摘要
在锆英砂与氢氧化钠质量比为1.0∶1.2时,分别选取锆英砂含量0.2%,0.4%,0.6%,0.8%和1.0%的Ca(OH)2作为添加剂,研究Ca(OH)2加入量对锆英砂碱熔分解过程的影响。采用X射线衍射仪和差热-热重分析仪对反应物料的组成和反应体系热量变化进行分析。结果表明:在Ca(OH)2加入量为1.0%时,锆英砂的分解率达到最大值,为96.4%,碱熔过程中在590℃以后发生剧烈的放热反应,锆英砂碱熔分解后的主要产物为Na2ZrO3和Na2SiO3。烧碱和添加剂复合分解锆英砂的适宜工艺条件为:烧结温度为750℃,烧结时间为30 min。
With the zircon sand to sodium hydroxide mass ratio of 1.0： 1.2, and the Ca（OH）2 additive amount of 0.2%, 0.4%, 0. 6%, 0.8% and 1.0% to zircon amount separately, the influence of Ca（ OH）2 on zircon alkali fusion decomposition process was studied. The composition of the reactant and heat changes of the reaction system were analyzed by X-ray diffraction （XRD） and differ- ential scanning calorimetry-thermal gravimetric analysis （DSC-TG）. It was found that when the additive amount of Ca（OH）2 reached 1.0%, the decomposition rate of zircon increased up to a maximum value of 96.4%. When the temperature reached 590 ℃, the process of alkali fusion decomposition occurred a violent exothermic reaction, and the main products of zircon alkali fusion decomposi- tion were Na2ZrO3 and Na2SiO3. In addition, the results showed that the optimal sintering temperature and sintering time were about 750 ℃ and 30 min respectively to decompose zircon with caustic soda and Ca（OH） 2 additive.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第5期778-782,共5页
Chinese Journal of Rare Metals
基金
教育部科学技术研究重点项目(211031)
内蒙古自然科学基金项目(2011MS0709)资助
关键词
锆英砂
碱熔工艺
锆分解率
zircon
alkali fusion technology
zircon decomposition rate
