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2 Polish Journal of Chemical Technology

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Precipitation methods of coloured silicates and oxides - highly dispersed pigments

Klapiszewska B., Krysztafkiewicz A., Jesionowski T.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 4

106-108

Studies were performed on the production of highly dispersed green pigments, chromium(III) and nickel(II) silicates and oxides in emulsion systems. Appropriately selected parameters in which the process was conducted permitted to obtain pigments of optimum utility properties. The obtained pigments were subjected to a physicochemical analysis, i.a., their principal physicochemical properties were established, the including particle size, particle size distribution and the morphology of the particle surface.

Application of reduced chromate solutions for precipitation of silicate pigments

Klapiszewska B., Krysztafkiewicz A., Jesionowski T.

Polish Journal of Chemical Technology

2003

Vol. 5, nr 4

31-33

New method was worked out for utilisation of postgalvanic refuse containing chromates(VI) Chromates contained in the refuse solution were reduced to chromium(III) compounds using hydrogen peroxide or hydrazine. The obtained chromium(III) hydroxide was subsequently passed to a solution using sulphuric acid. The studies pertained production of pigments, chromium(III) silicates obtained by precipitation from solutions of chromium metasilicate and chromium sulphate. The obtained pigments were analysed using, modern investigative techniques: SEM technique in studies on morphology and DLS technique in studies on particle size and particle tendency to form agglomerate structure.