Method for preparing niobium powder through metal thermal reduction method

The invention belongs to the field of metal niobium preparation, and particularly relates to a method for preparing niobium powder through a metallothermic reduction method. The method comprises the following steps: uniformly mixing niobium pentoxide powder, a reducing agent and a diluent, heating under the protection of argon to react, and cooling to room temperature after the reaction is finished; and sequentially carrying out passivating treatment, acid pickling, filtering and freeze-drying treatment on the cooled product to obtain the final product niobium powder. The adopted raw materials are easy to obtain and low in cost, the metal niobium powder can be prepared in one step through the method, no intermediate product is generated, the intermediate product does not need to be further treated, aftertreatment of the method is simple, and the method for preparing the niobium powder has the advantages of being simple in technology, short in process, low in energy consumption and low in cost; and the prepare