Which machine can be used to select aluminum ore

The most commonly used machine for selecting aluminum ore is the flotation machine. The flotation machine is used to separate and concentrate ores by selectively attaching to the surface of bubbles. 

Aluminum ore usually contains a large amount of impurities, and the flotation machine can effectively separate them to obtain a higher grade of aluminum concentrate. Other machines such as magnetic separators and gravity separators can also be used to select aluminum ore, but they are less commonly used compared to flotation machines.