Back to results
US 11,519,053 B2Granted
Method for the treatment of iron-containing sludge
AssigneeArcelorMittal
InventorSeverine Giordana
Life of this patent
Estimating the term…
Abstract
The present invention provides a method for the treatment of sludge containing iron and between 4.5% to 12% by weight of zinc. This method includes a leaching step wherein leaching agents include hydrochloric acid and chlorate, and wherein the pH of the leachate directly resulting from this leaching step is set at a value below 1.5. A recycling method and treatment installation are also provided.
Claims22
A method for the treatment of sludge, the method comprising the step of
- providing sludge, the sludge including iron and between 4.5% to 12% by weight of zinc;
- providing leaching agents, the leaching agents consisting of hydrochloric acid and chlorate;
- leaching the sludge with the leaching agents to form a leachate, a pH of leachate directly resulting from this leaching step being less than 1.5.
A method for the treatment of sludge, the method comprising the step of
- providing sludge, the sludge including iron and between 4.5% to 12% by weight of zinc;
- providing leaching agents, the leaching agents consisting of hydrochloric acid and chlorate;
- leaching the sludge with the leaching agents to form a leachate, a pH of leachate directly resulting from this leaching step being greater than or equal to 0.8 and less than 1.5.
A method for the treatment of sludge, the method comprising the step of
- providing sludge, the sludge including iron and between 4.5% to 12% by weight of zinc;
- providing leaching agents, the leaching agents consisting of hydrochloric acid and chlorate;
- leaching the sludge with the leaching agents to form a leachate, a pH of leachate directly resulting from this leaching step being greater than or equal to 0.8 and less than 1.5,
- wherein a final product is a sludge containing less than 0.40% by weight in zinc and less than 0.10% by weight in lead.
1 more element
Dependencies are inferred from the claim text.