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隆飞亮 《金属材料与冶金工程》1999,(2):11-13,17
根据湘钢烧结矿冶金性能较好,但低湿还原粉化性较差的情况,进行了降低烧结矿低温还原粉化率的实验室试验与工业性生产试验,结果表明:烧结矿中次生Fe2O3含量高、内裂纹多是导致其低温还原粉化性恶化的主要原因,要降低还原粉化率,烧结矿中FeO含量应控制在7.8% ̄8.8%,Mg含量应控制在3.5% ̄4.5%,并保证混匀料的质量,将中和料层高度控制在8m以上。 相似文献
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Kamataka粉矿是印度国家矿业发展公司生产的一种富矿粉。主要是对Kamataka粉矿进行物相分析及烧结性能的研究,并与武钢使用的其它进口粉矿进行了比较,同时通过试验还找出了使用该矿的适宜工艺参数。 相似文献
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以二元碱度为变量,通过调整配矿方案,研究了不同碱度下,烧结矿的显微组织及低温还原粉化指数的变化。结果表明,随着烧结矿碱度的增加,其低温还原粉化指数先升高后降低;当碱度为1.79~2.18时,烧结矿的物相组成为单一且性能良好的针状铁酸钙,低温还原粉化指数RDI_(+3.15)较高。实际生产中,可按此碱度范围进行配矿。 相似文献
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The reduction degradation characteristics of typical sinter, pellet and lump ore were tested with the reducing gas conditions simulating two kinds of iron-making processes. The results show that, in the same condition of gas composition and temperature, the reduction degradation degree (RDI<3.15 mm) of sinter is high, RDI<3.15 mm of lump ore is low and RDI<3.15 mm of pellet is in the middle level. With two kinds of gas composition simulating different iron-making processes, the reduction degradation indices (RDI) of three kinds of iron ores all present the tendency of “inverted V-shape” in the temperature range from 450 to 650 ℃, and the RDI reach the maximum value at 550 ℃. The reduction degradation degrees of iron ores are extended when mixing the gas with hydrogen to increase the reduction potential, and the influence extent is discrepant for different iron ores. Colligating the increase amplitude of grains in small size fraction, the influence of reducing gas on lump ore is the greatest, the influence on sinter is the second, and the sensitivity of pellet on the reducing gas properties change is relatively small. As for the degradation form, lump ore and sinter both present the degradation of cracking, and the distribution of small grains generated from the cracking is in the range from 0.5 to 6.3 mm uniformly. The lump ore presents surface cracking, while sinter presents integral cracking. The pellet presents the degradation of surface stripping, and the proportion of grains smaller than 0.5 mm is the highest, which is up to 90% in the grains smaller than 3.15 mm. 相似文献
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Abstract: Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases emission. However, the effect of hydrogen addition on the low temperature metallurgical property of sinter is still unclear. A detailed investigation was performed on the above topic. The results are as follows. When CO is partially replaced by H2, the RDI<315 (RDI<28) of sinter decreases with the increase of the H2 content; when the content of H2 increases, the CO, CO2 and N2 decrease proportionally, in this case, RDI<315 (RDI<28) of sinter increases with the increase of H2 content; the value of RDI<315 (RDI<28) basically depends on the reduction index (Ri).The experimental data of RDI<28 based on Japanese industrial standard (JIS) are a little higher than the data of RDI<315 based on Chinese industrial standard (CIS) in the same condition. In addition, for part of CO is replaced by H2: RDI<28=338394+11585 RDI<315; for other gases, except H2, are decreased proportionally: RDI<28=1739678+042922 RDI<315. 相似文献
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随着太钢450 m2烧结机投产,配矿结构中进口矿粉比例大增,烧结矿低温还原粉化率升高.为了保高炉精料,进行了烧结矿喷洒CaCl2溶液的试验研究并加以实施,烧结矿低温还原粉化率平均降低4 %~6 %,取得了比较明显的效果. 相似文献
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国内某厂生产的低钛烧结矿可用于2 500 m3高炉冶炼,强度指标达到普通烧结矿水平,但其低温还原粉化率仍比普通烧结矿高40%以上,还原粉化机理尚不明确。通过分段测试低钛烧结矿的还原粉化率并进行矿相分析,结果发现:低钛烧结矿中的赤铁矿-气孔结构是产生裂纹的源头,铁酸钙熔蚀结构是主要粘结相,但此结构中有许多细小裂纹,裂纹沿程存在许多赤铁矿晶粒,其还原速率较快且易形成交叉网状裂纹,使粘结相结构受到严重破坏,致使烧结矿还原粉化性能差。 相似文献
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提出了基于低温快速预还原的熔融还原炼铁流程。由三部分组成:熔融气化炉,主要功能是熔化海绵铁和产生预还原所需的还原煤气;预还原部分,由两级快速循环床和一级矿粉预热床组成,主要功能是将矿粉转变成高金属化率的铁粉,金属化率大于85%;煤气处理,包括尾气换热、煤气洗涤、煤气增压、脱除CO2等工序,功能是调节预还原所需的煤气成分、煤气量与温度。新工艺采用精矿粉或粒度小于1 mm的矿粉,具有还原温度低、反应接近平衡态、金属化率高等特点,吨铁燃料比有望在600 kg左右,实现炼铁工艺的高效、节能与减排。 相似文献
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氯化物对烧结矿RDI影响的试验研究 总被引:2,自引:0,他引:2
介绍了在烧结矿表面喷洒CaCl2等稀溶液以降低宝钢烧结矿RDI指数的实验室试验研究,以及在烧结混合料中添加少量CaCl2烧结的试验研究结果。 相似文献