| 摘要 |
<p>PURPOSE:To manufacture a composite refining agent for secondary steel refining excellent in meltability and reactivity by blending uniformly specific percentage of respectively powdered or granular materials of quick lime, fluorite, calcium carbide, deoxidizers, and carbon and by compacting the resulting mixture. CONSTITUTION:The mixture containing, by weight, >=50% quick lime, 5-20% fluorite, and <=10% calcium carbide and also containing deoxidizers and carbon in the amounts specfied by inequalities [C]<6, (CaO)/(SiO2)> 2.3, and 0.4[Ca]+1.4[Si]+1.33[C]>9 is prepared. In the above inequalities, [C] means the sum of raw-material carbon quantities ]wt%]; (CaO) and (SiO2) mean, severally, the total amounts of Ca and Si expressed in terms of CaO and SiO2, respectively [wt%]; [Ca] means the sum of Ca content in CaC2 and calcium silicon [wt%]; and [Si] means the sum of Si content in silicon carbide, calcium silicon, and ferrosilicon [wt%]. The above components (about 10-20mm grain size) are crushed to <= about 5mm and mixed uniformly, and the resulting mixture is compacted into spherical shape of about 10-20mm so as to be formed into acomposite refining agent.</p> |
