Study On Production Of Pseudoboehmite Using Ceramic Membrane Filtration

As a very important chemical aluminum oxides product, pseudoboehmite is widely applied in the preparation of FCC. This production is viscous and enrichment of pored-structure, which can decide the activation of FCC with the other components and also influence the strength of FCC. Up to now, the preparation technology of pseudoboehmite in Shangdong Filiale of Chinese Aluminum Company is relatively stable, but the facilities and washing technology are relatively behind the times, which result in the large amount of the washing water, low rate of recovery, low automaching and low enviromental-friend.This paper investigated the influence of different membranes and technoloy parameters on the quality of pseudoboehmite firstly in lab. The results showed as following:1. The desalinization of the equipemnt with two layers reverse osmosis membrane is high, but the process need to be operated at about 30℃, and the organic reverse osmosis membrane gets older seriously in the alkaline condition.2. The optimum parameters of electrodialysis are 35～38℃temperature,2001/h flowing rate, 600-900 V/m electrical field strength and 96 membrane.3. The handling capacity of 0.66μm ceramic membrane can be 1-2m3/m2-h. After comparison, the inorganic ceramic membrane is selected to be applied in this study.Based on the results of the experiments in lab, experiments in industrialization were carried out and the technological route and parameters are detemined:laminar filtration and stratospheric washing, slurry with about 100g/L solid content,70-95℃temperature,30h acid washing period, and 1% acid content. The results of industrial experiments showed that the inorganic ceramic membrane technology has the following properties:low amount of washing water, high rate of recovery, simple operating flow. After co-operation with the according company, the whole processing has been relized to be automatic control, which improves the production efficiency and working environment, lowers human impact. Up to now, the inorganic ceramic membrane technology has been applied in the production of high quality and purity pseudoboehmite.