Abstract: According to the problems of sintering and ringing in rotary kiln caused by the high temperature during roasting the vanadium slag with calcium,the roasting dynamic conditions were enhanced and the roasting temperature was reduced by increasing the oxygen content in the intake air.Both of the laboratory and industrial experiments were conducted,and the results show that roasting temperature,920~940℃ before the experiments,decreases to 870~885℃ after adopting the oxygen-enriched roasting by controlling the oxygen content in the outlet air in the range of 12%~14%.During the industrial tests,most of the clinker exists in the form of powder and the leaching rate of vanadium is 89.58%,coupled with normal operation of the rotary kiln.The operation problems of the roasting equipment are resolved.Meanwhile,roasting vanadium slag without tailings is realized by employing the oxygen-enriched calcium method.