According to the scheme, a
liquid phase reduction method is firstly adopted,
silver nitrate and a
reducing agent are adopted according to the main principle, and a certain amount of water-based dispersing agent or oil-based dispersing agent is added, so that the silver
powder with certain dispersing performance is obtained, and in order to guarantee that the silver
powder with high
dispersity and uniform particle size can be obtained, the preparation method is simple, and the cost is low. The water-based dispersing agent is selected, meanwhile, the
reducing agent is any one or more of
ascorbic acid,
formaldehyde, hydrazine
hydrate and
hydrogen peroxide, after the reduction reaction is finished, alkali liquor continues to be added, the pH of the suspension C is adjusted to be 8-14, hydroxyl ions are contained in the
system in the process, the structure of the dispersing agent can be destroyed through strong
alkalinity, and therefore the dispersing effect is improved. Therefore, the dissociation effect is achieved; the method can be applied to any preparation method of the silver
powder using the water-based dispersing agent, complete
sedimentation of the silver powder can be achieved, organic residues on the surface of the obtained silver powder are lower than those of the silver powder not using the method by 0.3% or above, and high practicability is achieved.