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| BEHAVIOR OF FLUORINE IN BLAST-FURNACE SMELTING Ⅲ. MOVEMENT OF FLUORINE IN Al M~3 EXPERIMENTAL BLASTFURNACE SMELTING PAO-TOU IRON ORE |
| CHOW JEN;CHOU YUAN-HSI;HSU YUAN-SUN;HU CHENG-LING;MOW PEI-KEN;WANG WEI-YUAN;CHOW SHENG-HSIANG;HSU PAO-LING Institute of Metallurgy and Ceramics; Academia Sinica |
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Cite this article:
CHOW JEN;CHOU YUAN-HSI;HSU YUAN-SUN;HU CHENG-LING;MOW PEI-KEN;WANG WEI-YUAN;CHOW SHENG-HSIANG;HSU PAO-LING Institute of Metallurgy and Ceramics; Academia Sinica. BEHAVIOR OF FLUORINE IN BLAST-FURNACE SMELTING Ⅲ. MOVEMENT OF FLUORINE IN Al M~3 EXPERIMENTAL BLASTFURNACE SMELTING PAO-TOU IRON ORE. Acta Metall Sin, 1959, 4(1): 1-15.
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Abstract During two campaigns of smelting Pao-Tou iron ore in a 1 M~3 experimental blast-furnace,samples of furnace gas were taken at different levels and analyzed for fluorine and silicon. Inorder that absorption of fluorine from the furnace gas by the dust contained there-in shall not takeplace during cooling of the gas samples, a method has been devised for separating the dust fromthe furnace gas at the prevailing temperature. The dust samples were analyzed by chemical and X-raymethods. Besides, some solid samples were also taken from the furnace and analyzed chemically. From the results of this investigation, it has been found that the fluorine content of the furnacegas depends primarily on the temperature. Consequently, the fluorine content of the blast-furnacetop gas is expected to be extremly low when the top gas temperature is not unusually high. Infact, the top gas samples analyzed as low as 3—13 mg. of fluorine per M~3 under normal conditions.It has also been found that fluorine exists in the furnace gas predominantly in the form of HF.From a thermodynamic point of view, the reactions between HF in the furnace gas and CaO orCaCO_3 in the solid charge have been found to approach equilibrium closely. This fact explains whythe fluorine content of the furnace gas is controlled by temperature as a principal factor. From the distribution of fluorine among the various furnace products, it has been found that apredominant part of fluorine enters the slag, a small amount goes into the dust, while the fluorinecontent of the top gas is very low. From the evidence provided by X-ray investigation, it has beenestablished that fluorine exists in the dust chiefly as CaF_2. The mechanism of the movement of fluorine in the blast-furnace is briefly discussed.
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Received: 18 January 1959
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[1] S. Gericke und B Kurmies, Stahl und Eisen, Heft 9, 454 (1951) .
[2] 周仁等:金属学报,3(3) ,(1958) .
[3] Lenfesty, F. A. et al., Inid. Eng. Chem., 44, 1448 (1952) .
[4] Basic Open Hearth Steelinaking, p. 572, AINE, New York (1951) .
[5] Kenosg, H. H., Trans. AIME, 191, 137 (1951) . |
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