| 摘要 |
Sludge returned to a tank containing a metal pretreating solution, for example zinc phosphate, is continuously removed from the bottom of the tank by a pump at a rate which is in excess of the capacity of a clarifier device to effect separation of sludge from solution and is delivered to a centrifugal cleaner in which the sludge is concentrated to a flow rate within the capacity of the clarifier device to which the concentrate is delivered from the cleaner. |
