NOVELTY - The apparatus has a carrying belt conveyor (1) for conveying polycrystalline-silicon lump crushed material (4). The airflow injector (5) is arranged for blowing-off of fine powder (6) entrained to polycrystalline-silicon lump crushed material provided above track surface of conveying belt of carrying belt conveyor. The net structure (7) is provided for leap prevention of polycrystalline-silicon lump crushed material inserted between the track surface of a conveying belt (2) and airflow injector.    USE - Manufacturing apparatus of cleaned polycrystalline-silicon lump crushed material for silicon wafer used for manufacturing semiconductor device or solar cell.    ADVANTAGE - The cleaned polycrystalline-silicon crushed material is obtained at the time of the polycrystalline-silicon lump's crushing. The contaminating fine powders such as fine metal powder and fine silicon powder are efficiently removed by blowing the gas stream. The manufacturing process of polycrystalline-silicon lump crushed material is simplified.    DETAILED DESCRIPTION - The conveying belt is formed in the mesh structure. The track surface of the conveying belt is cleaned by the airflow injector. The airflow injector is equipped with the mechanism which moves to the width direction of the conveying belt in spraying of the airflow. The accumulation length of the polycrystalline-silicon lump crushed material is set as in the range of 2-160 mm. The ionization airflow ejector is provided in the upstream rather than the airflow injector for blowing-off in the running direction of the conveying belt. The airflow sprayed from the installation location of the airflow injector, and the conveying belt accommodated in the housing (10) whose wall portion is provided with an exhaust port (9). An INDEPENDENT CLAIM is included for a manufacturing method of cleaned polycrystalline-silicon lump crushed material, involves spraying airflow on the polycrystalline-silicon lump crushed material mounted in the conveying belt. The fine powder entrained to the polycrystalline-silicon lump crushed material is removed.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross-sectional of the manufacturing apparatus of polycrystalline-silicon lump crushed material.    Carrying belt conveyor (1)    Conveying belt (2)    Polycrystalline-silicon lump crushed material (4)    Airflow injector (5)    Fine powder (6)    Net structure (7)    Exhaust port (9)    Housing (10)