The regeneration of waste foundry sand and residue stabilization using coal refuse.
Summary of "The regeneration of waste foundry sand and residue stabilization using coal refuse."
The processes for recycling waste foundry sand are divided between regeneration and beneficial reuse, and the potential for regeneration is higher than that of reuse. In this study, two processes for the recycling and residue stabilization of waste foundry sands were considered. One is the dry mechanical process for recycling, and the other is the stabilization process for powdered residue. The dry mechanical process of regeneration consists of crushing, grinding, separation, and classification. To stabilize the residues that were generated through the regeneration process, powdered residues were pelletized by a high-shear pelletizer, and the surfaces of the pellets were subsequently coated with coal refuse powders that contained sodium silicate as a binder. Coated pellets were sintered by a self-propagating combustion method. The refractory index of the recycled sands, as measured by the Seger cone method, was over -34, and their SiO(2) contents of 94% was similar to that of green sand. The general conclusion that coal refuse and sodium silicate stabilize heavy metals better than other processes may lead to the development of a cost-effective solution for stabilizing heavy metals in residues.
Affiliation
Institute of Materials Processing, Michigan Technological University, Houghton, MI 49931, USA; Korea Institute of Geoscience & Mineral Resources (KIGAM), 30 Kajeong-dong, Yuseong-gu, Daejeon 305-350, Republic of Korea.
Journal Details
This article was published in the following journal.
Name: Journal of hazardous materials
ISSN: 1873-3336
Pages: 176-82
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22197564
- DOI: http://dx.doi.org/10.1016/j.jhazmat.2011.11.100
Medical and Biotech [MESH] Definitions
Coke
A residue of coal, left after dry (destructive) distillation, used as a fuel.
Hazardous Waste
Waste products which, upon release into the atmosphere, water or soil, cause health risks to humans or animals through skin contact, inhalation or ingestion. Hazardous waste sites which contain hazardous waste substances go here.
Bioprosthesis
Prosthesis, usually heart valve, composed of biological material and whose durability depends upon the stability of the material after pretreatment, rather than regeneration by host cell ingrowth. Durability is achieved 1, mechanically by the interposition of a cloth, usually polytetrafluoroethylene, between the host and the graft, and 2, chemically by stabilization of the tissue by intermolecular linking, usually with glutaraldehyde, after removal of antigenic components, or the use of reconstituted and restructured biopolymers.
Medical Waste Disposal
Management, removal, and elimination of biologic, infectious, pathologic, and dental waste. The concept includes blood, mucus, tissue removed at surgery or autopsy, soiled surgical dressings, and other materials requiring special control and handling. Disposal may take place where the waste is generated or elsewhere.
Waste Disposal, Fluid
The discarding or destroying of liquid waste products or their transformation into something useful or innocuous.
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