Removal of sulfur element from high-sulfur coal by superconducting HGMS technology

Shuai-shuai Han,Su-qin Li,Rui-ming Yang,Chang-qiao Yang,Yi Xing 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.2

Coal is the most abundant fossil fuel on Earth and is used in a wide range of applications. The direct combustion of high-sulfur coal produces a large amount of sulfur dioxide, which is a toxic and corrosive gas. A new superconducting high gradient magnetic separation (HGMS) technology was studied to remove sulfur from high sulfur coal. The magnetic separation concentrate was obtained under the optimum parameters, such as a particle size of -200 mesh, a magnetic field strength of 2.0 T, a slurry concentration of 15 g/L, and a slurry flow rate of 600 ml/min. The removal rate of sulfur is up to 59.9%. The method uses a magnetic field to remove sulfur-containing magnetic material from a pulverized coal solution. It is simple process with, high efficiency, and is a new way.

Locating Structure Directing Agent and Al in CHA: Combined Study of Structure Determination of X-Ray Powder Diffraction and Classical Lattice Energy Calculation

Shuai Chang,박순희,Sung June Cho 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3

Locating the structure directing agent and Al in zeolite CHA has been performed using structure determination of X-ray powder diffraction combined with General Utility Lattice Program (GULP) calculation. Trimethyladamantylammonium ion (TMAdaOH+) and benzyltrimethyl ammonium ion (BTMAOH+), respectively, have been found to fit in the pore, resulting in the formation of high silica zeolite CHA, which shows the superior catalytic performance in abatement of NOx using NH3 in the exhaust gas stream of mobile car. The intimate interaction between the corresponding structure directing agent (SDA) and the counter ion due to the Al substitution in the framework has been characterized using the lattice energy calculation. The difference in the lattice energy of the zeolite CHA prepared with TMAdaOH was large compared to that of the zeolite CHA prepared with BTMAOH, which can be attributed probably to the molecule's size. Thereby, the SDA in the zeolite pore has been located readily and the resulting information can be useful for increasing the understanding in the zeolite formation mechanism and designing novel zeolite.

Remote Sensing Image Fusion Based On IHS and Dual Tree Compactly Supported Shearlet Transform

Chang Duan,Qihong Huang,Xuegang Wang,Shuai Wang,Hong Wang 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5

This paper presents a novel remote sensing image fusion algorithm, which implements the intensity-hue-saturation (IHS) transform on panchromatic sharpening of multispectral data and the dual-tree compactly supported shearlet transform (DT CSST) during fusion. Shearlet transforms can provide almost optimal representation of the anisotropic features of an image. The spatial domain discrete implementation, the compactly supported shearlet transform (CSST), which represents the directions by dilation operations, are selected in the proposed fusion method. Since most of the prominent features of images, such as edges and regions, have limited sizes in the spatial domain, CSST is very suitable for image fusion. However, the conventional CSST is shift-variant, which causes distortions in fused images. With the embedded dual-tree (DT) sturcture in the CSST, the shift-variant properties can be effectively reduced. Combining the IHS transform and the DT CSST, an effective panchromatic and multispectral image fusion method is proposed in this paper. The experiments’ results suggest that the proposed method extract more spatial information from panchromatic images with less lost in spectral consistency compared to other fusion methods which are based on discrete wavelet transform (DWT), à trous wavelet transform, à trous shearlet transform, the dual-tree complex wave transform ( DT CWT), or the Curvelet transform.

Removal of sulfur element from high-sulfur coal by superconducting HGMS technology

Han, Shuai-shuai,Li, Su-qin,Yang, Rui-ming,Yang, Chang-qiao,Xing, Yi The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.2

Coal is the most abundant fossil fuel on Earth and is used in a wide range of applications. The direct combustion of high-sulfur coal produces a large amount of sulfur dioxide, which is a toxic and corrosive gas. A new superconducting high gradient magnetic separation (HGMS) technology was studied to remove sulfur from high sulfur coal. The magnetic separation concentrate was obtained under the optimum parameters, such as a particle size of -200 mesh, a magnetic field strength of 2.0 T, a slurry concentration of 15 g/L, and a slurry flow rate of 600 ml/min. The removal rate of sulfur is up to 59.9%. The method uses a magnetic field to remove sulfur-containing magnetic material from a pulverized coal solution. It is simple process with, high efficiency, and is a new way.

Investigation on purification of α-Fe₂O₃ from zinc smelting iron slag by superconducting HGMS technology

Zhang, Peng,Li, Su-qin,Guo, Zi-jie,Zhang, Chang-quan,Yang, Chang-qiao,Han, Shuai-shuai The Korea Institute of Applied Superconductivity a 2018 한국초전도저온공학회논문지 Vol.20 No.2

Comprehensive utilization of zinc smelting iron slag not only solves environmental problems but also creates huge economic benefits. This study was conducted on the enrichment and recovery of ${\alpha}-Fe_2O_3$ from zinc smelting iron slag by superconducting HGMS technology. Several variables such as slurry flow velocity, slag concentration, magnetic field intensity and the amount of dispersing agent were tested in magnetic separation. In the experiments, obtained optimal magnetic separation parameters were 1.60 T of magnetic flux intensity, 600 mL/min of slurry flow velocity of, 15 g/L of slag concentration of, 0.10 g/L of dispersing agent. Under this condition, the content of ${\alpha}-Fe_2O_3$ was increased from 86.22% to 94.39% that can approach the Chinese national standard requirements (A level) of iron oxide red. It was concluded that using superconducting HGMS technology was an effective method for the purification of ${\alpha}-Fe_2O_3$ from zinc smelting iron slag.

Investigation on purification of α-Fe2O3 from zinc smelting iron slag by superconducting HGMS technology

Peng Zhang,Su-qin Li,Zi-jie Guo,Chang-quan Zhang,Chang-qiao Yang,Shuai-shuai Han 한국초전도.저온공학회 2018 한국초전도저온공학회논문지 Vol.20 No.2

Comprehensive utilization of zinc smelting iron slag not only solves environmental problems but also creates huge economic benefits. This study was conducted on the enrichment and recovery of α-Fe2O3 from zinc smelting iron slag by superconducting HGMS technology. Several variables such as slurry flow velocity, slag concentration, magnetic field intensity and the amount of dispersing agent were tested in magnetic separation. In the experiments, obtained optimal magnetic separation parameters were 1.60 T of magnetic flux intensity, 600 mL/min of slurry flow velocity of, 15 g/L of slag concentration of, 0.10 g/L of dispersing agent. Under this condition, the content of α-Fe2O3 was increased from 86.22% to 94.39% that can approach the Chinese national standard requirements (A level) of iron oxide red. It was concluded that using superconducting HGMS technology was an effective method for the purification of α-Fe2O3 from zinc smelting iron slag.

A Facial Protocol for the Synthesis of Benzofuran Derivatives by the Reaction of o-Hydroxy Aryl Ketone, Amine and Chloroacetyl Chloride

Shuai Xia,Xiu-Hua Wang,Ji-Qiang Liu,Chang Liu,Jian-Bin Chen,Hua Zuo,Yong-Sheng Xie,Wen-Liang Dong,Dong Soo Shin 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.6

A facile and effective method has been developed for the synthesis of a novel series of benzofuran derivatives via N-acylation, O-alkylation and intramolecular condensation reactions, starting from readily available substituted o-hydroxy aryl ketone, and chloroacetyl arylamides. This metal-free transition process is characterized by mild reaction conditions, atom economy, short reaction time and a high yield with a decreased amount of by-products.

Assessing Abdominal Aortic Aneurysm Progression by Using Perivascular Adipose Tissue Attenuation on Computed Tomography Angiography

Zhang Shuai,Gu Hui,Chang Na,Li Sha,Xu Tianqi,Liu Menghan,Wang Ximing 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.10

Objective: Recent studies have highlighted the active and potential role of perivascular adipose tissue (PVAT) in atherosclerosis and aneurysm progression, respectively. This study explored the link between PVAT attenuation and abdominal aortic aneurysm (AAA) progression using computed tomography angiography (CTA). Materials and Methods: This multicenter retrospective study analyzed patients with AAA who underwent CTA at baseline and follow-up between March 2015 and July 2022. The following parameters were obtained: maximum diameter and total volume of the AAA, presence or absence of intraluminal thrombus (ILT), maximum diameter and volume of the ILT, and PVAT attenuation of the aortic aneurysm at baseline CTA. PVAT attenuation was divided into high (> -73.4 Hounsfield units [HU]) and low (≤ -73.4 HU). Patients who had or did not have AAA progression during the follow-up, defined as an increase in the aneurysm volume > 10 mL from baseline, were identified. Kaplan–Meier and multivariable Cox regression analyses were used to investigate the association between PVAT attenuation and AAA progression. Results: Our study included 167 participants (148 males; median age: 70.0 years; interquartile range: 63.0–76.0 years), of which 145 (86.8%) were diagnosed with AAA accompanied by ILT. Over a median period of 11.3 months (range: 6.0–85.0 months), AAA progression was observed in 67 patients (40.1%). Multivariable Cox regression analysis indicated that high baseline PVAT attenuation (adjusted hazard ratio [aHR] = 2.23; 95% confidence interval [CI], 1.16–4.32; P = 0.017) was independently associated with AAA progression. This association was demonstrated within the patients of AAA with ILT subcohort, where a high baseline PVAT attenuation (aHR = 2.23; 95% CI, 1.08–4.60; P = 0.030) was consistently independently associated with AAA progression. Conclusion: Elevated PVAT attenuation is independently associated with AAA progression, including patients of AAA with ILT, suggesting the potential of PVAT attenuation as a predictive imaging marker for AAA expansion.

Conversion Chemistry of Cobalt Oxalate for Sodium Storage

Jo, Chang-Heum,Yashiro, Hitoshi,Yuan, Shuai,Shi, Liyi,Myung, Seung-Taek American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.47

<P>Conversion electrodes, which can realize high capacities by employing the wider valence states of transition metals, are investigated for sodium storage and applied for rechargeable sodium-ion batteries (SIBs). Importantly, this work is a first report for the sodium storage ability and related storage mechanism in oxalate compounds, specifically cobalt oxalate (CoC<SUB>2</SUB>O<SUB>4</SUB>) nanorods. The nanorods are intimately blended with acetylene black powders to achieve sufficient electrical conductivity (∼10<SUP>-3</SUP> S cm<SUP>-1</SUP>). The resulting C-CoC<SUB>2</SUB>O<SUB>4</SUB> electrode delivers an initial capacity of about 330 mA h (g-CoC<SUB>2</SUB>O<SUB>4</SUB>)<SUP>−1</SUP> at a rate of 0.2 C (60 mA g<SUP>-1</SUP>) and preserves 75% of the initial capacity over 200 cycles. A high charge (oxidation) capacity, ∼111 mA h g<SUP>-1</SUP>, was achieved even at 30 C (9000 mA g<SUP>-1</SUP>). This remarkable electrode performance is reported for the first time for metal oxalate compounds tested for Na cells, to the best of our knowledge. X-ray diffraction, transmission electron microscopy, and time-of-flight secondary-ion mass spectroscopy analyses lead to the proposal of a new sodium storage mechanism. For this mechanism, CoC<SUB>2</SUB>O<SUB>4</SUB> is converted into Co metal involving with the creation of Na<SUB>2</SUB>C<SUB>2</SUB>O<SUB>4</SUB> on discharge (reduction), and the Co metal is recovered to CoC<SUB>2</SUB>O<SUB>4</SUB> on charge. The employed electroconducting carbon is likely to provide good electron conduction paths, which enables fast conversion on both discharge and charge. A full cell comprised of the C-CoC<SUB>2</SUB>O<SUB>4</SUB> anode and carbon-coated NaCrO<SUB>2</SUB> cathode exhibits good retention capacity over prolonged cycling, with retention of about 84.7% of the first capacity [107 mA h (g-NaCrO<SUB>2</SUB>)<SUP>−1</SUP>] for 300 cycles, and is active at a rate of 5 C (550 mA g<SUP>-1</SUP>), with a capacity of 79.5 mA h g<SUP>-1</SUP>. This result demonstrates the potential of applying C-CoC<SUB>2</SUB>O<SUB>4</SUB> as an anode material for rechargeable SIBs.</P> [FIG OMISSION]</BR>

A Study on Return and Volatility Spillover in Chinese Stock Market

( Zi Shuai Yang ),( Byoung Ky Chang ),( Tae Yeong Choi ) 국제지역학회 2015 국제지역학회 춘계학술대회 Vol.2015 No.-