Decomposition process of zircon sand concentrate with CaO-NaOH  

作　　者：Zhang, Jiandong  Wang, Lijun  Jiang, Dongmin 

机构地区：[1]Division of Mineral Resources,Metallurgy & Materials,General Research Institute for Nonferrous Metals,Beijing 100088,China [2]Zhejiang Zr-Valley Science & Technology Co.Ltd,Zhejiang 313220,China

出　　处：《Rare Metals》2012年第4期410-414,共5页稀有金属（英文版）

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 Na_2O,which was generated by the reaction of CaO and Na_4SiO_4,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：ZIRCON DECOMPOSITION calcium oxide sodium hydroxide TG-DTA 

分 类 号：O614.41[理学—无机化学]