Recycling of solid wastes in the synthesis of Co-bearing calcium hexaluminate pigment

Hajjaji, W.; Seabra, M.P.; Labrincha, J.A.

doi:10.1016/j.dyepig.2009.06.004

Cited by 11 publications

(13 citation statements)

References 16 publications

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“…There are a lot of reports about CA 6 up to now. Most reported CA 6 is flake with thickness ranged from 100 to 500 nm and relatively low density . Li et al synthesized flake CA 6 at 1450°C for 3 h using aluminum hydroxide hot treated at 200°C in water as the alumina source; when the synthesized temperature increased to 1500°C, the flake thickness hardly changed.…”

Section: Introductionmentioning

confidence: 99%

“…Most reported CA 6 is flake with thickness ranged from 100 to 500 nm and relatively low density. 20,21,25,26 Li et al 27 synthesized flake CA 6 at 1450°C for 3 hours using aluminum hydroxide hot treated at 200°C in water as the alumina source; when the synthesized temperature increased to 1500°C, the flake thickness hardly changed. Li et al 21 obtained CA 6 with density of 2.5 g/cm 3 and porosity of 35% at 1650°C under 200 MPa using lightweight calcium carbonate and active alumina as raw materials, which still lags behind the requirement of some special applications.…”

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confidence: 99%

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Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉

Chen

et al. 2016

J. Am. Ceram. Soc.

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The effect of Ba2+ on the crystallization thickness of calcium hexaaluminate (CA6) along the c axis was studied. The results show that after introduction of Ba2+, the CA6 flake crystals fired at 1600°C become thicker obviously. The structure refinement shows that the structure formula of the doped CA6 is (Ca0.973Ba0.027)O·6Al2O3, indicating Ba2+ has entered the lattices of CA6 and substituted Ca2+ in the mirror layers. The introduction of Ba2+ results in more defects VAl in spinel block layers in CA6, making ions easier to diffuse along c axis and fastening the growing of CA6 crystals along c axis. Thus, the introduction of Ba2+ is feasible and advantageous to increase the crystallization thickness of CA6 along c axis.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉

Chen

et al. 2016

J. Am. Ceram. Soc.

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“…In some cases neutron Rietveld refinement was performed [2,3,19,20,22,44,56]. Chemical composition and surface topography of natural and prepared hibonite-type single crystals were obtained by scanning electron microscope method (SEM) [14,25,32,33,37,39,41,44,51,53,55]. Elemental distribution was studied by electron microprobe analysis (EMP) [3][4][5]41].…”

Section: Techniques Applied For Hibonitesmentioning

confidence: 99%

“…There have been several reports on turquoise pigments with Ni 2+ as a chromophore in tetrahedral coordination of CaAl 12 O 19 [50][51][52]. Blue hibonite compounds based on tetrahedrally coordinated Co 2+ have also been investigated [53], and Co-and Nicontaining solid wastes were proposed to be used as raw materials for pigment preparation [54,55]. We have discovered a series of hibonite-type pigments with intense royal blue colors [56] as well as many hibonite compositions with a variety of colors other than blue [57].…”

Section: Introductionmentioning

confidence: 99%

Colored oxides with hibonite structure II: Structural and optical properties of CaAl12O19-type pigments with chromophores based on Fe, Mn, Cr and Cu

Medina

Subramanian

2017

Progress in Solid State Chemistry

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Colored hibonite-type oxides with a general formula CaAl 12-x M x O 19 were prepared by solid state reactions through M-site substitution of aluminum with various di-, tri-and tetravalent cations (M = Fe, Mn, Cr, Cu, Ga, In, Ti, Ge, Sn or any combination thereof), where Fe, Mn, Cr and Cu are chromophore ions. Neutron Rietveld refinements of CaAl 9.5 Fe 2.5 O 19 , CaAl 11.5 Mn 0.5 O 19 and CaAl 10 SnMnO 19 compounds show that Fe 3+ and Mn 2+ prefer to occupy the tetrahedral site, while Mn 3+ has an evident preference for both tetrahedral and octahedral sites and Sn 4+ for octahedral site in the hibonite structure. No oxygen vacancies are found by structural analyses, and magnetic measurement confirms divalent Mn for CaAl 11 Sn 0.5 Mn 0.5 O 19 and trivalent Mn for CaAl 11.5 Mn 0.5 O 19. Diffuse reflectance spectra reveal that the d-d transitions occurring in transition metal chromophores are mainly responsible for the observed colors. The colored powders exhibit fairly high reflectance in the near-infrared region (7502500 nm) which makes them potential candidates for cool pigment applications. Synthesis and characterization methods are briefly reviewed for hibonite type of oxides, especially those containing Fe, Mn, Cr and Cu.

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“…Já foi comprovado que a utilização de diferentes resíduos, como ADF precursora de SiO 2 e lama de galvanização para incorporação do cromóforo, permitiu a obtenção de olivina (Ni 2 SiO 4 ) a partir de 1050 ºC [48]. A presença de impurezas nos resíduos pode atuar como mineralizadores ou fundentes, facilitando a síntese do pigmento [23,49]. Neste trabalho foi utilizada sílica comercial e ADF como precursores de SiO 2 para realizar a síntese do pigmento Z n2-x Ni x SiO 4 , sendo x a proporção molar dos elementos zinco e níquel (x=0, 0,5, 1,0, 1,5 e 2,0 mol).…”

Section: Introductionunclassified

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

2019

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Resumo Sintetizaram-se pigmentos do sistema Zn2-xNixSiO4 variando a proporção molar de zinco e níquel, partindo da estrutura willemita (Zn2SiO4) à olivina (Ni2SiO4), usando areia descartada de fundição (ADF) e sílica comercial como fontes de SiO2. A ADF foi caracterizada por análise química e DRX. A síntese dos pigmentos seguiu rota cerâmica, com x = 0, 0,5, 1, 1,5 e 2,0 mol e calcinação a 1200 °C. Os pigmentos foram caracterizados mediante DRX e medidas colorimétricas. Os resultados mostraram que, apesar da presença de alumina e ferro na ADF, as fases cristalinas e cor dos pigmentos foram similares para ambas as fontes de sílica. Teores menores de níquel favoreceram a formação de willemita e maiores a de olivina. Todos os pigmentos (com e sem ADF) dispersos em dois esmaltes e queimados em forno semi-industrial desenvolveram coloração marrom, indicando instabilidade destes nas matrizes usadas, mas confirmando a viabilidade de substituição da sílica comercial por ADF.

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Recycling of solid wastes in the synthesis of Co-bearing calcium hexaluminate pigment

Cited by 11 publications

References 16 publications

Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉

Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉

Colored oxides with hibonite structure II: Structural and optical properties of CaAl12O19-type pigments with chromophores based on Fe, Mn, Cr and Cu

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

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Recycling of solid wastes in the synthesis of Co-bearing calcium hexaluminate pigment

Cited by 11 publications

References 16 publications

Substitution of Ba for Ca in the Structure of CaAl12O19

Substitution of Ba for Ca in the Structure of CaAl12O19

Colored oxides with hibonite structure II: Structural and optical properties of CaAl12O19-type pigments with chromophores based on Fe, Mn, Cr and Cu

Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica

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Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉

Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉