Extraction of Magnesia from Egyptian Serpentine Ore via Reaction with Different Acids. II. Reaction with Nitric and Acetic Acids

摘要: The results of a kinetic study the dissolution magnesia from Egyptian serpentine ore with nitric and acetic acids are presented. effects on (a) temperature ranging 30 to 105 °C, (b) time 2.5 min several days, (c) molal ratios between one MgO in 4.42 3.86, From analysis rate basis core model, it was found that could be well expressed by equation based rate-limiting step surface chemical reaction. apparent activation energies were ca. 17.4 8.3 kcal mol−1 for acid respectively. high energy reaction associated relatively higher values entropy (ΔS* = −19.5 cal K−1), whereas low is negative −44.3 ...