Dephosphorization of molten pig iron containing chromium by lithium carbonate.
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概要
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The dephosphorization of molten pig iron containing 18% chromium by the addition of Li2CO3 has been studied using a laboratory scale high frequency induction furnace. The degrees of dephosphorization, desulfurization, and denitrification obtained by adding 60-125g/kg-metal of Li2CO3 to molten pig iron (0.03% P, 0.03% S, 0.02% N) containing chromium in a graphite crucible were more than 80%. The oxidation loss of chromium was less than 0.5%. The degree of dephosphorization by the addition of Li2CO3 was 2.1 times as large as that by the addition of Na2CO3 when the same weight of flux was added to the melt. The slag basicity after treatment by Li2CO3 was higher than that by Na2CO3. The degree of dephosphorization decreased remarkably with increasing temperature. It is preferable to treat the pig iron at a temperature below 1 480°C. The carbon content of pig iron had a remarkable effect on the dephosphorization reaction. When the carbon content was low (3.5%), the oxidation loss of chromium was very large and the degree of dephosphorization was lowered to about 20%. By X-ray diffraction analysis, Li4SiO4 and LiCrO2 were identified in the slag after treatment, and Li3PO4 in the phosphorus-enriched slag.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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