Activity of silica in calcium-aluminate based slags
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This research has been supported by the Belgian American Educational Foundation, and by the United States Department of the Interior's Mineral Institutes program administered by the Bureau of Mines under allotment grant number G 1154106.
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REFERENCES
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1. R.T. McAndrew, S.S. Wang, and W.R. Brown: CIM Bulletin, Jan. 1975, pp. 101-10. 2. R. M. Smith and A. E. Martell: Critical Stability Constants. Volume 4: Inorganic Complexes. Plenum Press, New York, NY, 1976. 3. A. Ringbom: Complexation in Analytical Chemistry, lnterscience Publishers. 1963. 4. D. Pouillon: M. S. Thesis, University of California, 1985.
pH Fig. 4 - - C o m p a r i s o n between predicted ( .... ) and measured extraclion behavior for the extraction of Fe(lll) with Neodecanoic acid, [HR],, = 1.7 M, [FeJ,, = 0.05 M, 1 = 2.0 M, assuming the formation of (FeOHR:), and log K,, = - 0 . 5 : • NO~, • CI , • SO~ .
Activity of Silica in CalciumAiuminate Based Slags BAHRI OZTURK and R.J. FRUEHAN
SYMBOLS USED
[Cl
concentration of metal carboxylate complex, ( M ( O H ) q R , - q " mHR)x, in the organic phase equilibrium constant for solvent extraction K. (in terms of analytical concentrations) dissociation constant of water concentration of free ligand, L ~ , in the aqueous ILl phase [L]tot total concentration of ligand L in the aqueous phase [M] concentration of M "+ ions in the aqueous phase [M],q total concentration of metal M in the aqueous phase [M]org total concentration of metal M in the organic phase [M]0 initial concentration of metal M in aqueous phase solvation number of the metal extractant complex m degree of polymerization of the free acid extractant P degree of hydrolysis of the extracted cation q [HR] concentration of acid extractant, HR, in the organic phase degree of polymerization of the metal extractant x complex O, overall stability constant for formation of specified individual complexes ~aO,H b overall formation constant for the complex L f~c.d,e
IzL
Ma(OH)b
overall formation constant for the complex McLd(HL)e sum of overall formation constants of complexes containing L used to relate the total concentration of L in the aqueous phase and the concentration of free ligand
746--VOLUME 18B, DECEMBER 1987
In recent years, calcium-aluminate based fluxes have been used in ladle refining processes to produce clean steel. Calcium-aluminate slags used in these processes may contain small amounts of silica resulting from silicon oxidation or steelmaking slag carried over into the ladle. Reactions may occur between silica in the slag and metal. For example, in the ladle treatment of aluminum killed steel, with calcium aluminate based slags, some aluminum may be oxidized by silica in the slag. In order to help control the reactions between the slag and metal, a knowledge of the activity of silica at low concentrations in calcium-aluminate slags is necessary. In addition, in order to cast an aluminumkilled steel it is necessary to convert alumin
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