Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1989-09-28
1991-10-08
Silverman, Stanley
Liquid purification or separation
Processes
Ion exchange or selective sorption
210688, 210904, 423 25, 423 29, 502415, C02F 128
Patent
active
050551990
ABSTRACT:
A method for reducing the amount of anionic metal-ligand complex in a solution comprises: (a) contacting the solution with a substance selected from: a compound having the formula: A.sub.w B.sub.x (OH).sub.y C.sub.z.nH.sub.2 O, wherein A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to tetravalent anion, and w, x, y, z and n satisfy the following: 0.ltoreq. z.ltoreq.x.ltoreq.4.ltoreq.w.ltoreq.1/2y and 12.gtoreq.n.gtoreq.1/2(w-x); a calcined product of said compound and mixtures thereof; and (b) separating the substance from the solution. A method for removing substantially all metal-cyanide, -thiocyanate, -thiosulfate, -citrate and/or -EDTA complex from a solution containing one or more of said complexes is also disclosed. The latter method comprises contacting the solution with a sufficient amount of substance consisting essentially of a compound selected from: hydrotalcite, calcined hydrotalcite and mixtures thereof; and separating the substance from the solution.
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Chen Abraham S. C.
Misra Chanakya
O'Neill Gary A.
Aluminum Company of America
Silverman Stanley
Topolosky Gary P.
Upton Christopher
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