高温固相法制备锆英石工艺研究

为研究高温固相法制备锆英石的最佳工艺条件,以不同粒度的SiO2和ZrO2粉体为原料,在1 500℃条件下通过不同的保温时间进行锆英石的制备。利用激光粒度分析、X射线衍射、扫描电镜等手段对原料的粒度、物相与结构和微观结构进行表征。结果表明:不同粒度的SiO2和ZrO2粉体在1 500℃条件下通过保温1.5、3、4.5、6 h均可制备出锆英石,但d50=2.125μm的原料通过保温4.5、6 h所制备出的样品效果最好。利用高温固相法进行锆英石的工业化生产,原料的d50控制在2μm左右,在1 500℃条件下保温4.5 h的生产工艺比较合适,所制备样品的晶粒度主要集中在0.2~1.5μm之间。

Synthesis of Zircon by High Temperature Solid State Reaction

In order to investigate the best technology for synthesizing zircon by high temperature solid reaction,the synthesis experiments were conducted under 1 500 ℃,using different granularities of zirconia and silica powder as starting materials.The particle characterizations of raw materials were measured by laser diffraction granularity analyzer.The phase and micro-morphology of synthesized zircon were analyzed by X-ray diffraction(XRD) and scanning electron microscopy(SEM).The results indicated that the as-prepared samples were found by heating 1.5,3,4.5,6 h at 1 500 ℃ by different granularities of stuffs.However,the ratio of transformation from zirconia and silica powder to zircon was the highest by heating 4.5,6 h at 1 500 ℃,using d50=2.125 μm zirconia and silica powder as starting materials.It was preferable technology to synthesize zircon by heating 4.5 h at 1 500 ℃,using d50=2 μm zirconia and silica powder as starting materials in industrial production.The grain size of synthesized zircon was mainly 0.2～1.5 μm