ժҪ Phosphorus removal from oolitic high-phosphorus hematite using direct reduction followed by melting separation was investigated. At the direct reduction stage, highly volatile wood char was prepared by carbonizing jujube wood at 673 K for 2 h and was used as reducing agent. The results of the direct reduction tests show that at a temperature of 1373 K, a char mixing ratio of 0��8, and a reduction time of 10-25 min, the briquettes reached a metallization degree of 80%-84% and a residual carbon content of 0��13-1��98 mass%. Phosphorus remained in the gangue as calcium phosphate after reduction. The results of the melting separation tests show that residual carbon in reduced briquette negatively affects the phosphorus content (w��P��) in hot metal. When the reduced briquettes obtained under the aforementioned conditions were used for melting separation, hot metal suitable for basic oxygen steelmaking (w��P�ݣ�0��4 mass%) could not be obtained from metallic briquettes with a residual carbon content more than 1��0 mass%. In contrast, it could be obtained from metallic briquettes with residual carbon content less than 0��35 mass% by mixing with 2%-4% Na2CO3.
Abstract��Phosphorus removal from oolitic high-phosphorus hematite using direct reduction followed by melting separation was investigated. At the direct reduction stage, highly volatile wood char was prepared by carbonizing jujube wood at 673 K for 2 h and was used as reducing agent. The results of the direct reduction tests show that at a temperature of 1373 K, a char mixing ratio of 0��8, and a reduction time of 10-25 min, the briquettes reached a metallization degree of 80%-84% and a residual carbon content of 0��13-1��98 mass%. Phosphorus remained in the gangue as calcium phosphate after reduction. The results of the melting separation tests show that residual carbon in reduced briquette negatively affects the phosphorus content (w��P��) in hot metal. When the reduced briquettes obtained under the aforementioned conditions were used for melting separation, hot metal suitable for basic oxygen steelmaking (w��P�ݣ�0��4 mass%) could not be obtained from metallic briquettes with a residual carbon content more than 1��0 mass%. In contrast, it could be obtained from metallic briquettes with residual carbon content less than 0��35 mass% by mixing with 2%-4% Na2CO3.
��������:Phosphorus Removal of Oolitic High Phosphorus Iron Ore by GaseousReduction and Melt Separation
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E-mail: hqtang@ustb.edu.cn
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Hui-qing TANG,Yan-qi QIN,Teng-fei QI,Zhi-lei DONG,Qing-guo XUE. Application of Wood Char in Processing Oolitic High-phosphorus Hematite for Phosphorus Removal[J]. �й������ڿ���, 2016, 23(2): 109-115.
Hui-qing TANG,Yan-qi QIN,Teng-fei QI,Zhi-lei DONG,Qing-guo XUE. Application of Wood Char in Processing Oolitic High-phosphorus Hematite for Phosphorus Removal. Chinese Journal of Iron and Steel, 2016, 23(2): 109-115.
2016, Vol. 23 
