中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2015年
1期
220-226
,共7页
高铝铁矿石%硫酸钠%碳酸钠%还原%动力学
高鋁鐵礦石%硫痠鈉%碳痠鈉%還原%動力學
고려철광석%류산납%탄산납%환원%동역학
high-aluminium iron ore%sodium sulfate%sodium carbonate%reduction%dynamics
采用纯物质试验、等温还原法和微观结构分析法研究硫酸钠和碳酸钠对高铝铁矿钠化还原动力学规律的影响。结果表明:铁?铝?硅氧化物体系添加钠盐还原焙烧时,铁氧化物的还原转变规律为Fe3+→FeO→Fe,其中在还原初期30 min以内,添加硫酸钠时,铁氧化物的还原较添加碳酸钠的要快。硫酸钠和碳酸钠均能显著提高高铝铁矿的金属化率和还原度,加快还原反应速率,在还原初期30 min以内,不添加钠盐时还原反应速率常数为2.31,添加碳酸钠时升高到3.34,添加硫酸钠时达到3.92。高铝铁矿石还原初期(15 min以内),以硫酸钠为添加剂,球团内部金属铁晶粒明显,铁晶粒粒径范围为1~10μm;以碳酸钠为添加剂,球团内部金属铁晶粒几乎不可见,边缘可见铁晶粒与脉石成分连生。
採用純物質試驗、等溫還原法和微觀結構分析法研究硫痠鈉和碳痠鈉對高鋁鐵礦鈉化還原動力學規律的影響。結果錶明:鐵?鋁?硅氧化物體繫添加鈉鹽還原焙燒時,鐵氧化物的還原轉變規律為Fe3+→FeO→Fe,其中在還原初期30 min以內,添加硫痠鈉時,鐵氧化物的還原較添加碳痠鈉的要快。硫痠鈉和碳痠鈉均能顯著提高高鋁鐵礦的金屬化率和還原度,加快還原反應速率,在還原初期30 min以內,不添加鈉鹽時還原反應速率常數為2.31,添加碳痠鈉時升高到3.34,添加硫痠鈉時達到3.92。高鋁鐵礦石還原初期(15 min以內),以硫痠鈉為添加劑,毬糰內部金屬鐵晶粒明顯,鐵晶粒粒徑範圍為1~10μm;以碳痠鈉為添加劑,毬糰內部金屬鐵晶粒幾乎不可見,邊緣可見鐵晶粒與脈石成分連生。
채용순물질시험、등온환원법화미관결구분석법연구류산납화탄산납대고려철광납화환원동역학규률적영향。결과표명:철?려?규양화물체계첨가납염환원배소시,철양화물적환원전변규률위Fe3+→FeO→Fe,기중재환원초기30 min이내,첨가류산납시,철양화물적환원교첨가탄산납적요쾌。류산납화탄산납균능현저제고고려철광적금속화솔화환원도,가쾌환원반응속솔,재환원초기30 min이내,불첨가납염시환원반응속솔상수위2.31,첨가탄산납시승고도3.34,첨가류산납시체도3.92。고려철광석환원초기(15 min이내),이류산납위첨가제,구단내부금속철정립명현,철정립립경범위위1~10μm;이탄산납위첨가제,구단내부금속철정립궤호불가견,변연가견철정립여맥석성분련생。
The effects of Na2SO4and Na2CO3on the sodium-reduction kinetics of high-aluminium iron ore were studied by pure material testing isothermal reduction method and microstructure analysis method. The results indicate that, when the Fe2O3-Al2O3-SiO2system is reduced roasting with addition of sodium, the transformation law of iron oxide is as follows: Fe3+→FeO→Fe, and at the beginning of the reduction (within 30 min) with addition of Na2SO4, the iron oxide reduction rate is faster than that of Na2CO3. Both Na2SO4 and Na2CO3 can improve the metallization rate and reducibility of the high-aluminium iron ore, and accelerate the reduction reaction rate. At the beginning of the reduction(within 30 min), the reduction reaction rate constant is 2.31 when there is no sodium added, and the reaction rate constant rises to 3.34 with addition of Na2CO3, and the rate constant reaches 3.92 with addition of Na2SO4. At the beginning of the reduction(within 15 min), the metallic iron grain in the pellets is clear when using Na2SO4 as the addition, and the size of metallic iron grain is 1?10μm. While there is almost no metallic iron grain in the pellets when using Na2CO3 as the addition, and the metallic iron grain associates with gangue at the edge of the pellet.