Minerals
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2022
·Vol. 12
·期 8
·963
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IF 2.818
Dongsheng Ren
Quartz is an important component of the Earth. In this study, experiments were conducted at temperatures between 600 to 700 °C, confining pressures between 1.5 and 1.8 GPa, and differential stress conditions. It was found that coesite production is closely related to differential stress, reaction time, and reaction temperature, with coesite formation being a multifactorial coupling process.Keywords:high temperature;high pressure;differential stress;coesite;phase transition
研究领域:
地质学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wencai Dong,Haiqiang Ma,Rongzhen Liu,Taoxin Liu,Shijia Li,Chonggao Bao,Suocheng Song
Chopped quartz fiber-reinforced fused silica (SiO 2 f /SiO 2 ) composites were fabricated by stereolithography . The fiber orientation characteristics and crack distributions after the debinding process of the green bodies were investigated. The results showed that the distribution of fibers presented orientation characteristics; additionally, the number of cracks after debinding decreased as the fiber content increased and the cracks oriented along the fiber orientation. The mechanical properties of SiO 2 f /SiO 2 ceramics with different fiber contents were also considered. As a result, a compressive strength of 51.2 MPa and flexural strength of 24.3 MPa were achieved for the SiO 2 f /SiO 2 ceramic with 4 wt% fiber, and a sintered cambered structure with a size over 150 mm × 150 mm × 3 mm was fabricated successfully without cracking and deformation for the SiO 2 f /SiO 2 composites with a fiber content of 4 wt% and 6 wt%.
研究领域:
材料科学
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制造工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qinglong Zhang,Youwang Hu,Dejian Kong,Haikuan Chen,Ji'an Duan,Xiaoyan Sun
The preparation of fused silica glass with microstructural patterns has attracted considerable interest, and the process chain of using nano-silica powders mixed with organic polymers to prepare composites for molding, degreasing, and sintering provides a good solution. However, the potential negative effects of organic residues cannot be avoided. In this study, a pattern stencil replication method with silica gel using high-purity quartz fibers as reinforcement is proposed for preparing micropatterned fused silica glass. The microscopic morphology and mechanical properties before and after silica gel drying and the optical properties of fused silica glass obtained by sintering were evaluated via transmission electron microscopy), three-point bending strength test, scanning electron microscopy, X-ray diffraction spectrum analysis, ultraviolet–visible and infrared measurements. The results showed that quartz fiber as a reinforcer could shorten the drying time of the gel and did not degrade the quality of the fused silica glass obtained by sintering. Laser confocal test results showed that microlens arrays were generated by template replication, demonstrating the feasibility of molding fused silica lens arrays with small feature sizes and providing new ideas for the preparation of bulk fused silica glass or micropatterned glass.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2024
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IF 1.8
Yansong Liu,Wenbo Li,Yongsheng Liu,Yu Pan,Yejie Cao,Xiang Zheng,Jian Chen,Yijiang Zeng
In this work, alumina was selected as the second phase reinforced fused quartz ceramics and SiO 2 –Al 2 O 3 composite ceramics were fabricated via digital light processing (DLP) 3D-printing. The effect of the sintering procedure on the mechanical and dielectric properties of SiO 2 –Al 2 O 3 composite ceramics were investigated in detail. The results show that the amount of cristobalite precipitation is the key factor affecting the properties of composite ceramics. The amount of cristobalite precipitation in composite ceramics could be controlled effectively by adjusting the heating rate, holding time, and sintering temperature. The sintering procedure is set as the heating rate of 4°C/min, sintering temperature of 1200°C, and holding time for 2 h, the flexural strength of SiO 2 –Al 2 O 3 composite ceramic is 47.13 MPa, dielectric constant ranges from 2.90 to 2.97, and the tangent of loss angle is less than 0.041. SiO 2 –Al 2 O 3 composite ceramics with high flexural strength and low dielectric constant were obtained by sintering procedure screening and optimization.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
Silicon
·
2019
·Vol. 12
·期 2
·327-338
·
IF 1.21
Wei Mengnan,Ban Boyuan,Li Jingwei,Sun Jifei,Li Feifei,Jiang Xuesong,Chen Jian
A novel green cationic surfactant Poly (propylene glycol) bis (2-aminopropyl ether) (PEA) with multiple amine groups was utilized as a collector for flotation separation of quartz from feldspar-quartz associated ore (FQA) without acid (particularly, HF) and alkali. The collecting performances and the adsorption mechanisms of PEA on the quartz/FQA were investigated through flotation experiments, ICP-OES, XRD, Zeta potential, FTIR and XPS measurements. A remarkable separation of the quartz from FQA has been realized in an environmental friendly way. The froth flotation results show that the flotation recovery of quartz is 97.79% and that of FQA is 19.30% at pH 9.00–9.50 with 10 −4 M PEA when the particle size ranges from 150 to 270 μm. The results of batch flotation, ICP-OES and XRD analyses show that the first flotation product is almost quartz, while more feldspar and little quartz exist in the sink product when compared with the FQA feed. The mechanism of PEA acting as the collector for the separation of quartz/feldspar has been investigated. The PEA is adsorbed on the quartz surface by electrostatic and hydrogen bonding interaction with ─NH 3 + /─NH 2 head groups, while is less adsorbed on the feldspar surface due to electrostatic repulsion between the K + / Na + ions and the positively charged ─NH 3 + /─NH 2 head groups of PEA. A conceptual adsorption model of the PEA cationic collector on the quartz and the FQA surfaces has been proposed.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuang Yin,Jiajun Liu,Chengyun Sun,Yao Zhang,Liqiang Liu,Ruzhong Zuo
In this study, high-performance fused silica ceramics were fabricated from bimodal distribution powders via gelcasting and pressureless sintering. The solid loading of slurries (60–85 vol%) and sintering conditions (1280 °C for 1–6 h) significantly influenced the composition, microstructure, sintering, and mechanical behavior of fused ceramics. Increasing solid loading promoted densification, enhanced bulk density, and inhibited cristobalite precipitation. In contrast, extending holding time enhanced viscous flow and densification, but increased cristobalite precipitation. Therefore, both solid loading and holding time must be optimized to enhance material densification and suppress cristobalite precipitation. Fused silica ceramics prepared under 80 vol% solid loading and 3 h holding time showed optimal overall performance. They achieved a bulk density of 2.00 g/cm 3 , a flexural strength of 71.21 MPa, and a linear thermal expansion coefficient (approximately 10 −6 /°C) within the range from room temperature to 1000 °C. Following 20 thermal shock cycles between room temperature and 1000 °C, the material retained a residual flexural strength of 23.64 MPa, with a corresponding strength retention rate of 33.20 %. This study provides valuable guidance for fabricating high-strength fused silica ceramics via gelcasting and pressureless sintering.
研究领域:
陶瓷工程
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材料科学
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微观结构调控
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力学性能
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热震性能
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Minhua Su,Zequan Liu,Gutha Yuvaraja,Tao Ou,Ying Huang,Xiaoting Hu,Diyun Chen
Contamination caused by radionuclides such as uranium (U) has become an increasingly serious environmental problem. The unique and diverse features of uranyl ions (U(VI)) remarkably dominate their mobility and environmental impact on the ecosystem. Understanding the sorption behavior and fate of aqueous U(VI) ions on natural mineral(s) such as quartz sand (a typical type of crystalline silica (SiO 2 )) particles is essential for unraveling many environmental issues . In this work, the sorption of uranyl ions by various particle size quartz sands under different reaction conditions was thoroughly investigated. The quartz sand with an average particle size of 3.588 μm exhibited an excellent sorption performance for the removal of aqueous U(VI) ions at pH 5.0. The sorption rate increased as the dosage of sorbent increased. The sorption rate descends with the rise of the initial U(VI) concentration while its sorption amount is reversed. The elevation of temperature impeded the U(VI) sorption. Humic acid (a typical natural organic matter) showed significant impacts on U(VI) removal. Ions of Ca 2+ , CO 3 2− and K + remarkably inhibited the U(VI) sorption, while PO 4 3− ions significantly promoted the U(VI) sorption. The pseudo second-order kinetic model could fit well with the experimental sorption data. The U(VI) sorption is mainly chemisorption and it is an exothermic process. After sorption, the surface of used quartz sand became much smooth and XPS signals of U(VI) were detected, evidencing the success of the removal of aqueous U(VI). The outcomes of this study highlighted both solution pH and natural organic matters played critical roles on U(VI) removal by sand particles. This study further enhances our comprehension from the molecular-scale process manipulating U(VI) sorption behavior at the mineral-aqueous interface.
研究领域:
环境科学
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放射化学
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产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
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2021
·
IF 4.765
An Liu,Pan-pan Fan,Feng Han,Hua Han,Zhi-hong Li,Huai-fa Wang,Min-qiang Fan
In this study, the electroflotation of quartz and magnetite with cationic collector dodecylamine (DDA) and anionic collector sodium oleate (NaOL) were investigated to gain a better understanding of the electroflotation process and identify methods to improve it. An interesting phenomenon accompanied with obvious promotion (NaOL is used as collector) and inhibition (DDA-HCl is used as collector) of quartz flotation was observed after electrolysis. The obvious promotion arouse from the supply of the metal cations as active site for the adsorption of negatively charged group and increase active collecting species ionic forms RCOO - and (RCOO) 2 2– . Conversely, the obvious inhibition originated from the decrease of the active collecting species RNH 3 + and (RNH 3 ) 2 2+ . An obvious inhibition phenomenon was observed after the electrolysis for the magnetite. This is because the active collecting species RNH 3 + , (RNH 3 ) 2 2+ , RNH 2 ·RNH 3 + and RCOOH molecule decreased significantly after electrolysis. Furthermore, a comparison test between the regular flotation and electroflotation was conducted in the reverse flotation of magnetic separation concentrate. Compared with the regular flotation process, electroflotation flotation was characterized by simple reagent regime (without pH regulator and activator) and moderate conditions (natural pH), which had mild operation condition superiority. Moreover, the flotation product index of electroflotation can be better through slightly adjusting the reagent regime, and it can be certain that electroflotation is an effective process in the reverse flotation of magnetite. These findings provided a novel perspective for understanding the electroflotation process.
研究领域:
矿物加工工程
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浮选化学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2022
·Vol. 12
·期 9
·1068
·
IF 2.818
Yangshuai Qiu,Zhenfei Mao,Kangkang Sun,Lingyan Zhang,Yupeng Qian,Tao Lei,Wenbo Liang,Yaxin An
Flotation is one of the most used methods to upgrade natural graphite resources. However, the efficiency is usually decreased due to the entrainment of undesirable fine gangue minerals. In this work, the impact of different factors such as particle size, pulp density, and flotation reagent on the entrainment of mica and quartz in a flake graphite flotation was studied. The single gangue mineral flotation results showed increased gangue entrainment when reducing the particle size of gangue minerals and increasing the pulp density. Moreover, the flotation of artificial mixtures indicated enhanced entrainment of mica and quartz in the presence of graphite particles. The collector and frother also strongly affect gangue entrainment by modifying the structure and stability of the froth. Kerosene, which has a prominent deforming feature, can reduce gangue entrainment more effectively than diesel.Keywords:entrainment;froth flotation;quartz;mica;flake graphite
研究领域:
矿物加工
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材料科学
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产品关联
DOI
高影响因子
Journal of Hazardous Materials Letters
·
2023
·
IF 0
Ying Lyu,Baohua Wang,Mark L. Brusseau
The impact of chain length on the retention and transport of perfluorocarboxylic acids (PFCAs) in a quartz sand was investigated. Short-chain (C4–C7: PFBA, PFPeA, PFHxA, PFHpA) and long-chain (C8–C10: PFOA, PFNA, PFDA) PFCAs were selected as a representative homologous series. Miscible-displacement transport experiments were conducted under saturated conditions to characterize the magnitudes of sorption mediating retention and transport. Quantitative-structure/property-relationship (QSPR) analysis was applied to characterize the influence of molecular size on sorption. The transport of the long-chain PFCAs exhibited greater retardation than the short-chain PFCAs. The log of the equilibrium sorption coefficient ( K d ) exhibited a biphasic relationship with carbon number and molar volume, with the magnitude of measured sorption for the short-chain PFCAs significantly greater than would be predicted using the QSPR regression developed for the long-chain PFCAs. This is consistent with batch-measured data reported in the literature, and likely reflects the relative influence of different sorption mechanisms for the short-chain vs long-chain PFCAs.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xinyan Suo,Bowen Yu,Jinting Sha,Runbo Gao,Mengyao Qi,Yehao Huang,Weijun Peng,Xiao Guo,Wei Wang,Yijun Cao,Chongqing Wang,Yukun Huang
Amine ether was initially used as a novel collector for the direct flotation of quartz to separate the quartz from feldspar under weak alkaline conditions. The flotation results demonstrated that the recovery differences between quartz and feldspar both decreased with the increase in the carbon chain length and number of alkoxy groups of amine ether. A recovery difference of nearly 90 % could be achieved between them at a pulp pH of 8.0 with dodecylamine polyoxyethylene ether (AC1210) serving as the collector. The results of the mechanism analysis demonstrated that AC1210 was effectively adsorbed on the quartz surface via electrostatic interaction and hydrogen bonding. However, the electrostatic repulsion between the K + on the feldspar surface and positively charged NH + groups of AC1210 weakened the adsorption of AC1210 on the surface of feldspar. The difference in the adsorption capacity of AC1210 between the quartz and feldspar promoted the selective direct flotation of quartz from the mixture of quartz and feldspar.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jianlei Gao,Zixu Zhao,Yixin Yan,Mengyuan Feng,Yu Wang,Jing Wang
ABSTRACT Hexavalent chromium [Cr(VI)] pollution has attracted intense interest in research on heavy metal pollution removal. Here, quartz sand chitosan zero-valent iron (QS-CTS@ZVI) was prepared as a permeable reactive barrier (PRB) medium material by using PRB permeable reaction wall technology and modified CTS-loaded ZVI-coated quartz sand. Characterization analyses were performed with scanning electron microscope, X-ray diffraction, Fourier-transform infrared spectroscopy and thermogravimetry-differential scanning calorimetry. The effects of the reaction time, reaction temperature, initial solution pH, initial Cr(VI) concentration, adsorbent dosage, interfering ions and adsorption cycle on the adsorption of Cr(VI) and total Cr on QS-CTS@ZVI were examined. Then, the adsorption of Cr(VI) by QS-CTS@ZVI was investigated. The results showed that for a ZVI:CTS ratio of 1:1 (m:m), a QS:ZVI ratio of 1:2 (m:m), a pH of 3, t = 5 h, an initial Cr(VI) concentration of 200 mg/L, a QS-CTS@ZVI dosage of 3.5 g/L, and T = 25°C, the efficiencies of Cr(VI) and total Cr removal by QS-CTS@ZVI were 91.6% and 90.9%, respectively. The adsorption efficiency of QS-CTS@ZVI for Cr(VI) was approximately 80% after three reuses. The coexistence of SO 4 2- in water can significantly inhibit the Cr(VI) adsorption and removal process. The process of adsorption of Cr(VI) by QS-CTS@ZVI conformed to the pseudo-second-order kinetic equation and the Langmuir adsorption isotherm model.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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