Reactor device for the fast reaction and precipitation of chemical substances comprising: a housing defining an inlet zone; one stator disc comprising one or more rings of spaced away teeth (7, 7') with openings to the bottom, concentrically located within the inlet zone and fixed to the reactor device; one rotor disc comprising one or more rings of spaced away teeth (8, 8') with openings to the top, configured for rotation about an axis of rotation relative to the stator and concentrically located within the inlet zone; a first inlet located eccentrically at a first radial location for supply of a first reactant material to the inlet zone; an outlet to remove the product collected in a collector zone; at least one further inlet located eccentrically at a radial location, different from the radial location of the other inlet for supply of at least one further reactant material to the inlet zone; the spaced away teeth of the stator rings (7,7') and the spaced away teeth of the rotor rings (8,8') being alternatingly adjacent to each other in radial direction; the stator rings engaging the rotor rings from the top in such a way that the openings of the spaced away teeth build the only communication of the inlet (10, 10') to the outlet; the materials supplied to the inlet zone afterwards approaching the one or more rings of the stator and rotor (5, 6); characterized in that the first inlet for supply of a first reactant material and the at least one further inlet for supply of a further reactant material are located such that the reactant materials hit the spaced away teeth of the interior rotor ring first after being supplied through the inlets (10, 10'). a housing defining an inlet zone; one stator disc comprising one or more rings of spaced away teeth (7, 7') with openings to the bottom, concentrically located within the inlet zone and fixed to the reactor device; one rotor disc comprising one or more rings of spaced away teeth (8, 8') with openings to the top, configured for rotation about an axis of rotation relative to the stator and concentrically located within the inlet zone; a first inlet located eccentrically at a first radial location for supply of a first reactant material to the inlet zone; an outlet to remove the product collected in a collector zone; at least one further inlet located eccentrically at a radial location, different from the radial location of the other inlet for supply of at least one further reactant material to the inlet zone; the spaced away teeth of the stator rings (7,7') and the spaced away teeth of the rotor rings (8,8') being alternatingly adjacent to each other in radial direction; the stator rings engaging the rotor rings from the top in such a way that the openings of the spaced away teeth build the only communication of the inlet (10, 10') to the outlet; the materials supplied to the inlet zone afterwards approaching the one or more rings of the stator and rotor (5, 6); characterized in that the first inlet for supply of a first reactant material and the at least one further inlet for supply of a further reactant material are located such that the reactant materials hit the spaced away teeth of the interior rotor ring first after being supplied through the inlets (10, 10').