Here, "antimony slag" refers to a solid by-product generated and discharged from smelting, conversion or purification steps during the smelting and refining of antimony ore or the production of antimony chemical products, typically containing antimony, iron, sulfur and other metal oxides or sulfides. After such antimony slag has lost its original function in use or been discarded, following collection, stabilization treatment and metallurgical recovery it can be used as a secondary raw material for the antimony resource to recover antimony metal or prepare related chemical products, achieving resource recovery.