Method for improving the brightness of aluminum hydroxide

Details Method for improving the brightness of aluminum hydroxide Method for improving the brightness of aluminum hydroxide

C - Chemistry, Metallurgy

01

F

C01F 7/46 (2006.01) C01F 7/04 (2006.01)

Patent

CA 2136386

A method (Fig. 1a) for improving the brightness level of aluminum hydroxide removed from a caustic solution comprises contacting the solution with an adsorbent comprising a calcined compound having the formula: AwBx(OH)yCz.nH2O wherein A represents a divalent metal cation selected from the group consisting of: Mg2+, Ni2+, Fe2+, Ca2+ and Zn2+; B represents a trivalent metal cation selected from the group consisting of: Al3+, Fe3+ and Cu3+; C represents a mono- to tetravalent anion selected from the group consisting of: OH- , Cl- , Br- , NO3- , CH3COO- , C2O42-, CO32- , SO42- , PO43- , Fe(CN)63- and Fe(CN)64-; and w, x, y, z and n satisfy the following: 0 < z x 4 w y and 12 n 1/2 (w-x); and filtering the solution before and/or after said contacting. A preferred adsorbent comprises calcined hydrotalcite. An improved aluminum hydroxide product having a whiteness level of 85% or higher based on a 100% TiO2 reference standard, having been removed from a caustic solution and decolorized by the foregoing method, is obtained.

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