STUDY OF THE ADDITION OF LIGNIN EXTRACTED FROM KRAFT BLACK LIQUOR IN THE MECHANICAL PROPRIETIES OF BRIQUETTES/ESTUDO DA ADICAO DA LIGNINA KRAFT NAS PROPRIEDADES MECANICAS DOS BRIQUETES DE RESIDUOS DA INDUSTRIA MOVELEIRA

In order to improve global effectiveness of energy production, a strategy is the model of bio-refineries in which all the components of biomass are totally used to produce a range of products with aggregated value. The kraft lignin is one of the products originated in the process of cellulose production that can be used in making densified products. The objective of this work was to evaluate the behavior of the addition of extracted kraft lignin of black kraft liquor in briquette manufactures with furniture industry waste, in the form of shavings and panel particles in different proportions. The briquettes were produced in laboratory briquetting, using the temperatures of 60, 75 and 90[degrees]C. The pressing and cooling time was 5 minutes and pressure 68,9 x [10.sup.5] N x [m.sup.-2] (1000 PSI). The briquette quality was evaluated through determining the mechanical properties. The kraft lignin in adequate proportions and temperature showed advantages in the increase of resistance and the durability of the briquettes. The kraft lignin presented advantages such as agglutinative in briquette productions from wood waste at a pressing temperature of 90[degrees]C with addition of 20% of kraft lignin, and at pressing temperatures of 60 and 75[degrees]C at a proportion of addition of 40 and 60% of kraft lignin to wood waste, respectively. Keywords: briquetting; agglutinative; furniture industry. A fim de melhorar a eficacia global da producao de energia, uma estrategia e o modelo de biorrefinarias, em que todos os componentes de biomassa sao totalmente utilizados para produzir uma gama de produtos de maior valor agregado. A lignina kraft e um dos produtos oriundos do processo de producao de celulose e que pode ser utilizado na confeccao de materiais densificados. O objetivo deste trabalho foi avaliar o comportamento da adicao da lignina extraida do licor negro kraft em briquetes confeccionados com residuos da industria moveleira na forma de maravalha e particulas de paineis; em diferentes proporcoes. Os briquetes foram produzidos em briquetadeira laboratorial, usando as temperaturas de 60, 75 e 90[degrees]C. O tempo de compactacao e resfriamento foi de 5 minutos e pressao 68,9 x [10.sup.5] N x [m.sup.-2] (1000 PSI). A qualidade dos briquetes foi avaliada em funcao da determinacao da propriedade mecanica. Determinou-se a carga de ruptura dos briquetes. A adicao de lignina kraft aos residuos de madeira nas proporcoes e temperatura adequadas apresentou vantagens de