| 摘要 |
An impact scrubber for removing coating materials from the surfaces of particulate matter such as foundry sand and the like comprises a lift tube open adjacent upper and lower ends for containing a high velocity fluidized stream of said particulate matter. A fluid injector is mounted adjacent the lower end of the lift tube for moving the particulate matter into the lift tube to form an upwardly flowing, high velocity turbulent fluidized stream. An adjustable inlet valve is provided adjacent the fluid injector for regulating the flow of sand into the high velocity stream of fluid moving into the lift tube. A target is spaced above the open upper end of the lift tube providing an impact area for receiving the flow of high velocity fluidized particulate matter which impacts against the target. The coating material is loosened from the sand grains by the impact at the target and during the turbulent flow. The separated, heavier sand particles and the lighter coating materials are deflected downwardly by the target and a secondary fluid flow is provided to move outwardly of the lift tube for intercepting the downward curtain of particulate matter and coating materials and carrying away the lighter coating materials while permitting the heavier sand grains to continue to fall downwardly. An outlet fluid exhaust valve is provided for adjustably controlling the outflow of air and coating materials that are removed from the sand grains. A plurality of scrubbing units as described are arranged in series and a novel baffle system is provided to deflect a portion of the material from one unit into the next unit and recycle the remaining portion. Metering devices are provided for controlling the inflow and outflow of particulate matter and cleaned sand grains through the scrubber. |
