A5101675740- Recycling and Waste Management Techniques
- Minerals Flotation and Separation Techniques
- Extraction and Separation Processes
- Mineral Processing and Grinding
- Cyclone Separators and Fluid Dynamics
- Coal and Its By-products
- Coal Properties and Utilization
- Aerosol Filtration and Electrostatic Precipitation
- Municipal Solid Waste Management
- Metal Extraction and Bioleaching
- Granular flow and fluidized beds
- Belt Conveyor Systems Engineering
- Fluid Dynamics and Mixing
- Iron and Steelmaking Processes
- Coal Combustion and Slurry Processing
- Graphite, nuclear technology, radiation studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Advancements in Battery Materials
- Mineralogy and Gemology Studies
- Microplastics and Plastic Pollution
- Nonlinear Optical Materials Studies
- Particle Dynamics in Fluid Flows
China University of Mining and Technology
2015-2023
In this study, the rotary triboelectrification separation technology is applied to of macerals for low rank coal, which has not been studied by previous researchers. The effects air humidity and temperature on permittivity specific-charge were tested ensure that vitrinite inertinite effectively separated under obvious electrical differences. best index was determined single factor test, including airflow rate, feed friction wheel speed, plate voltage. test results showed difference most...
The enrichment of vitrinite can enhance the oil yield and conversion rate in low-rank coal liquefaction. work evaluated effects surface modification on rotary triboelectric separation macerals. Permittivity charge–mass ratio analysis inertinite under various modified conditions demonstrated that kerosene diesel were excellent modifiers since they keep permittivity macerals at a low level. largest difference charge was obtained when 3.0 kg/t adopted as modifier. Rotary untreated indicated...
The enhanced gravity concentrator with water medium has been used for the low-rank coal maceral enrichment and achieved a favorable effect. This study utilized magnetite powder as separation in test. different was contrasted, heavy possessed more excellent mechanism better effect, vitrinite content recovery of concentrates increased to 80.40 vol.% 54.85%. In addition, results float–sink test were compared under same density, difference between two methods below 5%, 77.9% 1.40 g/cm3. density...
Triboelectrostatic beneficiation, as a physical method, of fly ash cannot only meet the technical requirements application but also recycle an unburned carbon useful energy source. The aim this study was to investigate feasibility improving efficiency triboelectrostatic beneficiation wet using microwave heating. with different moisture contents had average loss-on-ignition 12.56%. samples were heated in oven before experiments. experimental conditions electric field voltage 40 kV and air...
This paper studies the characteristics of Shenhua low-rank coal, including industrial analysis, element density composition, particle-size maceral and enhanced gravity. The separation coal were examined by manual enrichment, screening enrichment centrifugal heavy-liquid separation. After vitrinite content was 31.06% higher than in raw inertinite increased 13.50% compared with coal. results show that is easily broken into small pieces to be enriched coarser particle size (0.125–0.074 mm),...
This study focused on the separation performance of a typical high-ash coal with high-mud content in enhanced gravity field from viewpoint desliming. After necessity analysis desliming, EGS results fine before and after desliming were examined. The indicators products analyzed, its characteristics compared FF STS. are unsatisfactory without sorting effect −0.045 mm PS is inferior to other PSs. has been improved obviously. optimal ηa 97.93%, ηt 85.99%, ηc 90.50%, ηd 34.67% can be obtained...
ABSTRACT Pulverized coal is separated by rotary triboelectric separation to confirm the best charger speed, voltage, and airflow velocity. On this basis, pulverized surface modified studying four modifiers explore effect of modification on permittivity, specific-charge, indices, including kerosene, diesel, acetic acid, sodium stearate. Finally, indices are compared before after modification. Experimental results show that kerosene has for coal. Under conditions modification, ash deash rate...
The recovery and reuse of waste printed circuit boards (PCBs) has attracted more attention from global researchers, as recycling PCB metals is great significance to the rational utilization metal material resources. This study puts forward a clean economical method in which enhanced gravity separation wet high-gradient magnetic were combined recover PCBs with heat treatment at temperature 240 °C. could improve liberation effect PCBs, thermal behavior was measured by thermogravimetric...
This study carried out component sulfur composition analysis, electron probe microscopic and particle size density analysis of coal samples from a preparation plant in Liupanshui. The influence various factors on the indexes clean products under different separation medium conditions by enhanced gravity technology, including water (WM), magnet powder suspension (MPS), zinc chloride solution (ZCS), is discussed. results show that addition MPS or ZCS has an obvious improvement deashing...
The influence of microwave pretreatment on the heating response, moisture content, surface morphology, grindability, and liberation coal were investigated. results show that irradiation has a weak effect chemical composition, but can reduce content significantly. Intuitionistic evidence was discovered energy induce micron cracks interface among different minerals. grinding tests remarkably promote fine coal. Density analysis shows degree products increases with time due to auxiliary...
The liberation characteristics of long flame coal from the Chinese Shenhua were studied by comparison ball grinding and rod grinding. First, effects time on maceral under different particle size range, including vitrinite content (VC), degree (VLD) monomer (VMC) researched. Then, influence methods compared same fineness. Test results showed that in mill is more concentrated coarser particles with grinding, which provides favorable conditions for subsequent beneficiation. In addition, range...
The improvement of vitrinite content in low-rank coal can enhance liquefaction efficiency. In this work, an innovative rotary triboelectric separator (RTS) was used to enrich the macerals coal. effects friction wheel speed (A), separation voltage (B), and feed rate (C) RTS on enrichment were investigated, interactions three factors explored via response surface method. By established model, all have significant recovery Rv, interaction between AC is stronger than AB BC. Taking maximum value...
This paper studies particle motion and flow field characteristics with fly ash as an example combine the experiments to analyze separation process of rotary triboelectric separator in detail. Under boundary reference conditions 22 kV plate voltage, 3 m/s feed flow, 1815 r/min (189.95 rad/s) friction wheel speed, it simulated single-particle group movement different voltages feeding positions. Simulation shows that particles may collide a cause serious mixing when voltage is higher. The...
CFD simulation is carried out for the internal flow field of rotary triboelectric separator by Fluent software, analyzing effects three factors on airflow inside separator, including feeding speed, friction wheel and assistant speed. The best referenced conditions are obtained single separation test: plate voltage 24 kV, feed frequency 22 Hz, speed 189.95 rad/s. Simulation results show 4 m/s a cutoff point influence maximum velocity in chamber, sorting effect becomes worse when air greater...
As the mining of large flake graphite is approaching exhaustion, fine becomes main resource for future. The ores in Heilongjiang area China are very representative China. Based on a amount Luobei, Heilongjiang, China, characteristics have been studied by process mineralogical analysis. study shows that content raw ore samples Luobei area, about 16.81%, and most exists form flakes less than 150 μm. In addition, reason why minerals difficult to liberate interlocked with Muscovite. Some...