Dephosphorization of high-level phosphorus iron ore by gas-based reduction and melt separation
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摘要: 針對鄂西鮞狀高磷鐵礦難選、難冶的特點,從該礦礦相結構分析出發,在使用HSC計算化學軟件的熱力學模擬和具體實驗的基礎上,提出了氣基還原+電爐熔分冶煉高磷鐵礦的新型工藝.實驗結果與HSC軟件模擬結果吻合.實驗室含P 1.28%的高磷鐵礦通過CO還原后熔分,得到含P 0.27%的低磷鐵;通過H2還原后熔分,得到含P 0.33%的低磷鐵.由熔分鐵的SEM和EDS結果證實,P仍以夾雜物的形態存在,可以在熔分時通過去除鐵水中夾雜物的方法進一步脫磷,以滿足煉鋼的要求.Abstract: The traditional methods of mineral and metallurgical processes are very difficult in treating the high-level phosphorus iron ore from west Hubei Province of China to meet the requirements of the iron and steel industry. A new technical route, gas-based reduction and electrical furnace melt separation, was proposed and demonstrated. Based on the mineral phases, thermodynamic simulation (performed with HSC) was carried out first, and then gas-based reduction experiment and electrical furnace melt separation experiment were conducted. Gas-based reduction results agree with the numerical simulation. The phosphorus content decreases from 1.28% in the ore sample to 0.27% in the final metal sample by using CO reduction and melt separation; and it decreases from 1.27% in the ore sample to 0.33% in the final metal sample by using H2 reduction. The melt separation SEM and EDS analyses of metal samples after melt separation show P exists as impurities. These impurities can be removed by refining methods in the melting stage to meet the requirements of steelmaking.
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Key words:
- high phosphorus iron ore /
- gas-based reduction /
- melt separation /
- dephosphorization
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