**Acknowledgements**

**4. Conclusions**

100 Iron Ores and Iron Oxide Materials

The raw siderite samples from the Hekimhan/Deveci region were subjected to calcination treatments at different temperatures (465, 500, 550, 600, 650, 700, 750, 800°C) for various duration time (5, 10, 15, 30, 45, 60 min) using the electrical furnace. Both the results of the experiments and the thermogravimetric analysis (TGA) showed that the most suitable calcination process was decided as 700°C for 15 min. The raw siderite (45, 60, 75, 90 min) and siderite calcined at 700°C (15, 30, 45, 60, 90 min) were milled. Significant behavioural differences between the two materials were identified. Calcination makes the grinding process much easier. The raw pellets were prepared

**Figure 19.** The effects of the bentonite ratio on the compressive strength of the pellets.

**Figure 20.** 30% by weight urea-added pellet obtained by microwave irradiation.

This research was supported by Inonu University with the project numbers of 2015/54 and 2016/120.
