Dephosphorization of complexly alloyed nickel melts under vacuum induction melting conditions: II. Experimental results and their interpretation

• Published in: Russian metallurgy Metally 2013-05, Vol.2013 (5), p.321-326
• Main Authors: Burtsev, V. T., Anuchkin, S. N., Sidorov, V. V., Rigin, V. E.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Ceramics; Chemistry and Materials Science; Crucibles; Dephosphorization; Materials Science; Melts; Metallic Materials; Slags; Systems (metallurgical); Wettability
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S0036029513050042

The activities of the components of BaO-BaF 2 -BaCl 2 -NiO and CaO-CaF 2 -CaCl 2 -NiO slags systems, which were considered as a phase having a collective electron system, are calculated, and it is shown that the barium, calcium, and oxygen activities at 1600°C are maximal in the BaO- and CaO-based systems depending on the main oxide content. The dephosphorization of three types of nickel-based melts by slags of 14 compositions in crucibles made of Al 2 O 3 , MgO, and MgO-Al 2 O 3 (80-20 wt %) is experimentally studied, and the degree of dephosphorization is shown to depend on the phosphorus content in a metal, the slag composition, and the crucible material (degree of dephosphorization is maximal in Al 2 O 3 crucibles). The forming slag is assimilated by Al 2 O 3 and MgO-Al 2 O 3 ceramics with a porosity of about 30%. If 4–10 wt % NiO are present in a slag, the wettability of the Al 2 O 3 ceramic is significantly higher than that of the MgO-based ceramic.