AW Electronic - Abwasser und Wassertechnik

AW-RE 250 - 5000 Retardation Plants

Plants for acid / mineral separation

General Information

Retardation prolongs the lifetime of anodisiation baths. Sulphate electrolytes used to anodize aluminum are concentrated with aluminum. For each square meter of material, an average 7-10 g aluminum is used during an exposure of 45 minutes. The electrolyte becomes useless when the concentration reaches 20 grams / liter (nominal value 10 g/l). Aluminum concentration is usually reduced by renewal or partial exchange of the electrolyte, which leads to high concentration fluctuations and (at the same current density) therefore  higher energy costs as well as higher cooling costs due to increased heating.

A retardation plant can keep the aluminum constant level, reducing energy costs and improving surface quality in the product. Sulfuric acid neutralization and the associated sulphate exposure are reduced to drag-outs, further reducing costs.

Principle

Acid / mineral separation using the retardation principle

Function

The anodisiation solution is pumped through a mechanic pre-filter into the bath tank, and the carried upwards into the working storage tank by pressurized air, separating it into metalliferous solution, which is carried to waste water treatment, and sulfuric acid which is bound by special resins.
A water tank keeps a predetermined amount of water, which is pushed down into the working storage tank by pressurized air, where the previously bound sulfuric acid is released. The solution is then pumped back into the anodisiation bath.

The process can be run a maximum of 4 times per hour and can be preset from one to four cycles. Processing and idle times for working days and weekends can be individually set with a timer.
A touch panel with procedure schematics and all necessary controls and sensors makes the plant easy to control and use.
A switchover mechanism for use with several anodisiation baths is available.

Installation

The plant is delivered in compact form, mounted on a steel rack with height-adjustable and ready for connection. On site, the lead connections (city water, pressured air, acid bath), the discharge connection for waster water, the connection back to the bath and the electrical connection have to be created.

Benefits

  • efficient filtration
  • constant surface quality
  • energy saving
  • reduced usage of chemicals
  • reduced usage of neutralizing agents
  • reduced sulphate exposure
  • reduced disposal cost
  • compact build
  • automated controlling with SPS
  • easy to use

Technical Data

Typ Rate Dimensions L x W x H in mm
RE 250 250 g/h 1.310 x 760 x 1.700
RE 1000 1.000 g/h 1.515 x 800 x 2.200
RE 2000 2.000 g/h 1.660 x 860 x 2.200
RE 3000 3.000 g/h 2.110 x 1.050 x 2.200
RE 5000 5.000 g/h 2.310 x 1.150 x 2.200

Higher capacities on request
Subject to modifications

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