南米アルガロボ鉄鉱石によるペレツトの製造

抄録

Balling and pelletizing test were conducted for the sample of Algarrobo iron ore concentrate at the Pilot Plant and Research Laboratory of Kobe Steel, Ltd. The purpose of the test was to obtain technical data necessary for planning and engineering of the Grate Kiln system pelletizing plant for Acero del Pacifico SA. in Chile.
Prior to the pelletizing test, wet type magnetic separation of crude ore was performed and concentrate of 1540 cm²/g Elaine surface area with iron content of 69% was obtained.
Pelletizing test was performed to produce two type of pellets, that is, pellet with bentonite and with lime hydrate as additives.
In case of using bentonite as an additive, pellets preheated at high temperature were apt to produce concentric crack inside of them in the preheating and burning stage. As results product pellet had lower cold compressive strength and poor reducibility of JIS reduction test.
While, in case of using lime hydrate as an additive formation of crack in the preheated pellet was not obserbed at all even at the higher preheating temperature. However, pellet added two percent lime hydrate showed remarkable swelling in the reduction stage. Pellet added three percent lime hydrate were good and could satisfy all condition of the required qualities.
Out line of the pelletizing plant installed at Huasco district in Chile which started into operation from the beginning of 1977 is also introduced.