Article
Chemistry, Physical
Hao Zhang, Rongbo Zhao, Zhiliang Liu, Xiangchao Zhang, Chunfang Du
Summary: In this study, ammonium phosphotungstate/kaolinite-rich coal gangue (NH4-PW/CG) adsorbents were synthesized for the removal of ciprofloxacin (CIP). The presence of kaolinite-rich CG significantly enhanced the adsorption efficiency of NH4-PW/CG, providing an efficient adsorbent for the comprehensive utilization of kaolinite-rich CG and removal of positively charged pollutants.
APPLIED CLAY SCIENCE
(2023)
Article
Construction & Building Technology
Zhongtao Luo, Jinyang Guo, Xiaohai Liu, Yuandong Mu, Meixiang Zhang, Meng Zhang, Chongfei Tian, Jiahui Ou, Jie Mi
Summary: This study investigated the feasibility of using a combination of lead-zinc tailings and coal gangue to produce ceramsite, achieving the solidification of heavy metals. The results showed that ceramsite can be prepared using lead-zinc tailings and coal gangue when the lead-zinc tailings content is less than 30%, and the prepared ceramsite meets the requirements of environmental safety.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jiaxu Jin, Zhifa Qin, Xilin Lu, Tao Liu, Guosen Zhang, Jinyan Shi, Shenghao Zuo, Daiqi Li
Summary: This study proposes a novel coal gangue-filled backfill using a self-consolidating cement-tailings grout (CTG) to fill voids in a pre-placed coal gangue skeleton. By optimizing the mixture proportions of self-consolidating CTGs, the fresh CTGs show enhanced static stabilities and filling abilities, leading to advantages in strengths and strength efficiencies over conventional cemented tailings backfills. The use of high-volume solid waste in CGFBs also brings benefits of low costs and low environmental impacts.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Environmental Sciences
Xiaoxia Long, Zhijie Yang, Qi Li, Tianyan Feng, Guangfei Qu, Ping Ning, Yonghui Li, Dongdong Zhang
Summary: The activity of copper tailings and gangue were improved by thermal activation, and composite cementitious materials based on copper tailings were prepared by alkali excitation. The best activation temperatures were found to be 800 degrees C for copper tailings and 600 degrees C for gangue. The resulting cementitious material exhibited good compressive strength through the process of dissolution-reconstruction-polymerization-curing reaction.
FRESENIUS ENVIRONMENTAL BULLETIN
(2022)
Article
Environmental Sciences
Jisheng Qiu, Xi Luan, Kun Cheng, Xiao Guan, Minmin Yang, Zhijie Xiao
Summary: Based on the problems of high carbon emission and high cost, the study used tailings powder modified Coal Gangue-based Cementitious Backfill Material (CGCBM) for paste filling mining. Different tailings powder content and curing ages were tested, and the changes in macroscopic strength and microstructure were explored. Results showed that adding 50% tailings powder had the most significant optimization effect on the performance of CGCBM, improving macroscopic mechanical strength by filling surface holes and promoting secondary hydration.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Yuanyuan Zhang, Peizhen Zhao, Fengling Yang
Summary: The thermal conversion characteristics of coal gangue, weathered coal, and pine sawdust in CO2/N-2 atmosphere were investigated, focusing on the reaction behavior of char and CO2. The results showed that all three materials had two main stages of thermal conversion, with pine sawdust having a shorter conversion time. Mass loss of coal gangue/pine sawdust blends had four overlapped peaks, while coal gangue/weathered coal mixtures had two separated peaks. The addition of weathered coal or pine sawdust improved the char-CO2 reactivity of coal gangue, but interactions were absent between coal gangue and weathered coal.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Materials Science, Multidisciplinary
Zhenxia Li, Tengteng Guo, Yuanzhao Chen, Xu Zhao, Yanyan Chen, Xiao Yang, Jing Wang
Summary: The research found that Spontaneous combustion coal gangue has higher activity than Unspontaneous combustion coal gangue. The 4% cement dosage mixture not only meets the requirement of early strength but also shows an efficient strength growth rate and good dry shrinkage resistance. As time goes on, the structure of the mixture becomes more compact and the overall integrity is enhanced, which may lead to better road performance.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Engineering, Chemical
Huaizhu Li, Lingxue Kong, Jin Bai, Zongqing Bai, Zhenxing Guo, Wen Li
Summary: The flow property of coal ash and slag is crucial for slag tapping in gasifiers. Adding coal gangue with different SiO2/Al2O3 ratios was investigated to modify the flow properties of coal rich in calcium and iron. The results showed that the addition of coal gangue can effectively improve the ash flow properties by altering the chemical composition of the ash and modifying the slag viscosity.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yunjia Liu, Songlin Wu, Tuan A. H. Nguyen, Ting-Shan Chan, Ying-Rui Lu, Longbin Huang
Summary: Organic matter amendments and plant colonization can accelerate mineral weathering and soil formation in metal mine tailings. However, they may also dissolve uranium-bearing minerals and increase uranium dissolution. This study investigated the solubility and distribution of uranium in amended and plant-colonized tailings, and found that biochar can decrease soluble uranium levels and facilitate uranium immobilization.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Andrew Doi, Tuan A. H. Nguyen, Ngoc N. Nguyen, Cuong Nguyen, Foad Raji, Anh Nguyen
Summary: Mineral tailings dams pose pollution risks and catastrophic failures. Dry stacking offers a promising alternative, but research outcomes are lacking. Different dewatering methods and chemical aids were used to produce semi-solid cakes from coal tailings slurries. The handleability and disposability of these cakes were influenced by polymer flocculant selection, mechanical dewatering technique, clay mineralogy, and residue moisture. Increasing solid concentration led to increased yield stress and stiff growth. Polymer flocculants increased shear strength, but the selection requires trade-offs between disposability and handleability. Cationic and anionic PAM were found suitable for different dewatering methods.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Physical
Xin Zhang, Min Li, Yiguo Su, Chunfang Du
Summary: In this study, a novel adsorbent CM/CTAB based on solid waste coal gangue and hexadecyltrimethyl ammonium bromide was successfully synthesized with excellent removal performance and high selectivity towards Cr(VI). The maximum adsorption capacity for Cr(VI) was 55.09 mg/g and the removal efficiency reached 85% within 15 minutes, better than most reported mineral-based adsorbents. The enhanced performance was attributed to the synergistic effect of Cr(VI) adsorption and reduction, fitting well with pseudo-second-order and Langmuir isotherm model. This work provides an efficient adsorbent for Cr(VI) removal and contributes to the comprehensive utilization of solid wastes.
APPLIED CLAY SCIENCE
(2021)
Article
Construction & Building Technology
Yifan Li, Songhui Liu, Xuemao Guan
Summary: This study investigated the macro performance and microscopic properties of coal gangue concrete, finding that coal gangue has better overall compactness and strength compared to ordinary concrete, but lower fluidity and compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jinwang Zhang, Geng He, Shengli Yang
Summary: This study found that conducting water intervention at temperatures lower than the ambient air temperature can significantly improve the efficiency of recognizing coal and gangue, with the maximum temperature difference reached within 10 seconds, five times greater than traditional methods. As the water temperature increases, the average temperature difference between coal and gangue shows a linear downward trend.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Engineering, Chemical
Yang Yang, Qingliang Zeng
Summary: This study proposes a coal gangue category recognition method based on IoT technology and impact-slip contact characteristics, which achieves accurate identification of coal gangue through the establishment of an IoT recognition system and the design of an impact-slip test bed. The research results show that the random recognition accuracy of coal gangue categories can reach 0.935, which provides a theoretical basis for further improving the classification recognition effect.
Article
Construction & Building Technology
Junbo Sun, Shukui Liu, Zhanguo Ma, Haimin Qian, Yufei Wang, Hisham Al-azzani, Xiangyu Wang
Summary: This study aims to promote the utilization of coal gangue in shotcrete production and enhance its reusability. It investigated the impact of coal gangue aggregate-to-sand ratio, PVA fiber-to-cement ratio, and coal gangue aggregate particle size on the properties of lightweight coal gangue shotcrete. By using machine learning models and sensitivity analysis, accurate and reliable predictions were obtained.
JOURNAL OF BUILDING ENGINEERING
(2023)
