Device for continuously and circularly leaching electric furnace fly ash and preparing ferrous oxalate

The utility model discloses a device for continuously and circularly leaching electric furnace fly ash and preparing ferrous oxalate, and belongs to the technical field of hydrometallurgical equipment. The device comprises a size mixing tank, a second-stage leaching tank A, a second-stage leaching tank B, a leachate filtering system and a filter pressing system, the second-stage leaching tank A and the second-stage leaching tank B are connected through a variable-diameter connecting pipe, and a feeding bin is arranged on the upper portion of the second-stage leaching tank B; slurry in the second-stage leaching tank A and slurry in the second-stage leaching tank B enter a filter pressing system through a discharging valve A and a discharging valve B respectively to obtain zinc-rich slag and ferrous oxalate products, tail liquid enters a leaching liquid filtering system through a discharging port B of the second-stage leaching tank B, and after purification and impurity removal, the tail liquid is sent into a s