Composite SiO2-ZrO2 of the side results of zirconium oxychloride (ZOC) processing

2021 ◽  
Author(s):  
Kharistya Rozana ◽  
Muzakky
Keyword(s):  
Zirconium Oxychloride

scholarly journals A novel green nonaqueous sol-gel process for preparation of partially stabilized zirconia nanopowder

2017 ◽  
Vol 11 (3) ◽  
pp. 220-224 ◽  
Author(s):  
Guo Feng ◽  
Weihui Jiang ◽  
Jianmin Liu ◽  
Quan Zhang ◽  
Qian Wu ◽  
...  
Keyword(s):  
Bending Strength ◽  
Sol Gel ◽  
Sintered Sample ◽  
Zirconium Oxychloride ◽  
Bet Surface Area ◽  
Nanometer Scale ◽  
Stabilized Zirconia ◽  
Zirconia Powder ◽  
Sol Gel Process ◽  
Sintering Behaviour

A novel green nonaqueous sol-gel process was developed to prepare 3mol% Y2O3-doped ZrO2 nanopowder from zirconium oxychloride and without need for washing of the obtained particles. It was shown that highly dispersive nanometer-scale zirconia powder with the particle size of 15-25 nm and BET surface area of 41.2m2/g can be prepared. The sintering behaviour was also investigated. Density of the translucent body sintered at 1400?C is 98.7 ? 0.3% of its theoretical density and the surface and cross section areas are dense without holes or other defects. The bending strength of the sintered sample is 928 ? 64MPa.

ChemInform Abstract: A Green Strategy to Prepare Warfarin-Like Compounds Catalyzed by Zirconium Oxychloride.

ChemInform ◽  
2015 ◽  
Vol 46 (23) ◽  
pp. no-no
Author(s):  
Saeed Khodabakhshi ◽  
Masoud Khaleghi Abbasabadi ◽  
Mojtaba Baghrnejad ◽  
Farzaneh Marahel
Keyword(s):  
Zirconium Oxychloride ◽  
Green Strategy

scholarly journals Radionuclide Transfer in the Zirconium Oxychloride Production Process and the Radiation Effect in a Typical Chinese Enterprise

2019 ◽  
Vol 11 (21) ◽  
pp. 5906
Author(s):  
Shoulong Xu ◽  
Qifan Wu ◽  
Xiaogang Li ◽  
Feng Yuan ◽  
Liangying Tu
Keyword(s):  
Wastewater Treatment ◽  
Production Process ◽  
Effective Dose ◽  
Radiation Effect ◽  
Wastewater Treatment Plants ◽  
Raw Materials ◽  
Zirconium Oxychloride ◽  
Manufacturing Enterprises ◽  
Study Results ◽  
Zircon Sand

The radiation impact on the environment from naturally-occurring radioactive materials in zircon sand is an important issue for zirconium product manufacturing enterprises. In this paper, a typical oxychloride production enterprise has been taken as an example to study the radiation effect and environmental pollution during the whole production process. The transfer and enrichment of radionuclides in zircon sand was studied by analyzing their concentrations in samples, such as products and wastes, which were sampled from every studied workshop, so that the dose rate in the environment and typical facility surfaces of each workshop could be measured. The study results show that the transfer and enrichment of radionuclides occur mainly in workshops of acidification, dissolution, concentration and crystallization. Silicon slag adsorbed some radionuclides, but most of the radionuclides in raw materials are transferred and enriched in waste acid by the concentration and crystallization process. Sludge and wastewater still contain a large quantity of radionuclides after treatment by wastewater treatment plants. This results in a significant increase in U-238 and Th-232 concentrations in river water near the main outlet. The average effective dose of all employees in the studied enterprises was 0.94 mSv, and workers from the wastewater treatment plants had the largest annual effective dose at 11 mSv.

Synthesis of Ultra-Fine ZrB2 Powder by Borothermal Reaction under High Heating Rate

2009 ◽  
Vol 66 ◽  
pp. 77-80 ◽  
Author(s):  
Ge Sun ◽  
Hao Wang ◽  
Wei Min Wang ◽  
Yu Cheng Wang ◽  
Zheng Yi Fu
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Heating Rate ◽  
Zirconium Oxychloride ◽  
Reduction Reaction ◽  
Average Crystalline Size ◽  
High Heating Rate ◽  
Heat Treated ◽  
High Heating ◽  
Borothermal Reduction

Ultra-fine zirconium diboride (ZrB2) powders have been synthesized by borothermal reduction reaction, using zirconium oxychloride (ZrOCl2•8H2O) as the precursors of zirconia. The thermodynamic variation in the amorphous ZrO2-B system was studied by thermogravimetric and differential thermal analysis (TG-DTA). The precursors containing amorphous ZrO2 and B were heat-treated under a high heating rate. It is shown that the borothermal reaction can be completed at a relatively low temperature (~950 °C) and short duration (~5 min) under a heating rate of 200 °C/min. The synthesized powders have an average crystalline size of 300 nm with oxygen content less than 2.62 wt%.

scholarly journals Thermostimulated Sol–Gel Transition in Suspensions of Sulfate-Zirconium Oxychloride

1997 ◽  
Vol 30 (5) ◽  
pp. 750-754 ◽  
Author(s):  
L. A. Chiavacci ◽  
C. V. Santilli ◽  
S. H. Pulcinelli ◽  
A. F. Craievich
Keyword(s):  
Inner Core ◽  
Sol Gel ◽  
Fractal Dimensionality ◽  
Zirconium Oxychloride ◽  
Heating And Cooling ◽  
A Value ◽  
Sol Gel Transition ◽  
Average Size ◽  
Small Clusters ◽  
Gel Transition

The sol-gel transition of an aqueous solution of zirconium oxychloride modified by sulfuric acid (Zr:S 3:1) has been studied by small-angle X-ray scattering (SAXS) performed in situ during one cycle of heating and cooling between 298 and 358 K. The experimental SAXS curves exhibit three regions, at small, medium and high q values, characteristic of the Guinier, 'fractal' and Porod regimes, respectively. The value of 5.5 Å for the radii of the primary particles, obtained from the cross over of the Porod and fractal regimes, is consistent with the size of the inner core of the polynuclear Zr18O4(OH)38.8(SO4)12.6.33H2O molecule. These molecules aggregate as small clusters (31 Å) of fractal structure, with a dimensionality D = 2.16 in the sol. The value of the fractal dimensionality, which is characteristic of ideal branched polymers, decreases during heating, attaining a value of 2.0, characteristic of swollen polymers. Above the critical temperature (329 K), the average size of aggregates increases abruptly to 200 Å and the fractal dimensionality decreases to D = 1.75, this value being characteristic of a cluster-cluster aggregation process.

Highly selective zirconium oxychloride modified Pd/C catalyst in the hydrodechlorination of dichlorodifluoromethane to difluoromethane

2002 ◽  
Vol 3 (4) ◽  
pp. 145-149 ◽  
Author(s):  
J. Krishna Murthy ◽  
S. Chandra Shekar ◽  
V. Siva Kumar ◽  
K.S. Rama Rao
Keyword(s):  
Zirconium Oxychloride

Study of Hydrothermal Synthesis of Ce0.67Zr0.33O2 Nanorods and Catalytic Property to CO

2011 ◽  
Vol 347-353 ◽  
pp. 615-620
Author(s):  
Ying Jia ◽  
Tian Tian Liu ◽  
Cheng Luo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Catalytic Oxidation ◽  
Zirconium Oxychloride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Three Way Catalyst ◽  
Scanning Electron

Ce0.67Zr0.33O2 (CZ) nanorods are successfully synthesized by glycol-assisted hydrothermal method using zirconium oxychloride, cerium nitrate and urea, with the presence of sodium hypochlorite. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectra. The catalytic oxidation characters about Pd/CZ three-way catalyst (TWC) prepared with different loads of Pd are also investigated. The results show that the as-prepared Pd/CZ has excellent catalytic oxidation character to CO.

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