DE2729270A1 - Electrolyte recovery from rinsing baths in electroplating plant - by feeding rinsing water into plating tank fitted with evaporator - Google Patents

Abstract

The recovery is achieved by continuously feeding the electrolyte through a vacuum-evaporative cooling plant and then back to the electroplating tank. The water removed from the electrolyte in the evaporative cooling plant is pref. fed into the water rinsing bath(s); and the water in the first rinsing is pref. pumped into the electroplating tank. A closed system can be used in which no contaminated rinsing water is fed into the drains where it could cause environmental pollution. The rinsing water is fed into the electroplating tank, where the dilution effect is counter-balanced by evapn. The result is that a continuous supply of fresh water is not required; and expensive plant for the purificn. of effluent is eliminated.

Description

Description and claims

Designation: Process for the recovery of electrolytes that have been carried over in galvanic systems.

Field of application: The invention relates to a method in which with With the help of vacuum cooling technology in electroplating systems, electrolyte that has been carried over is recovered can be.

Purpose of the invention: When the goods emerge from a galvanic The bath remains attached to this bath liquid - electrolyte - and is transferred to the downstream Sink carried away. About the increasing concentration in the said sink To keep within limits, fresh water must be continuously supplied to this sink and accordingly water enriched with electrolyte discharged will. This sewage must, before it is discharged into the sewer system, detoxified and the pollutants precipitated will. This process, which is still used today, is harmful to the environment and very expensive. It not only requires high plant costs for the wastewater treatment plant, but also also significant operating costs for the required treatment chemicals. In addition, there is the ongoing need for fresh water.

Object of the invention: The invention is based on the object that to supply the electrolyte carried over to the galvanic baths again and at the same time to circulate the flushing water.

Solution: According to the invention, this object is achieved in that 1. the electrolyte is constantly circulated through a vacuum evaporative cooling system 2. the rinsing water does not go into the sewage system via the wastewater treatment as before it is instead fed into the galvanic bath 3. the evaporated water condenses and fed to the rinsing bath.

An embodiment of the invention is shown in the drawing and is described in more detail below: The galvanized goods leaves the galvanic bath (1) and enters the rinsing baths (2 and 3) one after the other submerged. The number of rinsing baths is irrelevant here. In countercurrent to this the rinsing water is pumped, this decreases the electrolyte concentration of the bath to bathroom off. The overflowing rinse water from the rinse bath (2) has the highest electrolyte concentration and is pumped back into the galvanic bath. With this rinse water pumped back the entrained electrolyte is also fed back into the electroplating bath. That Electrolyte from the electroplating bath (1) is continuously fed through the vacuum evaporative cooler (4) and the pump (5) circulated. The amount of water in the vacuum evaporation cooler (4) evaporates which was fed to the galvanic bath (1) from the rinsing bath (2). There If evaporation heat is withdrawn from the electrolyte, it cools down. That Water escaping in vapor form is condensed in the condenser (6) and from the Pump (7) pumped back into the rinsing bath (3). The vacuum pump (8) sucks in the leakage losses away.

Claims (3)

Claims: (5th method for the recovery of abducted Electrolytes in galvanic systems, characterized in that the electrolyte is constantly circulated through a vacuum evaporative cooling system. 2. The method according to claim 1, characterized in that the im Vacuum evaporator the electrolyte withdrawn water in the or the galvanic Bad downstream rinsing baths is returned. 3. Claim according to 1 and 2, characterized in that from the sink, which is immediately downstream of the galvanic bath, rinsing water in the galvanic Bath is being pumped.