A mortar composition containing recycled alumina from alumina waste of chemical or petroleum facilities is provided to be used for manufacturing refractory linings with desired mechanical strength and to give the linings with concrete explosion resistance and structure collision protection performances by primarily comprising the recycled alumina especially obtained from FCC catalyst waste. The composition includes recycled alumina prepared by heat treating waste alumina used in drying agent, adsorbent and/or catalyst carrier then discarded. The composition is prepared by adding solid fraction comprising: 5-50wt.% of cement; 10-80wt.% of the recycled alumina; 1-20wt.% of heat insulating aggregate; and 0.01-5wt.% or organic fiber to water. The cement is selected from typical Portland cement, white Portland cement, alumina cement, early strength Portland cement or high early strength cement. The heat insulating aggregate is recycled catalyst obtained by heat treating FCC catalyst waste.