Process for extracting iron from hot slag generated by copper smelting

The invention discloses a process for extracting iron from hot slag generated by copper smelting. The process comprises the following steps that the slag is delivered into a wet type sanding machine through a belt conveyor, so that the slag is completely crushed into fine slag, then the fine slag which is completely crushed is delivered into a sawtooth wave jigging machine, the sawtooth wave jigging machine discharges particulate matter with the size being smaller than 170 grits into a shaking table through a pipe and directly discharges particulate matter with the size being greater than 170grits into a slag piling-up area, so that secondary grinding is conducted, 8-15 powerful electromagnet plates are arranged below the shaking table, when the particulate matter passes, Fe3O4 is adsorbed by the electromagnet plates, electromagnets are powered off after screening is completed, and the Fe3O4 is recycled; and 2, magnetic separation is conducted on the recycled Fe3O4, so that silicon dioxide and calcium oxide m