Green sand reclamation using fluidized bed with an attrition nozzle

Cruz, Nestor, Briens, Cedric and Berruti, Franco (2009) Green sand reclamation using fluidized bed with an attrition nozzle. Resources, Conservation and Recycling, 54 1: 45-52. doi:10.1016/j.resconrec.2009.06.006

Author Cruz, Nestor
Briens, Cedric
Berruti, Franco
Title Green sand reclamation using fluidized bed with an attrition nozzle
Journal name Resources, Conservation and Recycling   Check publisher's open access policy
ISSN 0921-3449
Publication date 2009-11
Sub-type Article (original research)
DOI 10.1016/j.resconrec.2009.06.006
Volume 54
Issue 1
Start page 45
End page 52
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
The objective of this study was to determine the technical feasibility of green sand reclamation using attrition in a gas–solid fluidized bed. Reclamation of foundry sand is becoming important as it may help solve concerns related to transportation and dumping of the used sand, and reduce production costs by recycling sand. The crucial step in green sand reclamation is the removal of small clay particles that are bound to the sand particles.

For this study two different types of green sand were used and supplied by two different foundries. Tests were performed in a fluidized bed equipped with an attrition nozzle operating at pressures of either 350 or 550 kPa (50 or 80 psig). Attrition experiments for one green sand were performed on either unburned or burned (calcined) green sand, to determine the effect of prior calcination of the green sand on its reclamation potential by attrition. Calcination temperatures of over 700 °C were employed, and the results suggest that calcination facilitates the removal of clay from the green sand.

Green sand was analyzed for clay and organic content, acid request, and particle size before and after attrition. Attriting calcined green sand produces the best results. Also experiments conducted at the highest attrition pressure of 550 kPa gave good results. According to the mass balance, the mass lost during the attrition process may be limited to less than 14%, and this could be considered acceptable. The volume of air required for the attrition nozzle is rather high and this may adversely affect the economics of the process.
Keyword Green sand
Foundry sand
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Tue, 20 Sep 2011, 13:42:01 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre