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Title: Method for dissolution and stabilization of silica-rich fibers

Abstract

A method is described for dissolving silica-rich fibers such as borosilicate fibers, fiberglass and asbestos to stabilize them for disposal. The method comprises (1) immersing the fibers in hot, five-weight-percent sodium hydroxide solution until the concentration of dissolved silica reaches equilibrium and a only a residue is left (about 48 hours), then immersing the residue in hot, five-weight-percent nitric acid until the residue dissolves (about 96 hours). After adjusting the pH of the dissolved fibers to be caustic, the solution can then be added to a waste vitrification stream for safe disposal. The method is useful in disposing contaminated HEME and HEPA filters. 1 fig.

Inventors:
Issue Date:
Research Org.:
Westinghouse Savannah River Co
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
563665
Patent Number(s):
5,686,365
Application Number:
PAN: 7-821,653; TRN: 98:002121
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 052001; PA: EDB-98:013376; SN: 98001896359
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 11 Nov 1997
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; BOROSILICATE GLASS; FIBERGLASS; ASBESTOS; DISSOLUTION; AIR FILTERS; SODIUM HYDROXIDES; NITRIC ACID; VITRIFICATION; HEME; RADIOACTIVE WASTE PROCESSING

Citation Formats

Jantzen, C.M. Method for dissolution and stabilization of silica-rich fibers. United States: N. p., 1997. Web.
Jantzen, C.M. Method for dissolution and stabilization of silica-rich fibers. United States.
Jantzen, C.M. Tue . "Method for dissolution and stabilization of silica-rich fibers". United States.
@article{osti_563665,
title = {Method for dissolution and stabilization of silica-rich fibers},
author = {Jantzen, C.M.},
abstractNote = {A method is described for dissolving silica-rich fibers such as borosilicate fibers, fiberglass and asbestos to stabilize them for disposal. The method comprises (1) immersing the fibers in hot, five-weight-percent sodium hydroxide solution until the concentration of dissolved silica reaches equilibrium and a only a residue is left (about 48 hours), then immersing the residue in hot, five-weight-percent nitric acid until the residue dissolves (about 96 hours). After adjusting the pH of the dissolved fibers to be caustic, the solution can then be added to a waste vitrification stream for safe disposal. The method is useful in disposing contaminated HEME and HEPA filters. 1 fig.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {11}
}