上海梅山钢铁股份有限公司干熄焦电气控制系统

上海梅山钢铁股份有限公司干熄焦项目为1、2。焦炉移地大修的配套项目。该项目包括新建l套140t／h干熄焦装置及1座6MW的背压式汽轮发电机电站。其相应的配套设施有提升机装置、CDQ工艺除尘及环境除尘地面站、除盐水站、循环水站等。该项目应用了国内外先进的工业自动化控制技术和变频调速传动技术,其电气控制系统在国内属于领先水平,实现了干熄焦操作的自动化控制。     

提高供氧强度对转炉冶炼的影响

转炉供氧强度大小的选择主要取决于它的喷溅情况,同时还应考虑原料状况、冶炼钢种、炉容比、转炉排烟能力等条件,通常在无喷溅的前提下应尽量使用较大的供氧强度。提高转炉供氧强度能缩短吹氧时间,增加钢产量,强化氧射流与熔池的作用,加快脱碳速度、成渣速度和熔池升温速度,减少氧气消耗,提高转炉炉龄。     

提高7m焦炉焦炭质量的研究

鉴于7m大型焦炉与其它焦炉在焦炭质量管理上存在一定的差别,从配煤系统管理、炉体结构、炼焦生产管理、热工管理以及干熄焦管理等几个方面对提高7m焦炉焦炭质量进行了实践性研究。指出7m焦炉的焦炭质量管理是一项复杂的系统工程,涉及指标多范围广,各项指标相互联系、相互制约,只有对整个工艺过程进行优化,才能整体提高焦炭的质量。     

Control of Non‐metallic Inclusions by Slag‐metal Reactions for High Strength Alloying Steels

A laboratory study was carried out to investigate non‐metallic inclusions in high strength alloying steel refined by high basicity slag. The results indicated that the inclusions were mainly of the CaO? MgO? Al₂O₃ system, Al₂O₃? MgO and MgO‐based inclusions. The steel/slag reaction time and Al₂O₃ content in slag had a great effect on inclusions characteristics. With the reaction time increasing from 30 to 180 minutes, inclusions experienced a transformation process: from mainly Al₂O₃? MgO system and MgO‐based inclusions to spherical CaO? MgO? Al₂O₃ system inclusions surrounded by a lower melting temperature surface layer of CaO? Al₂O₃. Formation and transformation mechanisms of the inclusions were given based on the results. It was also found that with Al₂O₃ content in slag reduced from 40% to 30%, [Mg] contents in steel melts were increased and MgO in slag reached saturation, which contributed to the formation of more MgO‐based inclusions and a more scattered inclusion composition distribution after 90 min reaction.     

Influence of Coating Granulation Process on Iron Ore Sinter Quality and Productivity

For better blast furnace performance, there has always been a need for better quality raw materials like sinter, lump ore, and pellets. Among these raw materials the usage of sinter in blast furnace is at higher side compared to other iron bearing materials. As the quality of sinter product improves, its usage in blast furnaces also increases. Iron ore fines are the main source for sinter making. To improve the sinter properties it is necessary to provide good quality of iron ore fines. Due to depletion of high grade iron ore resources, goethite and limonitic ore content in iron ore fines is expected to increase gradually. Usually limonitic and goethite ore are associated with higher alumina and LOI. The conventional sintering process is one of the well established processes for high quality hematite ore. It does not fully respond to the low grade iron ore associated with goethite and limonite. This has led to deterioration in sinter properties and productivity. In recent years the improvement in the quasi‐particle structure with the granulation process is an effective method for improving sinter quality and productivity. To improve the sinter quality and productivity for low grade iron ore fines, different granulation processes like the conventional one, and other two advanced granulation processes like coke breeze, and flux & coke breeze coating granulation were studied in detail by conducting laboratory pot grate sintering experiments. From the test results it was found that sinter productivity, physical and metallurgical properties of the sinter improved with flux & coke breeze coating granulation process compared to conventional and coke breeze coating granulation process. Proper selection of the granulation time is very important to achieve the desired sinter properties. In the present work detailed laboratory experiments have been carried out by varying the coating time from 30s to 110s to study the influence of flux & coke breeze coating granulation time on mineralogy, productivity, physical, and metallurgical properties of sinter. With a coating granulation time of 50s, higher productivity, higher yield, and stronger sinter (higher T.I) with lower RDI and ‐5mm size sinter were achieved.     

八钢矿渣微粉项目对促进我区工业CO2减排的分析

CO2减排是我国实现清洁化生产中长期规划中的一项重要内容。通过论述矿渣微粉是实现CO2减排的主要途径,指出八钢建设矿渣微粉项目,不仅能够有效地降低八钢工业固体废弃物的排放和环境污染问题,而且对新疆工业CO2减排具有重要意义。     

阳极炉中途造渣除杂质的生产实践

分析了生产合格阳极铜对铜电解精炼的重要性,通过加强阳极炉精炼造渣操作,提高阳极铜质量标准。     

铜炉渣的可磨性及综合回收性能的影响因素分析研究

本文论述了铜冶炼炉渣浮选回收铜的影响因素,并指出熔融炉渣冷却方式及冷却速度是影响铜冶炼炉渣浮选回收铜的主要因素。对白银有色集团公司铜冶炼厂的两种铜炉渣的可磨性及综合回收性能进行了对比,并分析了难以获得铁精矿的原因和含铁硅酸盐的形成过程,再次证明了熔融炉渣的冷却方式及冷却速度是影响炉渣浮选回收铜的主要因素。     

Study on non-metallic inclusions in Al killed high strength alloy steel refined by high basicity and high Al_2O_3 content slag

Laboratory and industrial studies were carried out to investigate non-metallic inclusions in high strength alloy steel refined by high basicity and high Al₂O₃ slag.It was found that the steel/slag reaction time largely affected non-metallic inclusions.With the reaction time increased from 30 min to 90 min in laboratory study,MgO-Al₂O₃ spinels were gradually changed into CaO-MgO-Al₂O₃ system inclusions surrounded by softer CaO-Al₂O₃ surface layers.By using high basicity slag which contained as much as 41%Al₂O₃ in the laboratory study,ratio of low melting temperature CaO-MgO-Al₂O₃ system inclusions was remarkably increased to above 80%.In the industrial experiment,during the secondary refining,the inclusions changed in order of "Al₂O₃→MgO-Al₂O₃→CaO-MgO-Al₂O₃".Through the LF and RH refining,most inclusions could be transferred to lower melting temperature CaO-Al₂O₃ and CaO-MgO-Al₂O₃ system inclusions.     

莱钢低硫钢冶炼过程硫含量控制实践

结合莱钢J55、L360等低硫钢冶炼的生产实践,分析了"铁水预脱硫处理—转炉—LF钢包精炼—连铸"全流程各工艺环节的硫含量控制技术,指出铁水预脱硫处理、转炉冶炼、LF精炼过程硫含量控制技术是低硫钢冶炼的关键技术环节。通过采用全流程硫含量控制技术,生产出了硫的质量分数最低为0.002%的低硫钢。