|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Streams: Recycling and Sustainability Joint Session
||B-11: High Temperature Crystallization Kinetics of MgSO4.H2O
||Kristine Bruce Wanderley, Denise Crocce Romano Espinosa, Jorge Alberto Soares Tenório, Mariana Alves de Carvalho
|On-Site Speaker (Planned)
||Mariana Alves de Carvalho
Magnesium is present in nickels leach liquor and it is often disposed in waste barriers. However, new technologies with the aim of recuperating magnesium and other metals in the liquor have proven that it is possible to reduce the amount of metal lost during nickel ore processing. In this context, high temperature crystallization removes magnesium, with a concentration of 8 g/L, as MgSO4.H2O from the leach liquor. Kinetic studies of this process are needed to evaluate the thermodynamics of the growth of crystals. Thus, this work aims to study the crystallization kinetics of MgSO4.H2O. Temperatures of 230, 210 and 200 °C were investigated in a batch crystallization system. Aliquots were taken at each hour up to 5 hours of time residence and analysed by ion chromatography for magnesium concentration. The reaction mechanism as well as rate constant and activation energy for each reaction temperature were obtained.