Used emulsions from Al- and Zn- casting

Mineral or synthetic oil, wax, siloxanes, emulsifiers, stabilizers

Die Casting is the most economical application for the processing of non-ferrous metal-alloys. During die casting liquid non-ferrous metal-alloys will be pressed into a form. After cooling down of the parts it is important to remove these pieces from the form easily. This is the reason for spraying the form with releasing emulsions. After removing the parts must be cleaned from surplus emulsions. For this step a water based repellent is used. These process liquid must be changed due to ageing or contamination. As emulsions have a water content of 95 - 99 %. Vacuum distillation is one of the most economical alternatives to the disposal of casting emulsions. The distillate can be reused for new releasing emulsions or for rinsing of parts. The residue is depending on its oil concentration, good for incineration or for disposal in the previous way.

When planning the unit the impurity grade of the emulsion has to be tested to see if the VACUDEST® unit can be made more profitable by adding a skimmer for the separation of free oils and/or a belt filter for the filtering of oiled particles. If a high distillate quality is required, a membrane filtration or active carbon filter can be added for the further reduction of the residual oil content.

Water recycling and the reduction of fresh water consumption is made equally possible by the treatment of used emulsions. The VACUDEST® system enables the waste disposal costs to be significantly reduced and the distillate can be reused, in contrast to conventional treatment technology (e.g. separation units).