Development of refractory ceramics from residual silica derived from rice husk ash

Sobrosa, F.Z.; Stochero, Naiane Paiva; Marangon, Ederli; Tier, Marco Antônio Durlo

doi:10.1016/j.ceramint.2017.02.147

Cited by 51 publications

(25 citation statements)

References 17 publications

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“…RHA containing silica is amorphous, however, which causes it to act as a nonheat conducting ingredient in refractories [53]. RHA insulation refractories are fabricated by mixing of different flux contents (as binder), plasticizers (due to the lack of plasticity of RHA) and pore-forming agents (to increase the porosity of final products) [23,35,54]. Air is entrapped in the pores of refractories, a characteristic which is attributed to lower values of κ, because entrapped air acts as a barrier to the flow of heat.…”

Section: Refractoriesmentioning

confidence: 99%

Rice husk/rice husk ash as an alternative source of silica in ceramics: A review

Hossain

Mathur

Roy

2018

Journal of Asian Ceramic Societies

266

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Use of waste or by-products from different industries and the agricultural sector has received increasing attention in the scientific, technology, ecological, economic and social spheres in recent years. Rice husk (RH) is a by-product of rice milling and rice husk ash (RHA) is generated by combustion in a separate boiler. Both RH and RHA are abundantly accessible in rice growing countries such as China, India, Brazil, the USA, and Southeast Asia. RH has therefore been recycled by burning it for energy production. This generates RHA, which contains a huge quantity (85-95%) of amorphous silica. Over the past two decades, RHA has been used extensively in numerous fields for manufacturing of different silicates, zeolites, catalysts, nanocomposite, cement, lightweight construction materials, insulators, and adsorbents. This paper presents a comprehensive overview on the processing of nano-silica from RH/RHA. It tries at the same time, to present a critical review of the application of RHA as an ingredient for the production of various ceramic materials, e.g. refractory, glass, whiteware, oxide and non-oxide ceramics, silica aerogel and SiO 2 /C composites. In summary, amorphous silica derived from RHA or RH provides a potential alternative to conventional silica sources (e.g. quartz) for the manufacture of value-added ceramics for practical applications.

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Section: Refractoriesmentioning

confidence: 99%

Rice husk/rice husk ash as an alternative source of silica in ceramics: A review

Hossain

Mathur

Roy

2018

Journal of Asian Ceramic Societies

266

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“…It can be observed that samples A, AS10 and AS10W5 presented zigzag fractures, which is more visible in formulation A. This mode of fracture indicates that there was a higher total fracture energy since the cracks went through a longer path in the material [33]. The other formulations presented flat fracture surfaces.…”

Section: Thermal Shockmentioning

confidence: 90%

Effects of rice husk ash and wollastonite incorporation on the physical and thermal properties of refractory ceramic composites

Silva

Pachla²,

Marangon

et al. 2020

Matéria (Rio J.)

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The main objective of this work was to evaluate the effects of rice husk ash and wollastonite microfibers incorporation, added per clay partial substituition, on physical and thermal properties of refractory ceramic composites. The raw materials characterization occurred with respect to their chemical composition (XRF), phase composition (XRD) and granulometry by laser. The composites were avaluated by physical properties - apparent porosity, bulk density, water absorption, linear retraction after sinterization and mass variation - and thermal properties - thermal conductivity and thermal shock. The rice husk ash used in the present work proved to have potential as a ceramic precursor in the development of refractories. The clay substitution per ash and the microfiber different percentages resulted in an increase in water absorption and apparent porosity and a reduction in the linear retraction. The increase in porosity suggests that the mullitization was insufficient. Regarding the thermal performance, the thermal conductivity was inversely proportional to the porosity and the microfiber percentage. In addition, the higher the thermal-shock temperature gradient the lower was the number of cycles resisted by the composites.

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“…The high silica content in the rice husk ash has attracted interest in discovering ways to use it commercially [17]. Rice husk burning generates new waste, namely rice husk ash (RHA), which corresponds to 20% of husk volume [19]. The silica, namely rice husk silica (RHS), generated from rice husk ash has proved can enhance the strength of ceramic by creating amorphous structure [20].…”

Section: Introductionmentioning

confidence: 99%

“…This research intended to determine the strength exhibits by the combination of RHA and bentonite clays, in which, there were very least study to show the utilising of RHA as the only filler for mould making the material. Although, recent researchers have shown the development of rice husk for ceramic refractories and encouraging work have been done to extract the silica from the rice husk [17], [19]. It is found most of the studies, brought an approach to integrating rice husk and rice husk ash (RHA), as an additive to enhance shell mould properties; permeability and strength (MOR).…”

Section: Introductionmentioning

confidence: 99%

Shell Mould Strength of Rice Husk Ash (RHA) and Bentonite Clays in Investment Casting

Nanda

Ali

Idris

et al. 2018

International Journal on Advanced Science, Engineering and Information Technology

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Investment casting process (IC) plays a major role in the modern manufacturing process in providing an economical means of mass production components with intricate shape and complex geometry as demand in various crucial applications including aerospace, automotive, military, biomedical and others. This casting technique, develop shell mould fabrication by coating the required pattern with a refractory mixture which offers the complex geometrical shape and sizes parts to be cast. However, the modern IC approach in shell mould production suffers from zircon's cost and supply instability as it is the main material to be used. Zircon uses as refractory filler for slurry production, and also in the form of sand used as stucco particles, is favoured by the investment casting facilities and industries as it exhibits the most versatile properties such as low thermal expansion and low reactivity to the metal to be cast. During the period of zircon supply shortage, many facilities introduce several alternatives. Currently, the step taken to reduce the cost of primary slurry material is by using some alternate refractory material like, alumina, silica, to be used with zircon for shell mould production. In relation to that, several researches continue to search for alternatives approach for shell mould materials. This research introduces the alternative method in fabricating investment casting shell mould as recognized from investment casting industry located in Sungai Puar of Bukittingi Padang Indonesia. This industry employs several local resources to fabricate the shell mould. These materials consist of rice husk ash (RHA), and two types of bentonite clays. The bentonite clays were obtained nearly from Kota Payakumbuh in the western provinces. However, this industry suffers from weak shell mould strength and need to be investigated and consulted. In this paper, the investigation on shell mould strength made from rice husk ash (RHA), and bentonite clays were conducted. The strength was measured by its modulus of rupture (MOR) performed in 3 points flexural bending test. The green and fired shell mould strength was determined from five type of slurry composition. The results revealed that the highest green and fired strength obtained were 0.157 MPa and 0.361 MPa from shell mould sample C of RHA (46%) and bentonite (54%) of its composition.

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Development of refractory ceramics from residual silica derived from rice husk ash

Cited by 51 publications

References 17 publications

Rice husk/rice husk ash as an alternative source of silica in ceramics: A review

Rice husk/rice husk ash as an alternative source of silica in ceramics: A review

Effects of rice husk ash and wollastonite incorporation on the physical and thermal properties of refractory ceramic composites

Shell Mould Strength of Rice Husk Ash (RHA) and Bentonite Clays in Investment Casting

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