Purification method for copper smelting crude ammonium perrhenate

The invention discloses a method for purifying crude ammonium perrhenate in copper smelting, and belongs to the technical field of ammonium perrhenate purification, and the specific flow is as follows: carrying out size mixing and leaching on the crude ammonium perrhenate to obtain leaching residues and a leaching solution, and returning part of the leaching solution to an acid-making adsorption process in an open way; carrying out size mixing, heating and leaching on the leaching residues obtained in the previous step, carrying out solid-liquid separation to obtain leaching residues and a leaching solution, and returning the leaching residues to a system; adding an oxidizing agent A into the leachate obtained in the previous step, heating and oxidizing, finely filtering, and returning oxidizing slag to a system; after freezing and crystallizing the oxidation liquid, carrying out solid-liquid separation to obtain primary crystals and liquid after primary crystallization; and adding the primary crystal into a