Magnesium hydroxide to prevent corrosion caused by water spray in continuous casting
AssigneeNalco Chemical Company
InventorGeorge B. Waltman
Life of this patent
Estimating the term…
Abstract
Magnesium hydroxide is added to aqueous sprays used in the cooling of steel produced by continuous casting to reduce the corrosion of ferrous metals in contact with these sprays. The magnesium hydroxide when added to aqueous sprays used in the cooling of steel produced by continuous casting further reduces the potential for calcium fluoride scale formation by reducing the fluoride content of the system water.
Claims7
An improved process for reducing the corrosion of ferrous metal equipment in a continuous casting operation comprising spraying a cast steel product with water, collecting the water in a scale pit and recycling the water, the improvement comprising adding an effective amount of an aqueous slurry of magnesium hydroxide to the collected water to maintain the pH of the water between 8.5 to 9.5 prior to recycling.
A process for reducing the fluoride content of spray water used to cool steel produced by continuous casting comprising:
- collecting the spray water in a scale pit;
- adding an effective amount of an aqueous slurry of magnesium hydroxide to the collected water to adsorb the fluoride;
- and
- removing the adsorbed fluoride through by filtration prior to recycling the water.
Dependencies are inferred from the claim text.