Studies of The Physical Properties and Reduction-Swelling Behavior of Fired Haematite Iron Ore Pellets

Abstract

Keeping in mind, during the course of mining, a large amount of iron and coal fines are generated, a technique need to be developed to make use of almost useless fines. In my project work, we are making studies of reduction-swelling behavior of nuggets made out from hematite ore under the influence of varying parameters. We studied the physical characteristics of fired iron ore pellets. As we increase the dose of binder, i.e., bentonite, the crushing strength & drop no. increases. Objectives of this project work is to investigate the effects of (a) reduction temp. & time (b) content of bentonite on swelling-reduction properties of fired hematite nuggets. The extent of reduction of fired pellets observed to be increased as we raise the temperature from 850?c-950?c.The extent of reduction of fired nuggets are observed to increasing with increase in length of time provided to the pellets for reduction. At 850?c, maximum percentage swelling is observed. This is due to the growth of pellet matrix as can be seen from SEM pics. Lowest degree of reduction is observed at 800°C and gives highest value at 950°C.Pellets reduced at higher temperature as 900 &950, gives slight decreased value than pellet reduced at 850°C because of sintering of pellet matrix as clearly seen in the SEM pics