Based on geological, mineralogical, physical, chemical and technological
investigations in the Tamnava Tertiary Basin near Sabac town (western
Serbia), deposits of ceramic clays were studied. These ceramic clays are
composed of kaolin-illite with a variable content of quartz, feldspars,
mica, iron oxides and hydroxides, and organic matter. Four main types of
commercial clays were identified: i) red-yellow sandy-gravely (brick clays);
ii) grey-white poor sandy (ceramic clays); iii) dark-carbonaceous (ceramic
clays); and iv) lamellar (?interspersed?) fatty, poor sandy (highly
aluminous and ferrous clays). Ceramic clays are defined as medium to high
plastic with different ranges of sintering temperatures, which makes them
suitable for the production of various kinds of materials in the ceramic
industry. [Projekat Ministarstva nauke Republike Srbije, br. OI-176016]
Silver fine powder with different shapes and sizes were prepared by chemical reduction and characterized by scanning electron microscope. In this paper was presented the method for the preparation of the fine Ag powder with particles size smaller than 2.5 µm with suitability for the mass-production scale. Reduction was performed from nitrate solution directly by vigorous stirring at room temperature by three different reduction agents, with and without presence of two dispersants. Scanning electron microscopy revealed the preferred size of the particles obtained in all experiments with aim of the protecting agent. Larger particles and wider size distribution were obtained without surfactants although with average size of about 1 µm and small quantity of larger clusters of primary particles that is out of the fine powder classification. High purity, 99.999%, of silver was obtained in every experiment.
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