Many enterprises use the electrolytic aluminum liquid as much as possible to directly put it into the melting furnace of casting and rolling, which saves the energy required for the secondary remelting of remelted aluminum ingots, reduces burning loss, and realizes energy saving and emission reduction.
Although the use of electrolytic aluminum liquid to directly produce casting and rolling coils can save costs and reduce consumption, compared with remelted aluminum ingots, the excessively high proportion of electrolytic aluminum liquid will directly lead to high hydrogen content, high slag content, and alkali metal content in the aluminum melt. The high and coarse grain size of cast-rolled sheet. Therefore, hydrogen removal, slag removal, alkali metal removal, and grain size refinement are the difficulties that must be solved in the direct production of cast-rolled coils using electrolytic aluminum liquid.
AdTech specializes in researching and developing new refractory materials for the degassing and slag removal purification of molten aluminum, includes refining fluxes, online degassing system, plate filtering unit and ceramic foam filter.
In order to reduce the hydrogen content in the electrolytic aluminum liquid and refine the crystal grains, the method of reducing the temperature of the electrolytic aluminum liquid is adopted. As the temperature decreases, the solubility of hydrogen in the aluminum liquid is significantly reduced.
Through the mixing ratio of different content of electrolytic aluminum liquid, it is found that the molten hydrogen content is the lowest when the mass fraction of electrolytic aluminum liquid is 25%. This is mainly due to the low consumption of electrolytic aluminum liquid. After a small amount of the electrolytic aluminum liquid is added, the temperature of the electrolytic aluminum liquid is reduced by the influence of the aluminum ingot, thereby reducing the solubility of hydrogen in the electrolytic aluminum liquid. In addition, there is heat from the electrolytic aluminum liquid during melting, which shortens the melting time and reduces the hydrogen absorption during the melting process.
The billets with strict requirements for alkali metals are refined with refining agents, which can meet the requirements.