Method for recycling heat treating salts

Details Method for recycling heat treating salts Method for recycling heat treating salts

1977-11-18

1979-06-19

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

148 15, 423399, C21D 146

Patent

active

041585798

ABSTRACT:
A system for recycling heat treating salts such as nitrates and nitrites from a rinse bath including means to prevent the excessive build-up of impurities such as carbonates or chlorides which impair heat treat efficiency. For example, carbonates which form in a nitrate-nitrite quench bath and chlorides which are carried by drag-out into a nitrate-nitrite quench bath from a chloride heat treating bath are removed by concentrating the rinse water, removing undesirable components from the concentrate and returning molten rectified salt to the quench.

REFERENCES:
patent: 3793208 (1974-02-01), Foreman
patent: 3847597 (1974-11-01), Mueller et al.
patent: 3953248 (1976-04-01), Coch
patent: 3966508 (1976-06-01), Mohr

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