共查询到19条相似文献,搜索用时 62 毫秒
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目前钢铁冶金企业在转炉炼钢工序中大多采用干法除尘系统,每生产1 t钢约产生8~20 kg转炉除尘灰,主要成分为TFe、CaO、C、SiO2、S、P等,粒度平均在120μm左右,堆密度为0.8 g/cm3~1.0 g/cm3。因转炉除尘灰中含有K、Na、Zn等元素,无法直接在烧结和高炉冶炼工序使用。建设转炉除尘灰冷压块生产线,对除尘灰进行消解、配加氧化铁皮、粘结剂,强力混合,再冷压成型生产出除尘灰冷压块,烘干后返转炉炼钢使用,作为冷却剂和造渣剂,回收铁、钙等元素,降低金属料消耗和石灰用量,实现了转炉除尘灰内部循环利用,有效降低了除尘灰外排处置成本和厂区堆积的环保风险。 相似文献
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回收利用攀成钢炼钢过程产生的污泥副产品用于转炉造渣,通过改善转炉过程的化渣条件,实现了炼钢副产品的有效循环。 相似文献
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介绍了长钢烧结厂不同时期烧结除尘灰循环使用的特点及状况.通过不断探索和改进,该厂最终找到了适合本企业特点的使用方法,彻底消除了长期以来除尘灰配加不均匀对混合料水分及烧结操作稳定的影响,取得了增产、减排、降耗的良好效果. 相似文献
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论述了转炉煤气干法除尘灰的产生及理化性质,并介绍了转炉干法除尘灰回收利用的工艺流程及应用实践情况。实践表明,采用炼钢干法除尘灰,配加少量锰矿和石英砂以及黏结剂制备的XG型复合造渣剂,作为转炉造渣剂用于炼钢;采用炼钢干法除尘灰,配加筛焦除尘灰以及黏结剂制备的铁碳复合球团用于炼钢,具有可观的经济效益、社会效益和环境效益。 相似文献
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本文介绍了一钢厂电炉用除尘镁铁球团的研制及其在电炉造渣中的应用,对原本废弃不用的除尘红灰进行回收再利用,制成性能良好的电炉造渣原料“镁铁球”加入炉中参与冶炼。在电炉冶炼前期氧化大幅脱磷时期,随冷料一起配人的镁铁球,可在熔化前期快速成渣,达到低温大幅脱磷的效果,从而保证在氧化期自如地控制电炉终点碳,并大幅去除钢中有害夹杂物,净化钢液。 相似文献
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介绍了转炉LT干法除尘系统及LT除尘灰的成分和特性。莱钢除尘灰利用有长流程和短流程两种方案,除尘灰被加工成金属副产品、回转窑精粉和除尘灰压球。使用除尘灰压球替代烧结矿用于转炉冶炼,取得很好的脱硫、脱磷效果,并且吨钢降低成本6.02元,实现了干法除尘灰全部回收利用,减轻了环境污染。 相似文献
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WU Wei MENG Hua-dong LIU Liu YUAN Tian-xiang BAI Yan-jiang YAN Zhan-hui 《钢铁研究学报(英文版)》2012,19(7):20-25
The slag melting characteristic of slag forming and slag splashing for 300 t BOF less slag process is researched by combining the methods of the slag chemical composition, the melting point determination and the petrographic analysis. The results show that the melting point of final slag for less slag smelting is 20 ℃ lower than that for conventional smelting. According to results of the petrographic analysis, the C3S (3CaO·SiO2) and C2S (2CaO·SiO2) content for less slag smelting are lower than those for conventional smelting, while the RO (FeO, MgO, MnO, etc) phase and C4AF (4CaO·Al2O3·Fe2O3) phase are higher than those for conventional smelting. According to results of the chemical analysis, the (CaO) content and slag basicity for less slag smelting are higher than those for conventional smelting, while (FeO) and (MgO) content in slag for less slag smelting are almost equal to those for conventional smelting. The reason why slag melting point for less slag smelting is lower than that for conventional smelting is that the quantity of added fluorite for less slag smelting is more than that for conventional smelting. According to the analysis results the slag melting point is determined by the C3S, C2S, RO phase and C4AF content. According to the results of slag melting characteristic before and after slag splashing for less slag smelting, the present adjusting slag process has little effect. It is important to adjust the composition of BOF final slag. The (FeO) content in slag is to be reduced at the slag splashing and adjusting slag process for less slag smelting. 相似文献
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Slags from metallurgical processes are widely used in different fields of application, e.g. in the building industry and as fertilisers. Nevertheless, also these by‐products have to be improved to ensure their sustainable use. The treatment of liquid slags, e.g. by changing their composition outside of the steel production process, will lead to interesting new properties of the newly formed products and thus guarantee their use in the future. Moreover, dust and sludges from off‐gas cleaning of metallurgical processes are becoming promising resource for coating and alloying elements. The very important element Zn for surface coating is enriched in the dusts, due to the recycling of Zn coated scrap. On the other hand, Zn might run short in the future, so that recovering of Zn from dusts and sludges may become necessary. To improve the efficiency of Zn recovery a dust re‐cycling process has been developed for EAF steelmaking by FEhS‐Institute. Some interesting side effects are supported by the dust recycling. It has been proved that the slag foaming can be enhanced by dust recycling, even for stainless steelmaking processes. Finally it can be shown that recovery of valuable elements from residues of iron and steelmaking is becoming more and more important. New developed processes are ready to be implemented into the daily steelmaking practise. 相似文献
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在实验室中研究了电炉粉尘和煤粉加入量及温度对泡沫渣高度的影响.结果表明,在电炉渣中加入0~30%的电炉粉尘和3%~12%的煤粉(质量分数)时,随粉尘及煤粉加人量的增加以及温度的提高,泡沫渣的最大发泡高度增加;在加入电炉粉尘造泡沫渣过程中,随温度升高,渣中ZnO的还原挥发速度加快,反应6 min,Zn的挥发率大于97%.在本实验条件下,反应3min,渣中Pb小于0.02%,温度对PbO的还原挥发速度无明显影响. 相似文献
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顶吹氧平炉炼钢熔炼过程中造渣是重要的,由于平炉炼钢供氧强度大,一氧化碳反应激烈,钢液降碳快,熔炼时间短等,给造渣带来困难。采用新型熔剂--钛渣作造渣剂,可以解决这个问题,经过三年多的试验研究,取得了大量的数据,结果使用钛渣作造渣剂,可以 降低熔渣熔点,改善熔渣流动性,降低铁料消耗,提高炉底寿命。 相似文献
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