proposed to extract Li from Li concentrate. Previous research found that Li was precipitated as Li 2 SiO 3 and entered into the leach residue at the leaching temperature exceeded 100 °C. Drawing inspiration from this phenomenon, hydrothermal precipitation of Li as intermediate product Li 2 SiO 3 from the alkali leach liquor of Li concentrate was proposed. Firstly, the E–pH diagrams of Li–Si–H 2 O system were plotted to analyze the feasibility of hydrothermal precipitation Li. And the corresponding operation window was established. Subsequently, the effect of factors including Li/Si ratio, hydrothermal temperature and time, Li and NaOH concentrations on the migration behaviors of Li and Si were explored using the simulated leach liquor. The experimental results were in good consistence with the thermodynamic analysis. Ultimately, the leach liquor was used to precipitate Li at the determined optimal conditions, and the Li precipitation efficiency reached 91.0%. This study provided an innovative strategy for separating Li from the alkali leach liquor of Li concentrate without adding any reagents. An economical and sustainable route for synergistic extraction of Li, Rb, and Cs from Li concentrate was also proposed.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PLoS One
·
2025
·Vol. 20
·期 2
·e0316172
·
IF 2.6
Nian Liu,Chaoyi Chen,Junqi Li,Dong Liang
The raw material for smelting brown corundum is high-quality bauxite. As the quality of bauxite decreases, the main impurity, silicon content, increases, which affects the product quality and smelting energy consumption. Additionally, the smelting process produces a significant amount of brown corundum fly dust (BCFD) with a low utilization rate, resulting in resource wastage. In order to utilize low-quality bauxite and BCFD, this article proposes the method of “roasting-alkali leaching.” Through mixed desilication, the impact of alkali leaching factors on desilication is investigated, analyzed the desiliconization mechanism of BCFD, and established the kinetics of the desilication reaction. Results indicated that the optimal conditions for mixed desilication are BCFD/bauxite mass ratio of 1:6, desilication temperature of 95°C, desilication time of 30 min, alkali concentration of 110 g/L, and liquid-solid ratio of 10:1, achieving a desilication rate of 60.90%. The Al-Si ratio (A/S) of the concentrate increases from 5.33 to 11.72, meeting the requirements for brown corundum smelting raw materials. The desilication reaction follows a solid shrinkage core model, with a kinetic equation of 1−2/3α−(1−α) 2/3 = 15.50exp[−29299/(RT)]·t, and an apparent activation energy of 29.30 kJ/mol. The synergistic mechanism involves fine particles of the BCFD adsorbing on the surface after mixing with the bauxite, increasing the mineral surface area and the activity of silicon, thereby accelerating the reaction rate.
研究领域:
冶金工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
RARE METALS
·
2018
·Vol. 38
·期 1
·1-13
·
IF 1.5
Liu Qi,Wang Wen-Qiang,Yang Yue,Liu Xue-Gang,Xu Sheng-Ming
Aluminum recovery is a key issue for the overall recycling of valuable metals from spent catalysts. This paper focuses on the recovery and regeneration of alumina with high additional value from the spent hydrodesulfurization catalyst CoMo/Al 2 O 3 . The results indicate that 98.13% alumina is successfully leached from the treated spent catalysts by an alkaline leaching process under the conditions of 5 mol·L −1 sodium hydroxide, a liquid/solid ratio of 20 ml·g −1 , a temperature of 160 °C and a reaction time of 4 h. In the leaching residue, no difficult leaching compound is found and cobalt and nickel are enriched, both of which are conducive to the subsequent metal recovery step. The reaction order of aluminum leaching is 0.99. This reaction fits well with the interfacial chemical reaction model, and its apparent activation energy is calculated as 45.50 kJ·mol −1 . Subsequently, γ-Al 2 O 3 with a high specific surface area of 278.3 m 2 ·g −1 , a mean size of 2.2 μm and an average pore size of 3.10 nm is then regenerated from the lixivium, indicating its suitability for use as a catalyst carrier. The recovery and regeneration of alumina from spent catalysts can not only significantly contribute to the total recycling of such hazardous spent catalysts but also provide a new approach for the preparation of γ-Al 2 O 3 with a high specific surface area using spent catalysts as the aluminum sources.
研究领域:
化学工程
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Zhao-wang DONG,Xue-yi GUO,Yang XIA,Pei-dong LIU,Jin-xi QIAO,Zhong-chen LI,Han-ning LIU
Silicon in two types of upgraded titania slag (UGS) containing different components was removed using a low-temperature alkali solution and melt leaching. The effects of temperature, time, and NaOH solution concentration on desilication rate were investigated. Desilication in melt can lead to the loss of titanium in upgraded titania slag. After agitating at a speed of 600 r/min and 80 °C for 300 min, the silicon content in domestic slag decreased from 0.96 wt.% to 0.29 wt.%, and the leaching rate was 69.8% after leaching in 4 mol/L sodium hydroxide solution. Under the same conditions, the silicon content in imported slag decreased from 1.11 wt.% to 0.12 wt.%, and the desilication rate was up to 89.2%. The alloy powders obtained from the reduction of upgraded titania slag with magnesium were sintered to produce titanium alloy, and the alloy was characterized. It was determined that the Ti 5 Si 3 phase in the titanium alloy product was successfully eliminated. In addition, the two UGS materials and the chemical principle of desiliconization were analyzed using a thermodynamic software.
研究领域:
材料科学
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冶金工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 53
·114327-114335
·
IF 5.8
Zhou Hao,Zhang Dayong,Jiang Yongjun,Zeng Bo,Zhao Chenxi,Zhang Mingjie,Zeng Baiyan,Zhu Xiaoquan,Su Xintai,Romanovski Valentin,Bi Ran
The spent carbon cathode (SCC) is a hazardous solid waste from aluminum production. It has an abundant carbon source and a unique graphitic carbon layer structure, making it a valuable waste for recycling. This paper uses alkaline and acid leaching methods to report a straightforward way of extracting recovered carbon (RC) from SCC as anode material for lithium-ion batteries (LIBs). The results show that alkaline and acid leaching conditions at 70 °C with 1 M NaOH and HCl solution individually in 6 h and a liquid-solid ratio of 20:1 can result in RC with up to 94.63% carbon content than 49.38% in SCC, exhibiting a typical graphite structure. SCC and RC materials are obtained after calcination at 400 °C in an inert atmosphere and used as anode materials (SCC-400 and RC-400). In this paper, The initial charging specific capacities are 490.0 mA h g −1 , 195.4 mA h g −1 , and 423.2 mA h g −1 and initial coulombic efficiencies (ICE) are 67.8%, 78.9%, and 72.0% of RC-400, SCC, and SCC-400. RC-400 also shows excellent capacity retention and impedance values. This exciting finding provides a viable, non-hazardous, and resourceful method for treating and disposing of SCC from aluminum electrolysis.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Zhang Lei,Wang Hengliang,Lei Zhang,Jia Yang,Liu Jianwei,Wang Jingli
Using fly ash acid leaching residue as the silicon source, sodium silicate solution was produced by alkali leaching and the wet gel was obtained by the sol-gel method. Hexamethyldisiloxane (HMDSO) was used to modify the surface of the wet gel, thereby reducing the capillary tension during the atmospheric pressure drying process, and finally preparing a silica aerogel material with hydrophobic properties. The effects of different alkali leaching conditions, different sol pH, HMDSO dosage on the aerogel density and the changes of aerogel material properties and composition during the preparation process were investigated, and the reaction mechanism of silica aerogel preparation by atmospheric pressure drying was described. The results showed that the optimum conditions for alkali leaching were 20 wt% NaOH concentration, 2 h reaction time and 100 °C, and the desilication rate was 81.72%; the lowest Silica aerogel density of 108 mg/cm 3 at pH 5 to 6; the lowest density of silica aerogel was 110 mg/cm 3 at a modifier to wet gel volume ratio of 1:1.4.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Ying Gao,Jiafeng Zhang,Yanan Tu,Weidong Wang,Ziqi Zhu,Zhiqiang Xu
The preparation of hierarchical porous silica aerogels from coal gasification fine slag (CGFS) offers an effective approach to achieving high-value utilization of solid waste and reducing the production cost of solid adsorbent matrix materials. However, the main challenges involve overcoming technical barriers to efficiently and value-added conversion of CGFS into silica aerogels with CO₂ adsorption properties, as well as elucidating the phase transformation mechanisms during the synthesis process. In this study, CGFS was used as the raw material to obtain a silicon-containing precursor through pre-decarbonization (with ash content as high as 99.82 %) and alkali dissolution treatment. A hierarchical porous silica aerogel was then synthesized using an efficient hydrothermal process. The effect of alkali dissolution on silicon extraction and the phase transformation mechanisms were thoroughly discussed, and the leaching mechanism was analyzed through thermodynamic and kinetic models. The results showed that the high leaching rate of silicon was attributed to the presence of a large amount of amorphous SiO₂ in the decarbonized fine slag (DCFS), while the formation of zeolite Na-P1 and hydroxysodalite during the alkali dissolution process affected the efficiency of silicon extraction. Then, the structural formation mechanism and CO₂ adsorption properties of the hierarchical porous silica aerogels were analyzed using N₂ adsorption-desorption and CO₂-TPD. The SiO₂-1-30-0.5 exhibited a high CO₂ adsorption ability of 1.53 mmol g −1 , and the CO₂ adsorption capacity maintained 94.78 % of the original value and after 5 adsorption-desorption cycles.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Bo Li,Haijun Guo,Zhen Xiong,Lian Xiong,Shimiao Yao,Mengkun Wang,Hairong Zhang,Xinde Chen
γ-valerolactone (GVL) is a sustainable chemical, which can be obtained by hydrogenation of levulinic acid (LA) and levulinate. Herein, we reported a solvent-free hydrogenation of butyl levulinate (BL) to GVL and 1,4-pentanediol (1,4-PDO) over a skeletal Cu-Al-Zn catalyst. The skeletal Cu-Al-Zn catalyst was prepared from Devarda's alloy by alkali leaching and the catalyst was characterized by different analysis methods. The aluminum in the Devarda's alloy was dissolved by sodium hydroxide in the leaching process and many active Cu atoms were generated on the catalyst surface and the skeletal Cu-Al-Zn exhibited many micrometer-scale irregular particles with rough surface. The skeletal Cu-Al-Zn catalyst showed the excellent performance in the solvent-free hydrogenation of BL to GVL under constant hydrogen pressure (5 wt% catalyst loading, 180°C, 6 MPa of H 2 , 6 h): the LA conversion was 100%, the GVL yield was 74.75% and the 1,4-PDO yield was 25.63%. Moreover, the catalyst showed stable performance and it was reusable up to 5 times without apparent loss of activity. A stable hydrogen pressure with Zn would suppressed the dehydration of 1,4-PDO.
研究领域:
催化
·
绿色化学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Congyuan Zhang,Zhanjian Liu,Xiguang Zhang,Chijia Wang,Meiling Li,Ruixia Yuan,Huaiyuan Wang
Superhydrophobic coatings with attractive antifouling, anti-icing, and antiadhesion properties have considerable application potential. However, their instability hinders their large-scale application. In this study, a robust superhydrophobic microcapsule (MC)-based composite fluoroethylene vinyl ether/fluorinated ethylene propylene/carbon nanotubes (CNTs)/microcapsule (MC) coating was fabricated by emulsion polymerization and one-step spraying. Owing to the responsive release of hydroxyl-fluoro silicone oil (HFSO) from MCs and self-lubricating effect of CNTs, the superhydrophobicity of the as-prepared coating was retained after 1000 cycles of abrasion and 7 d of a strong acid/alkali immersion. Moreover, the MC-based superhydrophobic coating exhibited an excellent anti-scaling property under water-flowing conditions, which can be attributed to the cooperative effect of the air film trapped in the uniform micro/nanostructures and the stable lubricant layer formed by the released HFSO. The impact resistance of the MC-based coating was excellent, and its superhydrophobicity was retained even under sand impacting (1100 g), water jetting (338 kPa), and slurry contamination (100 cycles). This study provides a simple and effective approach for fabricating a robust superhydrophpobic coating with self-healing and anti-scaling properties. Further, it paves the way for developing superhydrophobic coatings that can be used in under harsh environments, such as in oil–gas gathering and transferring pipelines.
研究领域:
材料科学
·
表面工程
·
化学工程
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 12
·1-12
·
IF 0
Wang Yijing,Jin Ling,Xue Tao,Shao Feifei,Yao Yuan,Li Xinxin
The application of pH-responsive superwetting materials receives increasing attention in oil/water separation. In this work, a mussel inspired robust surface coating fabricated with dopamine, copolymer PDMAEMA- co -PHEMA- co -PHFBMA (PDHH) and SiO 2 nanoparticles (DPS) was formed on stainless steel mesh to perform multiple repeatable oil/water separation. Herein, dopamine was chosen to provide strong adhesion strength and durability, endowing the mesh excellent stability in harsh environments, such as mechanical abrasion, acid/alkali immersion and UV irradiation. In virtue of pH stimulation, the as-prepared mesh can be reversibly switched between superhydrophobicity and superhydrophilicity. Moreover, the mesh possesses remarkable oil/water separation efficiency (SE) (≥98%) and desirable recyclability. An oil collector prepared by the mesh and kapok fiber showed good oil absorption capability in the range of 39.67–79.56 g/g. The facile and inexpensive preparation of the durable separation device enables it promising in actual oil/water separation. Graphic abstract
研究领域:
材料科学
·
环境工程
·
化学
✓ 已验证
产品关联
DOI
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Wenhao Ding,Guolang Zhou,Shizheng Wen,Jingzhou Yin,Cheng Liu,Yongsheng Fu,Lili Zhang
Two-dimensional carbonaceous materials have sparked extensive attention in organic pollutants adsorption due to their unique structure to facilitate the formation of the physical or chemical bonding. Herein, natural two-dimensional porous activated carbon nanosheets with ultra-high specific surface area (2276.44 m 2 g −1 ) are prepared by alkaline immersion-assisted circulating calcination techniques from corn straw piths. The prepared nanosheets exhibit rapid tetracycline adsorption capacity (633 mg g −1 within 5 min) and high equilibrium adsorption capacity of 804.5 mg g −1 . Significantly, the nanosheets can adapt to a wide range of pH (at least between pH = 3–10) and are almost unaffected by coexisting ions. Mechanism studies and theoretical calculations demonstrate that the rapid and high-efficient adsorption of tetracycline mainly depends on the π-π electron donor receptor interactions. In addition, hydrogen bonding and pore filling was also responsible for tetracycline adsorption. This work provides important guidance for the development of the biobased high-performance adsorbents from agricultural waste.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
污染控制
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）