Two Aluminum Electrolytic With An Inert Anode Model Design And Preparation

Carbon material is used as the anode to produce the electrolytic aluminum. It has some problems such as high energy consumption, high-quality carbon consumption, product of pollution gas (CO2, CFn), expensive investment, low efficiency, unstable technology. So the researchers home and abroad have taken the great efforts to research the inertia anode to replace the traditional carbon anode.Two inertia anode models are designed and produced in the paper. NiFe2O4/Cu metallic ceramics is selected to prepare the inertia anodes, which has the advantage of corroding and oxidizing resistance that ceramics have and the merit of electric conduction, resistance to thermal shock and welding abilities that metals have.For the first 2-D graded inertia anode model, the design is focused on relaxing the thermal stress on the surface. And the optimization parameters are obtained by using the ANSYS FEM software (layer number n=9, composition index p=0. 2, angle 9=45 ). But there are some zones where have the high thermal stress in the anode model. These zones can result to the generation of surface crack. For verifying the simulating results, stock is prepared by centrifugal sedimentation, and then is sintered in the appropriate atmosphere. It is considered that the experimental results coincide with the simulating results.The simplified graded inertia anode model is provided from the improvement of the first 2-D graded model. This model is made of cup-shape section, core bar and plugging compound. ANSYS FEM software is used to compute the distribution of the thermal stress in the model. The computing results indicate the thermal stress in the cup-shape section is too low to lead to the generation of surface cracks. But the stress state at the interface between the cup-shape inertia and the plugging compound shows the stress state goes against the firm bonding. The cup-shape inertia anode is made by integral hot pressing. There have no cracks in the surface.But the bonding between the cup-shape section and the plugging compound is not firm, and the cracks exist. The experimental results prove the simulating results is right. So some measures such as Ni-plating should be adopted to implement the metallurgical bonding between the cup-shape section and the plugging compound and improve the bonding state.