Back to results
US 8,377,310 B2Granted
Method and composition for sorbing toxic substances
AssigneeJ.I. Enterprises, Inc.
InventorJoseph Iannicelli
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeJ.I. Enterprises, Inc.
InventorJoseph Iannicelli
Estimating the term…
Toxic substances such as heavy metals are extracted from a medium using a sorbent composition. The sorbent composition is derived by sulfidation of red mud, which contains hydrated ferric oxides derived from the Bayer processing of bauxite ores. Exemplary sulfidizing compounds are H2S, Na2S, K2S, (NH4)2S, and CaSx. The sulfur content typically is from about 0.2 to about 10% above the residual sulfur in the red mud. Sulfidized red mud is an improved sorbent compared to red mud for most of the heavy metals tested (Hg, Cr, Pb, Cu, Zn, Cd, Se, Th, and U). Unlike red mud, sulfidized red mud does not leach naturally contained metals. Sulfidized red mud also prevents leaching of metals when mixed with red mud. Mixtures of sulfidized red mud and red mud are more effective for sorbing other ions, such as As, Co, Mn, and Sr, than sulfidized red mud alone.
A process of extracting heavy metal ions from water comprising contacting the water with red mud and a sorbent comprising sulfidized red mud, the sulfidized red mud being a reaction product of a sulfidizing compound and red mud at a reaction temperature from ambient temperature up to about 200° C. and a reaction pressure from atmospheric pressure up to about 30 psi in aqueous solution.
A process of treating water containing heavy metal ions, the process comprising contacting the water with a sorbent comprising sulfidized red mud, the sulfidized red mud being a reaction product of a sulfidizing compound and red mud at a reaction temperature from ambient temperature up to about 200° C. and a reaction pressure from atmospheric pressure up to about 30 psi in aqueous solution.
A process of extracting heavy metal ions from a medium, comprising contacting the medium with a sorbent comprising sulfidized red mud, the sulfidized red mud comprising a reaction product of a sulfidizing compound and red mud at a reaction temperature up to about 200° C. and a reaction pressure from atmospheric pressure up to about 30 psi in an aqueous slurry.
Dependencies are inferred from the claim text.