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Recent advances in catalytic filters for integrated removal of dust and NOx from flue gas:fundamentals and applications

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resources Chemicals and Materials 2022年第3期1卷 275-289页

作者： Changming Li Lin Huangfu Jianling Li Shiqiu Gao Guangwen Xu Jian Yu State Environmental Protection Key Laboratory of Food Chain Pollution Control School of Ecology and EnvironmentBeijing Technology and Business UniversityBeijing 100048China. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co.LtdPanzhihua 617000China State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China. School of Chemical Engineering Shenyang University of Chemical TechnologyShenyang 110142LiaoningChina

Catalytic filters including catalytic bag filters and catalytic filter candles, which couple the filters with denitrification catalysts to obtain the ability to simultaneously remove SOx, NOx and dust, have become the promising applied technology for the integrated flue gas treatment because of their huge advantages in reducing the initial investment, floor occupancy and maintenance cost. In this review, we will summarize the recent advances in the development of catalytic filters in terms of their process principles, filter material, denitrification catalysts, structure-function relationships and industrial applications. Moreover, suggestions about the current challenges and future opportunities are also given from the viewpoints of catalysts and filter material design, catalytic filter preparation methods, and their poisoning and regeneration, etc. With the further development of theory and engineering research, the extensive industrial application of catalytic filters in the field of multiple pollutants flue gas treatment is highly anticipated in the future.

关键词： Catalytic filter candles Catalytic bag filters Integrated flue gas treatment Industrial application

Research on Mixer Parametric Modeling System Based on Redevelopment of ANSYS

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Research on Mixer Parametric Modeling System Based on Redeve...

2015年第三届机械与材料工程亚洲会议

作者： Zheng Bin KeLun Tang PanGang Group Research Institute Co. Ltd.State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Department of Electromechanical Engineering Sichuan University of Science & Engineering

In this paper, the mixer parametric modeling system software was developed by using VB which was taken as the foreground development program, and the paper combined with ANSYS software to create the finite element model of mixer blade and cylinder for the following numerical simulation of the flow field and parameter optimization of mixer. The software user interface was developed by VB and the pre-process model was created by invoking APDL of ANSYS in background. Therefore, the operation of modeling, meshing, component-building of mixer blade and cylinder were completed by using APDL and the graphic and text were outputted and displayed on the mixer parametric modeling system user interface which was developed by VB. Practice proved that it is convenient to modify the mixer solid model created by the parametric design language of ANSYS due to the similar structure.

关键词： Research on Mixer Parametric Modeling System Based on Redevelopment of ANSYS

Investigation on the dual influence of pansteel pulverized coal combustion process by coal quality and particle size

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Investigation on the dual influence of pansteel pulverized c...

Materials Science and Technology Conference and Exhibition 2013, MS and T 2013

作者： Li, Fengguang Zhang, Jianliang Qi, Chenlin Pang, Qinghai Rao, Jiating Ma, Chao School of Metallurgical and Ecological Engineering University of Science and Technology Beijing No.30 Xueyuan Road Haidian District Beijing 100083 China PanGang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization No.90 Taoyuan Street East District Panzhihua City Sichuan 61700 China

ISBN: (纸本)9781629933092

Effect of quality and particle size distribution on Pansteel pulverized coal combustion process was analyzed, pulverized coal combustion process was divided into three phases, early stage, intermediate phase and final phase, which were represented by the loss ratio of 500°C, 600°C and 700°C respectively. Particle size of pulverized coal was divided into three levels, X10, X50 and X90 which respectively accounted for 10%, 50% and 90% of total pulverized coal weight. Following conclusions were obtained: Pulverized coal combustion in early stage had nothing to do with particle size, but the content of volatile. Influence of volatile on lean coal was greater than washed coal. With the proceeding of reaction, particle size started to affect the combustion property of pulverized coal. Combustion of ultrahigh ash content is restricted by neither volatile nor particle size. Combustion of blended coal was complicated. Volatile of lean coal volatilized at first, then volatilized volatile and medium particle size v burned. Big particle size pulverized coal of washed coal was finally burned. Copyright © 2013 MS&T'13®.

关键词： Particle size

Advanced Steelmaking Technology Combined the Extraction of V and Cr from vanadium-Chromium Hot Metal

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Advanced Steelmaking Technology Combined the Extraction of V...

2018年可持续发展炼钢技术国际研讨会

作者： Lian Chen Yangzhou Li Bing Xie Jian Wang Senxiang Yang Jiang Diao Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization College of Materials Science and Technology Chongqing University Pangang Group Panzhihua Steel & Vanadium Co.Ltd.

In this work, the extraction of V and Cr from Hongge vanadium-titanium magnetite ore and the semi-steelmaking were investigated based on mathematical models, laboratory experiments and industrial tests. From the mathematical models, the selective oxidation critical temperature of V and Cr are 1423.53 K and 1480.37 K, respectively. The equilibrium distributions of V and Cr between the slag and metal were lined with the oxide in slag. On this basis, laboratory and industrial tests show that the V and Cr in hot metal can be highly efficiently extracted. The oxidation efficiency of V and Cr reach up to 90 % and 82 %, respectively. VO and CrO content in the vanadium-chromium slag can reach up to 12.57 % and 13.35 %, respectively. The C content in semi-steel is more 3.60 %, while the Cr content in semi-steel is less 0.10 %. After steelmaking, the average of Cr content in steel is 0.05 %.

关键词： V-Cr hot metal converter the extraction of V and Cr Cr-containing semi-steel steelmaking

Enhancement of Dielectric Energy Storage of Bnt-Sbt Ceramics with Ultrafine Grains by Solution Combustion Synthesis

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SSRN 2024年

作者： Long, Qiyu Zuo, Chengyang Xiao, Shihong Du, Fu Chen, Lei Wei, Xianhua State Key Laboratory of Environmental-friendly Energy Materials Southwest University of Science and Technology Mianyang621010 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua University Panzhihua617000 China Xuyu Optoelectronics Co. Ltd Shenzhen518101 China

Bi0.5Na0.5TiO3 (BNT) ferroelectric has been proved to be suitable for dielectric energy storage by incorporating Sr0.7Bi0.2TiO3 (SBT) relaxor ferroelectric, in which high energy efficiency is obtained due to reduced remnant polarization. Herein, BNT-SBT solid solution ceramics were comparatively investigated by the two methods, conventional sintering (CS) and solution combustion synthesis (SCS). The SCS fabricated sample shows an ultrafine average grain size of ~ 0.39 μm, and thus exhibits an ultra-high critical electric field of 548 kV/cm, and a high recoverable energy density of ~ 5.69 J/cm3. Those key energy storage parameters are superior to those of the previous reported samples prepared by the CS method. Meanwhile, a high energy efficiency ~90%, a large power density of ~ 130.44 MW/cm3 (at 320 kV/cm), and an ultrafast discharge time of ~ 61.7 ns are also achieved. The study indicates that grain engineering is an effective way to enhance the dielectric energy storage performance through SCS. © 2024, The Authors. All rights reserved.

关键词： Combustion synthesis

Enhancement of Dielectric Energy Storage of Bnt-Sbt Ceramics with Ultrafine Grains by Solution Combustion Synthesis

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SSRN 2024年

关键词： titanium compounds

A Novel Process for the Separation and Recovery of Phosphorus and Rare Earth Elements from Associated Rare Earth Phosphate Ores

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SSRN 2023年

作者： Xie, Shufang Jiang, Yang Huang, Run Lv, Xiaodong Li, Xianfen He, Xuan School of Materials and Metallurgy Guizhou University Guiyang550025 China Guizhou Provincial University Key Laboratory of High Performance Battery Materials Guiyang550025 China State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Sichuan Panzhihua617000 China

Associated rare earth phosphate ore constitutes a vital strategic resource. However, several challenges are linked to current mainstream wet processing methods, such as the separation of phosphorus elements from rare earth elements (REEs) and resultant environmental pollution. Vacuum reduction technology presents distinct advantages due to its high metal reduction rate and absence of triple waste generation. This study investigates an innovative approach for the separation and recovery of phosphorus and REEs though vacuum carbon thermal reduction of associated rare earth phosphate ores. Theoretical calculations show that at 0.1 Pa and a carbon allocation factor of 1.14, the initial temperature at which Ca5(PO4)3F was reduced to P2 is 800 °C. Temperatures exceeding 1,300 °C led to a small amount of RE3+ being reduced to gaseous REO. This temperature range, spanning 800–1,300°C, was determined as optimal for the separation of phosphorus and REEs. The experimental results confirmed complete phosphorus and REEs separation at 1,300 °C, with 98.61% phosphorus volatilization and 97.68% REEs recovery. The results of the hydrochloric acid leaching reduction specimens showed that the REEs leaching rate was 84.11%. Adjusting acid leach solution to pH 4.3 with sodium carbonate yielded 93.11% REEs precipitation, 5.83% rare earth grade, and 77.64% total REEs recovery. This study advances condensed phosphorus and REEs enrichment, with implications for phosphoric acid and rare earth industries, thus providing a new direction for comprehensive recovery and utilization of associated rare earth phosphate ores. © 2023, The Authors. All rights reserved.

关键词： Rare earth elements

A Novel Method for the Preparation of High-Purity V2o5 Based on Chemical Precipitation and Microemulsion Extraction

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SSRN 2023年

作者： Huang, Jie Feng, Jun-Kai Guo, Yun State Key Laboratory of Vanadium Titanium Resources Comprehensive Utilization Sichun Panzhihua617000 China Chengdu Advanced Metal Materials Industry Technology Research Institute Co. Ltd. Sichuan Chengdu610399 China

High-purity vanadium pentoxide (V2O5) is widely used in aerospace, aviation and vanadium batteries. Its industrial preparation has always been a difficult point in vanadium industry. In this paper, focusing on the technical route of "separation of vanadium and chromium by calcified precipitation → calcium vanadate re-dissolution → microemulsion extraction → alkaline stripping → precipitation → calcination", firstly, calcium vanadate was obtained by calcified selective precipitation to separate vanadium and chromium, then vanadium in calcium vanadate was re-dissolved into aqueous solution with sodium bicarbonate solution as dissolution agent, then vanadium in dissolution solution was extracted by microemulsion, and finally, high-purity V2O5 product was obtained by sodium hydroxide stripping, ammonium salt precipitation and calcination at medium temperature. The optimum conditions of separating vanadium and chromium by calcified precipitation and dissolving out calcium vanadate by sodium bicarbonate have been explored. The optimum conditions of microemulsion extraction and stripping process were studied. The recycling performance of microemulsion has been investigated. Finally, a high-purity V2O5 product was prepared. The proposed novel method can extract vanadium from leaching solution effectively and efficiently and can provide new insights into increasing the preparation level of high-purity V2O5 and thus the metal extraction industry. © 2023, The Authors. All rights reserved.

关键词： Extraction

Excellent Superelasticity Induced by R-Phase in NiTi Alloys Fabricated Via Directed Energy Deposition

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SSRN 2022年

作者： Zhang, Mugong Huang, Ke Li, Xinzhi Fang, Xuewei Jiao, Genghao State Key Laboratory of Mechanical Manufacturing System School of Mechanical Engineering Xi’an Jiaotong University Xi'An710049 China State Key Laboratory of Vanadium Titanium Resources Comprehensive Utilization Pangang Group Research Institute Co. Ltd. Panzhihua617000 China

The R-phase is a common constituent phase in NiTi alloys,its transformation is characterized by low transformation hysteresis and small strain. Although the mechanism of R-phase generation has been extensively studied, the contribution of R-phase to the superelasticity of NiTi alloys still lacks clear proof. In this study, the mechanism of the influence of R-phase on the superelastic properties was discussed by introducing R-phase into the NiTi alloy fabricated by directed energy deposition (DED). The size and spatial distribution of the R-phase were tailored in the NiTi alloy by heat treatment. With the increase of heat treatment time, the size of R-phase gradually decreases while its spatial distribution gradually concentrates. In particular, in cyclic loading experiments under constant strain conditions, an excellent superelastic recovery ratio of 91.52% was observed for the sample after heat treatment. The microstructure of NiTi alloy before and after cyclic loading was analyzed by transmission electron microscopy, and the changing pattern of R-phase and dislocation during cyclic loading was observed. Fundamentally, the enhancement of superelastic properties by introducing R-phase is mainly due to the reduction of dislocations during cyclic loading. These findings provide insightful strategies for the improvement of superelasticity of NiTi fabricated by DED. © 2022, The Authors. All rights reserved.

关键词： Loading