Aluminum die-cast

General task requirements for systems treating separating agents from the aluminium die-cast:

  • Minimization of disposal costs,
  • High quality distillate with which the separating agents can be used again or discharged

Specific customer requirements:

  • Considerable cost reduction by recycling instead of disposing wastes
  • High quality distillates, without release/separating agents or oil residues
  • Waste reduction
  • Further thickening of the concentrate
  • Short amortisation periods
  • If discharged: Distillate temperature below 35°C

Specifics of treating die-cast emulsions using evaporators:
Separating agents often contain oils, grease and glycol from hydraulic hoses.
It is possible to recycle the distillates (to be able to re-use separating agents). In this case, the manufacturers of separating agents often require that approximately 30% fresh water be added. This is achieved by compensating for that which was lost by evaporation.
Generally 3 phases are produced in the distillate:
The oil-wax phase floats to the top. The watery phase stays in the middle. And the sludge settles at the bottom.
By evaporating the watery phase again, the amount of concentrate can be reduced considerably.

System description:
The separating agents which are to be treated are collected in a storage tank.
It is usually necessary to raise the pH-value.
In the Evaporator ET, separating agents, surfactants, oil, glycol and dirt are safely removed from the water. The residual oil separators which are integrated in the Evaporator ET guarantee that not even minimal amounts of volatile oils or surfactants can enter the distillate. Depending on the waste water which is to be treated and the required quality of the distillate, an after-treatment may be necessary. This can be done with a residual oil separator or a PCS Unit with a low CSB limit.
The amounts of concentrates which are produced vary considerably in the area of die-cast. Because of the big differences in the amount of dirt present in the used separating agents, we cannot make any kinds of general statements. It is necessary to always do an analysis in our laboratory first.

System ET: Goals which have been achieved in practice

  • Minimal operation costs thanks to extremely low energy consumption
  • Recycling separating agents
  • Best quality distillate guaranteed by integrated residual oil separators and air ventilation systems
  • Frequency controlled compressor motors provide for high concentration and minimal waste concentrates
  • Short amortisation periods thanks to the high efficiency of the system.
    Through optimal heat recovery in the System ET, the distillate temperature is maintained at a temperature (reference 20°C) considerably lower than the prescribed maximum temperature of 35°C