Thermal spray vitrification process for the removal of lead-based paint from steel structures: An applications note |
| |
Authors: | A Kumar J Boy L D Stephenson |
| |
Affiliation: | (1) U.S. Army Engineer Research and Development Center (ERDC) Construction Engineering Research Laboratory (CERL), Champaign, IL |
| |
Abstract: | Lead-based paints and primers have long been used to protect steel structures from corrosion, but are now recognized as environmental
hazards. During lead-based paint removal via abrasive blasting, federal, state and local environmental requirements mandate
the use of containment structures to prevent contamination of air, soil, or water. The thermal spray vitrification (TSV) process
was developed and optimized in laboratory experiments to remove hazardous lead-based paint. TSV consists of thermal spraying
a molten glass onto the painted surface. As the glass strikes the substrate, it reacts with the paint, and organic components
are pyrolyzed, while lead ions are trapped on the glass surface. Quenching stresses in the glass cause it to crack and spall
off the substrate. The resulting glass fragments are collected, and further remelted to completely immobilize lead (Pb) ions
in the glassy iron (Fe) silicate matrix. The glass waste is thus rendered non-hazardous, as determined by the Toxicity Characteristic
Leaching Procedure (TCLP). The TSV process was field tested on a fire hydrant, using minimal personal protective equipment
and without using a containment structure. The lead-containing paint was removed, without producing hazardous waste, leaving
de-painted surfaces suitable for repainting. |
| |
Keywords: | lead-based paint paint removal steel structures thermal spray vitrification |
本文献已被 SpringerLink 等数据库收录! |
|