Iron-phosphate ceramics for solidification of mixed low-level waste

Patent · Sat Jan 01 00:00:00 EST 2000

OSTI ID:873036

Aloy, Albert S ^[1]; Kovarskaya, Elena N ^[1]; Koltsova, Tatiana I ^[1]; Macheret, Yevgeny ^[2]; Medvedev, Pavel G ^[3]; Todd, Terry ^[4]

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1. St. Petersburg, RU
2. Idaho Falls, ID
3. Ozersk, RU
4. Aberdeen, ID

A method of immobilizing mixed low-level waste is provided which uses low cost materials and has a relatively long hardening period. The method includes: forming a mixture of iron oxide powders having ratios, in mass %, of FeO:Fe.sub.2 O.sub.3 :Fe.sub.3 O.sub.4 equal to 25-40:40-10:35-50, or weighing a definite amount of magnetite powder. Metallurgical cinder can also be used as the source of iron oxides. A solution of the orthophosphoric acid, or a solution of the orthophosphoric acid and ferric oxide, is formed and a powder phase of low-level waste and the mixture of iron oxide powders or cinder (or magnetite powder) is also formed. The acid solution is mixed with the powder phase to form a slurry with the ratio of components (mass %) of waste:iron oxide powders or magnetite:acid solution=30-60:15-10:55-30. The slurry is blended to form a homogeneous mixture which is cured at room temperature to form the final product.

• Research Organization: Russian Federation of Atomic Energy
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 6075176
• OSTI ID: 873036
• Country of Publication: United States
• Language: English

Related Subjects

iron-phosphate
ceramics
solidification
mixed
low-level
waste
method
immobilizing
provided
cost
materials
relatively
hardening
period
forming
mixture
iron
oxide
powders
ratios
mass
feo
equal
25-40
40-10
35-50
weighing
definite
amount
magnetite
powder
metallurgical
cinder
source
oxides
solution
orthophosphoric
acid
ferric
formed
phase
form
slurry
ratio
components
30-60
15-10
55-30
blended
homogeneous
cured
temperature
final
product
phosphate ceramic
acid solution
phosphoric acid
iron oxide
oxide powder
oxide powders
homogeneous mixture
final product
level waste
ferric oxide
low-level waste
iron oxides
mixed low-level
immobilizing mixed
phosphate ceramics
/588/501/976/