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Title: Metals removal from spent salts

Abstract

A method and apparatus for removing metal contaminants from the spent salt of a molten salt oxidation (MSO) reactor is described. Spent salt is removed from the reactor and analyzed to determine the contaminants present and the carbonate concentration. The salt is dissolved in water, and one or more reagents may be added to precipitate the metal oxide and/or the metal as either metal oxide, metal hydroxide, or as a salt. The precipitated materials are filtered, dried and packaged for disposal as waste or can be immobilized as ceramic pellets. More than about 90% of the metals and mineral residues (ashes) present are removed by filtration. After filtration, salt solutions having a carbonate concentration >20% can be spray-dried and returned to the reactor for re-use. Salt solutions containing a carbonate concentration <20% require further clean-up using an ion exchange column, which yields salt solutions that contain less than 1.0 ppm of contaminants.

Inventors:
 [1];  [2];  [2];  [2];  [2];  [3]
  1. Pleasanton, CA
  2. Livermore, CA
  3. Danville, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
874662
Patent Number(s):
6436358
Assignee:
The Regents of the University of California (Oakland, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
metals; removal; spent; salts; method; apparatus; removing; metal; contaminants; salt; molten; oxidation; mso; reactor; described; removed; analyzed; determine; carbonate; concentration; dissolved; water; reagents; added; precipitate; oxide; andor; hydroxide; precipitated; materials; filtered; dried; packaged; disposal; waste; immobilized; ceramic; pellets; 90; mineral; residues; ashes; filtration; solutions; >20; spray-dried; returned; re-use; containing; <20; require; clean-up; exchange; column; yields; contain; 10; ppm; metal oxide; molten salt; salt solution; removing metal; metal contaminant; /423/

Citation Formats

Hsu, Peter C, Von Holtz, Erica H, Hipple, David L, Summers, Leslie J, Brummond, William A, and Adamson, Martyn G. Metals removal from spent salts. United States: N. p., 2002. Web.
Hsu, Peter C, Von Holtz, Erica H, Hipple, David L, Summers, Leslie J, Brummond, William A, & Adamson, Martyn G. Metals removal from spent salts. United States.
Hsu, Peter C, Von Holtz, Erica H, Hipple, David L, Summers, Leslie J, Brummond, William A, and Adamson, Martyn G. Tue . "Metals removal from spent salts". United States. https://www.osti.gov/servlets/purl/874662.
@article{osti_874662,
title = {Metals removal from spent salts},
author = {Hsu, Peter C and Von Holtz, Erica H and Hipple, David L and Summers, Leslie J and Brummond, William A and Adamson, Martyn G},
abstractNote = {A method and apparatus for removing metal contaminants from the spent salt of a molten salt oxidation (MSO) reactor is described. Spent salt is removed from the reactor and analyzed to determine the contaminants present and the carbonate concentration. The salt is dissolved in water, and one or more reagents may be added to precipitate the metal oxide and/or the metal as either metal oxide, metal hydroxide, or as a salt. The precipitated materials are filtered, dried and packaged for disposal as waste or can be immobilized as ceramic pellets. More than about 90% of the metals and mineral residues (ashes) present are removed by filtration. After filtration, salt solutions having a carbonate concentration >20% can be spray-dried and returned to the reactor for re-use. Salt solutions containing a carbonate concentration <20% require further clean-up using an ion exchange column, which yields salt solutions that contain less than 1.0 ppm of contaminants.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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