Process for the selective recovery of the salt constituents from used hardening shop salts which contain nitrite-nitrate
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United States of America Patent
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Dec 8, 1998
Grant Date -
N/A
app pub date -
Apr 11, 1997
filing date -
Apr 13, 1996
priority date (Note) -
Expired
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Abstract
In order to recover in an environmentally sound and economic manner used hardening shop salts which contain nitrate-nitrite, the salts, comminuted to particle sizes of from 1 to 50 mm, are dissolved in a mixture of nitric acid and hydrogen peroxide without nitrogen oxides arising, and, by evaporation and cooling, potassium nitrate, sodium chloride, and sodium nitrate are obtained sequentially by fractional crystallization.
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