Reducing agent adding device capable of improving reaction efficiency, smelting furnace and process for preparing zirconium oxide

The invention relates to the technical field of smelting equipment, in particular to a reducing agent adding device capable of improving reaction efficiency, a smelting furnace and a process for preparing zirconia. The reducing agent adding device capable of improving the reaction efficiency comprises a crushing mechanism, a gas circulating system and at least one stirring mechanism; the first stirring piece is provided with a material dispersing cavity and a material dispersing hole, the feeding cavity, the material dispersing cavity and the material dispersing hole form a feeding channel, the feeding channel is communicated with a crushing cavity of the crushing mechanism, and under the cooperation of the gas circulation system, a reducing agent crushed at the crushing mechanism is dispersed to the feeding channels and is dispersed and added through the feeding channels; meanwhile, the stirring mechanism conducts stirring operation, the reducing agent and the raw materials can be fully mixed in the smelting