ガラス-結晶法による塩化鉄焙焼酸化鉄の高純度化

概要

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The experiment has been carried out for the purification of α-Fe_2O_3 by the glass-ceramic method. After melting the roasted product of the waste pickling liquor with Na_2O-B_2O_3 fluxes having the Na_2O/B_2O_3 (mole ratio)=1/2-1/5, the glass samples obtained by rapid quenching crystallized at temperatures ranging from 550 to 1000℃ for 55 s to 24 h. The separation of the precipitated α-Fe_2O_3 from the flux was conducted by wet chemical treatment with water and dilute HCl solution, after which high purity and fine α-Fe_2O_3 crystals were obtained. The impurity contents, Fe yield, and crystal shape and size have been investigated as a function of crystallization time, temperature and flux compositions. Dissolution of the crystallized fine α-Fe_2O_3 particles by dilute HCl solution in stepwise manner, and subsequent analysis of impurities in each stage showed that the contents of Si, Na, B, Ca, and Al were enriched on the crystal surface.
社団法人日本鉄鋼協会の論文
1990-10-01