Abstract:The particle size and density of high compacted density palladium powder prepared under different conditions were investigated by using the complex solution in the refining process of platinum group metal palladium as raw material, and the optimal preparation process and technical conditions were selected through experiments. The results show that high compacted density palladium powders with uniform particles and compacted density up to about 3.25 g/cm3 can be prepared by direct reduction of palladium complex solution with hydrazine hydrate to form palladium sponge as crystal seed at pH=8 and further reduction with hydrazine dihydrochloride.