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Structural and electronic properties of bastnaesite and implications for surface reactions in flotation

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Journal of Rare Earths 2020年第3期38卷 332-338页

作者： Shiming cao yijun cao Zilong Ma Yinfei Liao Xiaolin Zhang School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255000China National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhau 221116China Henan Province Industrial Technology Research Institute of Resources and Materials Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Complex Nonferrous Meal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China

The structural and electronic properties of bastnaesite were studied by using the first-principles method based on the density functional theory(DFT).The geometry structure of bastnaesite was first optimized,and then the Mulliken populations,electron density and density of states were calculated and further analyzed in *** calculation results reveal that it mainly ruptures along the ionic Ce-O and Ce-F bonds during the cleavage of bastnaesite,leaving≡Ce^+,≡F^-and≡CO3^-dangling bonds exposed on the cleavage surface of *** with contact angle measurement,surface complexation theory and XPS analysis,the implications of structural and electronic properties on bastnaesite flotation reactions were *** hydration of exposed strong ionic bond on cleavage surface results in hydrophilic *** to surface complexation theory,the formed surface groups are≡CeOH^0,≡CO3 H^0 and≡FH^0 *** investigated metal ions and flotation reagents complex with surface≡CeOH^0 groups,while≡CO3H^0 and≡FH^0 groups are not involved in the *** high activity of Ce atoms facilitates these surface reactions.

关键词： Bastnaesite Density functional theory calculation Electronic property Flotation Rare earths

A review on sustainable reuse applications of Fenton sludge during wastewater treatment

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 121-132页

作者： Lihui Gao yijun cao Lizhang Wang Shulei Li School of Environment Science and Spatial Informatics China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology Zhengzhou UniversityZhengzhou 450001China

The classical Fenton oxidation process(CFOP)is a versatile and effective application that is generally applied for recalcitrant pollutant ***,excess iron sludge production largely restricts its widespread *** sludge is a hazardous solid waste,which is a complex heterogeneous mixture with Fe(OH)3,organic matter,heavy metals,microorganisms,sediment impurities,and *** studies have aimed to utilize specific Fenton sludge resources based on their iron-rich characteristics,few reports have fully reviewed the utilization of Fenton *** such,this review details current sustainable Fenton sludge reuse systems that are applied during wastewater ***,coagulant preparation,the reuse of Fenton sludge as an iron source in the Fenton process and as a synthetic heterogeneous catalyst/adsorbent,as well as the application of the Fenton sludge reuse system as a heterogeneous catalyst for resource *** is the first review article to comprehensively summarize the utilization of Fenton *** addition,this review suggests future research ideas to enhance the cost-effectiveness,environmental sustainability,and large-scale feasibility of Fenton sludge applications.

关键词： Fenton sludge Heavy metals Coagulant Iron source Heterogeneous catalyst

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Advanced silicon nanostructures derived from natural silicate minerals for energy storage and conversion

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Green Energy & Environment 2022年第2期7卷 205-220页

作者： Hao Wan Wei Ma Kechao Zhou yijun cao Xiaohe Liu Renzhi Ma School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)Namiki 1-1TsukubaIbaraki305-0044Japan

To effectively alleviate the ever-increasing energy crisis and environmental issues,clean and sustainable energy-related materials as well as the corresponding storage/conversion devices are in urgent ***(Si) with the second most elemental abundance on the crust in the form of silicate or silica(SiO_(2)) minerals,is an advanced emerging material showing high performance in energy-related fields(***,photocatalytic hydrogen evolution).For the improved performance in industry-scale applications,Si materials with delicate nanostructures and ideal compositions in a massive production are highly *** account of the reserve,low cost and diverse micro-nanostructures,silicate minerals are proposed as promising raw *** the article,crystal structures and the reduction approaches for silicate minerals,as well as recent progress on the as-reduced Si products for clean energy storage/conversion,are presented ***,some cutting-edge fields involving Si materials are discussed,which may offer deep insights into the rational design of advanced Si nanostructures for extended energy-related fields.

关键词： minerals massive silicate

Experimental study on the dispersion behavior of a microemulsion collector and its mechanism for enhancing low-rank coal flotation

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International Journal of Mining Science and Technology 2023年第7期33卷 893-901页

作者： Fan Lian Guosheng Li yijun cao Baoxun Zhao Guangli Zhu Kai Fan School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China

As the poor dispersion of oily collectors and the inferior hydrophobicity of the mineral surface, the lowrank coal has an unsatisfactory flotation performance when using traditional collectors. In this paper, an ionic liquid microemulsion was used as a collector to enhance its floatability. Flotation test results demonstrated the microemulsion collector exhibited a superior collecting ability. A satisfactory separation performance of 78.66% combustible material recovery was obtained with the microemulsion collector consumption of 6 kg/t, which was equivalent to the flotation performance of diesel at a dosage of25 kg/t. The dispersion behavior of the microemulsion collector was investigated using the CryogenicTransmission Electron Microscopy. The interaction mechanism of the microemulsion collector on enhancing the low-rank coal flotation was elucidated through the Zeta potential and contact angle measurements, the Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy *** microemulsion collector exhibited superior dispersibility, which was dispersed into positively charged oil droplets with an average size of 160.21 nm in the pulp. Furthermore, the nano-oil droplets could be more efficiently adsorbed on the low-rank coal surface through electrostatic attraction, resulting in the improvement of its hydrophobicity. Thus, the microemulsion collector shows great application potential in improving the flotation performance of low-rank coal.

关键词： Microemulsion Dispersion Nano-oil droplets Flotation Interaction mechanisms

A novel molybdenite depressant for efficient selective flotation separation of chalcopyrite and molybdenite

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International Journal of Mining Science and Technology 2024年第8期34卷 1179-1196页

作者： Mengyao Qi Weijun Peng Wei Wang yijun cao Longyu Zhang Yukun Huang School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Zhongyuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou 450001China The Key Lab of Critical Metals Minerals Supernormal Enrichment and Extraction Ministry of EducationZhengzhou 450001China

A novel small molecule depressant(M-DEP)was used to separate chalcopyrite and molybdenite via *** results showed that M-DEP had an excellent selective depression on molybdenite,while had little effect on the flotation of *** adsorption capacity of M-DEP on the surface of molybdenite was greater than that on chalcopyrite *** adsorption of M-DEP reduced the floatability of molybdenite and had less effect on the floatability of chalcopyrite,which was due to its different adsorption modes on the surface of the two ***,the interaction between chalcopyrite and M-DEP was mainly chemical interaction,and almost all of the adsorbed M-DEP molecules were removed and replaced by sodium butyl xanthate(SBX).By contrast,hydrophobic interaction was the main way in which M-DEP was adsorbed on the molybdenite surface with little chemical interaction,which was less interfered by SBX ***,M-DEP had a super selective depression on *** study provided a novel depressant and approach for the deep separation of chalcopyrite and molybdenite via flotation.

关键词： Novel molecule depressant Molybdenite Chalcopyrite Flotation separation Selective depression

A single-phase turbulent flow numerical simulation of a cyclonic-static micro bubble flotation column

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International Journal of Mining Science and Technology 2012年第1期22卷 95-100页

作者： Yan Xiaokang Liu Jiongtian cao yijun Wang Lijun School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China School of Power Engineering China University of Mining&TechnologyXuzhou 221116China

Improved fluid dynamics can enhance the separation efficiency of flotation methods. A Computational Fluid Dynamics simulation using FLUENT was performed to model the fluid environment of a cyclonic-sta- tic micro bubble flotation column. The simulation results visually show the interior flow and illustrate mix- ing of the different flows within the apparatus. An analysis of the distribution in velocity and vorticity was used to analyze the separation mechanism and the synergism of the component parts and to strengthen the design of each unit. The conclusions are that axial back mixing and vortexes still exist in the separation unit even in the presence of packing media. The inverted cone structure near the tangential inlet （cone 1 ） within the cyclonic unit is the main reason for this. The cone 1 structure enhances swirling and focuses energy within the inner area of the cone where there are abundant bubbles. As a result slowly floating minerals are forcibly recovered and railings are effectively separated within this unit. However, cone 1 also reduces the vorticity downstream from it, which reduces the efficiency of railings separation within this part. Therefore, the design of cone 1 should be based on the principles of lessening disturbances to the column unit while strengthening the separation effect of the cyclonic unit. Also, the axial distance between the paired cyclonic structures at the bottom of the column （cone 2） and cone 1 poses tough requirements because of an interaction between separation of the middlings and railings.

关键词： Cyclonic-static micro bubble flotationcolumn CFD Flow field Vorticity magnitude Optimization design

Coal petrology characteristics of middlings from Qianjiaying fat coal mine

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International Journal of Mining Science and Technology 2013年第5期23卷 777-782页

作者： Zou Wenjie cao yijun Zhang Zhijun Liu Jiongtian School of Chemical Engineering and Technology China University of Mining & Technology National Engineering Research Center of Coal Preparation and Purifcation China University of Mining & Technology School of Chemical and Environmental Engineering China University of Mining & Technology

The objective of this paper is to evaluate the coal petrology characteristics of slack middlings(13–0.5 mm)of dense media separation and flotation middlings from Qianjiaying fat coal preparation *** composition,macerals distribution,microlithotype and mineral occurrence of the two middlings were studied by XRD analysis and polarized light microscopy *** distribution and wettability of the float-and-sink products separated from the middlings after grinding was investigated to determine the liberation *** show that there are more vitrinite and mineral,but less inertinite in slack middlings than in flotation *** associated with mineral in slack middlings is 69.85%,by volume,which is 17.86%higher than that in flotation *** in slack middlings are dominated by pyrite and clay,which are disseminated with the diameter less than2 *** main mineral in flotation middlings is clay with size range of 2–20 *** macerals in the slack middlings are diffcult to liberate due to the fne-grained *** grinding,macerals associated with minerals in the slack middlings decrease to 46.73%,by volume,which is higher than in flotation middlings by 25.89%,by *** slack middlings with poor liberation degree,density fractions below1.8 g/cm3is hydrophobic with contact angle above 71.5°.For the well liberated flotation middlings,there is signifcant wettability difference among the float-and-sink *** research is the theoretical basis to realize re-separation of middlings.

关键词： Middlings Macerals Mineral liberation Wettability

Advances in depressants used for pyrite fotation separation from coal/minerals

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International Journal of Coal Science & Technology 2022年第4期9卷 29-48页

作者： Yulong Li Gan Cheng Mengni Zhang yijun cao Ee Von Lau College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Henan Key Laboratory of Coal Green Transformation Henan Polytechnic UniversityJiaozuo 454000China Collaborative Innovation Center of Coal Work Safety and Clean High Efciency Utilization Henan Polytechnic UniversityJiaozuo 454000China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450000China School of Engineering Monash University MalaysiaSelangor 47500Malaysia

Pyrite is separated from other minerals mainly by ***,the hydrophilicity of pyrite is afected by many factors,causing it to easily enter the concentrate and consequently reduce the quality of *** efcient pyrite depressants can be selectively adsorbed on the surface of pyrite to improve its hydrophilicity,thereby increasing the fotation separation *** the fundamental inhibition mechanism of depressants on pyrite is a prerequisite to improve the fotation desulfurization *** inhibition ability and mechanism of diferent types of pyrite depressants are reviewed in this *** recent years,molecular simulation has increasingly become a powerful tool to study the interaction between reagents and minerals,shedding new light on the adsorption mechanisms of reagents on mineral surfaces at the atomic and electronic *** properties of sulfde mineral and fotation reagents as well as the microscopic adsorption mechanistic studies of reagents on mineral surfaces based on quantum chemistry and molecular simulation are also reviewed.

关键词： Pyrite Flotation Depressant Coal Mineral

Effect of a cyclonic flotation column on the separation of magnesium from phosphate ore

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Mining Science and Technology 2011年第5期21卷 647-650页

作者： Li Guosheng Liu Jiongtian cao yijun Wang Dapeng School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221008 China

This study was performed to investigate the effects of the cyclonic separation mechanism on the removal of magnesium from phosphate ore. An analysis of the particle-bubble collision mechanism in a cyclonic force field was used to design two different pulp circulation systems for a cyclonic-static micro-bubble flotation column （FCSMC）. Experiments comparing the two conditions were then conducted. Size analysis of the feed and separated products was conducted with a BXF cyclone size analyzer. The results show that about 34.60% of the total MgO content in the feed exists in the -10 μm fraction. This demonstrates that magnesium removal from phosphate ore has the characteristics of a micro-fine particle flotation problem. Under conditions of cyclonic circulation the MgO level of the concentrate is 1.74g, which is lower than that obtained from the column operated in direct-flow circulation by 0.34%, These results indicate that the cyclonic circulation mechanism of the FCSMC can promote removal of micro-fine particles containing magnesium. This is attributed to the function of surface flotation and to the reduction of the lower separation limit under conditions of cyclonic circulation.

关键词： Flotation columnCyclonic separationPhosphate oreRemoval of magnesium