Synthesis and characterization of hematite pigment, obtained from a waste steel industry / Síntese e caracterização de pigmento de hematita, obtido a partir de um subproduto da indústria siderúrgica

AUTOR(ES)

Sônia Richartz Prim

DATA DE PUBLICAÇÃO

2009

RESUMO

In the ceramic industry of wall and floor tiles, whose selection is strongly influenced by the visual aspect of the decorated surface, the color becomes one of the most important characteristics. With the purpose to search for new pigments that replace or optimize the already known, news method to synthesis are being researched, such as new pigments system and the incorporation of new raw materials. In this work was investigated the possibility of use of a waste industrial rich in iron in the synthesis of encapsulated pigments. It was selected five wastes, four from casting surfacing process and one waste from sheet metal treatment process. The wastes was characterized by chemical composition, cristalline phases present and morphology of the particles. The waste that introduced more percentage of hematite were added to the silica matrix, crystalline and amorphous and then homogenized using conventional milling and high energy followed by calcination at temperatures of 1050 to 1300C for 2 hours. The characterizations of pigments obtained were made through X-ray diffraction and scanning electron microscopy. The pigments were applied in ceramic enamel and porcelain body. Afterwards, it was carried out by colorimetry and scanning electron microscopy. The results showed that the development of color becomes effective when the pigment is incorporated in ceramic body, because it is less aggressive. The color developed is influenced by variables such as the oxide content employed, conditions of milling and processing temperature. The results have showed that the use of developed dont interfere in microstructural characteristics of pigmented material.

ASSUNTO(S)

revestimentos cerâmicos industrial waste iron oxide Óxido de ferro subprodutos industriais ceramica ceramic tilles ceramic pigments pigmentos cerâmicos

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