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Title: Method for treating materials for solidification

A method for treating materials such as wastes for solidification to form a solid, substantially nonleachable product. Addition of reactive silica rather than ordinary silica to the material when bringing the initial molar ratio of its silica constituent to a desired ratio within a preselected range increases the solubility and retention of the materials in the solidified matrix. Materials include hazardous, radioactive, mixed, and heavy metal species. Amounts of other constituents of the material, in addition to its silica content are also added so that the molar ratio of each of these constituents is within the preselected ranges for the final solidified product. The mixture is then solidified by cement solidification or vitrification. The method can be used to treat a variety of wastes, including but not limited to spent filter aids from waste water treatment, waste sludges, combinations of spent filter aids and waste sludges, combinations of supernate and waste sludges, incinerator ash, incinerator offgas blowdown, combinations of incinerator ash and offgas blowdown, cementitious wastes and contaminated soils.
 [1];  [1];  [2]
  1. (Aiken, SC)
  2. (N. Augusta, SC)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) SRS
Patent Number(s):
US 5434333
Contract Number:
Research Org:
Country of Publication:
United States
method; treating; materials; solidification; wastes; form; solid; substantially; nonleachable; product; addition; reactive; silica; ordinary; material; bringing; initial; molar; ratio; constituent; desired; preselected; range; increases; solubility; retention; solidified; matrix; hazardous; radioactive; mixed; heavy; metal; species; amounts; constituents; content; added; ranges; final; mixture; cement; vitrification; treat; variety; including; limited; spent; filter; aids; waste; water; treatment; sludges; combinations; supernate; incinerator; ash; offgas; blowdown; cementitious; contaminated; soils; selected range; waste sludges; contaminated soils; water treatment; contaminated soil; metal species; molar ratio; waste water; heavy metal; solidified product; spent filter; offgas blowdown; treating materials; filter aids; incinerator ash; reactive silica; desired ratio; incinerator offgas; treating material; preselected range; /588/501/976/