Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts
- Moscow, ID
A method of extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical carbon dioxide, containing a chelating agent is described. The chelating agent forms chelates that are soluble in the fluid to allow removal of the species from the material. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent comprises a trialkyl phosphate, a triaryl phosphate, a trialkylphosphine oxide, a triarylphosphine oxide, or mixtures thereof. The method provides an environmentally benign process for removing contaminants from industrial waste. The method is particularly useful for extracting actinides from acidic solutions, and the process can be aided by the addition of nitrate salts. The chelate and supercritical fluid can be regenerated, and the contaminant species recovered, to provide an economic, efficient process.
- DOE Contract Number:
- C85-110554
- Assignee:
- Idaho Research Foundation, Inc. (Moscow, ID)
- Patent Number(s):
- US 5770085
- OSTI ID:
- 871643
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
metals
metalloids
acidic
media
supercritical
fluids
salts
method
extracting
metalloid
metal
species
solid
liquid
material
exposing
fluid
solvent
particularly
carbon
dioxide
containing
chelating
agent
described
forms
chelates
soluble
allow
removal
preferred
embodiments
comprises
trialkyl
phosphate
triaryl
trialkylphosphine
oxide
triarylphosphine
mixtures
provides
environmentally
benign
process
removing
contaminants
industrial
waste
useful
actinides
solutions
aided
addition
nitrate
chelate
regenerated
contaminant
recovered
provide
economic
efficient
species recovered
benign process
agent forms
trialkyl phosphate
removing contaminants
extracting metal
allow removal
phosphine oxide
forms chelates
trialkylphosphine oxide
industrial waste
supercritical carbon
liquid material
environmentally benign
extraction solvent
metal species
preferred embodiments
supercritical fluid
carbon dioxide
preferred embodiment
particularly useful
chelating agent
method provides
efficient process
fluid solvent
agent comprises
acidic solution
method provide
acidic solutions
contaminant species
nitrate salts
acidic media
extracting metalloid
supercritical fluids
particularly supercritical
extracting actinides
nitrate salt
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