Estudo da lixiviação ácida de catalisador de craqueamento catalítico desativado para remoção de lantânio / Evaluation of electrochemical extraction of metals in deactivated catalytic cracking catalyst

Este estudo avaliou a lixiviação ácida convencional e lixiviações ácidas associadas a peróxido de hidrogênio e micro-ondas, visando maior recuperação de lantânio de catalisador desativado utilizado em craqueamento catalítico fluidizado de petróleo. Os resultados indicaram que a utilização de micro-ondas promoveu uma recuperação de lantânio 74,8% superior quando comparada à lixiviação ácida simples, e 41,3% superior à lixiviação associada ao peróxido de hidrogênio

Equivalence between hot tensile and creep testing data for Kanthal A1 alloy

Hot tensile and creep tests were carried out on Kanthal A1 alloy in the temperature range from 600 to 800 degrees C. Each of these sets of data were analyzed separately according to their own methodologies, but an attempt was made to find a correlation between them. A new criterion proposed for converting hot tensile data to creep data, makes possible the analysis of the two kinds of results according to usual creep relations like: Norton, Monkman-Grant, Larson-Miller and others. The remarkable compatibility verified between both sets of data by this procedure strongly suggests that hot tensile data can be converted to creep data and vice-versa for Kanthal A1 alloy, as verified previously for other metallic materials