A pelletized arsenic adsorbent and its method of preparation using the laterite rock and the ferromanganese slag

Name of the Inventor: Abhijit Maiti, Nishant Jain and Anil Kumar (PPE)

Application Number: 202211001060(IN)

Date of Patent Filing: 07.01.2022

Summary: The present invention relates to a system and method for an arsenic adsorbent with remarkable oxidation ability, efficiency to remove total arsenic, easy scalability, and, finally, economic viability. The arsenic adsorbent has been developed by combining the Laterite and the ferromanganese slag in the optimum proportion in a chemical treatment route. the preparation of a mixed arsenic adsorbent using natural rock and industrial waste. Laterite rock and the ferromanganese slag as a raw material were subjected to chemical treatment. Successively leach the active ingredients from both materials at optimal process conditions and then precipitate as mixed metal oxides/hydroxides. The adsorbents were prepared by tuning the elements Fe, Al, and Mn leaching concentration in the final solution before hydrolysis. Hence, Mn(IV) imposes the As(III) oxidation functionality, and Fe and Al oxide/hydroxide provide the active surface sites for the adsorption of arsenic species.