硬燒マグネシア中の添加酸化鐵の状態 (1)

抄録

This report shows an action and a state of the existence of MgO⋅Fe₂O₃ which formed in the magnesia clinker, under a condition of various heat treatments.
In this experiment we used those sample, which were made as follows: Adding Fe₂O₃ as a mineralizer to pure MgO and light burned magnesia, which obtained from raw magnesite containing a small amount of CaO, and then fired them 1300-1600°C for 3hr, and cooled rapidly and slowly respectively.
An action and a state of MgO⋅Fe₂O₃ in those samples were determined by means of outsight observation; chemical, microscopic and X-Ray analysis and chemical activity.
From above experiment, we obtained following results that, (i) chemical constituent of each samples does not shows any difference, (ii) MgO⋅Fe₂O₃ forms a solid solution with MgO in the case of rapidly cooled sample (state at high temperature), but it forms a mechanical mixture with MgO in the case of slowly cosled sample (state at low temperature), (iii) the periclase in the later sample shows a redish brown color owing to MgO⋅Fe₂O₃, which existence in a net-like pattern on it, and it shows a strong magnetic properties, moreover Fe₂O₃ and MgO⋅Fe₂O₃ in clinker shows a chemical inactivity, (iv) the periclase in the former sample a light color and transparency such as pure MgO and dose not shows any strong magnetic properties, moreover Fe₂O₃ and MgO⋅Fe₂O₃ in the clinker shows a chemical activity.