高温固相法制备锆英石工艺研究

Synthesis of Zircon by High Temperature Solid State Reaction

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Si02和ZrO2粉体为原料，在1500℃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Si02和ZrO2粉体在1500℃条件下通过保温1．5、3、4．5、6h均可制备出锆英石，但d50=2．125μm的原料通过保温4．5、6h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1500℃条件下保温4．5h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。

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 ofzirconia 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 fTom 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 atl 500 ℃, using d50=2μm zirconia and silica powder as starting materials in industrial production. The grain size of synthesized zircon was mainly 0.2- 1.5 μm