High Level Sand Reclamation
Technical Meeting 07 September 2009.
Photo: Phil Shakles and Colin Wood
The evening’s proceedings were opened by Branch President Dean Millington welcoming everyone to the first Technical Lecture of the new session. He was pleased to see such an excellent turn out for the meeting and outlined the subject matter for subsequent lectures as being deliberately varied to meet the interests of ferrous and non-ferrous foundry devotees alike.
Two presentations were made:
1) Colin Wood – the Kevin Cartwright Award for the best technical lecture for the 2008/9 session presented by immediate Past President Phil Shakles
2) Phil Shakles received his Past Presidents badge from Branch President Dean Millington
The evening’s speaker and topic were then introduced.
High Level Sand Reclamation using USR Secondary Attrition System
Presented by Chris Wilding, Omega Foundry Machinery
Chris began his talk by outlining important considerations when considering secondary attrition reclamation. The current proposals in landfill tax changes, raw material prices, the popularity of alkaline phenolic sands as well as the renaissance of the silicate process in foundries
The impending increase in landfill tax from £2.50 to £40.00 per tonne proposed by the Treasury with subsequent increases of £8 per tonne per annum year on year will have a massive impact on running costs to foundries that have high waste sand in their operation.
Actions need to be planned now to control the rise in foundry operating costs. Foundries with chemically bonded sand systems will need to maximise their reclamation to control the amount of waste sand generated.
Primary reclamation takes mould lumps down to grain size, normally using a ‘vibra-class’ unit coupled with a cooler classifier unit with associated extraction.
The best results in terms of the amount of reclaimed sand in the subsequent sand mix,with low binder additions is invariably achieved by ferrous foundries with good sand to metal ratios (4:1 is excellent) using an organic binder system.