铁水预处理脱磷剂的实验研究

本文从脱磷反应的热力学及动力学条件出发,在实验室的条件下,以CaO-Fe2O3-CaF2为脱磷剂的主要研究渣系,对不同配比关系的固体合成脱磷剂及预熔脱磷剂进行脱磷实验研究,得出适合铁水预处理的最佳配比关系的脱磷剂;在此基础之上,考虑用转炉渣、精细铁矿和烧结矿粉来代替脱磷剂中部分氧化剂和固定剂进行脱磷实验,确定其最佳配比关系。     

铁水预处理脱硫剂的选择

对一些常用脱硫剂作热力学、动力学分析，根据脱硫剂的特点和经济效果等多方面的比较，认为采用Mg系复合脱硫剂较为理想。     

KR法铁水预处理设备设计改进

本文是对武钢原KR法铁水预处理设备进行分析的基础上提出设备改进措施。为增加搅拌系统设备和除尘系统设备运行的可靠性,对升降小车和除尘烟罩结构进行了改良设计。昆钢现场生产情况表明,改进后节约了设备投资成本,增加了设备运行可靠性和稳定性,改良了生产工艺。     

铁水预处理生产线配套设备——铁水包倾翻车

为了节约能源、节省空间和缩短工艺流程,近代钢铁冶炼工艺过程中铁水常常在铁水包中完成铁水预处理—脱硫、脱磷等并调解铁水成分等工艺,脱硫后的脱硫渣浮在铁水液面的上层,脱硫渣需要从铁水包内去除。铁水包倾翻车(俗称脱硫扒渣车)是一种新型的、服务于铁水预处理生产线的运输设备,用于运送热态铁水并配合扒渣机进行铁水脱磷、脱硫处理后的扒渣。文章简要介绍了铁水包倾翻车的使用工位、主要功能、发展背景等,并主要介绍了秦皇岛冶金机械有限公司设计、生产的各种铁水包倾翻车的主要结构特点和设计手段。     

铁水脱磷预处理工艺的发展

简述铁水脱磷工艺的发展情况,着重介绍近年转炉进行铁水脱磷预处理的趋势及其特点。     

铁水预处理喷粉枪生产实践

在铁水预处理中,喷粉枪是铁水脱硫过程中粉剂运输的主要耐材之一。脱硫粉剂与钝化镁粉按比例通过喷粉枪在铁水罐内进行脱硫处理,提高喷粉枪寿命,可稳定铁水脱硫工艺顺行,降低铁水脱硫成本。本文针对铁水预处理喷粉枪使用特点,通过大量现场生产实际数据对铁水预处理喷粉枪实际应用进行分析,明确喷粉枪损坏原因及易损部位,从验收到使用,详细阐述了合理使用预处理喷粉枪的具体措施,动态掌握铁水预处理喷粉枪在实践中应用,取得良好效果,最终达到指导实际生产,降低铁水预处理成本、稳定生产运行的目的。     

搅拌法铁水预处理设备与工艺结合探讨

本文介绍铁水预处理在冶金工业中的重要作用,重点讨论设备的设计,制造的合理性、实用性、可靠性、稳定性、经济性、现场调试的可行性及设备与工艺合理结合时,如何满足工艺要求等.为冶金企业如何提高铁水的质量,增加钢板在市场上的竞争力,提供重要的参考信息.     

铁水预处理喷枪用耐火浇注料的研究与发展

通过对国内外喷枪耐火浇注料研究与应用过程的综述,提出了喷枪耐火浇注料力学性能、热震稳定性能、抗渣性能、烧后线变化等方面的技术要求,指出了低膨胀系数与低弹性模量的喷枪耐火浇注料发展方向。     

“首流”铁水对铸件气孔的影响及解决措施

通过实例探讨了浇注时首股铁水流进入型腔后，在远离直浇道的底面和侧面产生气孔的原因。认为这类气孔与型砂种类无关，仅与首流铁水质量及浇注系统的设置有关，通过改进浇注系统和提高铁水质量可消除这类气孔     

铁水脱硫站设备的整改

针对宣钢炼钢厂铁水预处理站在使用过程中存在的设备问题,及由于使用时间短、对工艺参数还处在摸索中,从而影响了脱硫作业问题。通过对设备的改造、分析及工业试验,取得了较好的生产效果和经济效益。     

冲件预断槽折断不良原因分析与解决措施

介绍了级进模中预断槽的设计意义,分析了冲件折断不良产生的原因,分别从几个方面提出了改进措施,并对预断槽设计进行了标准化,对同类模具设计具有指导意义。     

中碳低硅铝镇静钢连铸浸入式水口堵塞的原因分析及解决措施

结合浸入式水口堵塞物的分析,从钢水成分、顶渣、温度、精炼工艺、喂钙、连铸吹氩等多个方面,研究了中碳低硅铝镇静钢3种不同精炼工艺连铸浸入式水口堵塞成因。确定浸入式水口堵塞的主要原因有：水口吹气流量低不利于防止水口堵塞,顶渣氧化性强,加Al和上浮控制操作不规范,钙处理变性效果差,塞棒、板间、水口吹氩压力低。提出了适用于工业化生产的技术措施,工艺过程控制参数优化后,连浇炉数达到12炉以上。     

Chromosiliciding in molten salts to improve the cavitation resistance of cast iron

Conclusions Chromosiliciding in molten salts is recommended for protecting cast iron and steel parts against cavitation erosion.Dagestan Polytechnic Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 17–18, March, 1980.     

Chromium distribution between liquid iron and molten basic slags

An equilibrium study was made of the distribution of chromium and oxygen between liquid iron, containing less than 1 pct Cr, and simple slags of the CaO(MgO)-SiO₂-FeO-Cr₂O₃ type in the temperature range 1526° to 1734°C The effects of slag oxidation, temperature, and basicity were observed.     

Wetting between molten iron and prereduced ilmenite with carbon

An interfacial study between molten iron and the prereduced ilmenite with carbon was conducted at different melting temperatures by the sessile droplet method. The wetting characteristics between molten iron and the prereduced ilmenites with carbon were investigated by measuring contact angle of the droplet of molten iron on the prereduced ilmenite substrate. The images of the interface were also examined by the optical microscope and SEM equipped with EDS. The volume of molten iron increased with the melting temperature increasing when titania or high-content titania slag was used as the substrate. The contact angle decreased with the melting temperature increasing and it was independent on time at constant temperature. The contact angle was positively correlated with the reduction degree of the ilmenite, but the work of adhesion was negatively correlated with it. Higher smelting temperature was beneficial to the separation of iron and Ti oxides. The permeability of molten iron into the prereduced ilmenite with carbon was more obvious with reduction degree increasing owing to the high porosity of prereduced ilmenite.     

单吹颗粒镁铁水深脱硫工艺实践

本文阐述了唐钢单吹颗粒镁脱硫的工艺设备特点,并针对铁水脱硫预处理的现状进行了工艺优化,在此基础上,提出了深脱硫的具体措施。     

铝箔针孔产生原因及预防措施

简要介绍了铝箔针孔的类型及其微观组织特征,详细分析了铝箔针孔在各工序产生的原因机制,并提出了切实可行的预防措施及生产各工序中的有效控制针孔的方法,可供生产铝箔过程中避免针孔超标之参考。     

Removal of manganese from molten cast iron using potassium sulphide

Small melts of Fe-C-Mn (1.5%) alloy were treated with up to 20 wt% of potassium sulphide to assess its effect on the removal of manganese. The manganese and sulphur contents were determined on chill-cast samples, whilst microscopic observation and electroprobe X-ray microanalysis (XMA) procedures were used to analyse the reaction products. It was found that up to 80% of the original Mn content was removed by an addition of 7.5 wt% of K₂S; the rate of removal from molten iron into the slag was very high. Large quantities of polygonal reaction products and blow holes with diameters above 200 mm were found in the quenched samples. The reaction product was shown to be manganese sulphide and evidence indicates that this is assisted to the surface of the melt by bubbles of potassium vapour.     

数控磨床在磨削中的几个问题及采取的措施

目前，随着现代工业突飞猛进的发展，要求加工设备的精度越来越高。因此数控机床的需求量也越来越大。现就数控端面外圆磨床在磨削加工中容易出现的几个问题及其后果和如何利用数控系统的软件功能解决这些问题。     

金属铁熔融过程中镁脱氧产物的特性

在高温钼丝炉内向铁液中分别加入NiMg和SiMg合金进行脱氧,分析过程中溶解氧、全氧、残镁量及夹杂物随时间的变化,并与铝脱氧进行对比。结果表明:加入0.05%的SiMg合金处理后,铁液中溶解氧含量(质量分数)为1.5×10-6,全氧含量为1.9×10-5;经SiMg与NiMg合金处理的试样中夹杂物变化基本相同;加入镁合金并保温15min后凝固试样中夹杂物尺寸明显减小,约为2μm,其成分由Mn-Si-Al复合氧化物转变为Mg-Al尖晶石类夹杂物;加入Al并保温15min后,凝固试样中夹杂物尺寸较大,约为5μm,成分为纯Al2O3夹杂物;SiMg合金处理的试样中单位面积上夹杂物数量最少,钢中夹杂物最为细小、分散。