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Title: Purification of alkali metal nitrates

Abstract

A process is disclosed for removing heavy metal contaminants from impure alkali metal nitrates containing them. The process comprises mixing the impure nitrates with sufficient water to form a concentrated aqueous solution of the impure nitrates, adjusting the pH of the resulting solution to within the range of between about 2 and about 7, adding sufficient reducing agent to react with heavy metal contaminants within said solution, adjusting the pH of the solution containing reducing agent to effect precipitation of heavy metal impurities and separating the solid impurities from the resulting purified aqueous solution of alkali metal nitrates. The resulting purified solution of alkali metal nitrates may be heated to evaporate water therefrom to produce purified molten alkali metal nitrate suitable for use as a heat transfer medium. If desired, the purified molten form may be granulated and cooled to form discrete solid particles of alkali metal nitrates.

Inventors:
 [1];  [2]
  1. (Hamden, CT)
  2. (Woodridge, IL)
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
OSTI Identifier:
865454
Patent Number(s):
US 4517164
Application Number:
06/613,666
Assignee:
Olin Corporation (Cheshire, CT) SNL
DOE Contract Number:  
84-3878
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
purification; alkali; metal; nitrates; process; disclosed; removing; heavy; contaminants; impure; containing; comprises; mixing; sufficient; water; form; concentrated; aqueous; solution; adjusting; ph; resulting; range; adding; reducing; agent; react; effect; precipitation; impurities; separating; solid; purified; heated; evaporate; therefrom; produce; molten; nitrate; suitable; heat; transfer; medium; desired; granulated; cooled; discrete; particles; purified molten; adding sufficient; concentrated aqueous; resulting solution; molten form; sufficient water; metal nitrates; metal contaminants; heavy metal; solid particles; solution containing; alkali metal; heat transfer; aqueous solution; process comprises; reducing agent; molten alkali; transfer medium; removing heavy; metal nitrate; metal impurities; water therefrom; solid particle; comprises mixing; nitrates containing; form discrete; impure alkali; metal contaminant; /423/

Citation Formats

Fiorucci, Louis C., and Gregory, Kevin M. Purification of alkali metal nitrates. United States: N. p., 1985. Web.
Fiorucci, Louis C., & Gregory, Kevin M. Purification of alkali metal nitrates. United States.
Fiorucci, Louis C., and Gregory, Kevin M. Tue . "Purification of alkali metal nitrates". United States. https://www.osti.gov/servlets/purl/865454.
@article{osti_865454,
title = {Purification of alkali metal nitrates},
author = {Fiorucci, Louis C. and Gregory, Kevin M.},
abstractNote = {A process is disclosed for removing heavy metal contaminants from impure alkali metal nitrates containing them. The process comprises mixing the impure nitrates with sufficient water to form a concentrated aqueous solution of the impure nitrates, adjusting the pH of the resulting solution to within the range of between about 2 and about 7, adding sufficient reducing agent to react with heavy metal contaminants within said solution, adjusting the pH of the solution containing reducing agent to effect precipitation of heavy metal impurities and separating the solid impurities from the resulting purified aqueous solution of alkali metal nitrates. The resulting purified solution of alkali metal nitrates may be heated to evaporate water therefrom to produce purified molten alkali metal nitrate suitable for use as a heat transfer medium. If desired, the purified molten form may be granulated and cooled to form discrete solid particles of alkali metal nitrates.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {5}
}

Patent:

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