【摘要】 以碳化锆为原料,采用碱熔-水洗-酸浸-结晶工艺制备氧氯化锆,制得的氧氯化锆产品中ZrO2含量达到36.20%。考察了氢氧化钠与碳化锆物料比、碱熔温度、碱熔时间和碳化锆粒度对碱熔过程中锆转化率的影响,以及水与碱熔料比、水洗温度和水洗时间对水洗过程中除硅率的影响。用X射线衍射分析研究了碳化锆在煅烧碱熔过程中的物相变化。结果表明,碱熔过程中碳化锆转化为偏锆酸钠,碱熔的最佳工艺条件为:氢氧化钠与碳化锆的质量比为1.5,煅烧温度800℃,煅烧时间60 min,矿样粒度120目。在该工艺条件下碱熔,锆的转化率可达到99%以上。更多还原

【Abstract】 Zirconium oxychloride with purity of 36.20% was prepared from zirconium carbide by the process of alkali fusing,water washing,hydrochloric acid leaching and product crystallization.The effects of the mass ratio of NaOH to ZrC,calcinating temperature,reaction time and the particle size of ZrC on the rate of zirconium conversion in alkali fusing process were studied,and the influences of charge ratio as well as washing temperature and time on the percentage of silicon removal during washing were evaluated.The results show that the optimum conditions for the alkali fusing of zirconium carbide are as follows: the mass ratio of NaOH to ZrC is 1.5,calcinating temperature 800 ℃,reaction time 60 min and the particle size of ZrC 0.008 mm.Under these conditions the rate of zirconium conversion can reach the value of over 99%.In addition,the phase transformation of ZrC in alkali fusing process was also investigated by X-ray diffraction（XRD）,and the result indicates that zirconium carbide transforms into Na₂ZrO₃ completely at the calcinating temperature of 800 ℃.更多还原