The physical properties of minerals are mainly hardness, specific gravity, specific magnetic susceptibility and so on.

Since the slag is occurring pyrite to the edges of the desulfurization debris formed upon firing, porous mineral particles become loose. The minerals in the slag do not have a crystalline form, and are combined in the form of soil, powder, and gel. The texture is very loose and broken, so it is difficult to determine its hardness.

The specific gravity of the pyrite cinder was determined by the pycnometer method. Calculate the specific gravity of the slag by the following equation:

Where: G-sample dry weight (kg);

G ₁ - bottle, hydration weight (kg);

G ₂ - bottle, water, sample weight (kg);

â–³-media specific gravity;

δ - specific gravity of the sample.

The specific gravity of the magnetite in the cinder was 3.783, and the specific gravity of hematite was 3.973. Both are lower than the specific gravity of natural minerals (d natural magnetite = 4.9 to 5.2, d natural hematite = 4.8 to 5.3). (See Table 1, Table 2)

Table 1 Determination of specific gravity of magnetite in pyrite cinder

Table 2 Determination of specific gravity of hematite in pyrite cinder

Pyrite crumbs are de-angled during firing to form particles of various shapes. The cubic crystal form of pyrite easily forms spherical particles, and the mineral particles become loose and porous due to the escape of a large amount of gas, and the composition also changes. The minerals in the slag are very loose and broken, with many honeycombs, disseminated and residual structures, especially the disseminated structure. The mineral structure in the slag mainly has a honeycomb structure, a semi-self-shape, a crystal structure, a disseminated structure, a residual structure and a wrapped structure.

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