Technology research on preparation of superfine zinc oixde by gas-liquid reaction in rotating packed bed
Used Zn(NQ3)2 solution and NH3 as raw materials, the superfine precursor Zn(OH)2 is prepared in rotating packed bed by gas-liquid reaction. The superfine ZnO is obtained when the superfine Zn(OH)2 is decomposed in high temperature. The obtained samples are detected by XRD and TEM. The results show that the ZnO particles are 20 - 80nm in size. The effect of operation parameters, such as rotating speed, the concentration of material, the percent of ammonia and the ratio of gas and liquid flow on the mean size of precursor Zn( OH)2 particle are investigated experimentally. The wash condition is chosen. The temperature and time of calcination is optimized. The optimum technology conditions for preparing superfine ZnO by gas-liquid reaction in rotating packed bed are determined.