American Air Liquide, Inc.

Sylvester Zuttah

Rovshan Mahmudov

Method for removing arsenic mineral from a lead concentrate by reverse flotation with an ozone pre-treatment. The method comprises the steps of: receiving a slurry of the lead concentrate that has previously undergone flotation processes, bubbling ozone into the slurry of the lead concentrate to remove reagents used in previous flotation processes, adding a sulfide salt to the slurry to depress lead mineral, adding an alkali to increase the pH of the slurry, adding a collector and then a frother to the slurry for a reverse flotation processing and floating the arsenic mineral out of the lead mineral to obtain a now-purified lead concentrate.

Arsenic removal from lead concentrate by ozone treatment and reverse flotation

A method for recovery of aluminum hydroxide Al(OH)from an aluminum enriched water/wastewater treatment sludge is disclosed. The method includes the steps of: adding a hydrated lime slurry to the aluminum enriched water/wastewater treatment sludge to form an alkaline sludge; adding sodium carbonate NaCOto the alkaline sludge to form a NaCOtreated sludge; forming a first supernatant from the NaCOtreated sludge of step b) containing NaAl(OH); introducing COto the first supernatant to form a precipitate of Al(OH)and a second supernatant containing NaHCO; and recycling at least a portion of the NaHCOfrom the second supernatant back to the alkaline sludge of step a).

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Bear, DE, United States of America

Sylvester Zuttah