以氧化钙为主要原料从铌钽矿富锆尾矿中制备氧氯化锆

Preparation Zirconium Oxychloride from Concentrated Zr Tails of Nb-Ta Ore by Lime

对铌钽矿的富锆尾矿与碱石灰在一定温度下熔融 ,经过一系列化学处理来制备ZrOCl2 ·8H2 O的方法进行了研究。结果表明 :在用氧化钙熔融法分解富锆尾矿过程中加入少量NaOH可以大大提高锆的浸出率。进而提出了用廉价的生石灰作原料 ,以少量固体氢氧化钠作为反应助剂来分解富锆尾矿 ,生产氯氧化锆的新方法。确定了相应的反应条件为 :NaOH :CaO :尾矿的质量比 =0 .2 :1 .5 :1 ;熔融温度为 1 2 5 0℃ ,时间 2h。

The preparation of ZrOCl 2·8H 2O by fusing concentrated Zr tails of Nb-Ta ore with solid CaO powder and following a series of chemical process were investigated. It was found that the leaching percentage of Zr can be great increased by adding a little NaOH in the fusing process of concentrated Zr tails reacting with CaO . And then, a new method for production of ZrOCl 2·8H 2O by adding a little NaOH as reaction promoter in the process of concentrated Zr tails reacting with inexpensive lime is proposed. The suitable conditions for the fusing process were determined as follow: the mass ratio of reactants (NaOH:CaO: tails) is 0.2:1.5:1; fusion reaction temperature is 1 250 ℃; reaction time is 2 h.