METHOD AND APPARATUS FOR RECYCLING WASHING LIQUID AND HEAT CONTAINED IN WASHINGS DISCHARGED FROM METAL SURFACING PROCESS

摘要

A system for recovery and recycling of a washing liquid and heat contained in the washings discharged from the metal surface treatment process comprises a hot water washing tank (1) with an associated cushion tank (5), a water washing tank (16) with an associated cushion tank (18), a heat exchanger (13), an ion exchanger (14) and a filter (18). The second-mentioned cushion tank (18) is in communication with the hot water washing tank through the heat axchanger, while the first-mentioned cushion tank (5) is in communication with the water washing tank through the filter, the heat exchanger and the ion exchanger.