Method for treating waste pickle liquor
OwnerSatish C. Wadhawaninventor
Life of this patent
Estimating the term…
Abstract
A method for treating waste pickle liquor solution comprising the steps of (a) adding a flocculating agent to the pickle liquor solution; (b) allowing at least some of the silica in the pickle liquor to begin to flocculate; (c) again adding a flocculating agent to the pickle liquor solution; (d) allowing the floccules containing silica formed in step (b) to increase in size; and (e) physically separating floccules formed in step (d) from the pickle liquor solution.
Claims14
A method for treating waste pickle liquor solution containing silica comprising the steps of:
- (a) adding a cationic polymer flocculating agent having an average molecular weight of from about 2,000 to about 10,000 to the pickle liquor solution;
- (b) allowing at least some of the silica in the pickle liquor to form floccules containing silica having a diameter of from about 0.5 microns to about 2.0 microns;
- (c) adding an anionic polymer flocculating agent having an average molecular weight of from about 1,000 to about 20,000,000 to the pickle liquor solution;
- (d) allowing the floccules containing silica formed in step (b) to increase in size to a diameter of from about 25 microns to about 100 microns;
- and
- (e) physically separating floccules formed in step (d) from the pickle liquor solution.
The method of claim 16 wherein in step (d) floccules are allowed to form for a period of from about 15 minutes to about 1 hour.
Dependencies are inferred from the claim text.