Alternative technological approach for synthesis of ceramic pigments by waste materials recycling

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• 作者：Mihail Doynov^a ; Tsvetan Dimitrov^b ; Stephan Kozhukharov^c ; ^{stephko1980@abv.bg" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Chromspinelides ; Ceramic pigments ; Industrial wastes
• 刊名：Boletín de la Sociedad Espa?ola de Cerámica y Vidrio
• 出版年：2016
• 出版时间：March-April 2016
• 年：2016
• 卷：55
• 期：2
• 页码：63-70
• 全文大小：1627 K

文摘

Alternative technological approach is proposed enabling utilization of raw materials from an oil refinery, such as waste guard layers from reactors. Reagent grade and purified MgO, Cr₂O₃, Fe₂O₃, and nitric acid (HNO₃), were used as additional precursors. The homogeneous mixtures obtained were formed into pellets and sintered at different temperatures. The main phase was proved by X-ray phase analysis (XRD) and compared to ICPDS database. The main phase in the ceramics synthesized was solid solution of spinel MgAl₂O₄ and magnesiochromite. These minerals are classified as chromspinelide MgCr_1.2Al_0.4Fe_0.4O₄ and alumochromite MgCr_1.6Al_0.4O₄. Additional SEM observations, combined with EDX analysis were performed, evincing agglomeration at lower temperatures, followed by agglomerate crumbling, at elevated calcination temperature.

The complete transformation of initial precursors into the final ceramic compounds was found to occur at 800 °C – 1 h. The ceramic samples synthesized had high density of 1.72–1.93 g/cm³ and large absorption area – 32.93% which is probably due to the high porosity of the sample.