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

Abstract

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.

Inventors:
 [1];  [1];  [1]
  1. Moscow, ID
Publication Date:
OSTI Identifier:
871643
Patent Number(s):
US 5770085
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID)
DOE Contract Number:  
C85-110554
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
extraction; 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; /210/423/

Citation Formats

Wai, Chien M, Smart, Neil G, and Lin, Yuehe. Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts. United States: N. p., 1998. Web.
Wai, Chien M, Smart, Neil G, & Lin, Yuehe. Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts. United States.
Wai, Chien M, Smart, Neil G, and Lin, Yuehe. Thu . "Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts". United States. https://www.osti.gov/servlets/purl/871643.
@article{osti_871643,
title = {Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts},
author = {Wai, Chien M and Smart, Neil G and Lin, Yuehe},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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