Thermal spray vitrification process for the removal of lead oxide contained in organic paints

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:379574

Karthikeyan, J; Chen, J; Bancke, G A; Herman, H; Berndt, C C ^[1]; Breslin, V T ^[2]

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1. State Univ. of New York, Stony Brook, NY (United States)
2. Marine Science Research Center, Stony Brook, NY (United States)

The US Environmental Protection Agency (US-EPA) regulations have necessitated the removal and containment of toxic lead from lead oxide containing paints. The Thermal Spray Vitrification Process (TSVP) is a novel technique in which a glass powder of appropriate composition is flame sprayed onto the painted surface to achieve removal and vitrification of the lead. Two different glass systems, i.e., alkali silicate and ferrous silicate, were chosen for detailed study. Appropriate amounts of raw materials were mixed, fused, quenched, ground and sieved to obtain the spray quality powders. Grit blasted mild steel coupons were used as test substrates for the spray parameter optimization studies; while those coupons with lead oxide containing organic paint were used for the lead removal experiments. The powders and deposits were investigated using Microtrac particle size analysis (for powders), optical microscopy, XRD and SEM. The remnant lead in the panel was measured using a specially prepared X-Ray Fluorescence (XRF) system. The lead leach rate was recorded as per US-EPA approved Toxicity Characteristic Leaching Procedure (TCLP). The results of this study have shown that lead oxide can be successfully removed form the paint by flame spraying a maximum of three layers of glass onto the painted surface. It is possible to obtain much higher lead removal rate with ferrous silicate glass as compared to alkali silicate glass is much higher than the ferrous silicate glass. The in situ vitrification has not been completely optimized; however, the lead containing glass coating can be remelted in situ or on site to enhance the vitrification of the lead which had been absorbed in the glass coating.

• OSTI ID: 379574
• Report Number(s): CONF-9509182--; ISBN 0-87170-541-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
ALKALI METAL COMPOUNDS
EXPERIMENTAL DATA
FLAME SPRAYING
GLASS
IRON COMPOUNDS
LEACHING
LEAD OXIDES
MICROSTRUCTURE
OPTICAL MICROSCOPY
PAINTS
PARTICLE SIZE
POWDERS
REMOVAL
SCANNING ELECTRON MICROSCOPY
SILICATES
TOXIC MATERIALS
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS