Method for dissolution and stabilization of silica-rich fibers

Jantzen, Carol M

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

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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.

Inventors:

Jantzen, Carol M ^[1]

Aiken, SC

Issue Date:: 1997-01-01

Research Org.:: Savannah River Site (SRS), Aiken, SC (United States)

OSTI Identifier:: 871224

Patent Number(s):: 5686365

Assignee:: United States Department of Energy (Washington, DC)

Patent Classifications (CPCs):: B - PERFORMING OPERATIONS B09 - DISPOSAL OF SOLID WASTE B09B - DISPOSAL OF SOLID WASTE

A - HUMAN NECESSITIES A62 - LIFE-SAVING A62D - CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS

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B - PERFORMING OPERATIONS B09 - DISPOSAL OF SOLID WASTE B09B - DISPOSAL OF SOLID WASTE
B09B3/0066 - {Disposal of asbestos}

A - HUMAN NECESSITIES A62 - LIFE-SAVING A62D - CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS
A62D3/36 - Detoxification by using acid or alkaline reagents
A62D2203/02 - Combined processes involving two or more distinct steps covered by groups A62D3/10 - A62D3/40

C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS
C03C25/66 - Chemical treatment, e.g. leaching, acid or alkali treatment

A - HUMAN NECESSITIES A62 - LIFE-SAVING A62D - CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS
A62D2101/41 - Inorganic fibres, e.g. asbestos

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10S65/901 - Liquid phase reaction process

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DOE Contract Number:: AC09-89SR18035

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: method; dissolution; stabilization; silica-rich; fibers; dissolving; borosilicate; fiberglass; asbestos; stabilize; disposal; comprises; immersing; hot; five-weight-percent; sodium; hydroxide; solution; concentration; dissolved; silica; reaches; equilibrium; residue; left; 48; hours; nitric; acid; dissolves; 96; adjusting; ph; caustic; added; waste; vitrification; stream; safe; useful; disposing; contaminated; heme; hepa; filters; hepa filter; sodium hydroxide; method comprises; nitric acid; safe disposal; method comprise; hydroxide solution; silica-rich fibers; oxide solution; /501/65/134/588/

Citation Formats


                    Jantzen, Carol M. Method for dissolution and stabilization of silica-rich fibers.  United States: N. p., 1997. 
        Web.

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                    Jantzen, Carol M. Method for dissolution and stabilization of silica-rich fibers.  United States.

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                    Jantzen, Carol M. Wed .  
        "Method for dissolution and stabilization of silica-rich fibers".  United States.  https://www.osti.gov/servlets/purl/871224.

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@article{osti_871224,

  title        = {Method for dissolution and stabilization of silica-rich fibers},

  author       = {Jantzen, Carol M},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1997},

  month        = {1}

}

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