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Title: Conversion of geothermal waste to commercial products including silica

Abstract

A process for the treatment of geothermal residue includes contacting the pigmented amorphous silica-containing component with a depigmenting reagent one or more times to depigment the silica and produce a mixture containing depigmented amorphous silica and depigmenting reagent containing pigment material; separating the depigmented amorphous silica and from the depigmenting reagent to yield depigmented amorphous silica. Before or after the depigmenting contacting, the geothermal residue or depigmented silica can be treated with a metal solubilizing agent to produce another mixture containing pigmented or unpigmented amorphous silica-containing component and a solubilized metal-containing component; separating these components from each other to produce an amorphous silica product substantially devoid of metals and at least partially devoid of pigment. The amorphous silica product can be neutralized and thereafter dried at a temperature from about 25.degree. C. to 300.degree. C. The morphology of the silica product can be varied through the process conditions including sequence contacting steps, pH of depigmenting reagent, neutralization and drying conditions to tailor the amorphous silica for commercial use in products including filler for paint, paper, rubber and polymers, and chromatographic material.

Inventors:
 [1];  [2]
  1. (East Moriches, NY)
  2. (Rocky Point, NY)
Issue Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY
OSTI Identifier:
875126
Patent Number(s):
6537796
Assignee:
Brookhaven Science Associates, LLC (Upton, NY) BNL
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
conversion; geothermal; waste; commercial; products; including; silica; process; treatment; residue; contacting; pigmented; amorphous; silica-containing; component; depigmenting; reagent; times; depigment; produce; mixture; containing; depigmented; pigment; material; separating; yield; treated; metal; solubilizing; agent; unpigmented; solubilized; metal-containing; components; product; substantially; devoid; metals; partially; neutralized; thereafter; dried; temperature; 25degree; 300degree; morphology; varied; conditions; sequence; steps; ph; neutralization; drying; tailor; filler; paint; paper; rubber; polymers; chromatographic; /435/423/

Citation Formats

Premuzic, Eugene T., and Lin, Mow S. Conversion of geothermal waste to commercial products including silica. United States: N. p., 2003. Web.
Premuzic, Eugene T., & Lin, Mow S. Conversion of geothermal waste to commercial products including silica. United States.
Premuzic, Eugene T., and Lin, Mow S. Wed . "Conversion of geothermal waste to commercial products including silica". United States. https://www.osti.gov/servlets/purl/875126.
@article{osti_875126,
title = {Conversion of geothermal waste to commercial products including silica},
author = {Premuzic, Eugene T. and Lin, Mow S.},
abstractNote = {A process for the treatment of geothermal residue includes contacting the pigmented amorphous silica-containing component with a depigmenting reagent one or more times to depigment the silica and produce a mixture containing depigmented amorphous silica and depigmenting reagent containing pigment material; separating the depigmented amorphous silica and from the depigmenting reagent to yield depigmented amorphous silica. Before or after the depigmenting contacting, the geothermal residue or depigmented silica can be treated with a metal solubilizing agent to produce another mixture containing pigmented or unpigmented amorphous silica-containing component and a solubilized metal-containing component; separating these components from each other to produce an amorphous silica product substantially devoid of metals and at least partially devoid of pigment. The amorphous silica product can be neutralized and thereafter dried at a temperature from about 25.degree. C. to 300.degree. C. The morphology of the silica product can be varied through the process conditions including sequence contacting steps, pH of depigmenting reagent, neutralization and drying conditions to tailor the amorphous silica for commercial use in products including filler for paint, paper, rubber and polymers, and chromatographic material.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {1}
}

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