Method for producing niobium oxide by using niobium-tantalum-iron

The invention discloses a method for producing niobium oxide by using niobium-tantalum-iron, belongs to the technical field of rare metal separation and recovery, and particularly relates to a method for producing niobium oxide by using niobium-tantalum-iron. The invention relates to a method for producing niobium oxide by using niobium, tantalum and iron, which comprises the following steps: crushing and ball-milling a niobium, tantalum and iron alloy material, then carrying out aerobic calcination, separating antimony and tungsten by alkaline leaching, extracting and separating copper and iron by using dilute acid, and leaching tantalum and niobium by using mixed acid. Meanwhile, antimony and tungsten are separated, enriched and recycled through alkaline leaching, rare metals such as copper and iron are separated and recycled through dilute acid, the whole process is low in cost, valuable metals are efficiently enriched and separated, acid consumption is low, acid supplementation in the extraction process i