共查询到19条相似文献,搜索用时 187 毫秒
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转底炉(RHF)工艺是中国处置钢铁行业含锌粉尘的有效方式之一。目前,转底炉处理含锌尘泥生产中存在含碳球团粉化严重的问题,会对生产顺行与产品质量造成不利影响。因此,对原料预处理系统、压球成型系统、干燥系统、转底炉直接还原系统、金属化球团冷却系统等各个工序中含碳球团的粉化现象进行全面考察与解析。解析发现含碳球团粉化包括自然粉化与还原粉化,自然粉化的主要原因是炼钢尘泥中活性氧化钙(f-CaO)的消解不完全与含碳球团在干燥过程中水分表面气化和内部扩散速度的差异;还原粉化的主要原因在于低温(400~600℃)还原过程中含铁物相晶型转变与晶体体积变化。 相似文献
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因为环保和市场的需要,转底炉处理钢铁厂含铁尘泥及废弃物技术正在国内呈现出蓬勃的生命力。目前,国内已有多条转底炉直接还原生产线投入运行,转底炉技术能直接利用废弃粉尘中的碳还原氧化铁和氧化锌,金属化率达到70%,脱锌率达到80%,有效的解决了钢铁企业含锌粉尘的回收和利用。 相似文献
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采用转底炉直接还原工艺,将铜渣含碳球团在高温条件下直接还原得到金属化球团和高品位氧化锌粉尘,再通过熔分或磨矿磁选方式将铁回收,得到的铁产品可作为冶炼含铜钢的原料.转底炉中试结果表明:采用"转底炉直接还原—燃气熔分"流程处理铜渣,可获得TFe品位94%以上、铁回收率93%以上的熔分铁水;采用"转底炉直接还原—磨矿磁选"流程处理铜渣,可获得TFe品位90%以上、铁回收率85%以上的金属铁粉;采用两种流程处理铜渣,均可获得锌品位60.02%的ZnO粉尘.结果表明,经过转底炉直接还原,铜渣中的铁橄榄石Fe_2SiO_4和磁铁矿Fe_3O_4相转变为含有金属铁Fe、二氧化硅SiO_2和少量辉石相Ca(Fe,Mg)Si_2O_6的金属化球团,具备通过磨选或熔分进行进一步富集的条件. 相似文献
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针对转底炉生产存在产品金属化率低、冶炼能耗高、烟气含尘量大、生产效率低等问题.通过建立转底炉冶炼数学模型,计算了不同工艺参数对转底炉冶炼能耗的影响规律.结果表明:转底炉产品金属化率与烟气对含碳球团的二次氧化有关,增大还原区煤气供应量,可以减少含碳球团二次氧化,提高产品金属化率;助燃风预热温度和富氧率对冶炼能耗影响显著,提高助燃风预热温度和富氧率可以降低燃烧消耗,提高冶炼效率.助燃风预热温度每提高100℃,煤气消耗可以减少75 m3;助燃风富氧率达到20%时,煤气消耗量减少50%,烟气量减少57%. 相似文献
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转底炉生产金属化球团工业性试验 总被引:2,自引:2,他引:0
昆钢根据对各种非高炉炼铁工艺进行基础调研,并与北京科技大学合作进行了昆钢原料条件下转底炉生产金属化球团的实验室试验研究,找到了昆钢原料条件下转底炉的适宜操作参数。根据研究结果,决定利用山西瑞拓熔融还原炼铁有限公司的转底炉,进行生产金属化球团的工业性试验,试验取得了成功。 相似文献
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宝钢转底炉工艺技术发展 总被引:2,自引:0,他引:2
摘 要: 宝钢从2005年开始调研、研发转底炉工艺技术,2015年在宝钢湛江开始建设转底炉生产线,2016年宝钢转底炉投产。经过污泥烘干工艺、配料工艺、压球工艺以及转底炉操作等方面的改进,实现了转底炉工艺达产达标,宝钢转底炉工艺技术达到了国际一流水平。宝钢转底炉工艺有效脱除了含铁含锌尘泥中的锌、钾、钠、铅和氯等有害杂质,转底炉生产的直接还原铁(DRI)返回钢铁生产、产生的蒸汽返回生产蒸汽管网和生产的锌粉作为锌冶炼原料,实现了含铁含锌尘泥资源综合利用。宝钢还探索用转底炉处理红土镍矿等工艺,为转底炉的拓展应用作了有益的探索。 相似文献
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Yu-Liang Wu Ze-Yi Jiang Xin-Xin Zhang Qing-Guo Xue Ai-Bing Yu Yan-Song Shen 《Metallurgical and Materials Transactions B》2017,48(5):2403-2418
Metallurgical dusts can be recycled through direct reduction in rotary hearth furnaces (RHFs) via addition into carbon-based composite pellets. While iron in the dust is recycled, several heavy and alkali metal elements harmful for blast furnace operation, including Zn, Pb, K, and Na, can also be separated and then recycled. However, there is a lack of understanding on thermochemical behavior related to direct reduction in an industrial-scale RHF, especially removal behavior of Zn, Pb, K, and Na, leading to technical issues in industrial practice. In this work, an integrated model of the direct reduction process in an industrial-scale RHF is described. The integrated model includes three mathematical submodels and one physical model, specifically, a three-dimensional (3-D) CFD model of gas flow and heat transfer in an RHF chamber, a one-dimensional (1-D) CFD model of direct reduction inside a pellet, an energy/mass equilibrium model, and a reduction physical experiment using a Si-Mo furnace. The model is validated by comparing the simulation results with measurements in terms of furnace temperature, furnace pressure, and pellet indexes. The model is then used for describing in-furnace phenomena and pellet behavior in terms of heat transfer, direct reduction, and removal of a range of heavy and alkali metal elements under industrial-scale RHF conditions. The results show that the furnace temperature in the preheating section should be kept at a higher level in an industrial-scale RHF compared with that in a pilot-scale RHF. The removal rates of heavy and alkali metal elements inside the composite pellet are all faster than iron metallization, specifically in the order of Pb, Zn, K, and Na. 相似文献
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转炉污泥制作冷固球团的应用研究 总被引:9,自引:0,他引:9
介绍了转炉污泥冷固球团的制作工艺过程,选择在不同的试验条件下,对比压力、水分及粘结剂用量,分析了球团的冶金性能以及有关物理化学参数,将转炉污泥冷固球团应用到高炉冶炼工业性试验,结果表明:用冷固球团能代替原矿,消除了尘泥堆积污染,且为企业清洁生产、循环经济产生效益;提出了转炉污泥应用研究方面的相关结论。 相似文献
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基于转底炉工艺,结合FeO-SiO_2-CaO三元相图,对金属化球团的渣系进行理论分析,同时开展模拟实验,研究了含铁尘泥金属化球团合理渣系结构。结果表明,对于含铁尘泥球团,当二元碱度为0.37~0.67时,渣系熔点小于1 150℃,球团在较低的还原温度下即可形成液相;随着渣系碱度的逐渐降低,含铁尘泥金属化球团的抗压强度呈现先增大后降低的趋势,当球团碱度为0.61时,抗压强度达到最大;金属化球团的强度与反应温度呈正相关性,反应温度的提高可大幅提高球团的强度。当球团二元碱度为0.85时,反应温度由1190℃提高至1220℃,球团的抗压强度可提高近100%。但随着球团碱度逐渐降低,不同温度条件下球团抗压强度的差异逐渐减小。 相似文献
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The high-temperature tube furnace was applied to simulate the rotary hearth furnace (RHF) for the direct reduction of zinc-bearing dusts from steel plants. The removal mechanism of Zn, Pb and alkalis from cold bonded briquettes made by mixing metallurgical wastes, such as dust from bag house filter, OG sludge, fine converter ash and dust from the third electric field precipitator of the sinter strand, in various proportions was investigated. More than 70% of metallization rate, more than 95% of zinc removal rate, 80% of lead removal, as well as more than 80M of K and Na removal rates were achieved for the briquettes kept at 1473-1603 K for 15 min during the direct reduction process respectively. The soot generated in the direct reduction process was studied by chromatography, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results suggested that the main phases of the soot were ZnO, KC1, NaC1 and 4ZnO · ZnC12 · 5H20. Furthermore, the content of Zn reached 64.2 %, which could be used as secondary resources for zinc making. It was concluded that KC1 and NaC1 in secondary dust resulted from the volatilization from the briquettes, whilst ZnO and PbO were produced by the oxidation of Zn or lead vapour from briquettes by direct reduction. 相似文献