Processing of red ceramic using a fast-firing cycle

Abstract

This work reports on the processing of red ceramic for civil construction using fast-firing cycles. The firing cycle is an important variable in the processing of red ceramic materials, which contributes to a high consumption of energy. The red ceramic pieces were prepared by industrial extrusion and fired at firing temperatures varying from 700 ºC to 1100 ºC using different firing cycles (slow-firing cycle -1º C/min and fast-firing cycle -10 ºC/min and 20 °C/min). The technological properties (linear shrinkage, water absorption, apparent porosity, apparent density, and flexural strength) as function of the firing temperature and firing cycle are investigated. The development of the microstructure was followed by SEM/SEI. The results showed that fast-firing red ceramics exhibits technological properties and microstructure comparable to conventionally fired red ceramics, resulting in great advantages in energy saving. Keywords: red ceramic, fast-firing, firing cycle, processing, properties. Resumo Este trabalho descreve o processamento de cerâmica vermelha para construção civil usando ciclos de queima rápido. O ciclo de queima é uma variável importante no processamento de materiais de cerâmica vermelha, o qual contribui para um alto consumo de energia. As peças de cerâmica vermelha foram preparadas por extrusão industrial e queimadas nas temperaturas de queima

Effect of the ceramic membrane properties on the microbial fuel cell power output and catholyte generation

“…This value can indeed be modified by slightly changing the raw materials composition, as well as the firing process. Slow-firing cycles, which can reach up to 60 h, are typically used for manufacturing ceramics worldwide [9,36]. The water absorption and porosity have been reported to be higher in the fast-fired clays, while lower linear shrinkage and flexural strength were obtained after low-fired clays [26].…”

“…Therefore, by modifying the structural parameters and the magnitude of firing cycles, the quality of the ceramic material can be adjusted [22]. However, it has also been reported that the water absorption in red clay decreases with increasing firing temperature, independently of the firing cycle [36]. Thus, it will be a combination of the speed firing cycle and the firing temperature that will affect the water absorption of ceramic membranes.…”

Modes of tetra(4-pyridyl)porphyrinatomanganese(III) ion intercalation inside natural clays

“…Comparison of the XRD patterns in the Figure with earlier reports [ 38 ] shows that the Naked Clay contains Kaolinite (with 2θ = 12.65°, 25.48°, 40.36° and 55°). Signals for quartz appear (at 2θ 20.70°, 26.69°, 50.26° and 60.11°).…”

Produção mais limpa: contributos teórico-práticos para a sustentabilidade da cerâmica vermelha

“…Boas práticas operacionais (BPO): em [52] comprovouse que o processamento de cerâmica vermelha em ciclos de queima rápida (10 e 20 ºC/min) entre 700 e 1100 ºC resulta, para telhas e blocos cerâmicos, propriedades tecnológicas e microestrutura comparáveis àquelas convencionalmente obtidas via queima lenta (1 ºC/min). O ciclo de queima rápida pode ser viável nos âmbitos econômico e técnico, além de trazer benefícios ambientais como a economia de combustível e de energia [52].…”

“…O ciclo de queima rápida pode ser viável nos âmbitos econômico e técnico, além de trazer benefícios ambientais como a economia de combustível e de energia [52]. Por conseguinte, entende-se que tal técnica é uma BPO, uma vez que consiste em trazer mudança operacional no processo de queima para reduzir desperdícios de combustível e de energia.…”