Article
Green & Sustainable Science & Technology
Keheng Pan, Jijia Deng, Guangfei Qu, Kunling Wei, Yuqi Liang
Summary: This study investigated the process and mechanism of synergistically assisted hydrogen production from tailings and coal slurry. It was found that the influence of lead-zinc tailings extract is primary while the electrocatalysis of Fe3+ has only a slight impact on current density increase.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Zhimin Guo, Jiandong Liu, Zhiwu Lei, Pengfei Hu
Summary: In this study, the researchers investigated the effect of alternate shear conditions on the flocculant-aided filtration performance of coal tailings. They found that sequenced flocculation produced stronger flocs compared to single shear conditions. The flocs formed under two cycles of high and low shear rates were the strongest and contained fewer particles and small flocs. Filtration experiments showed that the coal tailings had the best comprehensive filtration performance under the sequenced flocculation with two cycles of high and low shear rates. The filtration outcomes were consistent with the measurements given by FBRM and PVM.
Article
Chemistry, Physical
Yuye Tan, Xiang Meng, Zhiwei Jiang, Chongchong Han, Mochuan Guo
Summary: This study analyzes the flocculation effect and structure characteristics of different flocculants on classified fine tailings through experiments and observations. The results show that the ZYZ-type flocculant has the best flocculation effect, with a unit consumption of 30 g/t.
Article
Engineering, Chemical
Cuong V. Nguyen, Anh V. Nguyen, Andrew Doi, Emma Dinh, Thuong V. Nguyen, Majid Ejtemaei, Dave Osborne
Summary: The study highlights the importance of clay mineral surface chemistry in the dewatering process of clay-rich mine tailings. By neutralizing the clay surface charge with salts and flocculating with salt-resistant flocculants, an effective dewatering technique can be achieved. Combining chemical reagents with solid bowl centrifugation can deliver successful dewatering outcomes and improve water quality for recycling.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Aosheng Yang, Yinfei Liao, Maoyan An, Yijun Cao, Zhe Yang, Hourui Ren, Hailong Su, Qiqi Zou, Luojian Chen
Summary: This paper studied the mechanism of ultrasonic pretreatment to promote flocculation and filtration of low-rank coal (LRC) slurry. The results showed that ultrasonic pretreatment can promote the flocculation and filtration performance of LRC slurry, increase the filtration rate, decrease the cake moisture content, and improve the permeability of the filter cake to water.
Article
Materials Science, Characterization & Testing
Jun Xiong, Quan Jiang, Chao Zhang
Summary: This study investigated the treatment method of tailings slurry, showing that nonsegregation flocculation can improve the drainage performance and stability of tailings. It is recommended to use large-sized flocs and geotextiles with large pore sizes for optimal drainage strategy in building tailings dams.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Engineering, Chemical
Yijiang Li, Yuting Chen, Wencheng Xia, Guangyuan Xie
Summary: The study investigated the filtration of kaolinite-coal mixture suspension through settling behavior observation and filter cake structure analysis. A high kaolinite content mixture showed increased settling rate and specific filter cake resistance, forming fewer and smaller pores in the filter cake structure. The high settling rate led to quick filter cake formation during filtration, which increased the specific filter cake resistance.
Article
Energy & Fuels
Hanmiao Zhou, Song Li, Suping Zhao, Junjian Wang, Mingfeng Wang
Summary: This study investigates the variation of fracture structure and coal permeability with effective stress using three-dimensional (3-D) micro-CT and digital core techniques. The results demonstrate that different types of fractures exhibit different sensitivities to effective stress, and the permeability of coal decreases exponentially with increasing effective stress and shows an anisotropic behavior in space.
Article
Energy & Fuels
Qiming Zhuo, Donghui Wang, Hongxiang Xu, Wenli Liu, Liang Gao
Summary: This study investigates the pore structure and permeability of filter cakes in coal slurry filtration process, showing that as filtration time increases, the filter cakes exhibit smaller pores, lower porosity, narrower pore size distribution, and higher fractal dimension. The relationship between filter cake permeability and thickness follows a first-order exponential decay law, with a proposed critical thickness determined by the maximum curvature point of the permeability-thickness curve, providing theoretical support for achieving efficient coal slurry filtration.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Construction & Building Technology
Tao Luo, Yu Yi, Fang Liu, Qiang Sun, Xiaofeng Pan, Cheng Hua
Summary: The study examines the effects of molybdenum tailings replacement on the properties of concrete and finds that higher replacement amounts can increase slump and air content, as well as improve compressive strength in the early stages. However, in the later stages, the compressive strength gradually decreases.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Yao Liu, Hongwei Deng
Summary: The permeability of backfill affects the leaching and transport of pollutants to groundwater, which is determined by the pore structure. The study used different additives to make backfill samples with varying curing ages and cement-sand ratios. It was found that the backfill exhibits fractal characteristics, and the permeability is correlated to the pore structure and porosity. The feasibility of the fractal bound water saturation model and Coates model was validated in predicting the permeability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xin Wang, Quanle Zou, Ying Liu, Zuoyuan Li
Summary: Cementing technology is crucial for prolonging the life of coalbed methane surface drilling. Adding dispersants can enhance the fluidity and pumping efficiency of cement paste, thus improving the cementing quality. Research on the effect of naphthalene dispersant on the hydration kinetics of G-grade cement shows that it can effectively slow down the cement hydration process by affecting the cement particle potential and forming stable complexes with Ca2+ ions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Energy & Fuels
Jiajia Liu, Zishuo Nie, Yuanlong Li, Ming Yang, Yunlong Zhang
Summary: This paper proposed a microstructural analysis for coal-rock based on low-field nuclear magnetic resonance (LNMR) technology, the L-weighing method, to accurately and quantitatively characterize the evolution of coal microstructures before and after supercritical CO2 treatment. The experimental results of the L-weighing method and the LNMR method were compared and analyzed, and it was found that there were differences between the two methods but the overall laws were basically the same. The L-weighing method quantitatively characterizes the water content in coal and determines water consumption and microscopic component extraction in coal with supercritical CO2, while the LNMR method only determines the dissolution of H-containing substances in the coal by supercritical CO2. According to the combined analysis with the L-weighing method and the LNMR method, it was found that the supercritical CO2 treatment led to water consumption, extraction of microscopic components, volume expansion, permeability increase, and pore connectivity increase in the coal microstructure.
Article
Energy & Fuels
Qiming Zhuo, Wenli Liu, Hongxiang Xu, Donghui Wang
Summary: This study investigated the influence of particle size distribution on the filter cake pore structure and the coal slurry dewatering process through visual and quantitative methods. The experimental results showed that the proportion of micropores increased with fine particle content, and the uniformity of pore size distribution initially decreased and then increased.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
G. S. S. Raman, M. S. Klima
Summary: Pressure filtration can be used to handle coal refuse slurry, reducing the need for impoundments and improving filtration performance. Experimental results showed that filtration time and pH have significant effects on cake moisture and the amount of solids deposited in the cake.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2022)
Article
Environmental Sciences
Jing Hu, Chengbin Zhu, Yunchuan Long, Qin Yang, Shaoqi Zhou, Pan Wu, Juan Jiang, Wei Zhou, Xuejun Hu
Summary: This study investigated the interaction between dissolved heavy metals and coexisting chemical factors in karst wetland waters by analyzing surface water samples from Caohai Wetland. Results indicated that pH, dissolved oxygen, electrical conductivity, SO42-, and HCO3- were the main factors influencing heavy metals. The main cations were Ca2+ and the main anion was HCO3-. These findings provide valuable geochemical information for assessing and managing heavy metal pollution in water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yunchuan Long, Juan Jiang, Xuejun Hu, Jing Hu, Chunguang Ren, Shaoqi Zhou
Summary: The study investigated the response of sediment microbial communities in Caohai Lake to anthropogenic activities and found that physicochemical changes caused by human activities may influence enzyme activities in a non-linear pattern. Although there were few differences in alpha diversity indices between high and low disturbed areas, clear disparities in microbial community composition and beta-diversity analysis were observed. The intensity of anthropogenic impacts in Caohai was found not to have reached potential thresholds, and the best distinguish biomarkers between the two areas were not necessarily the ones with high microbial abundance.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Energy & Fuels
Pengfei Hu, Long Liang, Biao Li, Wencheng Xia
Summary: This study quantitatively investigated the heterocoagulation in a binary mineral mixture of coal and quartz using experimental systems based on in-situ FBRM and PVM. Results showed that heterocoagulation degree was influenced by shear rates and agitation time.
Article
Environmental Sciences
D. Liu, S. Zhou
Summary: The study showed that phosphorus can be efficiently recovered from glyphosate-rich wastewater through chemical coagulation.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Wangde Deng, Dongqing Zhang, Xiaoxian Zheng, Xingyao Ye, Xiaojun Niu, Zhang Lin, Mingli Fu, Shaoqi Zhou
Summary: Marble waste, sepiolite, and agricultural waste were used to synthesize two modified-biochar composites for phosphate removal. These composites exhibited excellent adsorption performance and can be applied as fertilizer to increase soil fertility.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Xuexia Wang, Xiangning Bu, Chao Ni, Shaoqi Zhou, Xiaolin Yang, Jing Zhang, Muidh Alheshibri, Yaoli Peng, Guangyuan Xie
Summary: Scrubbing is a suitable method for cleaning fine slime on microcrystalline graphite surface and improving its flotation performance. This study found that the particle size of the scrubbing medium is the most important factor influencing the enrichment efficiency of microcrystalline graphite. The optimal conditions for the scrubbing process were determined and confirmed through testing.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Meng Li, Juan Zhou, Yong-Guang Bi, Shao-Qi Zhou, Ce-Hui Mo
Summary: The polypyrrole/sewage sludge carbon electrode showed excellent electrochemical performance in removing Cr(VI) and releasing bio-energy in microbial fuel cells. It exhibited low charge transfer resistance and high electrochemical activity, leading to stable Cr(VI) removal and power production. This composite material can serve as an effective and low-cost catalyst for accelerating Cr(VI) reduction and enhancing bio-power production.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Zhimin Guo, Long Liang, Pengfei Hu
Summary: Preconditioning of coal tailings with flocculants is an effective technology to improve filtration performance. This study used NMR to analyze the filter cakes of coal tailings formed during filtration with different flocculants, revealing changes in water status during the filtration process. The results showed that anionic polyacrylamide formed larger structures in the initial stages of filtration and resulted in filter cakes with more entrapped water.
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
(2021)
Article
Environmental Sciences
Yunchuan Long, Xuejun Hu, Juan Jiang, Jing Hu, Chengbin Zhu, Shaoqi Zhou
Summary: The cultivation of different aquatic plants in sediment can affect the sorption-desorption behaviors of phosphorus, with differences observed between submerged plants like Hydrilla verticillata and emerged plants like Scripus triqueter. The study suggests that the growth of submerged plants may enhance P retention capacity and reduce release risk in sediments.
Article
Engineering, Chemical
Ke Zheng, Shaoqi Zhou, Zuqin Cheng, Guoru Huang
Summary: The study shows that introducing QPPO into the substrate is a sensible strategy for fabricating high-performance TFC FO membranes, as it improves the structure and performance of the membranes and enhances FO performance.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Environmental Sciences
Yang Liu, Feiyan Liu, Kylie Fei Dong, Yongning Wu, Xingfen Yang, Jintao Yang, Hong Tan, Xiaojun Niu, Xinyuan Zhao, Gexin Xiao, Shaoqi Zhou
Summary: The blood lead levels of children in China are still notably high in many areas, primarily due to lead pollution from industries like lead mining and recovery. Some regions have children with blood lead levels exceeding the standard, which requires attention.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Runyuan Zhang, Xiaoxian Zheng, Dongqing Zhang, Xiaojun Niu, Jinlin Ma, Zhang Lin, Mingli Fu, Shaoqi Zhou
Summary: The study showed that the natural endogenous minerals in biochar can promote the formation of porous and defective structures, increase carbonization and graphitization degree, and exhibit higher catalytic efficiency in the activation of persulfate for tetracycline degradation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Xiaomin Xu, Yongqing Zhang, Shaoqi Zhou, Renfeng Huang, Shaobin Huang, Hainan Kuang, Xianlin Zeng, Shuaifei Zhao
Summary: The study investigated the use of manganese oxyhydroxide (MnOOH) as an activator for persulfate (PS) to degrade p-chloroaniline (PCA) from wastewater. Results showed that higher MnOOH and PS addition enhanced PCA degradation efficiency, while the degradation efficiency was slightly inhibited as the initial pH increased from 3 to 9. This research provides insights into the activation mechanism of PS by manganese oxide and supports the practical application of AOPs of manganese-based materials for wastewater treatment.
Article
Chemistry, Physical
Qiang Li, Long Liang, Pengfei Hu, Guangyuan Xie
Summary: The study conducted experiments to observe the heterocoagulation between coal and quartz particles of different sizes at various pH levels, finding variations in the heterocoagulation process under different conditions. The heterocoagulation of fine quartz particles was mainly influenced by electrostatic forces, while the heterocoagulation of coarse quartz particles was attributed to non-DLVO forces such as friction.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Review
Engineering, Chemical
Pengfei Hu, Qiang Li, Long Liang
Summary: Heterocoagulation between mineral particles is extensive in both spontaneous and controlled processes, with various characterization techniques developed to provide a better understanding of the mechanism. These methods offer a wealth of options for studying mineral heterocoagulation, and combining different techniques can enhance the persuasibility of viewpoints. Developing in-situ and quantitative characterization techniques will further assist in the fundamental understanding of heterocoagulation mechanisms between mineral particles.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
