Black manganese/iron oxide pigment, a process for its...

Details Black manganese/iron oxide pigment, a process for its... Black manganese/iron oxide pigment, a process for its...

C - Chemistry, Metallurgy

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C01G 49/02 (2006.01) C01G 45/02 (2006.01) C01G 49/00 (2006.01) C04B 14/30 (2006.01) C09C 1/22 (2006.01) C09C 1/24 (2006.01)

Patent

CA 2035528

A BLACK MANGANESE/IRON OXIDE PIGMENT, A PROCESS FOR ITS PRODUCTION AND ITS USE ABSTRACT OF THE DISCLOSURE A black manganese/iron oxide pigment having a spinel structure and having the composition MnxFe3-xO4 wherein x has a value from 0.1 to 0.9? is prepared by the steps: a) oxidizing iron(II) salts or mixtures of iron(II) salts and manganese(II) salts, in solution or after reaction with alkaline precipitants, with manganese dioxide or other compounds containing manganese in high valency, b) additionally oxidizing the salts of (a) to establish an Fe(III) content therein with another oxidizing agent, and c) filtering, washing, drying and grinding the pigment; and the pigment is useful for pigmenting building materials to a black color. LeA 27 315

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