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Phosphorus removal from oolitic high-phosphorus hematite using direct reduction followed by melting sep-aration was investigated.At the direct reduction stage,highly volatile wood char was prepared by carbonizing j uj ube wood at 673 K for 2 h and was used as reducing agent.The results of the direct reduction tests show that at a tem-perature of 1 373 K,a char mixing ratio of 0?8,and a reduction time of 10-25 min,the briquettes reached a metal-lization 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 ob-tained under the aforementioned conditions were used for melting separation,hot metal suitable for basic oxygen steelmaking (w[P]<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% Na2 CO3 .

参考文献

[1] P. Delvasto;A. Valverde;A. Ballester.Diversity and activity of phosphate bioleaching bacteria from a high-phosphorus iron ore[J].Hydrometallurgy,20083/4(3/4):124-129.
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