The effect of B2O3 on dephosphorization of molten steel by FeOx-CaO-MgOsatd.-SiO2 slags at 1873 K

被引：28

作者：

Hamano, T ^{[1
]}

Tsukihashi, F ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Frontier Sci, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

来源：

ISIJ INTERNATIONAL | 2005年 / 45卷 / 02期

关键词：

thermodynamics; phosphorus; dephosphorization; FeOxCaO-MgO-SiO2; system; CaO dissolution; B2O3;

D O I：

10.2355/isijinternational.45.159

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Reducing the exhaust amount of steelmaking slag is strongly required because of the view point of environmental conscious. CaO is often used for steelmaking slag but its high melting point prevents from reuse of slag as resources because free-CaO exists in the melt. Therefore highly dissolution of CaO is the key for reducing steelmaking slag. It was reported that B2O3 accelerates CaO dissolution into slag, however, few study about B2O3 containing slag has been conducted. The present work measured phosphorus partition ratio between liquid iron and MgO saturated FeOx-CaO-MgOsatd.-SiO2-B2O3 melts or MgO and CaO doubly saturated FeOx-CaOsatd.-MgOsatd.-SiO2-B2O3 melts at 1873 K. If SiO2 was replaced by B2O3, phosphorus partition ratio does not change. The maximum phosphate capacity is 10(19.06) for MgO and CaO doubly saturated FeOx-CaOsatd.-MgOsatd.-B2O3 system. The activity coefficient of PO2.5 is calculated as a function of CaO content and following equation is derived for present experimental conditions. log gamma(PO2.5) = -6.2 - 0.046 X (mass%CaO)

引用

页码：159 / 165

页数：7

共 24 条

[11]

ONOYE T, 1973, 4 JAP USSR JOINT S P, P100

[12] PARTITION OF MANGANESE BETWEEN ALPHA-FE2O3 CRYSTAL AND NA2O-B2O3 MELTS [J].

PARK, BH ;

SUITO, H .

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 1990, 76 (10) :1688-1695

[13] REDOX EQUILIBRIA OF FE AND MN IN THE NA2O-B2O3 MELTS [J].

PARK, BH ;

SUITO, H .

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 1991, 77 (02) :217-223

[14]

RICHARDSON FD, 1948, J IRON STEEL I, V160, P261

[15]

Sakao H., 1959, J JPN I MET, V23, P671, DOI DOI 10.2320/JINSTMET1952.23.11_671

[16]

SATO A, 1986, TETSU TO HAGANE, V73, P283

[17]

SELIN R, 1991, SCAND J METALL, V20, P279

[18]

Suito H., 1981, TETSU TO HAGANE, V67, P2645

[19]

The Japan Society for the Promotion of Science, 1988, 19 COMM STEELM STEEL, P279

[20] Assessment of P2O5 activity coefficients in molten slags [J].

Turkdogan, ET .

ISIJ INTERNATIONAL, 2000, 40 (10) :964-970

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