In this article results of thermodynamic analysis and technology of subsequent, third stage, of ferronickel refining by oxygen first in the acid converter for the purpose of reducing content of silicon, chrome and partially carbon and then in the basic converter for removal of phosphorus, carbon and sulfur up to the limit values in correspondence with requirements of TU U 27.3-31076956-009:2005 are generalized.
Processes of ferronickel refining in basic converter. Because of increased erosion of silica brick lining in acid converter only a part of silicon and carbon are oxidized.
Process of ferronickel dephosphorization in basic converter during its blowing by oxygen under high-basicity slag with high content of (FeO) may be presented in general form by the following summarized reaction [5, 8]:
Ferronickel refining in basic converter of up to 50 t capacity (mass of the metal being processed is 33-35 t) is performed under slag, which by the end of the process has the following composition,%: 0.2-0.3 Ni; 20-30 CaO; 5-15 Si[O.sub.2]; 45-51 (57-64) Fe (FeO); 7-20 (9-26) Cr (CrO).
Also, new sections on design of multiple-winding magnetic and resonant inverter design; additional appendices on Computer Simulation of Converters using averaged switch modeling, and Middlebrook's Extra Element Theorem, including four tutorial examples; and expanded treatment of current programmed control with complete results for basic converters
, and a great deal more.