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Title: Method for stabilizing low-level mixed wastes at room temperature

A method to stabilize solid and liquid waste at room temperature is provided comprising combining solid waste with a starter oxide to obtain a powder, contacting the powder with an acid solution to create a slurry, said acid solution containing the liquid waste, shaping the now-mixed slurry into a predetermined form, and allowing the now-formed slurry to set. The invention also provides for a method to encapsulate and stabilize waste containing cesium comprising combining the waste with Zr(OH).sub.4 to create a solid-phase mixture, mixing phosphoric acid with the solid-phase mixture to create a slurry, subjecting the slurry to pressure; and allowing the now pressurized slurry to set. Lastly, the invention provides for a method to stabilize liquid waste, comprising supplying a powder containing magnesium, sodium and phosphate in predetermined proportions, mixing said powder with the liquid waste, such as tritium, and allowing the resulting slurry to set.
 [1];  [2]
  1. (Joliet, IL)
  2. (Westmont, IL)
Issue Date:
OSTI Identifier:
University of Chicago (Chicago, IL) ANL
Patent Number(s):
US 5645518
Contract Number:
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
method; stabilizing; low-level; mixed; wastes; temperature; stabilize; solid; liquid; waste; provided; comprising; combining; starter; oxide; obtain; powder; contacting; acid; solution; create; slurry; containing; shaping; now-mixed; predetermined; form; allowing; now-formed; set; provides; encapsulate; cesium; zr; oh; solid-phase; mixture; mixing; phosphoric; subjecting; pressure; pressurized; lastly; supplying; magnesium; sodium; phosphate; proportions; tritium; resulting; comprising supplying; mixed waste; mixed wastes; acid solution; solution containing; provided comprising; phosphoric acid; liquid waste; solid waste; waste containing; predetermined proportion; comprising combining; resulting slurry; phase mixture; containing cesium; containing magnesium; /588/501/