·The heat hardening or induration of pellets employs one of the three conventional furnace types vertical shaft furnace grate kiln system and travelling straight grate The latter process that was primarily developed by Lurgi and is currently owned by OutoKumpu Technology accounts for two thirds of the world s installed pelletizing
·CIRCULAR PELLETIZING TECHNOLOGY • Proven process technology as utilized in straight grate pelletizing plants • Induration furnaces with pellet output capacities between and million t/a • Extremely small footprint and low space requirement • Highly efficient utilization of circular grate equipment only
·generation in the straight grate is the use of a hearth layer fraction which while being recycled tends to generate more dust BED HEIGHT AND PRESSURE DROP Comparing both technologies the bed height in the straight grate technology is higher The straight grate technology requires the use of hearth layer which ranges
·When investors assess the two well proven pelletizing technologies the straight grate and grate kiln the most appropriate choice may not be immediately evident Certain technical market and
·Evolution of binders for iron ore pelletizing Induration technologies Challenges and innovations in iron ore pelletizing Advertisement 2 Pelletizing process and raw materials The straight grate process is composed of a single furnace where an endless line of pallet cars moves A layer of indurated pellets is arranged at the bottom of
·both Straight Grate and Grate Kiln technologies therefore ensuring our customers get the best technology fit for their specific ore and product requirements With strength and expertise in both Straight Grate and Grate Kiln technologies Metso s equipment parts and services for pelletizing process are designed to increase capacity reduce
·In 1951 due to the small capacity of shaft furnace large scale straight grate pelletizing began to be studied in the United States In 1955 the world s first straight grate pelletizing plant with an annual output of 600 000 tons in Risev Plant In 1960 the world s first grate kiln pelletizing plant was built in Humboldt USA
As the world s reserves of coarse and high grade iron ores continue to shrink beneficiation is becoming increasingly important The resulting concentrates cannot be used directly as feedstock for iron making but require an additional agglomeration step Pelletizing is preferred because the uniform chemical physical and metallurgical characteristics of pellets make them a more
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