A review on the production of porous ceramics using organic and inorganic industrial waste

Silva, Karina Ruiz; Menezes, Romualdo Rodrigues; Campos, L. F. A.; Santana, Lisiane Navarro de Lima

doi:10.1590/0366-69132022683873309

Cited by 4 publications

(2 citation statements)

References 102 publications

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“…Low thermal conductivity due to increased porosity was achieved by addition of organic waste in ceramics. [19] Three traditional charcoal cook stoves tested by Boafo showed that the cook stove insulated with a ceramic liner performed better in terms of thermal efficiency. [20] Material analysis by Schreiner showed that use of straw in clay mixture improves thermal efficiency.…”

Section: Improving Thermal Efficiency Using Organic Wastementioning

confidence: 99%

Improvement of Ceramic Insulation of Cook Stoves Using Carbonized Organic Waste

Kyuvi,

Nyangaya,

Aganda

2023

JENRR

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Many households and small hotels in Kenya source their energy from biomass; mainly wood and charcoal. For the urban poor, their energy source is basically charcoal. With increasing population, rural urban migration, tough economic times, the use of charcoal must be as efficient as possible. In cognizance of this need, development of energy efficient biomass (charcoal) cook stoves is paramount. The main objective of the project was to optimize the insulating properties of ceramic insulation used in ceramic cook stoves using carbonized organic waste as the burnout additive. Carbonized organic waste herein referred to as char was collected and ground to fine dust. The char was used as a burnout medium in the clay to create pores, reduce density and increase porosity thereby improving insulation properties of the fired clay. Optimization was achieved by using different ratios of clay to char. Testing of biomass cook stove is provided for in ISO- 19867-0; the harmonized laboratory test protocol. The results showed that the apparent porosity of the sample increased from 34% with no char to 87% when the sample had 50% char. On the other hand, the bulk density reduced from 2.8 g/cm3 with no char to 1.2 g/m3 with 50% char. The prototype thermal efficiency was 33% and 25.8% for the control cook stove. The prototype and control cook stove cooking power were 0.97kW and 0.71kW respectively. The prototype PM2.5 emissions estimated to be 76 mg/MJd and CO emissions at 21 g/MJd which were lower than the Kenya standard KS 1814:2019 maximum emission of 137 mg/MJd and 25 g/MJd respectively This study has shown that when clay was mixed with char, there was a significant increase in desirable characteristics, which results in increased efficiency of biomass (charcoal) cook stoves and lower emissions.

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Section: Improving Thermal Efficiency Using Organic Wastementioning

confidence: 99%

Improvement of Ceramic Insulation of Cook Stoves Using Carbonized Organic Waste

Kyuvi,

Nyangaya,

Aganda

2023

JENRR

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“…Em contrapartida, materiais cerâmicos porosos apresentam vantagens, como elevado ponto de fusão e resistência à corrosão e ao desgaste. Crescentes avanços na tecnologia de processamento de materiais cerâmicos associados à demanda por materiais porosos se destacaram por suas amplas possibilidades de uso em vários campos da engenharia, desde tratamento de água até isolamento térmico e acústico e suporte catalítico (SILVA et al, 2022).…”

Section: Conformação De Materiais Cerâmicos Porososunclassified

Influência dos parâmetros da sinterização >i<flash>/i< na densificação e microestrutura do ZnO

Storion

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STORION, A. G. Influence of the Flash Sintering parameters on the densification and microstructure of ZnO. 2023. 170 pp. Thesis (Doctorate) -University of São Paulo. Graduate Program in Materials Engineering and Science, Pirassununga, 2023.Alternative techniques to conventional sintering have been studied for controlling microstructure and grain growth, besides lower energy consumption. Among such techniques flash sintering stands out, providing fast shrinkage and densification in seconds. It applies to several materials, such as ZnO, an n-type semiconductor used in many electronic and optoelectronic devices. Despite numerous advances, flash sintering still faces some scientific challenges to overcome for its viability in industrial applications. To contribute to the advances in this scientific field, the present work aimed to evaluate the flash sintering parameters on ZnO microstructural homogeneity and application possibilities. During the parameterization step, it was possible to analyze the ideal process conditions, such as electrical and thermal parameters and material preparation. Subsequently, the influence of forming methods and the consequent density gradients formed in ZnO specimens on densification and microstructure when sintered via flash sintering was evaluated for the first time in the literature. The results indicated that the green density distribution generated during forming should be considered a decisive factor when evaluating specimens submitted to flash sintering. Also, flash sintering was investigated when coupled with thermal insulation with an alumina blanket (TIFS). The results showed that TIFS provided a more homogeneous microstructure, reducing the difference in grain size between the core and the surface of the specimen. TIFS, besides providing a 450°C decrease in the flash event onset temperature, was also able to achieve an estimated temperature during stage III only 100°C lower than that achieved for flash sintering under the same conditions, evidencing energy savings of up to 78% with the insulation process, compared to the uninsulated flash sintering experiments. The present work also aimed to evaluate the performance of flash-sintered ZnO when applied as a photocatalyst, since it may present great potential for application in the production of samples with refined microstructure, improving the surface reactivity. It was possible to prepare specimens with high porosity and sufficient integrity to be submitted to flash sintering. The results of the photocatalytic tests of the flash-sintered specimens were promising compared to the conventional-sintered ones, demonstrating the potential application of this alternative sintering route in the processing of photocatalysts.

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Recent developments in processing techniques and morphologies of bulk macroporous ceramics for multifunctional applications

Roy

2024

Materials Today Communications

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A review on the production of porous ceramics using organic and inorganic industrial waste

Cited by 4 publications

References 102 publications

Improvement of Ceramic Insulation of Cook Stoves Using Carbonized Organic Waste

Improvement of Ceramic Insulation of Cook Stoves Using Carbonized Organic Waste

Influência dos parâmetros da sinterização >i<flash>/i< na densificação e microestrutura do ZnO

Recent developments in processing techniques and morphologies of bulk macroporous ceramics for multifunctional applications

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