Letter 8015

Recycling spent die strip caustic 

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I have been working with Brian Tomkins on the use of 308A die strip additive to speed up the stripping of dies and the trials were successful. Brian further proposed the use of the spent die strip caustic in anodising etch operation, something we are currently pursuing. I would like to know the further additives that we need to use to prevent the adverse effect of the dissolved aluminium carried over from die strip. Currently we are using almeco plus 2 to hold aluminium ions in solution in our anodising etch but we are having problems on the accumulation of sludge in the etch tank which is affecting the heating up of the tank.

Please can you suggest an alternative.

Noah Nyemba
Almin Metal Industries - Harare, Zimbabwe

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