Abstract
Optical properties of the crystals in the basic open hearth furnace slags were determined by means of petrographic microscope. The results were as follows:(1) The columuar crystals appeared in the low basisity (CaO/SiO2<1.2) slags were olivine, whose chemical formula was CaO·RO·SiO2 (R=Fe, Mn or Mg).(2) The spindle-shaped crystals in the slags of basisity between 1.2 and 1.9 were merwinite, written as 3 CaO Ro 2 SiO2 (R-Fe, Mn or Mg)(3) Globular crystals which appeared in the slags of basisity between 1.4 and 2.9 were α-dicalcium silicate.(4) Needle-like crystals in the high basic slags were tri-calcium silicate.(5) Angular shaped matrix of the high basic slags were mixed crystals of dicalcium ferrite and brownmillerite.With reflecting microscope, ionic components of these crystals were revealed by the colorizing method, such as SiO-4 with ammonium molybdate and benzidine, Ca++ with Lembergs solution, Fe++ and Mn++ with acidic pottasium ferricyanide, Fe+++ or Fe2O4-- with ammonium rhodanate, and S++ with acetone solution of ammoniacal cobaltous nitrate.
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