Method for dissolution and stabilization of silica-rich fibers

Details Method for dissolution and stabilization of silica-rich fibers Method for dissolution and stabilization of silica-rich fibers

1992-01-16

1997-11-11

Brunsman, David

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 12, 65901, 65 31, 134 2, 134 42, 588 1, 588 11, C04B 4153

Patent

active

056863659

ABSTRACT:
A method 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.

REFERENCES:
patent: 4514329 (1985-04-01), Wakabayashi et al.
patent: 4657875 (1987-04-01), Nakashima et al.
patent: 4808233 (1989-02-01), Pfannkoch
patent: 4995916 (1991-02-01), Meikrantz et al.
Chemical Abstracts vol. 104, No. 14 104:112265n (1986) No Month Avail.
Chemical Abstracts vol. 114 No. 16 114:149895a (1991) No Month Avail.

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