A method and a device for reclaiming green waste foundry sand
A method and a device for reclaiming green waste foundry sand The green waste foundry sand having deactivated binder coating is subjected to external attrition in a rotary non-perforated drum having a feed end and a discharge end and rotating about a horizontal axis at 20-50 rpm by feeding the sand into the non-perforated drum at a feed rate of 1.4 – 2.0 kg/minute and allowing a residence time of 20-40 minutes for the sand in the non-perforated drum. The sand emerging from the non-perforated drum is subjected to inter-particle attrition in a rotary perforated drum rotating with the non-perforated drum about the same horizontal axis. The sand is allowed a residence time of 5-15 minutes in the perforated drum. The volume ratio between the non-perforated drum and the perforated drum is 2.5 to 4.
To reclaim waste foundry green sand in an affordable way and thereby use it again in the foundry. The use of reclaimed sand in small scale foundries would improve the economics and efficiency of the process. It also proposes the best possible use of fines (dead clay) generated during reclamation.
Reclamation of waste foundry sand for small & medium scale foundries to make the foundry operations economically viable and reduce dumping of waste which otherwise is an environmental and health hazard.
Two-stage attrition device involves only mechanical treatment and only dead clay coating is removed from sand grains without affecting the sand properties
- Two-stage attrition device for small scale foundries
- A big plant for foundry clusters (say 20-25 foundries)
- Complete analysis of reclaimed sand
- Recommendation for better casting based on the analysis
- Best possible use of fines generated in reclamation
- Retrofitting of two-stage device in foundries at their existing sand plant
The disposal of Waste Foundry Sand (WFS) is a significant challenge for the foundry industry due to its content of toxic heavy metals and particulate matter, making it a serious environmental and health hazard. While research has explored using WFS in industries like construction and ceramics, there has been limited focus on reclaiming and reusing waste sand within the foundry itself. Although large-scale reclamation solutions exist, they are neither suitable nor economical for small and medium-scale foundries. Implementing reclaimed sand within foundries could enhance both the efficiency and economics of the process, while also reducing environmental impact.
Small and medium-scale foundries, Construction Industry, Ceramics Industry, Land Reclamation, Agriculture