Manufacturing method and apparatus for recycle sand exploiting construction waste concrete

摘要

PURPOSE: A method and an apparatus for manufacturing recycled fine aggregate for construction are provided to effectively remove cement mortar adhered onto waste concrete by removing soil and foreign materials from construction waste, and crushing, washing and sorting waste concrete from which soil and foreign materials are removed. CONSTITUTION: The apparatus for manufacturing recycled fine aggregate using construction waste comprises a hopper(1) and a vibration feeder(2) for injecting and storing a raw material of construction waste; a dry type screen(3) for primarily removing earth from the raw material; a jaw crusher(4) for primarily crushing the waste concrete; a feeder(5) for supplying the crushed waste concrete to a be a fan (F1) for secondly removing foreign materials using wind force; a belt magnet (M1) for removing magnetic materials; second dry type screen(6) for secondly removing earth; a fan (F2) and a magnetic separator (M2) for secondly removing magnetic materials by wind force and magnetic force; a sorting machine comprising a dehydrator(9) for dehydrating the foreign materials removed raw material and a dehydrator(8) for dehydrating an intermediate raw material of waste concrete; a compression type crusher(10) for secondly crushing the intermediate raw material; a compression type crusher(12) for thirdly crushing the raw material supplied by a feeder(11) through a B6 be a two-step wet type vibration screen(13) for screening the raw material from which magnetic materials are removed by a third magnet (M3); a sorting machine for retreating the residual material passing the upper part of the screen; a third fan (F3) for removing foreign materials again from grains passing the lower part of the screen; a roll crusher(14) for crushing the material passing the third fan (F3); a fourth magnet (M4) for removing magnetic materials from the crushed material; a vertical shaft impact crusher(15) for crushing the material passing the fourth magnet (M4); a multiple classifier(16) for transferring and classifying the material in the slurry state; a dehydrator(17) for dehydrating sand and discharging the dehydrated sand as fine aggregate; a catchment tank and a pump(18) for catching and transferring the sludge; a thickener(19) for coagulating the sludge; a storage tank(21) for transferring and storing the concentrated sludge; a filter press(22) for dehydrating the concentrated sludge to make cake; a supplementary water tank(20) for recycling centrate from the filter press(22) and the thickener(19); a control room(23) for automatically controlling the above machines and equipment; and a plural belt conveyors for transferring the raw material between the machines and equipment.