Production of CICPs

CICPs are made by calcination (strong heating in air) of blends of metal oxides and/or oxide precursors such as metal salts, hydrates, and carbonates. Calcination temperatures typically range from 650 to 1300 °C. At relatively low temperatures, all the raw ingredients decompose to form the metal oxides. At higher tempera­tures, this oxide mix becomes reactive. Metal and oxide ions become mobile and interdiffuse to create a homogeneous solid. The ions in the solid then rearrange to a stable crystalline structure that is determined by the metals present, the O/M ratio, and the calcining temperature. This new structure is the color pigment. Fol­lowing calcination, CICPs are milled to achieve a specific particle size, often washed, and finally blended for uniformity.

Three main groups of CICPs are commercially produced. Titanates, which use a titanium dioxide base, aluminates, which use an aluminum oxide base, and chromites and ferrites, which have chromium and/or iron oxide bases.

5.4

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