Article
Energy & Fuels
Da Shi, Jianbo Zhang, Huiquan Li, Shaopeng Li, Fayu He, Jiangshan Qu, Ruiqi Chang, Ganyu Zhu, Chennian Yang, Chenye Wang
Summary: Coal gasification fine slag (CGFS) generated in the coal chemical industry poses serious environmental pollution and resource wastage. By studying the phenomenon of covering between CGFS particles, this study proposes a selective dispersion flocculation flotation method to efficiently separate unburned carbon (UC) from CGFS. The mechanism of selective dispersion flocculation is revealed through the analysis of adsorption mode, interaction force between particles, and particle size distribution. Results show that selective adsorption controls the agglomeration of particles, transforming the original carbon-ash selective agglomeration state to carbon-carbon selective agglomeration state. This work improves the recovery rate of combustible materials and provides guidance for the separation of carbon and ash from gasification slag in industry.
Article
Engineering, Chemical
Kai Cheng, Xiqing Wu, Honghu Tang, Yong Zeng
Summary: The study found that the addition of PAAS before NaOL in flotation tests significantly increased the recovery rate of fine hematite, and successfully separated fine hematite from quartz. The findings suggest that the mechanism involves the flocculation of hematite particles by PAAS, which improves floatability and inhibits the adsorption of NaOL on quartz surfaces.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Physical
Bin Yang, Lingtao Zhu, Jingfeng He, Yafeng Fu, Wanzhong Yin
Summary: Pentaethoxylated tallow amine (PTA) was introduced as a selective collector for separating siderite from hornblende for the first time. The results showed that PTA strongly collected hornblende but not siderite, leading to enhanced differences in flotation performance. The adsorption measurements revealed that hornblende adsorbed more PTA than siderite, increasing the hydrophobicity of hornblende. The analysis of zeta potential and FTIR confirmed that the strong adsorption of PTA on hornblende was due to hydrogen bonding and electrostatic attraction. The use of PTA as a collector achieved effective separation of hornblende from siderite.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Bin Yang, Wanzhong Yin, Jin Yao, Qiuyue Sheng, Zhanglei Zhu
Summary: This study focused on the collection performance and sorption mechanisms of decaethoxylated stearylamine (DSA) as a high-selectivity hornblende collector. It was found that DSA efficiently collected hornblende, but had a poor collecting ability for siderite. The selective collection mechanisms of DSA for hornblende were attributed to electrostatic adsorption and hydrogen bonding interaction, leading to efficient desiliconization of the siderite flotation.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Yusheng Wang, Weiguang Zhou, Yijiang Li, Long Liang, Guangyuan Xie, Yaoli Peng
Summary: This study systematically investigated the role of PVP in coal flotation, showing that PVP preferentially adsorbed on quartz and kaolinite surfaces rather than coal. The selective flocculation of quartz and kaolinite by PVP promoted the selectivity of flotation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Review
Metallurgy & Metallurgical Engineering
Kaveh Asgari, Hamid Khoshdast, Fardis Nakhaei, Mohammad Reza Garmsiri, Qingqing Huang, Ahmad Hassanzadeh
Summary: Flotation process is commonly used for mineral beneficiation, and the particle size is an important factor affecting its effectiveness. Fine and ultra-fine particles present challenges in flotation due to their large surface area and reduced collision and attachment probabilities. Agglomeration and flocculation techniques combined with flotation show promise in economically recovering these particles, although there are still gaps in understanding the exact mechanisms and effects on flotation behavior.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2023)
Article
Engineering, Chemical
Zhen Wang, Nengyun Liu, Dan Zou
Summary: This paper investigates the improvement of hydrophobization and flotation performance of fine pyrite using mixed C-1/C-2 reagents, with the results showing better flocculation and flotation recovery. The interaction mechanism involves hydrophobization through reagent adsorption, as well as potential amidation reactions between different functional groups. The study highlights the importance of bridging flocculation in achieving larger floc sizes for effective flotation recovery.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Energy & Fuels
Bowei Zheng, Scott D. Taylor
Summary: Using cationic starch as a flocculant for mature fine tailings (MFT) during oil sands extraction has been proven effective for flocculating 2-10 wt % MFT in tap water and oil sands process water. Nonthermoresponsive and thermoresponsive cationic starches showed different performances in flocculating MFT, with the thermoresponsive starch exhibiting higher settling rates at temperatures above its lower critical solution temperature.
Article
Engineering, Chemical
Qiurong Long, Hao Wang, Xinyang Wang, Feng Jiang, Junjie Zhang, Laichang Zou, Qiankun Wang, Zhongmei Sun, Yufang Zhang, Wang Lu, Binda Lu, Peiyuan Ye, Wen Tan, Zhouguang Lu, Zhenghe Xu
Summary: A novel switchable pseudo-Gemini collector (PGC) called T-OA is developed for flotation recovery of fine copper oxides from silica. It shows pH-responsive collecting power and enhanced selectivity. Micro-flotation experiments demonstrate over 90% CuO recovery at T-OA concentrations as low as 0.01 mM and pH 10. Flotation pH adjustment to 5 switches T-OA to a monomeric form with higher selectivity.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Physical
Wencheng Xia, Yijiang Li, Feng Wu, Chenkai Niu
Summary: The flotation process of fine non-coking coal from kaolinite was improved by the addition of anionic polyacrylamide, which interacted with kaolinite and coal particles through hydrogen bonding. Anionic polyacrylamide selectively flocculated kaolinite particles, reducing kaolinite pollution in the froth and decreasing the amount of kaolinite particles coating the clean coal surface. Ultimately, the flotation selectivity was enhanced by anionic polyacrylamide pre-conditioning.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Chemical
Ming Zhang, Zeping Xu, Qin Zhang, Zusu Dan, Hongqi Fu, Wei Yao
Summary: Ozone was used as an eco-friendly oxidant to enhance the depressive performance of starch in the reverse flotation of fine hematite. The results showed that ozone-oxidized starch (OS) had better depressing effect on hematite flotation compared to native starch (NS). The improved performance of OS was attributed to its increased acidity, solubility, and depolymerization, as well as its stronger interaction with hematite.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Physical
Huili Han, Wanzhong Yin, Donghui Wang, Zhanglei Zhu, Bin Yang, Jin Yao
Summary: The study demonstrates that citric acid can effectively disperse the strong heterocoagulation between fine siderite, hematite, and quartz, thereby enhancing the separation selectivity of different minerals.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Chemical
Mingyang Li, Yahui Xiang, Tiejun Chen, Xiangpeng Gao, Qi Liu
Summary: In the reverse cationic flotation of ultra-fine hematite-quartz mixtures, the addition of 50 g/t PEO significantly improved the grade and recovery of iron concentrate. Quartz flocculation by PEO greatly assisted its flotation by the cationic collector.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Physical
Ruolin Wang, Hongliang Zhang, Wenjuan Sun, Haisheng Han
Summary: This study found that Pb-starch is an effective depressant for chlorite flotation, selectively decreasing its flotation rate and recovery. The zeta potential of chlorite surface increases with the treatment of Pb-starch, and this increase is proportional to the dosage of lead nitrate. Using FTIR spectra and XPS measurement, it was determined that starch and Pb-starch chemisorb onto chlorite, with the functional group of starch being hydroxy and Pb-starch being Pb-O group. Additionally, the optimal adsorption configuration was determined through DFT computation, with the glucose-Pb2+ complex adsorbing on the silica-terminated chlorite surface through three covalent bonds of Pb2+ and O atoms.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Fuqiang Tian, Peng Li, Yijun Cao, Haiqing Hao, Weijun Peng, Guixia Fan
Summary: This work successfully prepared low-molecular-weight carboxylated starch (LMWCS) as a selective depressant for the flotation separation of ilmenite and forsterite. LMWCS showed stronger depression on forsterite flotation compared to natural starch. X-ray photoelectron spectroscopy analysis confirmed that LMWCS was adsorbed onto the ilmenite surface via weak hydrogen bonds, while it adsorbed onto the forsterite surface via strong chemisorption. The higher adsorption layer density of LMWCS on the forsterite surface suggests that LMWCS is an effective and promising depressant for forsterite flotation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Crystallography
Lixia Li, Haiqing Hao, Zhitao Yuan
Article
Chemistry, Physical
Chen Zhang, Xuming Wang, Jiaqi Jin, Lixia Li, Jan D. Miller
Summary: Most slip length measurements have been made on synthetic or modified synthetic materials, with few reports on unmodified natural mineral surfaces. Slip length measurements were conducted on the silica face surfaces of talc and mica using atomic force microscopy (AFM). Results showed contrasting slip length conditions between the hydrophobic silica surface of talc and the hydrophilic silica surface of mica.
COLLOIDS AND INTERFACES
(2021)