Decomposing type precipitation tank for production of metal compound with ammonia method

The invention discloses a decomposing type precipitation tank for production of a metal compound with an ammonia method. The decomposing type precipitation tank comprises a precipitation tank casing, a perforated plate, an air stirring pipe and a heating coil assembly, wherein the precipitation tank casing comprises a top area, an upper connecting area, a defoaming area, a lower connecting area, an instant heating area and a bottom area which are connected from top to bottom; a mixed gas outlet is formed in the top area; an air inlet and charging ports are formed in the upper connecting area; a discharging port is formed in the bottom area; the perforated plate with an opening is arranged in the precipitation tank casing and is correspondingly located under the bottom of the instant heating area, and the edges of the perforated plate are attached and fixed on the inner wall of the precipitation tank casing; the air stirring pipe is arranged in the precipitation tank casing, one end of the air stirring pipe is