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选好焦炭平均粒度降低75%硅铁电耗 总被引:1,自引:1,他引:0
本文分析了焦炭粒度变化的原因,论术了焦炭粒度对硅铁生产的影响,提高出了控制焦炭平均粒度的方法,使75%硅铁生产稳定,单位电耗降到8300-8000kWh/t。 相似文献
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采用“电导池”法测量铁合金混合炉料的电阻,利用Ergun公式计算炉料的空隙率,用于评价炉料的透气性。实验表明,混合炉料中焦炭体积大于矿石体积(如硅铁冶炼,V焦/V矿〉1)时,固定矿石粒度调整焦炭的情况下。炉料电阻随炉料平均粒度的增加而减小,而透气性随炉料平均粒度增加而增加;固定焦炭粒度调整矿石的情况下,炉料电阻随炉料平均粒度增加而增加,而透气性随炉料平均粒度增加而减小。当混合炉料中焦炭体积小于矿石体积(如锰硅合金冶炼,V焦/V矿〈1)时,固定焦炭粒度改变矿石粒度调整炉料粒度,炉料的电阻随炉料平均粒度增加而减小,而炉料透气性随炉料平均粒度增加呈非线性变化规律。 相似文献
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一、前言我厂1800KVA电炉生产的75硅铁含铝一般在1.9—2.7%之间,大部分产品不符合出口硅铁的质量要求(Al<2%)。硅铁中的铝,大多来自焦炭。据计算,我厂每炼一吨75硅铁,由焦炭带入的铝约27.5公斤,占带入总量的82%,由硅石带入的铝约6公斤,占带入总量的18%。脱铝前,硅铁 相似文献
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冶炼硅铁时,焦炭经过破碎筛分将产生25%左右的粉末。如何提高焦炭的利用率,搞好资源的综合利用,成为原料工业,尤其是冶金工业界研究的一个重大课题。我们进行了焦粉团球的研制和试验,其强度和化学性能均可满足冶炼技术要求,完全可以作为冶炼硅铁的还原剂。这种“类焦粒”还原剂的研制成功,为提高焦炭的利用率开辟了新的途径.对我国能源的开发和资源的综合利用有着重要的意义。 相似文献
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在苏联建设新的强大的电站和投入生产之后,就可用电炉代替高炉生产低硅铁,因为电炉生产的经济效果最好。生产高炉硅铁的主要费用取决于所消耗的焦炭价格。焦炭费用占产品成本的比重,各工厂不一。例如,齐略宾斯克冶金工厂焦炭费用占硅铁成本的52%左右,斯大林冶金工厂占70%左右,下塔吉尔冶金联合企业占65%(1955年)。电热法生产18%硅铁时电能和焦炭的费用亦占整个成本的45%左右。由于燃料消耗占合金成本的比重很高,因此上述两种方法的经济效果在很大程度上视还原一吨硅所需的热消耗而定。为便于计算上的比较起见,本文以1958年齐略宾斯克冶金工厂和库茨涅佐夫铁合金广,熔炼炼钢生铁和硅铁的最佳指标为 相似文献
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目前国内冶炼硅铁的还原剂,在多为焦炭,但因我国焦煤贮量较少,焦炭供应紧张,为开辟75硅铁还原剂的新途径,我厂于1983年探索以煤代焦的冶炼工艺。一、以煤代焦的可行性众所周知,炭素还原剂的物理化学性质,对硅铁冶炼的各项技术经济指标影响颇大。获取质优、价廉的理想的还原剂,一直是人们努力的方向。某些资料指出: 相似文献
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在对鞍钢焦炭质量现状进行科学分析的基础上,研究了焦炭强度、热态性能、化学组成、粒度及质量波动等对高炉冶炼的影响规律,并通过对高炉风口焦炭的实际取样与研究加以验证,指导高炉操作实践;同时,系统地掌握焦炭质量、焦炭质量对高炉冶炼的影响、焦炭质量的评价方法等;尤其是利用“风口取样”,掌握焦炭在炉内的变化规律和炉缸工作状况,为高炉操作提供技术支持,同时为焦化厂低成本生产出符合高炉运行要求的焦炭提供了依据。 相似文献
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为研究某铁合金公司使用新购焦炭后炉况恶化的原因,采用焦炭工业分析、常规粒度分析、XRD分析以及焦炭的热反应性能分析等测试方法对比研究了新购焦炭与正常焦炭的成分、粒度分布、微晶结构、反应性及反应后强度的差异,进而研究了新购焦炭导致矿热炉冶炼行为异常的具体原因。结果表明,新购焦炭灰分较高、电阻率偏低导致冶炼时混合料电阻降低,炉内热量不足。同时,新购焦炭初始粒度小、反应后强度低导致冶炼过程中对埋入电极的升降产生阻碍。此外,新购焦炭在冶炼时还会带入更多的杂质元素,导致出炉的铁合金质量下降。 相似文献
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为了解炉内渣铁分布以及径向焦炭性能劣化状况,对朝阳钢铁公司1号高炉取样设备组成、现场安装以及风口内部径向取样过程进行了说明。对所取风口焦的成分、粒度组成、热态性能等进行检测,并对所取不同部位风口焦微观结构及石墨化程度进行分析,结果表明,1号高炉风口回旋区长度为1.7 m,风口焦平均粒度为16.12 mm,热态反应后强度为12.30%。对比鞍钢本部其他在产高炉,明显存在着回旋区长度偏短、风口焦粒度较小及热态性能较差等问题,焦炭性能较差是影响高炉稳定顺行的重要原因之一。 相似文献
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《钢铁冶炼》2013,40(3):222-229
AbstractTwo measures for coke saving and increase in blast furnace efficiency related to coke characteristics – reactivity and size – are discussed in this paper. Modern blast furnace operation with low coke rate and high injection rate causes a change in coke quality requirements. A discussion has arisen recently about highly reactive coke. Here, a theoretical analysis of influence of coke reactivity on the thermal reserve zone, direct reduction and carbon consumption in the blast furnace has been undertaken. Experiments have been performed using non-standard test scenarios that simulate coke behaviour under real blast furnace operating conditions. Coke reactivity and microstructure have also been investigated under the impact of alkali and pulverised coal ash and char. Operation of many blast furnaces has proved the possibility of coke saving and increase in productivity when using small-sized coke (so-called nut coke) mixed with the burden, but the reasons for this phenomenon, and consequently the limit for nut coke consumption, are still not very clear. An analytical method and cold model simulations have been used to quantify the change in shaft permeability and furnace productivity when using nut coke. 相似文献
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Coke is used as a reducing agent in the production of ferrochromium in a submerged arc furnace (SAF). Its good electrical conductivity compared to other input materials makes it a dominant current conductivity substance in the burden. The resistance of the coke has to be high enough to ensure the proper functionality of the furnace. Used cokes for submerged arc furnace production are relatively small in size compared to e.g blast furnace (BF) cokes. A common practice is to use screening residual coke, which is too small for the BF, in SAF. The goal of this study was to show differences in the electrical properties of screening residual cokes compared to coke formed in different parts of the coke battery, in dependence of particle size. The resistances of different cokes were measured and XRD measurements were performed to define the crystallographic structure of the selected cokes. The results indicate that small coke particles have higher overall resistance, which is due to their internal properties. This small weakly carbonized coke is formed in the middle of the coking battery and is subject to changes in varying coking practices. Continuous quality control of screening residual coke is needed to use it in the SAF. 相似文献
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通过对高炉风口取样装置取出的焦炭的粒度、热性能、灰成份、碱金属含量的分析研究,分析结果表明,攀钢高炉风口回旋区长度约为2m,高炉风口回旋区沿径向上,焦炭灰分、碱金属、热性能都先变小后变大。随着喷煤量的增大,风口焦的平均粒度变小,回旋区缩短。 相似文献
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Reasonable control on CRI (coke reaction index) is one of the key factors for BF (blast furnace) low-carbon smelting. However, there are contrary opinions. One is increasing CRI to improve reaction efficiency in BF and the other is decreasing CRI to suppress coke degradation in furnace. Different methods are adopted to realize effective catalysis (increasing CRI) and passivation (decreasing CRI) of coke. Simulation tests of coke in BF lumpy zone under gradual temperature rising have been done. Effect of CRI on gas composition, ore reduction, burden column permeability and heat reserve zone′s temperature under non-isothermal condition are studied. Then combined with iron making calculations, a novel BF operation suggestion is proposed as coke nut with small size be catalyzed and mixed with ore while skeletal coke with large size be passivated and separately charged into BF. 相似文献