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Doctoral Thesis
DOI
10.11606/T.3.2006.tde-16092010-111529
Document
Author
Full name
Míriam Antonio de Abreu
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Toffoli, Samuel Márcio (President)
Büchler, Pedro Maurício
Castanho, Sonia Regina Homem de Mello
Dweck, Jo
Tenório, Jorge Alberto Soares
Title in Portuguese
Reciclagem do resíduo de cromo da indústria do curtume como pigmentos cerâmicos.
Keywords in Portuguese
Cerâmica
Curtume
Pigmentos cerâmicos
Resíduo de cromo
Tratamento de resíduos
Abstract in Portuguese
Este trabalho apresenta uma alternativa para a reciclagem dos resíduos de cromo da Indústria do Curtume incorporando-os na formulação de pigmentos cerâmicos. Inicialmente o resíduo de cromo foi tratado sendo realizada a extração de sais solúveis, cloretos, sulfatos, carbonatos e posterior calcinação para a eliminação de matéria-orgânica, tornando assim, viável sua utilização como pigmentos. Os ensaios realizados utilizaram as seguintes técnicas: fluorescência de raios X, espectroscopia por emissão de plasma atômico, espectrofotometria com difenilcarbazida, análises termodiferencial e termogravimétrica, difração de raios X, eletroforese capilar e microscopia eletrônica de varredura. Através destas análises foram feitos estudos das composições de pigmentos que favoreçam a incorporação do cromo a vidrados cerâmicos. A incorporação foi avaliada por testes de lixiviação ácida e identificação por eletroforese capilar e absorção atômica, confirmando teores abaixo dos limites especificados pela norma NBR10004. Foi possível incorporar até 10% do resíduo de cromo na produção de vidrados cerâmicos, resultando em boas características de cor e textura no vidrado final, mostrando o grande potencial de reciclagem dos resíduos de cromo da indústria do curtume como pigmentos cerâmicos.
Title in English
Recycling of chromium waste of leather industry as ceramic pigments.
Keywords in English
Ceramic pigments
Chromium waste
Leather
Waste treatment
Abstract in English
In this work, an alternative for recycling the chromium waste from the leather industry, incorporating it to formulations of ceramic pigments was studied. Firstly, the characterization of chromium waste was performed, as well as the extraction of soluble salts, chlorides, sulfates, ad carbonates. After that, the calcination, for the elimination of the organic matter to turn viable the use of the waste as ceramic pigments was performed. The various stages were evaluated by: X-ray Fluorescence, Inductively Coupled Plasma-Atomic Emission Spectrometer, Atomic Absorption, Spectroscopy with Dyphenylcarbazide, Differential Thermal Analysis and Thermogravimetry, X-ray Diffraction, Capillary Electrophoresis and Scanning Electron Microscopy. The results indicated that it is possible the incorporation of the waste into the ceramic glazes. Leaching tests were performed with the developed glazes and the chemical compositions of the leachates were determined by capillary electrophoresis and atomic absorption, confirming amounts lower than the ones specified by the Brazilian standard NBR10004. It was possible to incorporate 10wt.% of chromium residue in the production of inorganic pigments, resulting in glazes with good characteristics of color and texture, showing the great potential of recycling chromium waste from the tannery industry in the fabrication of pigments for the Ceramic Tile Industry.
 
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Tese_Miriam_Abreu.pdf (2.37 Mbytes)
Publishing Date
2010-09-27
 
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