Effect of Firewood Ash Waste on the Densification Behavior of Electrical Siliceous Porcelain Formulations

Coutinho, Nicolle Cabral; Paes, Herval Ramos; Holanda, José Nilson França de

doi:10.1007/s12633-022-01799-0

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…The DTA-TG curves for the kaolin, coffee grounds waste, and FM4 formulation are shown in Figure 4. The kaolin sample (Figure 4a) corresponding to the FM1 formulation (coffee grounds waste-free formulation) presented the following thermal events with increasing temperature: 1) a small endothermic event between ~ 25 and 400 ºC associated with the release of moisture water accompanied by mass loss of 0.627 %; 2) relevant endothermic event at 555.8 °C related to dehydroxylation of kaolinite for formation of amorphous metakaolinite, accompanied by mass loss of 10.539 %; and 3) exothermic event at 1002.0 ºC without mass loss related to the formation of primary mullite (Santos, 1989;Coutinho et al, 2022). It may also be noted that the total mass loss obtained from the TG curve of 11.17 % was well correlated with the value of LoI of 12.88 % (Table 2).…”

Section: Resultsmentioning

confidence: 99%

Valorization potential of coffee grounds waste as a renewable pore-forming agent to produce low-cost porous ceramic support

Maciel

Areias²,

Holanda³

2023

RSD

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Every day expressive amounts of coffee grounds waste generated during making the coffee beverage are produced worldwide. The aim of this work was to investigate the valorization potential of the coffee grounds waste as an alternative pore-forming agent to produce porous kaolin-based ceramic supports. For this purpose, kaolin-based ceramic support formulations containing up to 40 mass % of coffee grounds waste were pressed and fired at temperatures ranging from 1000 to 1200 ºC. The sintering behavior and technical properties (linear shrinkage, mass loss, apparent density, mechanical strength, and apparent porosity) have been investigated. The microstructural evolution has been accompanied by scanning electron microscopy (SEM) and 3D-confocal microscopy. The obtained results demonstrated that the coffee grounds waste could serve as a very effective pore-forming agent to produce kaolin-based ceramic support with highly porous structures. Such ceramic supports incorporated with coffee grounds waste exhibited values of apparent porosity within the range of 41.87 % to 70.96 %. This results suggests that the coffee grounds waste, in the range of 10 - 40 mass %, could be a highly promising renewable porogenic material to be valorized to produce low-cost kaolin-based ceramic support with good porosity properties. This new approach could be an innovative alternative for the sustainable use of coffee grounds waste.

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Section: Resultsmentioning

confidence: 99%

Valorization potential of coffee grounds waste as a renewable pore-forming agent to produce low-cost porous ceramic support

Maciel

Areias²,

Holanda³

2023

RSD

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Recycling of Firewood Ash Waste in Ceramic Floor Tiles with Low Water Absorption

Gomes

Holanda

2023

Mat. Res.

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Utilization of Ashes from Biomass Combustion

et al. 2022

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Biomass is one of the most important sources of renewable energy in the energy industry. It is assumed that by 2050 the global energy deposit could be covered in 33–50% of biomass combustion. As with conventional fuels, the combustion of biomass produces combustion by-products, such as fly ash. Therefore, along with the growing interest in the use of biomass as a source of energy, the production of ash as a combustion by-product increases every year. It is estimated that approximately 476 million tons of ashes per year can be produced from biomass combustion. For example, the calorific value of dry wood mass tends to be between 18.5 MJ × kg−1 and 19.5 MJ × kg−1, while the ash content resulting from thermal treatment of wood is from 0.4 to 3.9% of dry fuel mass. However, biomass ash is a waste that is particularly difficult to characterize due to the large variability of the chemical composition depending on the biomass and combustion technology. In addition, this waste is, on the one hand, a valuable fertilizer component, as it contains significant amounts of nutrients, e.g., calcium (Ca), potassium (K) and microelements, but on the other hand, it may contain toxic compounds harmful to the environment, including heavy metals and substances formed as a result of combustion, such as polycyclic aromatic hydrocarbons (PAHs) or volatile organic compounds (VOCs). PAHs and VOCs are formed mainly in the processes of incomplete combustion of coal and wood in low-power boilers, with unstable operating conditions. However, it is important to remember that before the fly ash is used in various industries (e.g., zeolite synthesis, recovery of rare earth metals or plastic production) as an additive to building materials or fertilizers for cultivation, a number of analyses are to be conducted so that the by-products of combustion could be used to allow the by-product of combustion to be used. It is important to conduct tests for the content of heavy metals, chlorides, sulphates, microelements and macroelements, grain and phase composition and organic compounds. If such ash is characterized by low pollution levels, it should be used in agriculture and reclamation of degraded land and not directed to landfills where it loses its valuable properties. The purpose of this review is to present the properties of ashes generated as a result of biomass combustion in Poland and the world, to discuss factors influencing changes in its composition and to present the possibilities of their reuse in the environment and in various branches of industry.

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Effect of Firewood Ash Waste on the Densification Behavior of Electrical Siliceous Porcelain Formulations

Cited by 3 publications

References 36 publications

Valorization potential of coffee grounds waste as a renewable pore-forming agent to produce low-cost porous ceramic support

Valorization potential of coffee grounds waste as a renewable pore-forming agent to produce low-cost porous ceramic support

Recycling of Firewood Ash Waste in Ceramic Floor Tiles with Low Water Absorption

Utilization of Ashes from Biomass Combustion

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