期刊
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
卷 23, 期 2, 页码 109-115出版社
SPRINGER
DOI: 10.1016/S1006-706X(16)30021-8
关键词
high-phosphorus hematite; wood char; direct reduction; melting separation; phosphorus removal
资金
- National Natural Science Foundation of China [51144010]
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] <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.
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