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将以前研究所得到的热力学模型进行扩展以便于在1300—1900℃温度范围内遍布整个 Fe-Mn-C 三元系锰和碳活度的数学计算。该模型可以预测特定锰浓度条件下碳和硅的限定浓度。例如,吹氧末期,在1750℃80%锰铁中1.3%C 和0.3%Si 浓度与饱和氧化锰渣相平衡。脱碳之后,渣中 MnO 含量约为65%。脱碳后锰的回收率明显地取决于渣量,一般回收率范围在80—90%之间。使渣相还原能显著地改善锰回收率。 相似文献
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分析了转炉吹氧炼制中、低碳锰铁过程中测定的渣样、铁样、炉气祥和熔池温度的资料。讨论了吹炼过程中脱硅、脱碳及锰的氧化、挥发机理。提出了比较合理的供氧制度,并据之改进工艺操作,以保证脱硅、脱碳效率,提高锰回收率。 相似文献
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锰铁吹氧脱碳的热力学探讨 总被引:1,自引:0,他引:1
中碳、低碳锰铁是炼钢的重要材料。国内外生产这些合金所用的传统方法,是用电炉先炼出硅锰合金,然后以它为还原剂,在另一电炉内与富锰矿和富锰渣一起,炼出锰铁。这样的工艺比较复杂,电耗大,成本较高。我国铁合金工业经过试验,已成功地以普通碳素铬铁为原料,用氧气转炉脱碳,生产中碳和低碳铬铁。关于这个工艺的热力学基础见。勇于革新的铁合金工作者提出以类似的方法,从碳素锰铁生产中碳、低 相似文献
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The effect of oxygen/argon mixing ratio in the bottom blowing gas on the decarburization behaviour of high carbon ferromanganese melt was investigated in the temperature range of 1350 – 1550°C. Thermodynamic analysis indicates that high melt temperature and low PCO are essential for an effective decarburization. An empirical equation for the utilization ratio of oxygen for decarburization was derived as functions of the melt temperature and the oxygen/argon mixing ratio in the refining gas. The utilization ratio of oxygen for decarburization sharply increases as the melt temperature increases and the oxygen ratio in blowing gas decreases. In oxygen refining of high carbon ferromanganese melt, it is not desirable to inject oxygen through bottom tuyères in an early stage of refining. When the melt temperature is low, the oxygen predominantly oxidizes the manganese in melt in spite of high carbon contents. The injection of oxygen/argon mixture gas is found to be an effective decarburization technique when the melt temperature is higher than 1500°C. 相似文献
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转炉生产中碳铬铁和中碳锰铁的技术研究与实践 总被引:1,自引:0,他引:1
初步研究了转炉吹氧法生产铁合金技术,并与传统的电硅热法进行了对比.通过在2.5 t转炉上进行试验,取得较好效果,达到了投资少、能耗低,并大幅度降低碳含量的效果. 相似文献
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介绍了高碳锰铁渣摇炼硅铁粉后热兑入炉生产低碳锰铁的工艺流程和操作技术要点,通过生产实践开拓了低碳锰铁合金生产的新工艺思路. 相似文献
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The Effect of Processing Parameters on Ferromanganese Alloy Carbon Content in Mamatwan Ore Reduction
Theresa Coetsee 《Mineral Processing and Extractive Metallurgy Review》2017,38(2):116-125
Industrial production of medium carbon ferromanganese is accomplished by decarburization of high carbon ferromanganese in an oxygen blown converter. In this study, the possible in situ refinement of high carbon ferromanganese was tested in carbon deficient mixtures of pre-reduced Mamatwan ore, coal char, and silica flux reacted at furnace temperatures of 1450°–1550°C. The resultant phase chemistry was analyzed and interpreted with the aid of thermochemical calculations. Production of carbon unsaturated ferromanganese alloy in the AlloyStream process is explained with reference to laboratory experimental results. 相似文献
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碳含量对真空烧结钼合金的影响 总被引:2,自引:0,他引:2
通过在真空烧结TZM合金中添加不同比例的碳元素,研究了碳元素在不同温度下真空烧结时与其他元素的作用及其反应机理。结果表明:(1)添加碳元素的量要与钼合金未烧结坯料中的氧元素成一定比例,才能同时保证有效降低氧含量和合金中碳元素处于适中范围。(2)从热力学反应生成自由能计算结果来看,在Mo-Ti-Zr-C四元烧结体系中钛锆优先与碳反应生成(Ti,Zr)C;部分碳元素先与Mo反应生成Mo2C,在有Ti、Zr元素存在时,Mo2C将会与Ti、Zr发生Mo2C+2Ti=2TiC+Mo方式的反应,生成金属Mo和(Ti,Zr)C。 相似文献
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《钢铁研究学报(英文版)》2014
Low and medium carbon ferromanganese produced by oxygen decarburization process and electric silicothermic process was briefly introduced, and the quality of products by these two processes was analyzed. Results showed that the total oxygen content in medium carbon ferromanganese by electric silicothermic process in China, which ranged from 0.039% to 0.171%, was between those of the common and refined products by oxygen decarburization process outside of China. The increments of total oxygen content in liquid steel were estimated when ferromanganese was added for the purpose of Mn element adjustment at the end of smelting. Refined low and medium carbon ferromanganese, which had low total oxygen content, was recommended for composition adjustment of clean steels during final stage of a heat. It is possible that the inclusions in the ferromanganese alloy greatly influenced the quality of clean steel indirectly by affecting the amount, size and composition of inclusions in steel. 相似文献
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中低碳锰铁中碳的来源和降碳途径 总被引:1,自引:0,他引:1
本文分析了中低碳锰铁中碳的主要来源,提出了降碳的两条主要途径,即提高硅锰合金的硅含量降碳和硅锰合金精炼降碳降磷.根据实验结果,提出了使用精炼的硅锰合金作还原剂,可以生产出低磷的优质锰铁合金,并提出了生产中低碳锰铁可以使用普通烧结矿. 相似文献