The invention provides a heat exchange type
roasting device and a process for extracting
lithium from
spodumene, and relates to the technical field of
waste heat exchange and utilization, the heat exchange type
roasting device comprises a
roasting furnace, a bent
pipe, a heat exchange mechanism and a communicating mechanism; the bent
pipe is installed above the roasting furnace, the heat exchange mechanism comprises a heat exchange box installed at the top of the roasting furnace, a heat exchange
pipe is installed in the heat exchange box, and a water inlet pipe and a water outlet pipe are installed at the left end and the right end of the heat exchange pipe in a sealed mode respectively. According to the scheme, the
heat load requirement can be accurately matched, the size of the inlet hole is adjusted according to the actual requirement of the heat exchange box, excessive or insufficient
waste heat supply is avoided, meanwhile, the heat utilization accuracy is improved, the heat exchange efficiency is optimized, the flow speed and flow of a high-temperature medium are controlled by adjusting the inlet hole, the
retention time of the medium in the
heat exchanger is more reasonable, and the
heat transfer efficiency is improved; waste and excessive consumption of
waste heat can be avoided, the size of an inlet hole is adjusted to be matched with a
heat load, and when heat needed by follow-up equipment is reduced, redundant waste heat is prevented from being directly discharged.