Comparing to the other iron tailings, the content of the oxide forms of potassium and aluminum is too high, while a lower content of the oxide forms of silicon. This result revealed that the main phases of iron tailings was aluminosilicate. A lower content of the oxide forms of calcium and magnesium confirmed that the appearance of anorthite and diopside phases in the iron tailings [7]. Fig. 1 shows the XRD patterns of the mixture (b) and the sample foamed at 830 °C for 30 min (a). According to the Fig. 1, the main crystalline phases of iron tailings