Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkali metal
Patent
1984-05-24
1985-05-14
Heller, Gregory A.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkali metal
423198, C01F 1136
Patent
active
045171645
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.
REFERENCES:
patent: 2375759 (1945-05-01), Kalichevsky et al.
Fiorucci et al., "Manufacture, Distribution, and Handling of Nitrate Salts for Solar Thermal Applications", Contract Report SAND81-8186, 11/1982, pp. 93-94.
Fiorucci Louis C.
Gregory Kevin M.
Clements Donald F.
Haglind James B.
Heller Gregory A.
Langel Wayne A.
Olin Corporation
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