The distribution ratio of nickel between Ag-Ni alloy and CaO-SiO2-FetO slag at high temperatures was measured to clarify the dissolution mechanism of nickel in this melt. Also, the nickel oxide capacity was suggested and was compared to phosphate and sulfide capacities. The dissolution mechanism of nickel into the CaO-SiO2-FetO slags could be described by the following equation from the effect of oxygen potential and slag basicity on nickel dissolution behavior: Ni (1) + 1/2 O2 (g) + O2- (slag) = NiO22- (slag). The nickel oxide capacity increases with increasing CaO/SiO2 ratio at a fixed FetO content. When the ratio of XCaO to XSiO(2) (C/S) is about 1.1 to 1.3, log CNiO(2)(2-) increases with increasing FetO content up to about 35 mol pct, followed by a nearly constant value of CNiO(2)(2-) ≅ 103. In the composition of C/S = 0.5 to 0.7, log CNiO(2)(2-) exhibits a maximum value at about 50 mol pct FetO. From the iso-CNiO(2)(2-) trends in ternary phase diagram, nickel oxide capacity dominantly depends on FetO content in slags; it exhibits a maximum value of CNiO(2)(2-) ≅ 103 at XFe(t)O ≅ 0.5. The relationship between nickel oxide capacity and phosphate (sulfide) capacities exhibit linear correlations, as expected from theoretical equations.
|Number of pages||5|
|Journal||Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science|
|Publication status||Published - 2002|
Bibliographical noteFunding Information:
This work was financially supported by the Korea Institute of Geoscience and Mineral Resources (Grant No. 97-LD-01-04-A-01). Also, some of the authors (SHL and JHP) were supported by the Brain Korea 21 Project.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry