JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2024
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IF 5.9
Chen Li,Chuncai Zhou,Wenwen Li,Wenrui Zhu,Jiaqian Shi,Lei Wu,Guijian Liu
Coal fly ash (CFA) is a promising alternative source for critical elements. Most of the critical elements in CFA are associated with the aluminosilicate glassy phase , which hinders their ability to solubilize during acid leaching. In this study, critical elements (Li, Be, Rb, Sr, Zr, Nb, Cs, Hf, Ta, Ga, Ge, Se, Cd, and Tl) were recovered from CFA of Pingwei power plant in China by alkali fusion-organic acid leaching. The results showed that the leaching rate of critical elements after alkali fusion was higher than that of direct organic acid leaching. The leaching rate of total critical elements was 72.56% under the optimal conditions. Among them, the highest leaching rate of Li, Be and Ga was more than 90%, and the highest leaching rate of Ge, Se, Rb, Sr, Zr, Nb, Cd, Cs and Hf was 70%-90%. Characterization analysis revealed that the amorphous aluminosilicate and silica phases in the raw CFA were destroyed by alkali fusion, resulting in nepheline and soluble aluminosilicate phases which were easily dissolved by citric acid . This study provides theoretical basis and technical support for the extraction of critical elements from CFA.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2024
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IF 5.9
Yinhai Pan,Du Wei,Shuo Yao,Haijun Zhang,Quanzhi Tian
Coal gasification slag (CGS) is rich in Li and Ga. However, few studies have focused on the extraction of Li and Ga from CGS. In the present study, the leaching of Li and Ga from CGS calcined with the alkali reagents including NaOH, KOH, Na 2 O 2 , Na 2 CO 3 and K 2 CO 3 were studied through water leaching and solid characterizations including XRD, TG-DSC and NMR. The best leaching percentages of Li and Ga from NaOH-, KOH-, Na 2 O 2 -, Na 2 CO 3 - and K 2 CO 3 -roasted products were 40.81% and 47.89%, 41.19% and 31.60%, 28.04% and 52.40%, 28.21% and 48.58%, and 34.29% and 38.61%, respectively, showing Li and Ga are difficult to be leached out. It has been proven that the formation of insoluble crystal substances (such as NaAlSiO 4 ) in alkali fusion products inhibits the leaching of Li and Ga. In addition, Li and Ga can be released from the insoluble crystal substances due to Na 2 SiO 3 in alkali fusion products can promote the dissolution of insoluble crystal substances into SiO 4 and AlO 4 species, which can improve the leaching of Li and Ga. However, part of the released Li and Ga are stabled in the structure of amorphous substances generated by SiO 4 and AlO 4 species in the form of isomorphism, reducing the leaching of Li and Ga. Thus, this work would provide guidance for the leaching of Li and Ga from CGS.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
Tungsten
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2025
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IF 11.2
Zhao Jian-Ying,Mu Pan-Pan,Liu Hao,Chachina Svetlana B.,Zhang Xiao-Guang,Zhang Shao-Gang,Pan Dean
Waste fluidized catalytic cracking (FCC) catalysts contain strategic metals with high recycling value, and effective treatment of these waste catalysts is crucial for resource recovery and environmental protection. In this study, a leaching process of “oxidation treatment–alkali roasting–wet mill leaching” was proposed for the extraction of tungsten (W) and molybdenum (Mo) valuable metals from spent FCC catalysts, and a technological pathway suitable for industrial production was explored through a detailed investigation of the conversion mechanism and process optimization. After the pretreatment by oxidation and roasting at 600 ℃ for 4 h, the optimal conditions for alkali roasting were found to be 950 ℃ with the addition of three times the theoretical amount of alkali (Na 2 CO 3 ), which ensured full conversion and avoided the generation of impurities. Through one-factor exploration and response surface optimization, the average leaching rate for W and Mo reached 87.23% and 99.50%, respectively, under the wet mill leaching conditions of a 200-mesh particle size, liquid–solid ratio of 2.79, a wet milling time of 1.18 h, a pellet ratio of 6.44:1, and a roasting time of 114.61 min. It was observed that both heating leaching and wet mill leaching could achieve full extraction with a relatively small liquid–solid ratio, thereby minimizing the production and discharge of waste liquid. The formation of nickel tungstate (NiWO 4 ) was identified as the main factor limiting the leaching of W, and it was found that increasing the oxygen content during the roasting process could improve the leaching efficiency. This study provides practical guidance and a scientific basis for the environmentally friendly and resource-efficient utilization of spent FCC catalysts.
研究领域:
冶金工程
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环境科学
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资源回收
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zhentao Zhou,Shuchen Sun,Ganfeng Tu,Ziyan Yang,Faxin Xiao,Chengfu Sui,Kuopei Yu
With global demand for high performance materials continues to rise, the significance of beryllium as a critical material will become increasingly pronounced, making the stability of its resource supply a pressing concern. How to efficiently develop low-grade beryllium ore has become a key challenge for beryllium resource management. This study proposes an alkaline melting enhancement process to facilitate the efficient leaching of beryllium from low-grade beryllium ore. Experimental results demonstrate that the direct sulfuric acid curing leaching of beryl yields suboptimal results, with a maximum leaching efficiency of 33.5 %. At 1500 °C, Al 2 Be 3 Si 6 O 18 decomposes into Be 2 SiO 4 , Al 2 BeO 4 , and SiO 2 , resulting in a leaching efficiency increase to 61.67 %. Inadequate CaO addition during the alkaline melting process results in the formation of SiO 2 -Al 2 O 3 -CaO, SiO 2 , and partial BeO, while the remaining Be is included in the glass phase. The optimal conditions for the alkaline melting of beryl are 1300 °C for 2 h with a 35 % CaO addition. Under these conditions, the leaching efficiency of Be can reach 97.02 %. This method enables the efficient extraction of Be from low-grade beryllium ore, providing both theoretical support and technical guidance for the sustainable development and efficient utilization of beryllium resources.
研究领域:
材料科学
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矿物工程
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Mei Guo,Xiangchao Chen,Xin Zhang,Qidong Dang,Chaochao Qiu,Yaqun Wang,Guoxin Zhang
Carbide-derived carbons (CDC) represent a kind of typical and fascinating porous carbon materials (PCM) for broad applications but demand hazardous chlorine to fulfil the conversion into carbon. Here in this study, we report the facile fabrication of PCM with rich porosity from mild molten alkaline-treated calcium carbide (CaC 2 ). Resulted PCM under optimized synthesis conditions exhibited large specific surface area (∼839 m 2 g −1 ) and specific capacitance (403 F g −1 at current density of 0.5 A g −1 ). Meanwhile, fairly good rate capability of retaining over 63% capacitance at large current density of 5 A g −1 , and robust cycling performance (∼5% fading after 5000 cycles at high rate of 5 A g −1 ) can be also obtainable. Our study rendered a simple but effective method to utilize CaC 2 as carbon source and may have broad applications such as adsorbents, anode materials for Li/Na-ion batteries.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
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2023
·Vol. 38
·期 10
·1934-1942
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IF 3.4
Yue Cai,Ting Ruan,Ye Li,Baichan Li,Weiwei Zhang,Zhenghui Li,Haizhen Wei,E. Troy Rasbury
Boron (B) is one of the most powerful tracers of fluid-mediated processes. However, challenges still exist for B analysis of silicate materials with the main difficulty in sample dissolution. Cai et al. (2021) reported a novel alkaline fusion method for boron isotope analysis using solid sodium peroxide and glassy carbon crucibles. Here we report a modified and improved version of this method using hydrated sodium peroxide and silver crucibles, which permits a lower flux-to-sample mass ratio (FSMR) (3 : 1), relatively low fusion temperature of 710 °C, and the use of cheaper silver crucibles. This modified method achieves complete sample dissolution while being safer and more efficient as it removes the need for grinding fresh sodium peroxide solid into powder. The B blank of the hydrated sodium peroxide solution can be determined more accurately and further reduced through chromatography. In addition to the improvements in the alkaline fusion procedure, we also propose a new procedure to dissolve the fusion cake, which greatly reduces reagent usage and minimizes the procedural blank as a result. Using these improved techniques, we analyzed B concentrations and B isotope compositions of eight silicate international standards. The results are consistent with published data within analytical uncertainties. Combined with the one-step chromatography using the Amberlite® IRA-743 B-specific resin to purify B and the Neptune plus® MC-ICP-MS for isotopic analysis, this method generates a batch of B concentration and isotope data within 48 hours with minimal need to handle hazardous chemicals. This safe and efficient method will greatly speed up research using B isotopes on silicate materials.
研究领域:
地球化学
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分析化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Huawei Zhuo,Wenjie Cao,Xueli Mei,Yu Liu,Bo Chen,Baoyong Cao,Yizhao Li
The continuous surge in global electricity demand has led to a substantial generation and accumulation of fly ash (FA), with existing resource utilization technologies demonstrating low efficiency and low value-added productions. This limitation impedes FA recycling and poses environmental pollution risks. In this study, an efficient and easily implemented cascaded process including alkali fusion, acid leaching, sol-gel and gel-washing was introduced. Results showed that this method can simultaneously synthesize high-purity silica aerogel particles (SAP, with SiO 2 content of 99.01 %) and nano-alumina particles (NAP, with Al 2 O 3 content of 98.34 %), and the silicon extraction efficiency can reach approximately 93 %. Furthermore, the systematic evaluation of SAP and NAP as dual-functional additives revealed their enhancing effect on the thermal insulation and flame-retardant properties of composite aerogels. This research proposes a novel pathway for high-value FA utilization. It also establishes a technical framework for cost-effective SAP and NAP preparation, potentially advancing sustainable development in related industries.
研究领域:
材料科学
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环境工程
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化学工程
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纳米技术
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能源技术
✓ 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）