9^th International Conference and Expo on Separation Techniques September 13-14, 2018 Zurich, Switzerland

Yadong Zhang is a first year PhD student at China University of Mining and Technology, and his Major is in Mineral Processing Engineering. He has published two articles in Powder Technology and Journal of China Coal Society, respectively

Dry beneficiation of fine coal needs to be upgraded because of the poor efficiency of separation technology. Under this condition, it is extremely urgent to develop an advanced process in the field of fine coal cleaning. The vibrated fluidized bed(VFB) that introduces an external vibration force to the conventional fluidized bed was applied as a successful clean dry coal preparation technology. The pressure fluctuation signals in the VFB were measured by the pressure transmitters and the hidden information in the pressure signals of the VFB was extracted with the mathematical tools in both time and frequency domains. The objective of this work was to investigate the changes of the pressure signal components in different operating factors and to evaluate the separation performance of fine coal in a Φ110 mm×800 mm VFB with the -0.3+0.074 mm magnetite powder under optimum operating condition. The experimental results indicated that the energy and power spectra of the pressure signals were obtained. The gas velocity, frequency and amplitude of the vibration have an significant effect on the pressure fluctuation of the VFB, the gangue of high ash could be removed by a VFB and got clean coal whose ash content reached 10.57% and reduced by about 24.00% compared with 34.57% of raw coal and gangue ash reached 55.00% above under the optimal technique.

Bo Lv is studying for a PhD from China University of mining and technology. He is devoted to researching dry separation technology and application. He has published more than four papers in reputed journals in china. Zhenfu Luo is a Professor, Doctoral tutor and Editor of the Journal of China University of Mining & Technology, mainly engaged in dry mineral processing theory and technology development, fluidized dry sorting technology and equipment research. He has published more than 70 papers in reputed journals.

Adopting air dense medium fluidized bed, fine coal particles in the size range of 3-6 mm were separated in experimental study. The experimental results showed that most of the high density of fine coal were accumulation in the lower part of the bed, while low-density fine coal tend to gather in the upper bed. This increase was mainly due to plasmid degree in composition and fluidization conditions to achieve the minimum separation of particles, resulting in deterioration of separation efficiency.Currently the air dense medium fluidized bed dry coal preparation technology has been successfully achieved for 50~6 mm grain size sorting of coal, But it is still not clear for 6~0 mm fine coal. It is necessary to fine-grained level for dry separation of test.

The throughput of pyrite extraction from coal using the conventional magnetic separation method can be effectively improved by increasing the magnetic susceptibility of pyrite. The electromagnetic characteristics and absorption response of fine high-sulfur coal were studied to evaluate the strengthening effect of microwave treatment on the magnetic susceptibility of pyrite. In actual production, the microwave treated pyrite was affected by oxygen and water vapor in the air, so it is necessary to consider the effects of various factors on the magnetic enhancement after microwave pretreatment. Magnetism of fine coal stored under room temperature in air for long-term will become weaker, due to the formation of pyrrhotite. Also, the pyrite is not stable in air during the microwave pretreatment process. Due to the porosity of fine coal, when it is placed in air, oxidation reaction occurs between a small amount of oxygen and coal pyrite. This is the reason for the decrease in the specific magnetic susceptibility and the weakening of the magnetic behavior of fine coal. Analysis of different sputtering times indicates the different depths from the surface. During the microwave treatment, pyrite Fe2 (SO4)3 and ferrous sulfate FeSO4 are mainly present on the surface of pyrite, and surface oxidation takes place. The relative content of Fe2 (SO4)3 in the treated coal is higher than that of FeSO4.

Mansoureh Kermani began her PhD studies at Isfahan University of Technology, Isfahan, Iran in 2014. She is currently a Visiting Researcher at the Faculty of Chemistry of the Gdansk University of Technology, Poland. She is the author of two scientific papers.

With the aim of contributing to the development and improvement of microextraction techniques, our research group proposed for the first time a new configuration relying on the principles of stir-bar sorptive extraction (SBSE), in which an expanded iron sheet was used instead of a glass-enveloped magnet as the extraction phase. Although SBSE, is a wellestablished microextraction technique but it has a limitation in flexibility for selection of sorbent that can be coated over the glass magnetic stir bar. Also, coating procedure involves several tedious steps in order to expose the maximum number of surface silanol groups for allowing linkage of sorbent to the surface. In this work, we have demonstrated the electrosynthesis of polypyrrole coating on a piece of expanded iron sheet, as a self-stirring extraction setup. This new device not only solves above said problem but also increases an effective surface area of the sorbent exposed to sample solution through its configuration.The electrodeposition as a coating procedure is flexible and easily controlled by adjusting the electropolymerization conditions. Moreover, the device offers an inexpensive alternative for SBSE production, a higher sensitivity, improved precision and mechanical stability. The surface of the device was characterized by using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) techniques. The performance of the device prepared was evaluated for trace determination of chlorpyrifos in different real samples using directly thermally desorption (TD) into an ion mobility spectrometry (IMS). The effects of various parameters affecting the extraction efficiency were studied, simultaneously.

Jee Young Kim has completed her PhD from Saga University, Japan in 2015 and Postdoctoral studies from Pusan National University, South Korea. Her research interest lies on interfacial behavior and solvent extraction kinetics with various types’ calix [4] arene derivatives.

The solvent extraction kinetics of Ag (I) with methyl ketonic p-tert-octylcalix [4] arene as a hydrophobic extractant has been studied using a modified Lewis cell system. The effects of parameters affecting the extraction efficiency such as stirring speed, temperature, and Ag (I) concentration were investigated. The initial extraction efficiency was rapidly increased as the stirring speed increased to 170 rpm, then a plateau in the efficiency occurred, which represents the crossover point between diffusion and chemical reaction control at the liquid-liquid interface. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic.

Pollution of aquatic environment with heavy metal ions has become one of the modern man’s preoccupations. Thus, the present study reports the sorption characteristics of Bi3+ from aqueous iodide solution using 1,10-phenanthroline impregnated polyurethane foam (PUF) as a low cost and effective solid phase extractor (SPE). Batch mode of separation was used for studying the operational parameters such as adsorbent dose, solution pH, initial analyte concentration and contact time. The equilibrium data fitted well with pseudo-second-order kinetic model (R2 >0.99). Thermodynamic studies showed that the retention step was exothermic, and spontaneous in nature. The results indicated that the developed sorbent provides an effective and economical approach in highly reducing or almost eradication Bi3+ from the aqueous sol. The method was successfully applied for the analysis of Bi3+ in real tap water samples.

Wei Tang is currently pursuing his Master's degree at Beijing Normal University. His research direction is in the development and utilization of sea ice resources.

Desalinating sea ice to obtain freshwater is a new way to solve the water shortage. Gravitational desalination and centrifugal desalination are important methods for desalination of sea ice. Microwave heating has a significant effect on improving salt-water separation efficiency, but the effect on desalination methods is still unclear. In our research, we studied the effect of microwave power and heating time on gravitational desalination, and four factors of the particle size of ice, initial ice temperature, relative centrifugal force and centrifugation time were selected for centrifugal desalination by microwave heating (CDBMH). For gravitational desalination combined with microwave heating, the results showed that the desalination rate of sea ice is the highest after 2–4 min, and sea ice can rapidly melt brines with higher salinities at lower microwave energies.But for centrifugal desalination, with the decrease of the particle size of ice, the increase of initial ice temperature, relative centrifugal force and centrifugation time, the desalination rate showed an upward trend, while the water yield rate and the salinity of the melted water gradually decreased. As a result of the CDBMH process, the desalination rate was 93.3%, and the water yield rate was 72.4%, and the salinity of the melted water was 0.4%.