Device and process for preparing aluminum bar by using secondary aluminum

The invention relates to the technical field of waste aluminum utilization, in particular to a device and process for preparing an aluminum bar through secondary aluminum, the device comprises a smelting furnace, a filtering box body, a heat preservation furnace and a casting mold which are sequentially arranged, and a material receiving pipe fitting is arranged on the filtering box body and used for receiving molten aluminum in the smelting furnace; a molten aluminum outlet pipe is further arranged on the filtering box body and used for conveying filtered molten aluminum into the heat preservation furnace, and a coarse filtering assembly and a fine filtering assembly are arranged in the filtering box body; the coarse filtering assembly is located between the material receiving pipe fitting and the fine filtering assembly and used for roughly filtering impurities in the molten aluminum, and the fine filtering assembly communicates with the coarse filtering assembly and the molten aluminum outlet pipe and used