Experimental study and modelling of isotherms of sorption of humid naturalphosphate

Morocco has the most important deposits of phosphate in the world. The pres ent paper aims to determine experimentally the isotherms of sorption of hum id natural phosphate using the saturated salt method. The experiments are c onducted at five temperatures which are: T = 30 degreesC, 40 degreesC, 50 d egreesC, 60 degreesC and 70 degreesC, The experimental curves of sorption a re then described by Henderson's, Guggenheim, Anderson, and Beer's and Brun auer, Emmet and Teller's models, The isotherms of sorption calculated by th e three models are compared. (C) 2000 Elsevier Science Ltd. All rights rese rved.