Article
Engineering, Chemical
Xiang Li, Baozhong Ma, Chengyan Wang, Yongqiang Chen, Weijiao Yang, Wenjuan Zhang
Summary: In this study, an efficient and applicable approach was developed to selectively recover aluminum from high-alumina coal fly ash (HACFA), while simultaneously achieving the recovery and removal of most iron. This method provides a feasible way for the recovery and utilization of valuable components in HACFA.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Pengcheng Hu, Yimin Zhang
Summary: This study investigated the separation mechanism of iron impurity in the process of vanadium extraction from shale. By using oxalic acid to separate vanadium and iron, a high-purity FeC2O4.2H2O product can be obtained.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Shuai Yuan, Yong-hong Qin, Yong-peng Jin, Yan-jun LI
Summary: An innovative suspension roasting-leaching technology in the atmosphere has been proposed to improve vanadium extraction from refractory stone coal. The technology achieved a vanadium leaching rate of 47.14% at a roasting temperature of 800 degrees C, a roasting time of 20 min, and a gas flow rate of 400 mL/min, compared to a previous rate of 20%. The surface of the stone coal became rough and irregular during the suspension roasting process, increasing the specific surface area of the particles and destroying the lamellar structure of silicate minerals, resulting in the release of vanadium. Additionally, the vanadium in the stone coal was oxidized to V(V) or V(IV). The results indicate that the improved leaching rate is attributed to the release and transformation of vanadium during suspension roasting.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Mining & Mineral Processing
Hui Li, Yuexin Han, Jianping Jin, Peng Gao, Zhenya Zhou
Summary: The purpose of this study is to use process mineralogy as a practical tool to investigate the causes of low leaching rates in the curing-leaching process of vanadium-bearing stone coal and propose solutions or improvements to optimize the leaching index. By analyzing the effects of particle size, mineral composition, and sulfuric acid curing on different stages of the curing-leaching process, it was found that thorough washing after sieving and optimizing the curing process are necessary for improving the leaching rate. The analysis and detection of key products are helpful for identifying problems and enhancing the curing-leaching circuit process.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lucie Bartonova, Helena Raclavska, Jan Najser
Summary: This paper evaluates the important aspects of V in coal and its behavior during combustion, with a focus on its extraction from ash and slag waste. It also evaluates the co-combustion of coal and waste fuels and their corresponding ash and slag counterparts. The paper summarizes V levels in coal and other materials, discusses V speciation in ash and slag residues, and compares theoretical predictions with experimental results. It also discusses oxy-fuel combustion conditions and separation methods for extracting V from ash and slag residues. The paper concludes with remarks on promising trends and limitations for future research.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Geochemistry & Geophysics
Deshun Kong, Zihan Zhou, Rongli Jiang, Shuojiang Song, Shan Feng, Minglei Lian
Summary: This study investigated the technological conditions and kinetic model of acid leaching aluminum and iron ions from high-iron and low-aluminum coal gangue. The results showed that the leaching ratio of iron ions exceeded 90% and that of aluminum ions exceeded 60% under specific conditions. The leaching behavior of aluminum and iron ions conformed to the mixing control model equation.
Article
Engineering, Chemical
Pengcheng Hu, Yimin Zhang, Hong Liu, Tao Liu, Sheng Li, Ruobing Zhang, Zhijie Guo
Summary: In this research, a two-stage leaching process was proposed to extract vanadium efficiently from the by-product of vanadium titanium magnetite BOF steelmaking process, vanadium slag (VS). The total leaching efficiency of vanadium can reach as high as 98.52% by sodium roasting-water leaching for VS and sulfuric acid leaching for water leaching residue (WLR). The mechanism analysis indicates that the structures of wrapping phases and spinel can be effectively destroyed by acid leaching, releasing vanadium in WLR.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Deshun Kong, Zihan Zhou, Shuojiang Song, Rongli Jiang
Summary: In this study, CaF2 and hydrochloric acid were used to extract Al3+ and Fe3+ from coal gangue calcined powder. The results showed that adding 3% CaF2 increased the extraction ratios of Al3+ and Fe3+. The mechanism of CaF2 as an auxiliary to improve the leaching ratio of Fe3+ was explained, and the CaF(2-)assisted acid leaching process was optimized. The research provides a reference for future production.
Article
Chemistry, Physical
Pengcheng Hu, Yimin Zhang, Qiushi Zheng
Summary: This study investigates the separation mechanism of vanadium from iron impurity during vanadium extraction from black shale using oxalic acid. It reveals that oxalic acid can react with iron impurity, forming a ferrous oxalate passivation layer on pyrite surface, which inhibits the dissolution of pyrite and enhances vanadium purity. Density functional theory calculations show that oxalic acid can reconstruct the surface of pyrite and form a stable passivation layer, reducing the reactivity of iron atoms.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Green & Sustainable Science & Technology
Huiyao Hou, Shuang Shao, Baozhong Ma, Xiang Li, Shuyang Shi, Yongqiang Chen, Chengyan Wang
Summary: In this research, nitric acid pressure leaching technology was used to selectively extract aluminum and gallium from circulating fluidized bed fly ash (CFBFA). The study found that the basic separation of aluminum and iron could be achieved during leaching, and a high leaching rate was obtained.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Deshun Kong, Zihan Zhou, Shuojiang Song, Shan Feng, Minglei Lian, Rongli Jiang
Summary: Poly aluminum-ferric Chloride (PAFC) was prepared by microwave calcination and acid leaching method, and used for mine water treatment. The results showed that PAFC had a higher turbidity removal ratio compared to PAC and PAF.
Article
Engineering, Environmental
Yunlong Zhao, Yajie Zheng, Hanbing He, Zhaoming Sun, An Li
Summary: The study investigated the aluminum extraction from bauxite reaction residue (BRR) under different hydrochloric acid leaching conditions. The optimal aluminum dissolution rate was found to be 44.15%, and even after silica removal, the aluminum extraction rate remained stable. Under high pressure, the aluminum extraction rate significantly increased to 84.23%, with the leaching process being controlled by liquid diffusion according to experiments and kinetics analysis.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Hui Li, Yuexin Han, Jianping Jin, Zhenya Zhou
Summary: The study highlighted the importance of curing effect in the sulfuric acid curing-leaching process of vanadium-bearing stone coal. Results showed that fine stone coal had better curing effect compared to coarse stone coal under the same curing conditions, with sulfuric acid penetrating the particles mainly at a depth of 0.5-0.7 mm.
Article
Green & Sustainable Science & Technology
Jie Zhang, Kunpeng Liu, Baijun Yan
Summary: A new synergetic and cleaner method was proposed and verified to alleviate the difficulties of extracting vanadium from high-carbon stone coal and solve the associated pollution problems. The experimental results showed that the method effectively increased the gasification ratio and rate of carbon, and a high-grade vanadium concentrate was obtained through magnetic separation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Shuai Yuan, Mengyu He, Ruofeng Wang, Yongpeng Jin, Yanjun Li
Summary: An innovative multistage suspension roasting technology is proposed for vanadium leaching from stone coal. The results show that carbon removal of 53.13% is achieved in the first-stage roasting, accompanied by disruption of the vanadium-bearing mica lattice and production of dehydrogenated mica through the release of hydroxyl groups and vanadium. In the second-stage roasting, carbon is almost completely removed, and the mica structure is further destroyed and partially converted to feldspar. Under optimal conditions, the vanadium leaching rate increases from 20% using conventional technology to 51.42% using the presented technology.
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)