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Title: Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts

Abstract

A method is described for 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. 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. 7 figs.

Inventors:
; ;
Issue Date:
Sponsoring Org.:
USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
OSTI Identifier:
672530
Patent Number(s):
5770085
Application Number:
PAN: 8-458,759; CNN: Grant RII-8902065; TRN: 99:001065
Assignee:
Idaho Research Foundation, Inc., Moscow, ID (United States)
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 23 Jun 1998
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 05 NUCLEAR FUELS; DEMETALLIZATION; LIQUID WASTES; SUPERCRITICAL GAS EXTRACTION; CARBON DIOXIDE; CHELATING AGENTS; INDUSTRIAL WASTES; SOLID WASTES; RADIOACTIVE WASTE PROCESSING; MATERIALS RECOVERY

Citation Formats

Wai, C M, Smart, N G, and Lin, Y. Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts. United States: N. p., 1998. Web.
Wai, C M, Smart, N G, & Lin, Y. Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts. United States.
Wai, C M, Smart, N G, and Lin, Y. Tue . "Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts". United States.
@article{osti_672530,
title = {Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts},
author = {Wai, C M and Smart, N G and Lin, Y},
abstractNote = {A method is described for 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. 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. 7 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {6}
}