Effect of Thermal Treatment on Kaolin Activated by Inorganic Acids (H2SO4 and HCl) - تأثير المعاملة الحرارية على الكاوؤلين المنشط بالاحماض اللاعضوية (حامض الكبريتيك وحامض الهيدروكلوريك)

Abstract

This study is considered as a complementary work to a previous study (Effect of H2SO4, HCl on Physico chemical properties of kaolin clay "Duekhla Site"). In the current study, the calcination was achieved after acid treatment by inorganic acids (sulfuric acid (H2SO4) and Hydrochloric acid HCl). Acid activation was conducted at the conditions of solid / liquid (1/8), temperature of reaction was (100-110 °C), acid concentration (Molarity) (9.5 M) , (11.5 M) and a reaction time of (4 hrs) for (H2SO4 and HCl) , respectively. was carried out at temperature ranging from (350-550 °C) and time intervals ranging from (1 to 2 hrs) at constant rate interval (5 °C/min) , The chemical analysis of the samples were carried out before and after calcification for comparing them and studied the effect of acid and thermal treatment on the impurities associated with the clay oxides (CaO, Na2O, K2O, MgO and TiO2), while (XRD) indicates the collapse of the clay structure. Theoretically, the results showed that the suitable temperature for thermal treatment of kaolin activated by inorganic acids without causing the damage in the structural composition was (350 °C) at (1 hrs) for both acids, but it was not practically be examined to know its efficiency as adsorbent agent.