The Experts below are selected from a list of 459 Experts worldwide ranked by ideXlab platform
Ran Liu - One of the best experts on this subject based on the ideXlab platform.
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a two step zircon decomposition method to produce Zirconium Oxychloride alkali fusion and water leaching
Rare Metals, 2020Co-Authors: Jing Song, Jingfei Fan, Jingchong Liu, Ran LiuAbstract:In this work, a two-step zircon method to produce Zirconium Oxychloride was introduced, and the alkali fusion technique with NaOH and water leaching process were investigated. The effects of the operating conditions on the decomposition of zircon were determined, and the optimal conditions are as follows: alkali/zircon mass ratio of 0.7 at the first step and 0.6 at the second step (0.7 + 0.6), fusion temperature of 700 °C and fusion time of 0.5 h at the first step and 0.5 h at the second step (0.5 + 0.5 h). Under these conditions, the decomposition alloy of zircon sand can reach 97.25 %. In the fusion process of zircon sand, the products of first step are mainly Na2ZrO3 and ZrSiO4, the products of second step are Na2ZrO3 and Na2SiO3, and the diffraction peaks of Na2ZrSiO5 are not observed. The conditions of water leaching process were investigated as well, and the optimal conditions are as follows: liquid–solid ratio of 5:1, leaching time of 0.5 h, leaching temperature of 50 °C and leaching three times. Under these conditions, the contents of leaching products SiO2 and Na2O are 3.51 % (40 % ZrO2) and 4.46 % (40 % ZrO2), respectively. The crystal phase structures of Na2ZrO3 and Na2SiO3 are formed in water leaching process.
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removal of silicon in acid leaching and flocculation processes during Zirconium Oxychloride octahydrate production
Ceramics International, 2014Co-Authors: Jing Song, Ran Liu, Tianyan Xue, Yu WangAbstract:The efficiency of silicon removal technology by acid leaching and flocculation during Zirconium Oxychloride octahydrate (ZrOCl2 center dot 8 H2O) production has been improved. The optimum conditions of acid leaching were found to be as follows: transiton material, 300 g; HCl (6 mol/L), 600 mL; leaching time, 4 h; and leaching temperature, 100 degrees C. The nonionic polyoxyethylene lauryl ether (AEO9) was adopted as the flocculant. The optimum flocculation conditions were found to be as follows: temperature, 40 degrees C; flocculant amount, 10 ml (concentration 1%); time, 1 h. The Zirconium Oxychloride solution after purification contained 36 ppm SiO2 and 160 g/L ZrOCl2. The polymerization and flocculation mechanisms of silicic acid were analyzed. Results of Fourier-transform infrared, scanning electron microscopy, nuclear magnetic resonance, and Brunauer-Emmett-Teller analyses showed the main transformation and properties of the products in the acid leaching and flocculation processes. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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analysis of water leaching and transition processes in Zirconium Oxychloride octahydrate production
Ceramics International, 2014Co-Authors: Ran Liu, Jing SongAbstract:The water leaching and transition process in manufacturing Zirconium Oxychloride octahydrate was examined. Results from X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectra showed that most of the soluble sodium silicate was dissolved and the residue hydrolyzed into H2SiO3 during the water leaching process. In addition, Na+ from sodium zirconate (NaZrO3) in the interlayer was removed during the first and second water leaching and the in-host layer was distinguished in the third water leaching. This process resulted in the hydrolysis of NaZrO3 into ZrO(OH)(2). Results from the scanning electron microscopy (SEM), FT-IR spectra, nuclear magnetic resonance (NMR) and XRD of the transition process showed the main reaction and properties of the products at different pH values. Na2ZrSiO5 reacted with HCl at pH=7, producing ZrO(OH)(2) SiO2 and NaCl. ZrO(OH)(2) SiO2 partially reacted with HCl, forming ZrOCl2 and H2SiO3 with a decrease in pH. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Jing Song - One of the best experts on this subject based on the ideXlab platform.
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a two step zircon decomposition method to produce Zirconium Oxychloride alkali fusion and water leaching
Rare Metals, 2020Co-Authors: Jing Song, Jingfei Fan, Jingchong Liu, Ran LiuAbstract:In this work, a two-step zircon method to produce Zirconium Oxychloride was introduced, and the alkali fusion technique with NaOH and water leaching process were investigated. The effects of the operating conditions on the decomposition of zircon were determined, and the optimal conditions are as follows: alkali/zircon mass ratio of 0.7 at the first step and 0.6 at the second step (0.7 + 0.6), fusion temperature of 700 °C and fusion time of 0.5 h at the first step and 0.5 h at the second step (0.5 + 0.5 h). Under these conditions, the decomposition alloy of zircon sand can reach 97.25 %. In the fusion process of zircon sand, the products of first step are mainly Na2ZrO3 and ZrSiO4, the products of second step are Na2ZrO3 and Na2SiO3, and the diffraction peaks of Na2ZrSiO5 are not observed. The conditions of water leaching process were investigated as well, and the optimal conditions are as follows: liquid–solid ratio of 5:1, leaching time of 0.5 h, leaching temperature of 50 °C and leaching three times. Under these conditions, the contents of leaching products SiO2 and Na2O are 3.51 % (40 % ZrO2) and 4.46 % (40 % ZrO2), respectively. The crystal phase structures of Na2ZrO3 and Na2SiO3 are formed in water leaching process.
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The environmental sustainability of synthetic wollastonite using waste from Zirconium Oxychloride production
Journal of Cleaner Production, 2018Co-Authors: Yu Wang, Guihua Hou, Guangye Wei, Xinguo Xi, Jing Song, Qiang Guo, Jingkui QuAbstract:Abstract A reasonable and economic process to achieve the comprehensive utilization of waste from production of Zirconium Oxychloride would benefit sustainable development of Zirconium industries and reduce environmental pollution. In this paper, wollastonite was prepared from spent caustic liquor and Zirconium-containing silicon slag at low temperature. The effects of CaO/SiO 2 mole ratio, reaction temperature, reaction time, and rotation rate on the crystallization and morphology of wollastonite were systemically investigated. The optimal conditions for desilication were confirmed as a CaO/SiO 2 mole ratio of 1.0, a reaction temperature of 90 °C, a desilication time of 60 min, and a rotation rate of 200 r/min. Wollastonite was subsequently prepared by calcination of the obtained calcium silicate hydrate at 1000 °C for 1.0 h. The developed process achieved good performance of wollastonite and alkali liquor with a low silicate content, which met the standard of an industrial-grade product.
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controlling the formation of na2zrsio5 in alkali fusion process for Zirconium Oxychloride production
Advanced Powder Technology, 2016Co-Authors: Jing Song, Tao Qi, Changqiao Zhang, Jingkui QuAbstract:In the alkali fusion process for the production of Zirconium Oxychloride, the formation of the water insoluble by-product, Na2ZrSiO5, largely affects NaOH recovery and results in the formation of silicon slags. Thus, controlling Na2ZrSiO5 formation is necessary. In this paper, we studied the effects of roasting temperature, NaOH/zircon mole ratio, and particle size of zircon sand on Na2ZrSiO5 formation. The optimum reaction parameters, when the roasting time was 1 h, were as follows: >= 95 mu m average particle size of zircon sand, 6:1 NaOH/zircon mole ratio, and 750 degrees C roasting temperature. To avoid an uneven roasting temperature during alkali fusion, the use of a rotary kiln reactor is recommended. The amount of Na2ZrSiO5 was significantly decreased under these optimum conditions, and the content of Na2O was reduced from 7.049% to only 2.21% after three water-leaching cycles. (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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removal of silicon in acid leaching and flocculation processes during Zirconium Oxychloride octahydrate production
Ceramics International, 2014Co-Authors: Jing Song, Ran Liu, Tianyan Xue, Yu WangAbstract:The efficiency of silicon removal technology by acid leaching and flocculation during Zirconium Oxychloride octahydrate (ZrOCl2 center dot 8 H2O) production has been improved. The optimum conditions of acid leaching were found to be as follows: transiton material, 300 g; HCl (6 mol/L), 600 mL; leaching time, 4 h; and leaching temperature, 100 degrees C. The nonionic polyoxyethylene lauryl ether (AEO9) was adopted as the flocculant. The optimum flocculation conditions were found to be as follows: temperature, 40 degrees C; flocculant amount, 10 ml (concentration 1%); time, 1 h. The Zirconium Oxychloride solution after purification contained 36 ppm SiO2 and 160 g/L ZrOCl2. The polymerization and flocculation mechanisms of silicic acid were analyzed. Results of Fourier-transform infrared, scanning electron microscopy, nuclear magnetic resonance, and Brunauer-Emmett-Teller analyses showed the main transformation and properties of the products in the acid leaching and flocculation processes. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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analysis of water leaching and transition processes in Zirconium Oxychloride octahydrate production
Ceramics International, 2014Co-Authors: Ran Liu, Jing SongAbstract:The water leaching and transition process in manufacturing Zirconium Oxychloride octahydrate was examined. Results from X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectra showed that most of the soluble sodium silicate was dissolved and the residue hydrolyzed into H2SiO3 during the water leaching process. In addition, Na+ from sodium zirconate (NaZrO3) in the interlayer was removed during the first and second water leaching and the in-host layer was distinguished in the third water leaching. This process resulted in the hydrolysis of NaZrO3 into ZrO(OH)(2). Results from the scanning electron microscopy (SEM), FT-IR spectra, nuclear magnetic resonance (NMR) and XRD of the transition process showed the main reaction and properties of the products at different pH values. Na2ZrSiO5 reacted with HCl at pH=7, producing ZrO(OH)(2) SiO2 and NaCl. ZrO(OH)(2) SiO2 partially reacted with HCl, forming ZrOCl2 and H2SiO3 with a decrease in pH. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Liang Shen - One of the best experts on this subject based on the ideXlab platform.
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Transparent poly(methyl methacrylate)/silica/ zirconia nanocomposites with excellent thermal stabilities, Polym Degrad Stabil
2020Co-Authors: Haitao Wang, Wei Zhong, Liang ShenAbstract:Abstract Nanocomposites from poly(methyl methacrylate) (PMMA), silica (SiO 2 ) and zirconia (ZrO 2 ) were prepared using a novel nonhydrolytic sol-gel process. Silicic acid and Zirconium Oxychloride (ZrOCl 2 Á8H 2 O) were used as the precursors of SiO 2 and ZrO 2 , respectively. FT-IR and SEM results showed that nanometre-scaled SiO 2 /ZrO 2 particles were uniformly distributed in and covalently bonded to the PMMA host matrix without macroscopic organiceinorganic phase separation, which was also confirmed by solvent extraction experiments. It was found that the transmittance of the nanocomposite films in the visible region remained above 95% even at 20 wt% inorganic content and increased proportionally with decreasing inorganic content. The thermal stability and the thermal decomposition kinetics of the composites were studied. The results indicated that the activation energy (E a ) of the thermal decomposition of PMMA main chains in the composites was increased due to the addition of inorganic moieties. This kind of composite material may have the potential for applications in optical devices
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transparent poly methyl methacrylate silica zirconia nanocomposites with excellent thermal stabilities
Polymer Degradation and Stability, 2005Co-Authors: Haitao Wang, Wei Zhong, Liang ShenAbstract:Nanocomposites from poly(methyl methacrylate) (PMMA), silica (SiO2) and zirconia (ZrO2) were prepared using a novel nonhydrolytic sol-gel process. Silicic acid and Zirconium Oxychloride (ZrOCl28H2O) were used as the precursors of SiO2 and ZrO2, respectively. FT-IR and SEM results showed that nanometre-scaled SiO2/ZrO2 particles were uniformly distributed in and covalently bonded to the PMMA host matrix without macroscopic organiceinorganic phase separation, which was also confirmed by solvent extraction experiments. It was found that the transmittance of the nanocomposite films in the visible region remained above 95% even at 20 wt% inorganic content and increased proportionally with decreasing inorganic content. The thermal stability and the thermal decomposition kinetics of the composites were studied. The results indicated that the activation energy (Ea) of the thermal decomposition of PMMA main chains in the composites was increased due to the addition of inorganic moieties. This kind of composite material may have the potential for applications in optical devices. 2004 Elsevier Ltd. All rights reserved.
Daniella Regina Mulinari - One of the best experts on this subject based on the ideXlab platform.
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chemical modification of palm fibres surface with Zirconium Oxychloride
Web Science, 2013Co-Authors: Giulia Araujo Martins, Paulo Pereira, Daniella Regina MulinariAbstract:Chemical modification of natural fibres has been carried out using different methods for such purposes as reinforcement in polymer matrices and heavy metals adsorption. In this work, palm fibres were modified by Zirconium Oxychloride in situ. The palm fibres that had been chemically modified were compared to those in nature using fibres that passed through 20 and 40 mesh screens to evaluate the influence of particle size on modification. Palm fibres were modified with ZrO2.nH2O nanoparticles through the use of Zirconium Oxychloride in an acidic medium in the presence of palm fibres using ammonium solution (1:3) as the precipitating agent. Scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectrophotometry (FTIR), and atomic emission spectrometry with inductively coupled plasma (ICP-AES) were used to characterize the hybrid materials. Results indicated that the particle size of the palm fibres influenced in the modification, because the fibres with smaller particle size had a greater deposition of inorganic material. The ICP technique revealed an increase of 21% nanoparticles ZrO2.nH2O deposited on fibres (40 mesh) when compared to fibres (20 mesh). The diameter of nanoparticles ZrO2.nH2O deposited on fibres was about 50 to 220 nm, as observed by SEM.
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image analysis of modified cellulose fibers from sugarcane bagasse by Zirconium Oxychloride
Web Science, 2010Co-Authors: Daniella Regina Mulinari, T G Cruz, Maria Odila Hilario Cioffi, Herman Jacobus Cornelis Voorwald, M L C P Da Silva, George J M RochaAbstract:Surface modification of natural fibers has been made using different methods. In this paper, cellulose fibers from sugarcane bagasse were bleached and modified by Zirconium Oxychloride in situ. The chemically modified cellulose fibers were compared to those of bleached ones. Cellulose fibers were modified with ZrO(2)center dot nH(2)O nanoparticles through the use of Zirconium Oxychloride in acidic medium in the presence of cellulose fibers using urea as the precipitating agent. The spatial distribution characterization of hydrous Zirconium oxide on cellulose fibers was carried out by combining both processing and image analyses obtained by SEM and statistical methodologies. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TG) were also used to characterize the nanocomposite. Results indicated that ZrO(2)center dot nH(2)O nanoparticles of about 30-80 nm diameter deposited on cellulose fibers were heterogeneously dispersed. (C) 2010 Elsevier Ltd. All rights reserved.
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SURFACE MODIFICATION OF SUGARCANE BAGASSE CELLULOSE AND ITS EFFECT ON MECHANICAL AND WATER ABSORPTION PROPERTIES OF SUGARCANE BAGASSE CELLULOSE/ HDPE COMPOSITES
North Carolina State University, 2010Co-Authors: Daniella Regina Mulinari, Herman J. C. Voorwald, Maria Odila H. Cioffi, George J. Rocha, Maria Lúcia Pinto C. Da SilvaAbstract:Cellulose fibres from sugarcane bagasse were bleached and modified by Zirconium Oxychloride in order to improve the mechanical properties of composites with high density polyethylene (HDPE). The mechanical properties of the composites prepared from chemically modified cellulose fibres were found to increase compared to those of bleached fibres. Tensile strengths of the composites showed a decreasing trend with increasing filler content. However, the values for the chemically modified cellulose fibres/HDPE composites at all mixing ratios were found to be higher than that of neat HDPE. Results of water immersion tests showed that the water absorption affected the mechanical properties. The fracture surfaces of the composites were recorded using scanning electron microscopy (SEM). The SEM micrographs revealed that interfacial bonding between the modified filler and the matrix was significantly improved by the fibre modification
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preparation and properties of hdpe sugarcane bagasse cellulose composites obtained for thermokinetic mixer
Carbohydrate Polymers, 2009Co-Authors: Daniella Regina Mulinari, Maria Odila Hilario Cioffi, Herman Jacobus Cornelis Voorwald, Maria Lucia Pereira Da Silva, Sandra M LuzAbstract:The use of natural fibers as reinforcement for thermoplastics has generated much interest due to their low cost, possibility of environmental protection and use of locally available renewable resources. In this work the mechanical and morphological properties of high density polyethylene/pre-treated and modified residues from sugarcane bagasse cellulose composites were analyzed. Composites were produced by a thermokinetic mixer. The microstructural analyses of fracture surface from composites can be easily evaluated by microscopic techniques. Results showed that the modification of sugarcane bagasse cellulose with Zirconium Oxychloride was successfully accomplished and that this reinforcement material with high density polyethylene showed tensile strength higher than non-modified sugarcane bagasse cellulose. Modification in the sugarcane bagasse cellulose influenced directly in mechanical properties of the composite material. This can be observed by the fracture surface, which showed that modified cellulose sugarcane bagasse improved interfacial adhesion between fiber and matrix.
Xinxin Wang - One of the best experts on this subject based on the ideXlab platform.
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preparation and characterization of mesoporous zirconia made by using a poly methyl methacrylate template
Nanoscale Research Letters, 2008Co-Authors: Guorong Duan, Chunxiang Zhang, Xujie Yang, Xinxin WangAbstract:Superfine powders of poly (methyl methacrylate) (PMMA) have been prepared by means of an emulsion polymerization method. These have been used as templates in the synthesis of tetragonal phase mesoporous zirconia by the sol–gel method, using Zirconium Oxychloride and oxalic acid as raw materials. The products have been characterized by infrared spectroscopy, X-ray diffraction analysis, transmission electron microscopy, N2adsorption-desorption isotherms, and pore size distribution. The results indicate that the average pore size was found to be 3.7 nm.
