Aluminum Electrolytic Pre-baked Anode Modified Laboratory Research And Industrial Trials

In view of the situation of high electric energy and carbon consumption in the process of aluminum electrolysis, a new type of low-cost compound additive used for pre-baked anode is prepared in laboratory. This compound additive is successfully used to aluminum electrolysis industry and some good results have been achieved.In laboratory research, several causes affecting the precision of measurements were analyzed; a cell configuration was used for over-voltage studies. An improved current interruption technique is used with current interrupted in less than 2ps and a simulation is applied to the oscillating potential decay curve.Three types of property-changed anodes (type A, type B and type AB) containing Al, Mg, F, and 0 were prepared in different place and with different raw material source. The physical, chemical and electro-chemical properties testing results show: Firstly, three types of property-changed anodes can meet the demands of production, but the physical property will be changed with the different raw material source. Secondly, when the anode current density is lA/cmJ, type B shows the best effect of lowing over-voltage (about 79mV), type AB lows about 74mV, type A lows about 61mV, in the mean time, with the increasing of baking temperature (from 1100 癈 to 1250 癈), the result of lowing anode over-voltage become bad. Thirdly, the experiment of resisting air and COj reaction shows, the property-changed anodes containing lwt% type A or 1.5wt% type AB additives have better effect in resisting air and CO: reaction than contrasting anodes, but those which contain type B additives have hardly effect comparing with contrasting ones.The property-changed anodes containing 1. 5wt% are applied in industry test for 4 months, the result shows, test cells have reduced electric energy 106. IKwh per ton Aluminum, increased current efficiency 0. 72%, anodes consumption have reduced ll.BKg per ton Aluminum, with comparing to contrasting anodes. The results of saving energy, reducing carbon consumption and increasing efficiency are very marked. This technological achievement passed the appraisal and gained reward.