Development of refractory ceramics from residual silica derived from rice husk ash and steel fibres

Stochero, Naiane Paiva; Marangon, Ederli; Nunes, Angela Santana; Tier, Marco Antônio Durlo

doi:10.1016/j.ceramint.2017.07.111

Cited by 17 publications

(10 citation statements)

References 22 publications

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“…Numerous researchers are trying to introduce this waste for manufacturing refractory. Sobrosa et al 16 and Stochero et al 17 have synthesized refractory material by replacing kaolin clay with RHA silica. The results are observed to improve mechanical strength by reducing porosity up to 20% of RHA addition.…”

Section: Introductionmentioning

confidence: 99%

A replacement of traditional insulation refractory brick by a waste‐derived lightweight refractory castable

Hossain

Bae

Roy

2021

Int J Applied Ceramic Tech

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Lightweight insulation refractories are essential for high‐temperature performance to reduce energy consumption. This study investigates a new insulation material, that is, solid waste rice husk ash (RHA) derived lightweight refractory castable, replacing traditional insulation refractory brick. The RHA is generated after the burning of rice husk as biomass fuel. The RHA is used as an aggregate and alkali‐extracted silica sol from RHA as a binder to fabricate the insulation castable. The nanosilica containing (~30 wt%) sol is employed to synthesize the refractory castable by varying the sol amount (2.5‐12.5 wt% silica from sol). The castable specimens are cast by a vibro‐caster and fired at 900‐1200°C in a muffle furnace. The physic‐mechanical and thermal conductivity (κ) of the castable is investigated. At 1100°C with 10 wt% dry sol retaining sample shows an excellent apparent porosity (~65%), low bulk density (~ 0.8 g/cm3), and κ (0.136 W/m k) with sustainable compressive strength (6 MPa). The acquired results are a good match with the literature (other wastes‐derived insulation materials) and industrial (silica insulation brick) obtained data. These promising outcomes may inspire the refractory industries for using RHA as an aggregate and RHA extracted sol as a binder for making insulation castable.

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Section: Introductionmentioning

confidence: 99%

A replacement of traditional insulation refractory brick by a waste‐derived lightweight refractory castable

Hossain

Bae

Roy

2021

Int J Applied Ceramic Tech

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“…Silica is the main forming oxide present in a bioglass and, generally, it is obtained through alkoxysilane precursors, like tetraethylorthosilicate (TEOS), that are expensive [5]. The rice husk is a low-cost alternative source for obtaining amorphous silica, with levels greater than 90% [9]. About 23% of the total weight of the rice corresponds to the husk and it can accumulate up to 15% of silica that is stored mainly in the husk ash [9,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of the use of rice husk as source of silica on the sol-gel synthesis of bioglass

2021

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Among the agro-industrial residues, the rice husk has stood out for presenting contents higher than 90% of silica, the main oxide of bioglass. Thus, the objective of this research was to compare the use of two different sources of silica, tetraethylorthosilicate (TEOS) and rice husk ash (RHA), in the sol-gel synthesis of the bioglass of the SiO 2 -CaO-Na 2 O system. For the silica extraction, the rice husk was treated with oxalic acid and calcined at 600 °C. This temperature was determined using thermogravimetry and the calcined powder was analyzed by X-ray diffraction and X-ray fluorescence spectroscopy, proving the achievement of highpurity amorphous silica. In the production of the bioglass, the solution made with the rice husk showed great synthesis efficiency, and the powder calcined was evaluated by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and scanning electron microscopy. FTIR spectra presented characteristic bands of siloxane (Si-O-Si) bonds, which indicated a vitreous network and provided the formation of silanol groups, fundamentals for the growth of the hydroxyapatite layer. The microstructures of the samples were similar, but the sample made from RHA (BRHA) presented porous agglomerates, while the BTEOS had smaller and well-defined particles. The silica obtained from rice husk showed potential to be used in the sol-gel synthesis of bioglass.

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“…O aumento populacional e o consequente crescimento das atividades industriais acarretam em danos à natureza, especialmente devido ao esgotamento de recursos naturais e à geração de resíduos [1,2]. Assim, a exploração dos recursos e a problemática relativa ao descarte de resíduos acentuam a necessidade de recuperação destes materiais [3].…”

Section: Introductionunclassified

“…Este valor também pode ser utilizado como indicativo qualitativo da estabilidade e durabilidade do pigmento [34,[37][38][39]. ΔE* ab = ΔL 2 + Δa 2 + Δb 2 (A)…”

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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Development of refractory ceramics from residual silica derived from rice husk ash and steel fibres

Cited by 17 publications

References 22 publications

A replacement of traditional insulation refractory brick by a waste‐derived lightweight refractory castable

A replacement of traditional insulation refractory brick by a waste‐derived lightweight refractory castable

Influence of the use of rice husk as source of silica on the sol-gel synthesis of bioglass

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

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