Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2009-08-07
2010-10-05
Bos, Steven (Department: 1793)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S681000, C210S682000, C210S912000, C210S913000, C210S914000, C210S679000, C423S006000, C423S024000, C423S054000, C423S089000, C423S099000, C423S658500, C502S400000, C502S406000
Reexamination Certificate
active
07807058
ABSTRACT:
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.
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Banner & Witcoff , Ltd.
Bos Steven
Darji Pritesh
J.I. Enterprises, Inc.
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