NOVELTY - The apparatus comprises a main crane boom and a sub crane boom, where one side of the sub crane boom is positioned in a central part of a reservoir. Another side of the sub crane boom is rotatably coupled to one side of the main crane boom at top or bottom or left and right portions, where a solid material formed on the bottom surface of the reservoir is flown along the longitudinal direction of the other side of the sub crane boom. A control unit discharges the solid material formed to a rotary crane boom. A first sensor unit for sensing the longitudinal direction movement of the apparatus.    USE - The apparatus is useful for collecting solid precipitate (claimed) formed in a liquefied fertilizer.    ADVANTAGE - The rotary crane boom rotates the sub crane boom so as to move the precipitate suction apparatus in a longitudinal direction in a controlled manner thus easily taking away the precipitate from bottom surface of the reservoir with improved efficiency.    DETAILED DESCRIPTION - The apparatus comprises a main crane boom and a sub crane boom, where one side of the sub crane boom is positioned in a central part of a reservoir. Another side of the sub crane boom is rotatably coupled in one side of the main crane boom at top or bottom or left and right portions, where a solid material formed on the bottom surface of the reservoir is flown along the longitudinal direction of the other side of the sub crane boom. A control unit discharges the solid material formed to a rotary crane boom. The control unit includes a first sensor unit for sensing the longitudinal direction movement of the precipitate suction apparatus and a second sensor unit for sensing rotation angle in which the rotary crane boom rotates based on the other end of the sub crane boom. The control unit controls the rotation angle of the rotary crane boom and longitudinal direction movement of the precipitate suction apparatus through the sensing signal of first and second sensor unit. A movement drive motor is connected to first and second pulley equipped in the rotary crane boom in the spaced position with a constant distance. A hoist part is equipped in a lower part of a tray. A rotating chain moves the tray by driving force. An injection nozzle sprays water for crushing the solid material. A lift pump is located at the end of the crane boom. A conveying passage is used for transferring the solid material inhaled to the inside by the lift pump. A fixed frame is formed into a ring shape. A discharge hose ejects the solid material and is equipped at a lower part of a suction bracket. A solid-liquid separator separates the water contents from solids. A hose supporting guide ejects the solid material to the rotary crane boom by a transferred delivery hose.