Clean production technique of vanadium oxide by vanadium slag carbocholine leaching-hydrogen reduction process

The invention relates to a clean production technique of vanadium oxide by a vanadium slag carbocholine leaching-hydrogen reduction process. The technique comprises the following steps: (1) mixing and proportioning the vanadium slag and additives, and roasting to obtain a roasted product; (2) leaching the roasted product obtained in the step (1) with a carbocholine water solution, and carrying out liquid-solid separation; (3) evaporating the solution separated in the step (2), cooling to crystallize, and separating to obtain a sodium metavanadate crystal; and (4) drying the sodium metavanadate crystal obtained in the step (3), reducing with hydrogen, and carrying out immersion cleaning for dealkalization, atmosphere roasting, washing for desalting, drying and crushing on the reduction product to obtain the vanadium oxide product. The technique has the advantages of high vanadium recovery rate and low impurity content in the leaching solution. The sodium metavanadate is used for directly preparing the vanadium oxide product, thereby avoiding the treatment of the ammonia nitrogen wastewater. The technique is simple and clean, and has the characteristics of no pollution and the like.