Device and method for preparing superfine nickel powder

The invention relates to a device and a method for preparing superfine nickel powder. The device comprises a feeding system, a preheating system, a fluidized bed reactor and a cooling system which are sequentially connected. An outlet of the fluidized bed reactor is connected with a combustion chamber. An outlet of the combustion chamber is connected with the preheating system. After entering a cyclone preheater through the feeding system to be preheated, superfine nickel oxide enters the fluidized bed reactor to be subjected to the reduction reaction; and then the product is discharged after entering the cooling system. High temperature tail gas exhausted from the outlet of the fluidized bed reactor enters the combustion chamber to be burnt after being separated by a first cyclone separator. One path of tail gas is supplied to the preheating system and the other path of tail gas carries out heat exchange with carrier gas exhausted by a second cyclone separator and is supplied to the fluidized bed reactor through a first carrier gas inlet. The invention can solve the problems of poor fluidity, bonding defluidization and industrial scale-up of the superfine nickel powder. The preparation process is simple. The reaction temperature is low. The heat utilization rate is high. The continuous industrial scale production can be implemented.