The charcoal production from wood wastes is a viable and suitable alternative to income Amazon region. However, it is necessary to define the best parameters for the optimization of production. The aim was to study the effect of three final temperatures (300, 400 and 500ºC) in physical, mechanical and energetic properties of wood waste charcoal of Tachigali chrysophylla. The material was collected in an area under second cutting cycle forest management in the Amazon. Branch waste of three trees were cut in 20x20x40mm³ samples and carbonized at different final temperatures at 1.6°C.min -1 . The apparent density, mechanical strength and modulus of elasticity at parallel compression, gravimetric yield on charcoal and the higher heating value were determined. The data were analyzed with p<0.05.The final temperature affected the evaluated charcoal properties . The temperature of 500ºC is indicated when a charcoal with high mechanical strength at parallel compression and higher Palavras-chave: Resíduos amazônicos, Carvão vegetal, Poder Calorífico Superior.
Thermal modification mechanisms and their effects on physical and mechanical properties of native Amazon hardwoods are not yet completely understood. It is expected that such treatments can improve the properties of low-value Amazonian woods and sapwood residues. This study aimed to investigate the impact of heat treatment on the swelling and mechanical properties (strength and stiffness to Static Bending and Janka hardness) of tauari wood (Couratari spp.), a low-value Amazonian hardwood. For this, tauari wood samples were thermally modified in an electric oven under hot air irradiation at final temperatures of 160 °C, 170 °C, 180 °C, 190 °C, 200 °C, and 210 °C for 2.5 h. The main results showed that thermal modification increased the hydrophobicity of tauari wood without any noticeable effects on the mechanical behavior of the wood up to 200 °C. It was stated that up to 200 °C thermal modification is beneficial in terms of gains in hydrophobicity. In contrast, above 200 °C, despite an increase in hydrophobicity, consistent decreases in strength (MOR) and hardness were observed.
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