Abstract: Provided is a method for producing sodium borohydride. An aluminum powder and a fluoride powder are mixed, and a pretreatment thereof is carried out at 100° C. or higher and 330° C. or lower; and after the pretreatment, a sodium borate is added and mixed, and the resulting mixture is charged into a tightly sealed vessel; and then after a hydrogen gas is introduced thereto, a heat treatment is carried out by heating the tightly sealed vessel at 490° C. or higher and 560° C. or lower.

Abstract: Provided is a method for producing sodium borohydride. At a time when a sodium borate, an aluminum powder, and a fluoride powder are mixed and caused to react in a tightly sealed vessel filled with a hydrogen gas at a temperature of 560° C.

Abstract: In a hermetic vessel filled with hydrogen gas, a sodium borate and aluminum powder are reacted at not less than 400° C. and not more than 560° C. while performing stirring to produce sodium borohydride with the molar ratio of sodium contained in the sodium borate being larger than 0.5 relative to boron contained in the sodium borate.

Abstract: A sodium borate, aluminum powder and fluoride powder are mixed together in a hermetic vessel filled with hydrogen gas, and the mixture is reacted at not less than 410° C. and not more than 560° C. to produce sodium borohydride.