Method for processing electronic and electric device component scraps
Provided is a method for processing electronic and electrical device component scrap, which can improve an efficiency of sorting of raw materials fed to the smelting step from electronic and electrical device component scrap, and reduce losses of valuable metals. A method for processing electronic and electrical device component scrap which includes sorting electronic and electrical device component scrap by wind powder sorting to remove plate-shaped materials containing valuable metals included in the electronic and electrical device component scrap, and then sorting the resulting sorted objects by magnetic sorting.
1. A method for processing electronic and electrical device component scrap, comprising sorting electronic and electrical device component scrap by wind power sorting to remove plate-shaped objects containing valuable metals from the electronic and electrical device component scrap, and then sorting resulting sorted objects by magnetic sorting,
wherein the plate-shaped objects are sorted by using a wind power sorter comprising;
a diffusion chamber which diffuses the plate-shaped objects therein using an air flow;
a blower which generates the air flow in the diffusion chamber;
a feed portion which feeds the electronic and electrical device component scrap into the diffusion chamber while vibrating the scrap; and
a guide portion extending into the diffusion chamber from a terminal of the feed portion, the guide portion having a comb shape and comprising a plurality of protruding portions having a space therebetween, a width of the space being formed to be uniform from the terminal of the feed portion to a feeding direction, and the guide portion being arranged such that the air flow is brought into uniform contact with the plate-shaped objects from lower surfaces of the plate-shaped objects in a perpendicular direction to the lower surfaces of the plate-shaped objects.
2. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the plate-shaped objects comprise at least one of substrates with lead wires, substrates with no lead wire, and ICs.
3. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the plate-shaped objects having a maximum diameter of 100 mm or less are removed.
4. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the plate-shaped objects in the sorted objects are reduced to 10% by mass or less by the wind power sorting.
5. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the wind power sorting is carried out at a wind velocity of 15 m/s or more.
6. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the electronic and electrical device component scrap before being subjected to the wind power sorting is crushed using a shear crusher or a hammer crusher.
7. The method for processing electronic and electrical device component scrap according to claim 1 , further comprising performing eddy current sorting after the magnetic sorting.
8. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the wind power sorting comprises sorting the plate-shaped objects including substrates with lead wires to a light weight side of the wind power sorter.
9. The method for processing electronic and electrical device component scrap according to claim 1 , wherein the wind power sorting comprises:
a first wind power sorting to remove powdery objects and film-shaped objects from the electronic and electrical device component scrap; and
a second wind power sorting to remove the plate-shaped objects containing valuable metals included in the electronic and electrical device component scrap.
10. The method for processing electronic and electrical device component scrap according to claim 9 , wherein a wind power velocity of the first wind power sorting is 5 m/s to 8 m/s and a wind power velocity of the second wind power sorting is 15 m/s to 20 m/s.