Immersion Treatment of Sinter into CaCl₂ Aqueous Solution

Abstract

The immersion of sinter into CaCl₂ aqueous solution and subsequent drying have been carried out. The immersion treatment of sinter was carried out at room temperature under the normal pressure and in vacuum. The CaCl₂ concentration of aqueous solution was changed from 1.0 to 10.0 wt%. The effect of immersion treatment on the reducibility index (RI) and reduction degradation index (RDI) of sinter have been studied.
The main results obtained are as follows :
1) On the immersion under the normal pressure, RI decreased only slightly and RDI decreased remarkably with increase of CaCl₂ concentration in solution.
2) On the immersion in vaccum, RI maintained the value of original sinter and RDI decreased more than the value on the immersion under the normal pressure.
3) Decrease of RDI of sinter was caused by the delay of the reduction rate due to adhered CaCl₂ layer in pore surface and resultant decrease of the amount of cracked magnetite particles.