Fluidized bed reactor for treating oxidic ore fines, in particular iron ore, - wherein the fluidized bed reactor has a distributor base, a distributor chamber and a reactor having a reactor chamber, - wherein the distributor base separates the reactor chamber spatially from the distributor chamber, - wherein the distributor base has a first distributor plate and a second distributor plate which is arranged on the first distributor plate, - wherein the first distributor plate is arranged at a side facing the distributor chamber and the second distributor plate is arranged at a side facing the reactor chamber, - wherein the first distributor plate has a first arrangement comprising first through-openings which extend from the distributor chamber in a first direction (z) toward the reactor chamber, - wherein the second distributor plate has an abutment portion which extends in a plate-like manner and parallel with the first distributor plate, - wherein the second distributor plate further has a second arrangement comprising a large number of cover portions, - wherein the abutment portion abuts with spacing from the first arrangement of the first through-openings against the first distributor plate, - wherein a cover portion of the second arrangement is in each case arranged with spacing in the first direction (z) with respect to an associated first through-opening and covers the associated first through-opening to the reactor chamber, - wherein the second distributor plate has on each of the cover portions a second through-opening which is arranged in a manner inclined in a second direction (x, y) with respect to the straight line so as to be offset with respect to the first through-opening, - wherein from the distributor chamber via the first through-openings and the second through-openings, a reaction gas for treating the ore fines and for forming a fluidized bed comprising ore fines and reaction gas can be introduced into the reactor chamber. - wherein the fluidized bed reactor has a distributor base, a distributor chamber and a reactor having a reactor chamber, - wherein the distributor base separates the reactor chamber spatially from the distributor chamber, - wherein the distributor base has a first distributor plate and a second distributor plate which is arranged on the first distributor plate, - wherein the first distributor plate is arranged at a side facing the distributor chamber and the second distributor plate is arranged at a side facing the reactor chamber, - wherein the first distributor plate has a first arrangement comprising first through-openings which extend from the distributor chamber in a first direction (z) toward the reactor chamber, - wherein the second distributor plate has an abutment portion which extends in a plate-like manner and parallel with the first distributor plate, - wherein the second distributor plate further has a second arrangement comprising a large number of cover portions, - wherein the abutment portion abuts with spacing from the first arrangement of the first through-openings against the first distributor plate, - wherein a cover portion of the second arrangement is in each case arranged with spacing in the first direction (z) with respect to an associated first through-opening and covers the associated first through-opening to the reactor chamber, - wherein the second distributor plate has on each of the cover portions a second through-opening which is arranged in a manner inclined in a second direction (x, y) with respect to the straight line so as to be offset with respect to the first through-opening, - wherein from the distributor chamber via the first through-openings and the second through-openings, a reaction gas for treating the ore fines and for forming a fluidized bed comprising ore fines and reaction gas can be introduced into the reactor chamber.