CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
An-Nan Chen,Jia-Min Wu,Huan Xiao,Jing-Yan Chen,Xiao-Yan Zhang,Fen Chen,Yi-Xin Ma,Chen-Hui Li,Qing-Song Wei,Yu-Sheng Shi
A novel rapid, uniform and non-contamination in-situ solidification method for alumina suspension by DCC-HVCI method using MgO sintering additive as coagulating agent was reported. MgO was used to release Mg 2+ in suspensions via reaction with acetic acid generated from glycerol diacetate (GDA) at elevated temperature as well as to improve density and suppress grain growth of alumina ceramics during sintering. Influence of adding 0.7 wt% MgO with 2.0 vol% GDA in alumina suspension on coagulation process and properties of green bodies and sintered samples were investigated. It was indicated that the controlled coagulation of the suspension could be achieved after treating at 70 °C for 10 min. Homogeneous composition distribution of Mg element in EDS result indicated the uniform solidification of suspensions. Compressive strength of wet-coagulated bodies is 2.09±0.25 MPa. Dense alumina ceramics with relative density of 99.2% and flexural strength of 354±16 MPa sintered at 1650 °C for 4 h present homogeneous microstructure. The result indicated that the novel DCC-HVCI method via a sintering additive reaction with no contamination, short coagulation time and uniform in-situ solidification is a promising colloidal forming method for preparing high-performance ceramic components with complex shape.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Silan Zhao,Lifang Gong,Guangzhao Guo,Huimin Liu,Shuai Li,Lu Dong,Shuang Deng,Hongyun Hu
A large number of fly ash samples from mechanical grate furnaces at a municipal solid waste incineration (MSWI) plant were examined including Se speciation and content. Se leaching behaviors before and after solidification/stabilization(S/S) treatment were comparatively studied. The results showed that Se in the MSWI fly ash was present mainly in the form of selenite with small amounts of physically adsorbed SeO 2 (s). Se in the low alkalinity ash (pH ∼ 7) tended to be more leachable than that in the high alkalinity ash (pH ∼ 12). The chelation treatment would further raise the risk of Se leaching into the environment from the low alkalinity ash (pH ∼ 7). Three Fe-containing additives (zero-valent iron (ZVI)、α-Fe 2 O 3 and Fe 3 O 4 ) were introduced, respectively in attempt to immobilize Se in the low alkalinity MSWI fly ash. A strong positive effect was found with ZVI addition in terms of Se leaching from low alkalinity chelated MSWI ash. Comparatively, iron oxides showed no obvious effect. The adjustment to ash alkalinity (CaO addition) exhibited a comparable effect to ZVI addition, which provided another option to control Se leaching from low alkalinity chelated ash.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wanting Zou,Wenhua Zhang,Yilin Pi,Yunsheng Zhang,Lei Zhang,Yuan Chen
Using tailings as material to prepare glass-ceramic is an excellent way to achieve the resource utilization of solid waste. However, at present, researches on the solidification and migration of heavy metals are limited. Therefore, in this study, ten groups of samples were prepared by controlling sintering temperatures . The solidification, migration, and leaching behavior of non-volatile and volatile heavy metals were studied. The research showed that, with the increase of temperature, the properties of the samples were improved. Fe participated in the phase transformation and evolved into insoluble iron pyroxenes solid solution, while Pb was homogeneously distributed in the glass matrix of glass-ceramics. The leaching concentrations of Fe and Pb in the glass-ceramics were 0.055 mg/L ∼0.087 mg/L and 0.074 mg/L ∼0.140 mg/L, which were far below the threshold value. The results showed that heavy metals can be effectively solidified in glass-ceramics and have good environmental benefits.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Guo-qing Li,Yue Zhao,Yan Zhou,Xiao-hui Ning
Liquid metal battery (LMB) is a promising candidate for grid energy storage due to its long cycle life, low cost and easy scale-up. However, it has some drawbacks like low cell voltage and high operating temperature. In this work, we used the solid lithium titanate (Li 4 Ti 5 O 12 ) instead of the liquid alloy as the cathode to promote the cell voltage and decrease the operating temperature. This liquid-solid metal battery was able to work at 350 °C by applying liquid lithium as anode, Li 4 Ti 5 O 12 -based material as cathode and LiCl-LiBr-KBr molten salt as electrolyte. The acquired Li | LiCl-LiBr-KBr | Li 4 Ti 5 O 12 @C Cu battery cycled at 1 C rate (3.61 mA cm −2 ) for over 100 cycles with 0.02% capacity decay per cycle. An overall energy efficiency of 80%, coulombic efficiency of 96%, 1.2 V discharge voltage and cathode utilization of 82% were obtained. Furthermore, the effects of the electronic conductivity of Li 4 Ti 5 O 12 -based materials, temperature and current density on the electrochemical performance of the cell were investigated.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jirong Lan,Yan Sun,Hong Tian,Wei Zhan,Yaguang Du,Hengpeng Ye,Dongyun Du,Tian C. Zhang,Haobo Hou
Slag backfilling with electrolytic manganese residue (EMR) is an economical and environmentally-friendly method. However, high ammonium-nitrogen and manganese ions in EMRs limit this practice. In this study, a method of highly efficient simultaneous stabilization/solidification of ultrafine EMR by making EMR-based cementitious material (named EMR-P) was proposed and tested via single-factor and response surface optimization experiments. Results show that the stabilization efficiency of NH 4 + and Mn 2+ were above 95%, and the unconfined compressive strength of the EMR-P was 18.85 MPa (megapascal = N/mm 2 ). The mechanistic study concluded that the soluble manganese sulfate and ammonium sulfate in EMR were converted into the insoluble precipitates of manganite (MnOOH), gypsum (CaSO 4 ), MnNH 4 PO 4 ·H 2 O, and struvite (MgNH 4 PO 4 ∙6 H 2 O), leading to the stabilization of NH 4 + and Mn 2+ in the EMR-P. Leaching tests of EMR-P indicated that NH 4 + , Mn 2+ , and others heavy metals in the leachate were within the permitted level of the GB/T8978-1996. The novelty of this study includes the addition of phosphate and magnesium ions to precipitate ammonium-nitrogen and the combination between calcium ions (from CaHPO 4 ∙2 H 2 O) and sulfate (from the EMR) to form calcium sulfate to improve the stability and unconfined compressive strength of cementitious materials (EMR-P).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Chenwei Liu,Chongrui Zhang,Chenru Zhou,Yongfei Mi,Zhiyuan Wang
The presence of unconverted water drops in bulk hydrocarbon is likely to bridge hydrate particles and cause hydrate agglomeration, leading to hydrate accumulation or bedding in oil and gas pipelines. The knowledge of the interaction forces between hydrate particles and water drops can provide critical insights into hydrate agglomeration as well as potential prevention strategies. At high subcooling, the frequent solidification of the capillary bridge between hydrate particles could significantly affect the interaction force. However, the existing classic pendular liquid bridge model with a fixed liquid volume is not adequate for this unique case. A new interaction force model is required. Based on the pendular liquid bridge model and hydrate shell theory, a modified interaction force model was developed by considering the solidification of capillary bridges. Furthermore, using a self-built micromechanical force apparatus, the cyclopentane (CyC5) hydrate–droplet adhesion forces at a temperature range from 0.5 to 6 °C were measured to verify the proposed model. The experiments suggest that as the temperature was increased from 0.5 to 6 °C, the adhesion forces first increased and then decreased. Solidification could enhance the strength of the already formed liquid bridge. However, at lower temperatures (0.5–3 °C), the quick solidification led to smaller particle/bridge initial contact areas and weaker adhesion forces. By accurately predicting the evolution of the capillary bridge shape/outline, the predicted adhesion forces agree well with the experimental measurements. This study can provide more insights into hydrate agglomeration. The proposed model is an important supplement to hydrate adhesion theory and could more accurately evaluate hydrate plug risks in gas–oil flowlines.
研究领域:
石油工程
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化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Fangzhu Xiao,Tao Huang,Shuwen Zhang,Longfei Liu,Cheng Wang,Guowen Peng,Shuya He
The fallout of the radioactive nuclide cesium (Cs) has posed its potential environmental threat to human health and ecosystem during the Fukushima accident. Thus, Cs decontamination from radioactive wastewater is strongly required for treating similar occurrences. In this work, a coupling method was applied to achieve Cs + removal and solidification in one conducting system. Ammonium molybdophosphate (AMP) was loaded to blast furnace slag (BFS) particles for the preparation of adsorbent (BFS-AMP) and binder. The maximum adsorption capacity of BFS-AMP for Cs + was 23.36 mg/g obtaining at the pH of 8 and the initial concentration of 500 mg/L in the equilibrium adsorption experiments. Cs + uptake confirmed to the pseudo-first-order kinetic model . Electrokinetics (EK) not only increased the adsorption capacity of BFS-AMP also enhanced the migration of Cs + ions from the anode to cathode in the electrolyzer . The transfer of Cs + ions from liquid to solid in the electrolyzer was controlled by both voltage gradients and flow rates. The solidification of EK-treated BFS-AMP mortar was mainly dominated by the mass ratios (wt.%) of alkali activator to adsorbent and the initial pH values. Cs + leaching from the solidified products of EK-treated BFS-AMP mortars ranged from approximately 1.18 × 10 −7 to 9.54 × 10 −6 g cm −2 ∙d −1 . The electromigration , geopolymer stabilization, and hydration encapsulation were concluded as the main incorporation mechanisms for Cs + ions transferring from the stock solution into the BFS-AMP-based solidification in the electrolyzer.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Xiaohui Sun,Ziyi Chen,Keyu Guo,Jianbo Fei,Zijun Dong,Hao Xiong
Geopolymeric flocculation-solidification of the tail slurry of shield tunnelling spoil after sand separation was investigated to replace the low-efficient flocculation and filter-pressing method currently adopted on site. The geopolymeric flocculation-solidification agent (GBFS-FS) consisting of flocculation component and geopolymeric solidification component (granulated blast-furnace slag (GBFS) activated by alkali) was prepared and investigated through flocculation-sedimentation test, dewatering model test, unconfined compression test, SEM test, etc. In the flocculation-sedimentation test, the GBFS-FS agent demonstrated the best flocculation effect as compared with other cementitious flocculation-solidification agents. The dewatering model tests revealed that adding the GBFS-FS agent into the slurry can not only dewater the slurry efficiently, but also generate solidified clayey sediments with quickly-increased strength. The solidified clayey sediments with GBFS-FS showed strengths 3.5 times higher than others with cementitious agents at a 28-day curing age. The GBFS-FS agent can also facilitate to make controlled low-strength material (CLSM) using the tail slurry. The fluidity and strength of CLSM with GBFS-FS were distinctly better than those of other groups. SEM test shows that the components of the GBFS-FS agent can interact to avoid large flocs and support each other in strength growth.
研究领域:
土木工程
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Shiwei Liu,Xing Cao,Weichen Yang,Runjie Liu,Lin Fang,Rui Ma,Juan Peng,Shuaifei Zheng,Fei Ji
Higher chlorine (Cl) content than lead (Pb) content in municipal solid waste incineration fly ash (MSWIFA) impeded the practical application of Pb 5 (PO 4 ) 3 Cl-derived magnesium potassium phosphate cement (MKPC) preparation strategy. Herein, Pb/Ca-rich lead slag (LS) was co-blended with MSWIFA to prepare MKPC for the synergistic treatment of both two solid wastes and the Pb-Cl solidification. The results showed that the resulting 15–15 (15 wt% MSWIFA and 15 wt% LS incorporation) sample achieved 25.44 MPa compressive strength , and Pb and Cl leaching toxicity was reduced by 99.18 % and 92.80 %, respectively. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses showed that Pb 2+ , Ca 2+ , phosphate and Cl - formed Pb x Ca 5−x (PO 4 ) 3 Cl in samples. The formation of Pb x Ca 5−x (PO 4 ) 3 Cl was also demonstrated by the high-angle annular dark field scanning transmission electron microscope (HAADF-STEM), while differences in the lattice characteristics of Pb x Ca 5−x (PO 4 ) 3 Cl and Pb 5 (PO 4 ) 3 Cl were found. In-situ XRD indicated that Ca 2+ accelerated the transformation of Pb 2+ to Pb 5 (PO 4 ) 3 Cl. After co-precipitating with Ca 2+ to form Pb x Ca 5−x (PO 4 ) 3 Cl, Pb 2+ continuously substituted Ca 2+ to eventually transform to Pb 5 (PO 4 ) 3 Cl. This work informs the synergistic treatment of MSWIFA and LS and offers new insights into the reaction mechanism between Pb 2+ , phosphate and Cl - under Ca 2+ induction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TOXICOLOGY IN VITRO
·
2018
·
IF 3.105
Lu Zhang,Xiao Yan Zhang,Yulan Hu,Bing Jian Zhang
Temporary consolidants, such as cyclododecane, menthol, coumarin , and ethyl maltol , are proved to be effective for urgent conservation in archaeological field. However, the safety of these temporary consolidants is still unknown although they are always heavily used in archaeological field. Thus reports on the toxicity of these temporary consolidants are limited. Here, a zebrafish model was used for safety evaluation of these four temporary consolidants. In the present study, four temporary consolidants, including cyclododecane, menthol, coumarin, and ethyl maltol, at different concentrations were incubated with zebrafish embryos, and their biological toxic effects were firstly evaluated. It was shown that embryo exposure to temporary consolidants resulted in an increased mortality and malformation rate, and a decreased hatching rate. The order of embryo toxicity of the four types of temporary consolidants tested was menthol > coumarin > ethyl maltol > cyclododecane. Although the embryo toxicity of cyclododecane was minimal, some studies have indicated that this temporary consolidant could be bioaccumulated. The results also suggested that the zebrafish embryos can serve as a reliable model for the evaluation of embryo toxicity of temporary consolidants, as this model could offer the possibility to perform the rapid, medium throughput, cost-effective analyses.
研究领域:
考古学
·
毒理学
·
环境科学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Yanyun Zhao,Di Zhang,Xiangming Hu,Yue Feng,Jindi Liu,Xiaoniu Yu,Ningjun Jiang
Dust suppression agent based on Microbially Induced Carbonate Precipitation (MICP) was a new and efficient dust suppression method in recent years, but the environment had a significant impact on its dust suppression effect, and its mechanism of action was complex. This article conducted a dust suppression study by adjusting the volume ratio of bacterial solution and cementation solution in MICP. It was found that the dust suppression efficiency was the highest when the bacterial solution to cementation solution ratio was 2:1, and the wind erosion rate in 15 days was 0.68 %. In the early stage, the nutrients in the bacterial solution bound the coal dust to suppress the dust, but the dominant factor for the continuous performance of the subsequent dust suppression was the deposition and adhesion of CaCO 3 formed by biomineralization. As the reaction progressed, the CaCO 3 crystal form gradually changed from the initial vaterite to calcite. When the proportion of bacterial solution was high, it promoted the convert of crystal form and stabilized the cementation. However, at low bacterial solution proportions, the transformation time of vaterite to calcite was prolonged and the proportion of calcite decreased. The microbial dust suppressant with a high bacterial solution to cementation solution ratio had poor infiltration, causing it to concentrate on the surface of coal dust, resulting in high hardness of the mineralized coal dust consolidation body. At low Bacterial solution to cementation solution ratio, the wettability of the microbial dust suppressant increased, leading to a more uniform consolidation and increased thickness.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Yawen Zhao,Na Zhang,Xuemei Chen
In this paper, the municipal solid waste incineration bottom ash (MSW-IBA) is used as the fine aggregate and firming agent component of the premixed fluid stabilized soil (PFSS). Through the mechanical strength test, and the hydration products and microstructure characterization, the effects of the NaOH content for MSW-IBA pre-aging treatment and activator content on the mechanical properties of the PFSS are studied. The results show that the mechanical strength of the prepared PFSS is closely related to the amount of NaOH and the activator. The increase in the amount of NaOH and activator can affect the formation of early hydration product Aft, and reduce the early strength. However, it can promote the depolymerization of glass phase in MSW-IBA and slag to form C-(A)-S-H and Mg-(A)-S-H gel, increase the microstructure density, and thus improve the late strength. The application of MSW-IBA in PFSS can achieve the recycling of solid waste.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）