Process of obtaining zinc oxide having improved filtering...

Details Process of obtaining zinc oxide having improved filtering... Process of obtaining zinc oxide having improved filtering...

C - Chemistry, Metallurgy

02

F

362/46

C02F 9/00 (2006.01) C01G 9/02 (2006.01)

Patent

CA 1040325

ABSTRACT OF THE DISCLOSURE A process for improving the filtration characteris- tics of solids in neutralized waste liquor from a viscose process for manufacturing rayon filaments and which contains hydrated zinc oxide, which comprises elevating the temperature of the neutralized waste liquor and then treating the waste liquor to recover therefrom filterable solids including hydra- ted zinc oxide, characterized in that the temperature of the waste liquor is elevated to at least 125°C. under an elevated pressure sufficient to prevent essentially any loss of the water in the waste liquor until the room temperature filtration characteristic (as herein defined) of the neutralized waste liquor is increased by at least 50%.

221855

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