Preparation method for large-particle-size molybdenum powder

The invention relates to a preparation method for a large-particle-size molybdenum powder, and belongs to the technical field of preparation for molybdenum powder. The preparation method for the large-particle-size molybdenum powder comprises the following steps: taking ammonium molybdate containing K with a content of 100ppm-150ppm as a raw material; carrying out primary hydrogen reduction to obtain MoO2 powder; and then carrying out secondary hydrogen reduction on the MoO2 powder to obtain the large-particle-size molybdenum powder. In the reduction process, K with the content of 100ppm-150ppm urges Mo atoms to be rapidly stacked into a crystal, and a stacking range is expanded, so that the crystal grows; meanwhile, the reduction reaction progress is prolonged, the crystallization growthtime of molybdenum powder particles is increased, and the molybdenum powder particles are further enlarged, so that the large-particle-size molybdenum powder is obtained; and the raw material used inthe method is wide in sour