ChemistrySelect
·
2024
·Vol. 9
·期 1
·e202304480
·
IF 1.9
Lu Xiong,Haisheng Hu,Meitang Liu,Lun Zhuang,Yunfei Li
Graphical The graphical summary shows the preparation of lithium carbonate from α -lithium pyroxene using an alkaline roasting process in a low-energy method. This new method achieves the full utilization of spodumene with lower energy consumption and demonstrates great potential for industrial applications. Extracting lithium from spodumene by sulfuric acid roasting is the largest commercialized way at present, which not only consumes a large amount of energy but also produces massive waste residue that will cause environmental problems. In this work, a new process for extracting lithium by directly decomposing α -spodumene through alkali calcination is designed. The reaction of α -spodumene with Na 2 CO 3 at 750 °C for 2 h can decompose it and form nepheline and lithium silicate/sodium silicate. The nepheline and soluble lithium silicate/sodium silicate are separated by water leaching, and 93.9 % of lithium can be leached under optimal conditions. In addition, the synthesis of nano-kaolinite is investigated with nitric acid solutions. Conversions of 98.7 % were obtained with 0.4 M nitric acid at 250 °C and an L/S ratio of 17.5 L/kg. The water leachate can precipitate Li 2 CO 3 with a purity of 99.0 % by CO 2 after desilicated by CaO. The final yields of Li 2 CO 3 and kaolinite relative to the Li and Si content of the starting minerals are 91.4 % and 48.5 %, respectively. This new method achieves the full utilization of spodumene with lower energy consumption and demonstrates great potential for industrial applications.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lingzhi Zhou,Xian Xie,Xiong Tong,Jing Qi,Ruiqi Xie,Jichang Tu
This study introduced α-Benzoin oxime (BO) as a novel and efficient collector for the selective flotation of ilmenite from diopside. Micro-flotation experiments demonstrated that BO exhibits superior collection performance compared to benzohydroxamic acid (BHA) under weakly acidic to neutral conditions. At pH 8 and a BO dosage of 5× 10 -4 mol/L, flotation tests on ilmenite-diopside mixed minerals achieved a TiO 2 recovery of 89.90 % with a TiO 2 grade of 47.84 %. Contact angle measurements revealed that BO adsorption notably enhances the hydrophobicity of ilmenite surfaces. Zeta potential and FTIR analyses confirmed the selective adsorption of BO onto ilmenite. Furthermore, XPS and TOF-SIMS results indicated that coordination bonds formed between the C–O and C=N–OH groups in BO and Fe(II) ions on the ilmenite surface may facilitate BO adsorption. These findings provide valuable insights into the interaction mechanism between BO and ilmenite, highlighting its potential as an efficient collector for ilmenite flotation.
研究领域:
矿物加工工程
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材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2021
·Vol. 13
·期 20
·11144
·
IF 3.251
Wei Zhao,Xiaofeng Huang,Bingji Yan,Shaoyan Hu,Hongwei Guo,Dong Chen
Diopside-based glass-ceramics are successfully produced by recycling blast furnace slag and fluorite tailing with the addition of supplementary elements such as TiO2, Fe2O3and Cr2O3as nucleation agents, using a conventional melting method. The effects of various nucleating agents on the phase components and structure of the prepared glass-ceramics were evaluated by a differential scanning calorimeter, X-ray diffraction and scanning electron microscope–energy disperse spectrometer methods to determine the optimal dosage of nucleating agents. The results show that, in the preparation of diopside-based glass-ceramics, the suitable percentages of blast furnace and fluorite tailing are 55% and 45%, and the recommended composite nucleating agents consist of 1.5% Cr2O3, 2% TiO2and 3% Fe2O3. Heat treatment was conducted at a nucleation temperature of 720 °C and a crystallization temperature of 920 °C, and the nucleation and crystallization durations were 1.0 h and 1.5 h, respectively. Under the abovementioned parameters, the obtained diopside-based glass-ceramics displayed a Vickers hardness of 7.12 GPa, density of 2.95 g·cm−3, water absorption of 0.02%, acid resistance of 0.23% and alkali resistance of 0.02%.Keywords:blast furnace slag;fluorite tailing;diopside;glass-ceramics;nucleating agent
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 3
·661-669
·
IF 1.772
Jin Zhengwei,Yu Changjun,Wang Ruyang,Wei Wei,Jing Yunhuan,Wang Qi
The production of precipitated calcium carbonate (PCC) from carbonate-free minerals and CO 2 from industrial exhaust gas could lower energy consumption and promote CO 2 sequestration. The present study proposes a chemical looping process for the production of PCC from wollastonite (calcium silicate) and CO 2 from industrial exhaust using ammonium chloride as the looping medium; this study also included a pilot setup with a capacity of 3 kg of carbonate per hour to demonstrate the process. The process consisted of three phases: extraction of calcium from the wollastonite with hydrochloric acid; carbonation of the CO 2 in the extract solution in the presence of ammonia to produce calcium carbonate while generating ammonium chloride; and regeneration of hydrochloric acid and ammonia by the decomposition of ammonium chloride. A special air-lift reactor with an integrated settling vessel was designed for the carbonation reaction. The extraction and carbonation conditions were optimized, and fine calcium carbonate with a purity greater than 98% and a particle size of 2 μm was produced. The overall utilization of the calcium from wollastonite and the CO 2 reached 99 and 90%, respectively. This process avoids the high-temperature pyrolysis of limestone and thus consumes less energy. It also sequesters CO 2 from industrial exhaust and is a green and high-performing process for the production of PCC.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yutian Lu,Weijia Guo,Chongyang Zhang,Zhenxing Yue
The rapid development of fifth/sixth-generation (5 G/6 G) telecommunication technologies has led to increased demands for silicate ceramic materials. In this work, Ge 4+ -substituted diopside , CaMg 0.9 Zn 0.1 Si 2- x Ge x O 6 (CMZSG, x = 0.0–2.0) ceramics were synthesized via the conventional solid-state method. All samples were sintered densely at 1200 ℃ for 4 h. CMZSG ceramics keep a single phase with C 2/ c and the lattice parameters vary smoothly with x . When 0.1 ≤ x ≤ 0.8, Ge 4+ substitution prevents the abnormal grain growth . CMZSG ceramics have enhanced dielectric properties after substituting Ge 4+ , and the sample with x = 0.1 has the greatest dielectric properties with ε r = 7.78 and Q × f = 190,300 GHz. The dielectric properties in the microwave and terahertz bands are compared, and the larger ε r and Q × f values in the terahertz band are found due to the withdrawal of the partial polarization mechanism and different measurement methods. The relationship between lattice distortions and the dielectric properties is established. Both the local distortion in [Si/GeO 4 ] tetrahedra chain and the distortion within [Si/GeO 4 ] tetrahedron are found to contribute to the enhancement of Q × f values. Furthermore, the increased lattice expansion and the distortion within [Si/GeO 4 ] tetrahedron contribute to a larger negative τ f . These conclusions can guide us to design silicate ceramics with higher Q × f values and near-zero τ f for application. The CaMg 0.9 Zn 0.1 Si 1.9 Ge 0.1 O 6 ceramics exhibit excellent dielectric properties with ε r = 7.48 and Q × f = 303,400 GHz in the terahertz band, rendering it a promising dielectric material for future terahertz mobile communication systems.
研究领域:
材料科学
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无机非金属材料
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功能陶瓷
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介电材料
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通信技术
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Siyu Han,Yingchun Song,Tongyao Ju,Yuan Meng,Fanzhi Meng,Mengzhu Song,Li Lin,Mengdan Liu,Jinglin Li,Jianguo Jiang
Municipal solid waste incineration (MSWI) fly ash is classified as hazardous waste and requires proper treatments. Sintering of MSWI fly ash for the production of lightweight aggregate (LWA) is a promising treatment technology , while the dependence on natural bloating clay to produce high quality LWA has limited its wide application. In this study, by using SiC as a bloating agent, normal clay could be used to produce super-lightweight aggregate (bulk density <500 kg/m 3 ) with MSWI fly ash. Effects of SiC addition amount, sintering temperature and duration on LWA performance were studied. The results showed that LWA with SiC addition of 0.1–0.5 wt% had significant expansion at sintering temperature of 1120 °C–1160 °C. The optimal conditions were 0.3 wt% SiC addition and sintering at 1120 °C for 30 min, and the bulk density could reach 212 kg/m 3 with other properties meeting the LWA standard (GB/T 17431.1-2010). Further, the heavy metal leaching toxicity was significantly decreased after sintering and met the MSWI fly ash utilization standard (HJ 1134–2020). The X-ray diffraction results revealed the formation of a complex diopside-based phase after sintering. This study provides a new approach for recycling MSWI fly ash in LWA without dependence on specific clay resources, and makes this technology wider applicability.
研究领域:
环境工程
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材料科学
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废物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2024
·Vol. 14
·期 3
·183
·
IF 3.8
Jiarong Ma,Run Zhou,Yu Tu,Ruixin Ma,Daimei Chen,Hao Ding
Ni3Si2O5(OH)4rods (NS) were synthesized via a hydrothermal method, employing natural wollastonite as a template. The hierarchical Ni3Si2O5(OH)4rods exhibited vertically oriented nanosheets, resulting in a substantial increase in the specific surface area (from 2.24 m2/g to 178.4 m2/g). Subsequently, a CdS/Ni3Si2O5(OH)4composite photocatalyst (CdS/NS) was prepared using a chemical deposition method. CdS was uniformly loaded onto the surface of the Ni3Si2O5(OH)4nanosheets, successfully forming a heterojunction with Ni3Si2O5(OH)4. The CdS/NS photocatalyst in the presence of lactic acid as a sacrificial agent demonstrated an impressive H2production rate of 4.05 mmol h−1g−1, around 40 times higher than pure CdS. The photocorrosion of CdS was effectively solved after loading. After four cycles, the performance of CdS/NS remained stable, showing the potential for sustainable applications. After photoexcitation, electrons moved from Ni3Si2O5(OH)4to the valence band of CdS, where they interacted with the holes via an enhanced interface contact. Simultaneously, electrons in CdS transitioned to its conduction band, facilitating hydrogenation. The enhanced performance was attributed to the improved CdS dispersion by Ni3Si2O5(OH)4loading and efficient photogenerated carrier separation through the heterojunction formation. This work provides new perspectives for broadening the applications of mineral materials and developing heterojunction photocatalysts with good dispersibility and recyclability.
研究领域:
材料科学
·
纳米技术
·
催化
·
能源材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junnan Wu,Chen Jiao,Hanjiao Yu,Huixin Liang,Jianfeng Zhao,Zongjun Tian,Changjiang Wang,Lida Shen,Dongsheng Wang
Today, hydroxyapatite (HA)-based composite scaffolds are widely studied, but there is a lack of a doping method that can simultaneously improve the mechanical strength, degradation rate, and bioactivity of HA scaffolds. In this paper, the amorphous magnesium silicate (MS) with a low melting point is selected as the doping phase of HA. The hydroxyapatite/magnesium silicate composite was fabricated using photocuring technology. In addition, at high temperatures, ionic substitution can occur between the magnesium silicate glass phase and the HA lattice. Therefore, a new phase with a pinning effect can be obtained at the grain boundary and the magnesium silicate can further improve the biocompatibility of HA scaffolds. In the sintering process, the magnesium silicate was melted to a liquid state, and then the sintering temperature of the scaffold was reduced for grain refinement. The morphological analysis shows that MS doping is an important factor for grain refinement, which has been reduced from 12 μm to 6 μm. Furthermore, the formation of new diopside and whitlockite phases with a pinning effect has been observed at the grain boundaries. Specifically, the compressive stress of the composite scaffold is increased by 59.15% compared to the pure HA scaffold. However, the soaking and cell experimental findings show that the composite scaffold has a better degradation rate, cell activity, and bone induction. Finally, this study found that a composite scaffold with improved mechanical strength, degradation performance, and biocompatibility can be obtained with the addition of magnesium silicate as the doping phase of HA with 30 wt% of.
研究领域:
材料科学
·
生物材料
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yucheng Cao,Liangbin Zhang,Hongrong Mei,Zhenggang Rao,Tingfang Tian,Chunchun Li
The monoclinic diopside structured CaMgGe 2 O 6 dielectric ceramics were synthesized by the traditional solid-phase reaction method, and their microwave dielectric properties were characterized. X-ray diffraction (XRD) and Rietveld refinement revealed that CaMgGe 2 O 6 belongs to the monoclinic system of space group C2/c. SEM images showed that dense CaMgGe 2 O 6 ceramics could be formed at the optimum sintering temperature of 1300 °C. Typically, ceramic sintered at 1300 °C for 6 h possessed outstanding microwave dielectric properties with ε r ∼7.96, Q × f ∼41,280 GHz, and τ f ∼ −46.6 ppm/°C. Far-infrared spectra analysis revealed the intrinsic microwave dielectric properties of CaMgGe 2 O 6 ceramics. These findings demonstrate promising application prospects of CaMgGe 2 O 6 in microwave substrate materials.
研究领域:
材料科学
·
陶瓷
·
微波工程
·
介电材料
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 2
·2300963
·
IF 11
Weibin Chen,Yuzhen Wang,Jian Xu,Xinrong Chen,Ole B. Jensen,Qinyuan Zhang,Zhiguo Xia
Laser-driven phosphor-converted white-laser diodes are supposed to be next-generation high-brightness lighting sources for their unparalleled photoelectric efficiency and light quality, yet a significant obstacle hitherto has resided in the shortage and serious laser-induced luminescence saturation of red emitters. Here, a hot-pressing synthesis route to obtain high-performance red-emitting cordierite (Mg 2 Al 4 Si 5 O 18 :Eu 2+ ) ceramic is developed, which enables the in situ formation of bulk specimens with high crystallinity (>90%) from the counterpart glass powders. A preeminent saturation threshold of 21 W mm −2 is realized in a red-emitting Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramic film converter. More importantly, the luminous exitance reaches 209 lm mm −2 , which is 5 times that of commercial red phosphor-converted-LED, indicating breakthrough progress in the comprehensive light-emitting performance of red converters. This work innovates the solid-state synthesis of laser bulk converters from glass to meet the demanding requirements of advanced warm white laser lighting.
研究领域:
材料科学
·
光电技术
·
照明技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xinyuan Yuan,Tingting Wu,Teliang Lu,Fupo He,Peng Chen,Ning Ma,Jiandong Ye
Based on the good osteogenic and angiogenic effects of silicon and magnesium elements, three types of micro-nano magnesium-containing silicates (MS), including akermanite (Ake, Ca 2 MgSi 2 O 7 ), diopside (Dio, CaMgSi 2 O 6 ) and forsterite (For, Mg 2 SiO 4 ), were incorporated into calcium phosphate cement (CPC) to improve its osteogenic and angiogenic performances for clinical application. In this present work, the physicochemical properties, osteogenesis and angiogenesis of MS/CPCs (Ake/CPCs, Dio/CPCs and For/CPCs) were investigated systematically and comparatively. The results showed that all MS/CPCs had good biomineralization and significantly stimulated the osteogenic differentiation of mBMSCs and angiogenic differentiation of HUVECs, respectively. Besides, the stimulating effects were related to not only the category of MS, but also the content of MS. The For/CPCs had a good angiogenic property but their initial setting times were beyond 60 min. The Dio/CPCs showed the lowest biological performance among the three groups of MS/CPCs due to the lower ion release (Si and Mg). The Ake was the ideal modifier that could provide CPC with appropriate physicochemical properties, better osteogenesis and angiogenesis. Simultaneously, a higher addition (10 wt%) of akermanite resulted in the best potential to bone regeneration. Taken together, this research provides an effective approach to improve the overall performance of CPC, and 10Ake/CPC is of great promising prospect in bone repair.
研究领域:
生物材料
·
组织工程
·
骨科
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Huifeng Shao,Zhuoluo Jing,Pengcheng Xia,Tao Zhang,Zhiheng Nian,Wanshun Liu,Jiahua Zhu,Youping Gong,Rougang Zhou,Yong He,Qingqiang Yao
It is still a major challenge to remove tumor cells and fill bone defects after tumor resection. Combined with the 3D printing technology, the composite bioceramics scaffolds were fabricated with interconnected porous magnesium-doped wollastonite (CSi-Mg) scaffolds as the architecture and nano-hydroxyapatite ( n -HA) as the surface. The influence of manufacturing process on the n -HA layer thickness and degradation performance, biological performance and anti-tumor performance of the composite scaffolds were investigated. The n -HA surface layer could effectively retard the degradation rate of CSi-Mg scaffolds and maintain high mechanical strength (over 90 MPa) after immersion in simulated body fluid for 3 weeks. Meanwhile, CSi-Mg/n-HA3 scaffold induced about 50 % of cell death for human osteosarcoma cells (MG-63) in vitro. CSi-Mg/ n -HAx (x = 1, 3) scaffolds could improve the osteogenic performance of Rat BMSC. These findings demonstrate that the bioceramic composite scaffold with high strength, good osteogenic performance and anti-tumor performance is promising for the treatment of tissue injury after resection of osteosarcoma.
研究领域:
生物材料
·
生物医学工程
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组织工程
·
癌症研究
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）