Decomposition process of zircon sand concentrate with CaO-NaOH
来源期刊：Rare Metals2012年第4期
论文作者：ZHANG Jiandong a,WANG Lijun a,and JIANG Dongmin b a Division of Mineral Resources,Metallurgy & Materials,General Research Institute for Nonferrous Metals,Beijing ,China b Zhejiang Zr-Valley Science & Technology Co.Ltd,Zhejiang ,China
文章页码：410 - 414
摘 要：The decomposition process for zircon sand concentrate using mixed base of sodium hydroxide partly replaced by calcium oxide was inrestigated.It is found that the decomposition rate of zircon gradually increased with the increase of the reaction temperature and time.The decomposition rate is over 97% with the conditions that CaO/zircon molar ratio is 0.25 ～ 0.75 at 800 ℃ for 1 h.Whereas the decomposition rate decreased when the molar ratio was more than 0.75.Also,thermogravimetry-differential thermal analysis（TG-DTA） and X-ray diffraction（XRD） were used to study the reaction mechanism of zircon decomposition process with CaO-NaOH.The results showed that Na2O,which was generated by the reaction of CaO and Na4SiO4,increased the decomposition rate of zircon owing to its spread to the surface of zircon and played a role in decomposition process.
ZHANG Jiandong a,WANG Lijun a,and JIANG Dongmin b a Division of Mineral Resources,Metallurgy & Materials,General Research Institute for Nonferrous Metals,Beijing 100088,China b Zhejiang Zr-Valley Science & Technology Co.Ltd,Zhejiang 313220,China
摘 要：The decomposition process for zircon sand concentrate using mixed base of sodium hydroxide partly replaced by calcium oxide was inrestigated.It is found that the decomposition rate of zircon gradually increased with the increase of the reaction temperature and time.The decomposition rate is over 97% with the conditions that CaO/zircon molar ratio is 0.25 ～ 0.75 at 800 ℃ for 1 h.Whereas the decomposition rate decreased when the molar ratio was more than 0.75.Also,thermogravimetry-differential thermal analysis（TG-DTA） and X-ray diffraction（XRD） were used to study the reaction mechanism of zircon decomposition process with CaO-NaOH.The results showed that Na2O,which was generated by the reaction of CaO and Na4SiO4,increased the decomposition rate of zircon owing to its spread to the surface of zircon and played a role in decomposition process.
关键词：
