Abstract
The immersion of sintered product into CaCl2, CaBr2 aqueous solution and CaF2 suspended solution at room temperature in vacuum and subsequent drying have been carried out. The halide concentration of solution was changed from 0.5 wt% to 10.0 wt%. The effect of immersion treatment on the reducibility index (RI) and reduction degradation index (RDI) of sintered product have been studied.
The main results obtained are as follows:
(1) On the immersion into CaCl2 aqueous solution, RI was slightly decreased and RDI remarkably im-proved.
(2) On the immersion into CaBr2 aqueous solution, RI was maintained in the value of original sintered product and RDI was more improved than in the case of CaCl2 solution.
(3) On the immersion into CaF2 and Ca(OH)2 suspended solution, the effect of immersion treatment on RI and RDI was scarcely seen.
(4) Improvement of RDI was caused by the delay of the reduction rate due to CaCl2 and CaBr2 layer adhered inside of the pore and resultant decrease of the amount of cracked magnetite particles.
