酸素上吹き溶銑精錬時のNa2CO3スラグの特性
1983 年 69 巻 1 号 p. 32-41
詳細
1983 年 69 巻 1 号 p. 32-41
Change in chemical composition of slag during the refining of hot metal with Na2CO3 under the condition of top-oxygen blowing in the temperature range from 1 280 to 1 450°C was studied.
Violent decomposition of Na2CO3 in the presence of [C] was observed at the beginning of experiments. However, total amount of Na evaporated from slag during the experiment was not conspicuous. Rate of vaporization of Na was found to decrease with decreasing reaction temperature and with increasing contents of acidic compounds in the slag, such as SiO2 and P2O5.
Judging from material balance calculation for S, some part of charged S was considered to be transferred to waste gas. Chemical analysis of the dust and slag indicated that the preferential vaporization of S and Na from the slag occurred. Vaporization loss of P was not detected by chemical analysis of dust and slag. However, the study with thermal-balance showed that Na3PO4 reacted readily with graphite and converted to CO, P and Na above 1 000°C.
