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Phosphogypsum as a Pigment for Paper Coating

Korczyński A., Ludomirska I., Proga H.

Polish Journal of Chemical Technology

2002

Vol. 4, nr 1

12-14

Phosphogypsum is a good carrier for joint deposition of modifying kaolin pigment for paper coatings. The test shows that hydrated gypsum grades which are waste products in phosphorous acid plants are suitable for paper coatings, giving glossy and matte surfaces for both web offset and rotogravure printing. The neutralisation of the raw phosphogypsum and grains size dimensions equalisation one-step procedures were developed. The printing properties of the paper coated with the combined gypsum-kaolinite colour were described and compared with the typical offset paper coatings, based on the kaolinite pigment.