Low temperature ashing for Z0, Z1 and Z2 Tarfaya (MOROCCO) oil shale layers , followed by acid etching to prevent physical and chemical effects.

An approach to the reactivity of an acid attack on oil shale samples from three layers (Z0, Z1, Z2) of the Tarfaya deposit was the subject of this study. The experimental method used consists of low-temperature ashing (LTA) in order to oxidize the organic matter with as little change as possible in the inorganic phases. In other words, acid etching followed by back-assaying were carried out, with the shale samples studied first isothermal combusted at low temperatures ranging from ambient to 300 C. The evolution of acid etching reactivity on the oil shale samples studied shows a competitiveness between material decomposition and thermal effect as a function of the temperature range considered by ashing at low temperatures (LTH) in combustion of the organic material, the mineral matrix can be kept to a minimum (A.Attaoui et al: 2022).We recall this study of the reactivity of acid attack on a few samples from three layers of the Tarfaya oil shale, in other words we are going to carry out a low-temperature ashing which consists of isothermal combustions from ambient to 300 C on these samples, more precisely on the organic part, with as little change as possible in the inorganic phases, followed by an acid attack (HCl) and a pH-meter (Tacussel) feedback, in order to understand the thermal effects and associated reaction mechanisms.