Materials
·
2023
·Vol. 16
·期 21
·6900
·
IF 3.4
Qi Wang,Minghao Fang,Xin Min,Pengpeng Du,Zhaohui Huang,Yangai Liu,Xiaowen Wu,Yulin Liu,Changmiao Liu,Feihui Huang
In recent years, regenerative thermal oxidizer (RTO) has been widely used in the petroleum industry, chemical industry, etc. The massive storage required by solid waste has become a serious problem. Due to their chemical composition, bauxite tailings as raw materials for high-temperature thermal storage ceramics show enormous potential in the fields of research and application. In this study, we propose a method for preparing ferric-rich and high specific storage capacity by adding Fe2O3powder to bauxite tailings. Based on a 7:3 mass ratio of bauxite tailings to lepidolite, Fe2O3powder with different mass fractions (7 wt%, 15 wt%, 20 wt%, 30 wt%, and 40 wt%) was added to the ceramic material to improve the physical properties and thermal storage capacity of thermal storage ceramics. The results showed that ferric-rich thermal storage ceramics with optimal performance were obtained by holding them at a sintering temperature of 1000 °C for 2 h. When the Fe2O3content was 15 wt%, the bulk density of the thermal storage ceramic reached 2.53 g/cm3, the compressive strength was 120.81 MPa, and the specific heat capacity was 1.06 J/(g·K). This study has practical guidance significance in the preparation of high thermal storage ceramics at low temperatures and low costs.Keywords:bauxite tailings;thermal storage ceramic;specific heat capacity;bulk density;RTO
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·Vol. 45
·期 3
·3710-3714
·
IF 3.057
Yue Hu,Zhen Xiao,Huanping Wang,Can Ye,Yuqian Wu,Shiqing Xu
Porous CaSiO 3 ceramics were prepared via a solid-state reaction method using CaCO 3 and SiO 2 as raw materials and active carbon as a pore-forming agent. The results indicated that porous CaSiO 3 ceramics could be obtained under a low sintering temperature of 1320 °C. The addition of active carbon significantly affected the volume density, microstructure, pore size distribution and mechanical strength of porous CaSiO 3 ceramics. With the increase of active carbon content, the volume density decreased, meanwhile the pore size and porosity increased gradually. Besides, the three-point bending tests demonstrated that the mechanical strength was decreased with increasing active carbon content. However, all the porous ceramics still exhibited high mechanical strength. These results implied that the increase of active carbon content not only enlarged the pore size and enhanced the porosity, but also kept a remarkable mechanical strength of porous CaSiO 3 ceramics. Therefore, these rationally designed CaSiO 3 porous ceramics will be a highly potential material in various applications due to its high mechanical strength, low sintering temperature and narrow pore size distribution.
研究领域:
材料科学
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生物陶瓷
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组织工程
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生物医学材料
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无机非金属材料
✓ 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
Materials Today Communications
·
2023
·
IF 3.8
Xinwei Geng,Yongfeng Xia,Hanqin Liang,Dongxu Yao,Yu-Ping Zeng
Magnéli phase ceramics have gained extensive attention in a variety of fields, including batteries, electrocatalysis , and wastewater treatment, due to their distinctive properties. In this study, high-performance Magnéli phase Ti 4 O 7 ceramics were synthesized by in-situ hot-pressed sintering of titanium (Ti) and titanium dioxide (TiO 2 ) in a single step. The effects of the sintering temperature and Ti content on the phase transformation and morphology of ceramics were investigated. Moreover, the mechanical properties and electrical conductivity of the samples were systematically characterized. Results show that the sample with the Ti/TiO 2 weight ratio of 0.09 sintered at 1000 °C has impressive comprehensive properties, including a high bulk density of 4.281 g·cm −1 , a mean value of flexural strength of 125.58 MPa, and an excellent conductivity of 1129 S·cm −1 . Furthermore, an evolution mechanism of the in-situ sintering for Ti/TiO 2 was discussed based on the experimental data, and the pattern of variation observed by samples can be reasonably explained.
研究领域:
材料科学
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陶瓷
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电化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Rui Wang,Xianjie Liu,Haichao Wei,Yanheng Xu,Ruxian Zhou,Zhaohui Huang,Huasheng Zhan,Shulong Ma,Chen Yang
In this work, high temperature resistant materials based on waste electrical porcelain were prepared successfully by pressureless sintering method using waste electrical porcelain with different particle sizes, flint clay and dolomite as raw materials. Effects of sintering temperature and different amounts of flint clay on the properties of the prepared high temperature resistant materials were investigated. The analysis of XRD suggested that the temperature promoted the calcium aluminum silicate → gehlenite → anorthite phases transformation, which can also be proved from SEM images. The mechanical properties and volume stability of materials were improved by the formation of a large amount of interwoven plate-like anorthite. Besides, excessive sintering temperature (1300 °C) had adverse effects on microstructure and mechanical properties . The appropriate amount of flint clay additions led to more plate-like anorthite productions. With 30 wt% addition of flint clay, the sample exhibited the optimum comprehensive performance after sintering at 1250 °C showing the highest flexural and compressive strengths of 32.83 MPa and 89.59 MPa. The bulk density and apparent porosity of samples were 2.21 g/cm 3 and 3.27%, respectively. This study provides an experimental basis for the large-scale high-value utilization and recycling of waste electric porcelain.
研究领域:
材料科学
·
环境工程
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jie Jia,Xixi Zhang,Xin Jia,Jiayi Duan,Ziyan Wu,Xiaofan Deng,Junlin Ge
In this study, we investigated the protein structures, powder characteristics, as well as rehydration and emulsifying properties of spray-dried egg yolk powder after short-time lactic acid fermentation (3.5 h). Results indicate that fermentation improved the rehydration and emulsifying properties of yolk powder. Limosilactobacillus reuteri -fermented yolk powder exhibited better wettability due to the porous structure of particles and higher hydrophilicity. Lacticaseibacillus rhamnosus -fermented yolk powder had an enhanced coefficient of stability due to its smaller particles and higher surface charge. The higher water solubility of fermented yolk powder samples is mainly attributed to their lower hydrophobicity and higher zeta potential. The enhanced emulsifying activity of fermented yolk powder samples is primarily related to their increased β-turn structure and better solubility. Furthermore, fermentation treatment altered powder moisture content and bulk densities, while not affecting its flow behavior and thermal stability. This study provides an effective approach to improving the quality of yolk powder.
研究领域:
食品科学
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生物技术
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Sijia Yin,Tisong Liang,Shunshan Jiao,Pu Jing
Micronization affects physicochemical and functional properties of materials and hence might improve the quality of rice bran, following stabilization treatments. The micronization effects of stabilized rice bran via extrusion or radio frequency treatments on their morphology and functional properties, and releasable capability were investigated. Micronization reduced particle size, water binding capacity and swelling capacity of rice bran, and increased their whiteness, water solubility index, and nutrient releasability. However, no significant changes in oil binding capacity and thermal index after micronization were observed. Moreover, micronization could decrease the bulk density of rice bran stabilized by extrusion. The releasability of phenolics, flavonoids, γ-oryzanol, and minerals (K, Mg, Zn and Fe) from rice bran after micronization was improved based on in vitro digestion models. These findings suggested that micronization of rice bran following stabilization, especially extrusion treatment, could improve its functional and nutritional properties. The types of stabilization processing of rice bran, followed by micronization, should be considered practically for functional and nutritional properties.
研究领域:
食品科学
·
营养学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Fuxing Zhao,Jundong Zhu,Tangping Peng,Hao Liu,Shengzhuo Ge,Huasheng Xie,Le Xie,Chongwen Jiang
Excellent thermal insulating aerogels have broad application prospects in pipeline transportation, aerospace, construction and other fields. However, defects in thermal stability and mechanical are the main factors limiting their use to special environments. In this work, a novel polyimide composite aerogel is successfully synthesized through 3-Aminopropyltriethoxysilane (APTES) functionalized clay halloysite nanotubes (FHal) as inorganic enhancement phase and uniformly embedded in polyimide (PI) aerogels. Functionalization can increase the interfacial compatibility between clay inorganic phase and polyimide acid. The results indicated that FHal with high aspect ratio interacts with PI to form a three-dimensional network structure. The FHal/PI composite aerogels had low shrinkage (21.9%–30.79%), low bulk densities (65.285–71.464 mg/cm 3 ), low thermal conductivities (39.18–42.57 mW/(m·K)), high thermal stability (onset of decomposition above 520 °C) and excellent mechanical property (1.14 MPa, 2.62 times of pure PI aerogel). Therefore, FHal/PI composite aerogels can be used as a promising thermal management material for practical and complex insulation applications.
研究领域:
材料科学
·
化学工程
·
热管理
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）