Abstract
Measurements of the circulation flow rate of molten pig iron on the Gas-lift Mixing Reactor process (GMR process) were carried out and the relationship between the circulation flow rate and the desulphurization efficiency by the GMR process was examined. The results are summerized as follows;
(1) The water model tests in industrial scale on measurement of the circulation flow rate were carried out and the circulation flow rate Vlm3/min can be represented by the equation
at 5<vg ≤vg°, Vl= { (-2.75Hd+6.35) √vg-15Hd-7} VP
and
at vg° ≤vg<210, Vl= (-10Hd+44) VP
where vg: apparent gas velocity m/min, vg°: critical gas velocity m/min (= {-1.82+22.75/ (2.31-Hd) } 2), Hd: Lifting height m, VP: effective volume of the lifting tube of GMR m3 (=Hs. S), Hs: submerged depth m, and S: cross-sectional area of the lifting tube m2.
(2) The results of the volume circulation flow rate of molten pig iron measured at the industrial test plant agree very well with these of water model test. The circulation flow rate of the 200 t commercial plant constructed at Kobe Steel's Kakogawa Works is about 100t/min.
(3) The strong dependence is observed between the desulphurization efficiency and the circulation flow rate on the process.
