Problem to be solved: to reduce the stagnation of the second item near the reduction opening of the second processing chamber (the first half side) to reduce the increase in the load, and to prevent the leakage of the workpiece even in the end side (the latter side) to reduce the load.Solution: there is a transfer spiral (11) for transferring the second reducing material within a predetermined range on the starting end side of the transfer direction of the second processing cylinder (9) mounted in the second processing chamber (10)；A non porous receiving plate (14) is provided at a position facing the transfer spiral (11) at the bottom of the second processing chamber (10)；The second processing cylinder (9) has a processing tooth (12) for Degranulating the second material at the end of the transfer direction.At the bottom of the second processing chamber (10), there is provided a grid receiving network (15) capable of leaking the workpiece at a position facing the processing tooth (12).Diagram【課題】２番処理室始端側（前半側）の還元口近くでの２番物の停滞を少なくして負荷の増大を軽減し、また、終端側（後半側）でも処理物の漏下を促進して負荷の増大を軽減する。【解決手段】２番処理室（１０）内に軸架された２番処理胴（９）の移送方向始端側の所定範囲内には２番還元物を移送する移送螺旋（１１）を有し、２番処理室（１０）の底部における移送螺旋（１１）に対向する部位には無孔の受け板（１４）を設け、２番処理胴（９）の移送方向終端側には２番物を脱粒処理する処理歯（１２）を有し、２番処理室（１０）の底部における処理歯（１２）に対向する部位には処理物が漏下しうる格子状受網（１５）を設ける。【選択図】図２
