Low-temperature setting phosphate ceramics for stabilization of DOE problem low level mixed-waste: I. Material and waste form development

Conference · Tue Mar 01 04:00:00 EST 1994

OSTI ID:10142406

Singh, D; Wagh, A; Knox, L ^[1]; Mayberry, J ^[2]

---

1. Argonne National Lab., Argonne, IL (United States)
2. Science Applications International Corp., Idaho Falls, ID (United States)

Chemically bonded phosphate ceramics are proposed as candidates for solidification and stabilization of some of the {open_quotes}problem{close_quotes} DOE low-level mixed wastes at low-temperatures. Development of these materials is crucial for stabilization of waste streams which have volatile species and any use of high-temperature technology leads to generation of off-gas secondary waste streams. Several phosphates of Mg, Al, and Zr have been investigated as candidate materials. Monoliths of these phosphates were synthesized using chemical routes at room or slightly elevated temperatures. Detailed physical and chemical characterizations have been conducted on some of these phosphates to establish their durability. Magnesium ammonium phosphate has shown to possess excellent mechanical and as well chemical properties. These phosphates were also used to stabilize a surrogate ash waste with a loading ranging from 25-35 wt.%. Characterization of the final waste forms show that waste immobilization is due to both chemical stabilization and physical encapsulation of the surrogate waste which is desirable for waste immobilization.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10142406
• Report Number(s): ANL/ET/CP--80828; CONF-940225--94; ON: DE94009818
• Country of Publication: United States
• Language: English

Related Subjects

052001
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360202
360203
CERAMICS
CHEMICAL PROPERTIES
ENCAPSULATION
LOW-LEVEL RADIOACTIVE WASTES
MAGNESIUM PHOSPHATES
MECHANICAL PROPERTIES
RADIOACTIVE WASTE PROCESSING
SOLIDIFICATION
STRUCTURE AND PHASE STUDIES
TECHNOLOGY ASSESSMENT
TEMPERATURE RANGE 0065-0273 K
WASTE FORMS
WASTE PROCESSING