Separation technology of heavy metals in aluminum scrap

Scrap aluminum contains heavy metals such as copper. These metals are heavily polluted by oil contamination. It is difficult to separate heavy metals from waste aluminum by manual sorting. From the data reported at home and abroad, the research programs mainly include the following aspects:

(1) Heavy medium mineral processing

In other words, heavy medium non-ferrous metals such as copper with a density greater than that of aluminum are sorted by means of heavy medium re-selection, which utilizes the principle that the density of aluminum is smaller than that of other heavy non-ferrous metals, so that the aluminum waste floats on the medium while the heavy non-ferrous metal sinks. The bottom, to achieve the purpose of separation. But the key to technology is to screen a medium that has a density greater than aluminum but less than copper. This medium is by no means water or other liquids, certainly a fluid. When working, the fluid is reciprocating and aluminum scrap is separated on the medium.

(2) Parabolic ore dressing

By using the principle that different objects with substantially the same volume are different when the same force is thrown, various waste non-ferrous metals with different densities in the waste aluminum can be separated. When objects of different densities and substantially the same volume are ejected along a straight line with the same force, various objects move in the direction of the parabola, and the fall point when landing is different. Simpler experiments can be carried out on a horizontal conveyor belt, when the mixed waste material on the conveyor belt runs at a high speed along the conveyor belt. When it is run to the end, the waste aluminum is thrown along the straight line, due to the different gravity of various wastes. Different points were dropped to achieve the purpose of sorting waste aluminum. This method can evenly separate waste aluminum, copper scrap, lead waste and other wastes. Equipment manufactured under this principle has been adopted abroad and is currently in the research stage in China.