悬浮态煅烧技术在超细氧化锌生产中的应用

Application of Suspension Calcination Technology in Production of Ultrafine Zinc Oxide

在室温下采用氨浸出锌烟灰制备碱式碳酸锌,再经高温悬浮态煅烧制得超细氧化锌;利用粒度分析、X射线衍射、扫描电子显微镜等技术手段对比堆积态煅烧和悬浮态煅烧所得产物的粒径及形貌。结果表明:当温度为500℃且气体体积流量为2.5 L/min时,氧化锌粒径d90达到最小值3.14μm;相对于堆积态煅烧,悬浮态煅烧使产物粒径更小,减少了团聚现象的产生,有利于大规模工业化生产。

Zinc carbonate hydroxide was prepared from zinc dust via ammonia leaching at room temperature, which was calcinated to obtain ultrafine zinc oxide by suspension technology. Particle size and morphology of the products calcinated in accumulation state and suspension state were investigated by technique of particle size analysis, X-ray diffraction and scanning electron microscopy. The results show that when the temperature is 500 ℃and the gas volume flow is 2.5 L/min, the particle size dg0 of zinc oxide reaches the minimum of 3.14μm. Compared with accumulation state calcination, the suspension calcination decreases the particle size of products and reduces agglomeration, which benefits the industrial production.