共查询到20条相似文献,搜索用时 156 毫秒
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根据新余钢铁集团公司第二炼钢厂的精炼渣循环利用数据,分析了热态精炼渣补加石灰后脱硫的效果。研究结果表明熔渣碱度为2~3的热态精炼废渣仍具有一定的硫容量,通过补加一定量的石灰可提高其脱硫能力。现场试验表明,向熔渣碱度为2~3的热态精炼渣中补加3~4kg/t的石灰,并加一定量的萤石,脱硫率达到80%以上;并对循环利用的精炼渣进行XRD及EDS物相分析,利用矿相显微镜查看循环利用后的渣的形貌变化,通过分析发现循环利用两次的热态渣岩相种类基本不变,主要为C2S、C3S、C2A、CA,但随着循环次数的增加,钙铝酸盐增多,熔渣混合状况得到改善。热态精炼渣的循环使用的意义不仅在于节约了成本而且降低了对环境污染的危害。 相似文献
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介绍120t转炉精炼钢水钢包顶渣重复使用工业试验。试验结果表明:精炼钢水钢包顶渣重复使用可改进LF精炼工艺,冶金效果有一定的改善,节能减排,可降低生产成本约10元/吨。 相似文献
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介绍了LF精炼热态渣在转炉炼钢厂的循环应用情况,分析对比精炼渣循环利用前后电极消耗、电量消耗、辅料消耗、脱硫能力、钢水回收量等生产数据后表明,精炼渣循环利用后的钢水回收量比原工艺多了1.175t/炉,电极消耗降低0.08kg/t,电耗降低7.7kW·h/t,石灰降低6.12kg/t,萤石降低1.65kg/t,同时促进了精炼快速成渣,缩短了精炼处理周期,保证了精炼钢水的质量。 相似文献
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对LF炉热态渣料循环利用后脱硫效果展开试验,试验过程分循环渣中添加石灰和不添加石灰两部分进行。通过比较渣料循环后LF精炼出站钢水中硫的质量分数,取终渣样进行化学分析及计算硫容量和硫分配比,做出了对渣料循环脱硫效果的综合判断。 相似文献
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Steel refining is a complex phenomenon which depends on numerous variables, so, a kinetic approach is necessary for precise understanding of the refining process. In this study, based on a previously proposed model for hot metal dephosphorization, a new simulation model for the steel refining process in BOF is presented. In most cases, steelmaking slag is saturated with dicalcium‐silicate (C2S) and it is well known that C2S forms solid solution with tricalcium‐phosphate (C3P) in a wide composition range and the partition ratio of phosphorus between C2S and liquid slag is large. On the other hand, C2S formed around the lime surface is known as a barrier to lime dissolution into liquid slag. In this simulation model not only the effect of solid phase in slag is considered but also the effects of temperature dependence of variables as well as top and bottom blowing and scrap melting are taken into account. The calculation results are compared with industrial data and the good agreement between experimental and simulation results evidence the validity of this kinetic approach to steel refining process in BOF. Moreover, by using this model the influence of various parameters on the reaction efficiency is discussed. 相似文献
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低锰钢一般要求控制转炉终点[Mn]≤0.05%,针对传统双渣工艺熔剂消耗成本高,留渣双渣工艺去锰不稳定的问题,基于热力学、动力学分析和现场数据分析,研究了碱度炉渣(R 1.68~2.00)、温度(1340~1460℃)及渣中FeO含量(FeO)(15.5%~18.7%)对留渣双渣工艺中炉渣去锰能力的影响。通过溅渣留渣期间加入部分石灰石,吹炼开始加入少量生白云石替代部分轻烧白云石和加入少量萤石以及吹炼初期采用较高枪位,加强熔池上层炉渣搅拌加速初期锰的氧化等措施,使终点[Mn]由≤0.06%降至≤0.045%,与传统双渣法比较,减少石灰用量6.5 kg/t,减少萤石1.48 kg/t,铁皮单耗降低6.42 kg/t,明显降低冶炼熔剂成本。 相似文献
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A comprehensive numerical model is developed simulating the batch process of liquid steel desulphurisation. Special emphasis is placed on the exact figuring of real process engineering conditions. The model includes time dependent intensive parameters such as the aluminium content and the oxygen content of the liquid steel as well as the temporal course of the CaO-, CaS, Al2O3-component activities in the refining top slag. Mass transfer coefficients are derived from practical experience. The computations prove the outstanding influence of the stirring intensity on the rate of the refining reaction. Its progress is delayed by the dissolution of the lime charge at the beginning of the stirring treatment. The simulation model can also be applied to optimize the desulphurisation process with respect to stirring time, state of deoxidation and amount of refining slag. 相似文献
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为降低AOD精炼的渣料和还原剂硅铁用量,对高铬钢液脱碳及还原过程渣碱度控制进行热力学分析,并进行45 t AOD冶炼304不锈钢造渣工艺试验。试生产结果表明,降低AOD精炼304不锈钢脱碳期炉渣碱度可减少钢水铬的氧化,同时有效减少AOD精炼渣料和还原剂消耗;AOD精炼过程石灰加入量平均从104.2 kg/t降至84.2~93.1 kg/t时,脱碳期炉渣碱度由平均13.44降低到10.64,AOD冶炼过程石灰、萤石、硅铁单耗分别平均降低14.7、5.4、4.4 kg/t,钢中Cr收得率、Ni收得率和硫含量分别为99.0%、98.3%和0.0025%。 相似文献
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LF热态渣的循环利用可减少废渣排放,降低对环境的危害。对LF热态循环渣的脱硫能力及可回收性进行了分析,热态循环渣返回LF炉和转炉参与冶金反应后,可大幅降低渣料消耗,LF炉每罐回收热态循环渣1~1.5 t,平均节省石灰及其他助溶剂用量5 kg/t(钢),转炉每罐回收热态循环渣3~5 t,渣料消耗平均降低10~15 kg/t(钢)。采用热态循环渣配加石灰的LF炉造渣制度后,在相同的处理时间内,处理终点钢水中硫质量分数与常规处理几乎相同,同时节省了能源消耗,但必须考虑对钢水增硅、增锰的影响。热态循环渣返回转炉后导致入炉铁水温度低及吹炼过程渣量较大,因此转炉吹炼全程以低枪位操作更为适宜。在不影响生产组织的情况下,热态渣以返回转炉循环利用为最佳途径。 相似文献
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A high‐temperature thermodynamics model has been coupled with a fundamental mathematical model describing the fluid flow, where boundary conditions were chosen based on data for an industrial AOD converter. Using this model, the effect of both slag phases (a liquid part and a solid part) on the decarburization was studied. More specifically, the separation of chromium oxide to liquid slag as well as the effect of the amount of rigid top slag (solid)on the decarburization was investigated. The liquid slag was considered with respect to the uptake of chromium oxide, while the rigid top slag was only considered with respect to the increase of the metallostatic pressure in the steel melt. The results suggest that separation of chromium oxide to liquid slag results in a decreased decarburization rate. The same conclusion can be drawn with respect to the amount of solid top slag. 相似文献
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