1), the waste galvanized sheet is cut into 2xzcm galvanized iron sheet by cutting machine;
2) Add the galvanized iron sheet to the vacuum mixing container, start the external heating device to heat the vacuum mixing container, the heating temperature is 495℃, stirring for 30min, most of the zinc on the galvanized iron sheet is peeled off, and the galvanized iron sheet and metal powder with partial zinc removal are obtained after cooling，One of the steel substrates is Mild Steel Coil，Carbon Steel Coil，High Carbon Steel Strip;
3) Galvanized iron sheet, steel ball and paraffin oil with partial zinc removal are added to the vertical stirring ball mill according to a certain mass ratio, and the residual zinc and a small amount of iron on the galvanized iron sheet are rubbed off by ball milling for 20-40min, and the metal powder with oil removal is obtained by alcohol cleaning and screening;
4), the step 2) and step 3 to get the metal powder mixed, further research and treatment, using a magnetic separator for magnetic separation of metal powder, zinc powder and iron powder.
2. According to the method of recovering zinc in the waste galvanized sheet described in claim 1, the characteristic is that the thickness of the waste galvanized sheet is 0.3-0.5mm.
3. A method for recovering zinc from a waste galvanized sheet described in claim 1 is characterized in that the reaction pressure in step 2 is 2KPa.
4. According to the method of recovering zinc in a discarded galvanized sheet described in claim 1, the characteristic is that: in the step 3), the diameter of the steel ball is 30mm, and the mass ratio of the galvanized iron sheet to the steel ball and paraffin oil is 1.5:1:0.05.
5. According to the method of recovering zinc in the waste galvanized sheet described in claim 1, the speed of the vertical stirring ball mill is 200-300r/min in the step 3.
6. According to the method of recovering zinc from waste galvanized sheet described in claim 1, the characteristic is that: in the step 4), the particle size of the metal powder after grinding treatment ranges from 200 mesh to 300 mesh.