 FUTURE TECHNOLOGIES FOR ENERGY-EFFICIENT IRON 0000-0-00 · The energy for iron ore reduction is liberated when iron returns to the more stable iron oxide, a process known as rusting. Unfortunately, this energy is hard to recover. In practice, the energy demand for crushing and grinding, pelletizing, and/or sintering iron ore, along with shaping, may constitute a considerable part of the energy demand ... Reducing Grinding Energy and Cost -Magnetite Iron Ore ... Reducing Grinding Energy and Cost -Magnetite Iron Ore Design Case Study ... flexible and energy efficient solution for crushing hard rock with relatively low moisture content 