70t转炉"留渣+双渣"脱磷工艺研究与实践

从优化转炉"留渣+双渣"脱磷工艺脱磷效果的角度,分别研究了倒炉温度、炉渣碱度以及(FeO)含量生产控制要点对脱磷率的影响。采用"留渣+双渣"冶炼工艺后,试验炉次转炉平均脱磷率达90%以上。     

SKF精炼炉留渣操作可行性探讨

分析了国内LF炉、SKF炉精炼渣的组成和本厂SKF炉精炼造渣过程 ,提出了SKF炉精炼留渣法的新工艺及其可行性。采用该工艺 ,可实现SKF炉快速化渣和降低精炼成本。     

SKF精炉炼留渣操作可行性探讨

分析了国内ＬＦ炉、ＳＫＦ炉精炼渣的组成和本厂ＳＫＦ炉精炼造渣过程,提出了ＳＫＦ炉精炼留渣法的新工艺及其可行性。采用该工艺,可实现ＳＫＦ炉快速化渣和降低精炼成本。     

含BaO渣系"渣洗"脱硫工艺的试验研究

介绍了济钢50 t转炉采用BaO渣系,进行炉外“渣洗”脱硫工业性试验的情况,结果是在加入量8 kg/t的条件下,平均脱硫率ηS≥35%,与不含BaO的CaO基脱硫剂相比ηS相对提高40%左右。探讨了含BaO渣系“渣洗”脱硫工艺的理论与工艺问题。研究表明该工艺简便、快速、经济和有效,可以投入大规模工业生产中。     

关于转炉溅渣护炉的几个工艺问题

分析总结了国内转炉溅渣护炉的生产经验,提出:①溅渣护炉的合理渣量为:Qs=0 301Wn(n=0 583～0 650);②适宜溅渣的合理终渣成分为:R=2 8～3 5,(TFe)=10%～15%,MgO>8%;③转炉出钢温度对炉龄的影响为:n=208529～120 9t     

转炉加料制度与前期脱磷及溢渣关联探究

通过理论分析及生产实践,了解转炉炼钢造渣机理以及不同阶段对脱磷反应的影响,通过对降温料以及造渣料加入批次以及顺序的调整,促进了吹炼前期的化渣,为前期脱磷反应创造了良好条件,同时有效地控制前期溢渣现象的出现,优化了炼钢工艺。     

复吹转炉溅渣护炉水模试验研究

通过水力学模型试验,研究了影响复吹转炉溅渣护炉效果的因素,研究认为,为了取得良好的溅渣护炉效果,顶、底吹流量及顶枪枪位应有一良好的配合.马钢50t复吹转炉的最优化工艺参数为:顶枪气体流量12000Nm3/h,枪位2000mm,留渣量9%,底吹气体流量60～120Nm3/h.     

100t转炉溅渣护炉工艺研究

为某厂100t顶吹转炉溅渣护炉提供最佳工艺参数,按照转炉相应比例设计水力模型并试验研究。根据试验结果,优化溅渣护炉工艺参数,相应调整溅渣氮气压力和枪位,提高了溅渣效果,溅渣后炉渣均匀涂覆到炉衬上,溅渣时间缩短到2．5～3min,进一步提高了转炉炉龄,实现24025炉的新记录。     

窄煤柱工作面沿空留巷围岩大变形控制技术及应用

针对窄煤柱工作面沿空留巷巷旁支护体参数不合理和围岩严重变形等问题,研究了不同巷旁支护体宽度、强度和充填率对窄煤柱工作面沿空留巷围岩变形破坏的影响。研究结果表明:充填体宽度、强度和充填率不同,对窄煤柱工作面沿空留巷围岩应力分布及变形有很大影响;充填体宽度、强度和充填率过低时充填体承载能力较小,沿空留巷围岩变形量较大;过高时顶板下沉量减小不明显,使成本增加;充填体宽度2 m,强度为30 MPa,充填率95%以上,可保证沿空留巷围岩稳定;提出的"巷内锚网索+巷旁充填柔模混凝土墙+单体柱+基本底注浆"联合支护技术,控制了沿空留巷围岩的大变形。工业性试验结果表明:沿空留巷顶底板移近量最大值600 mm,两帮移近量最大值为435 mm,分别是原方案变形量的55. 5%和51. 6%,沿空留巷围岩变形得到有效控制,能满足通风和安全生产的要求。     

红薯渣面条的制备工艺研究

将红薯渣添加到面条中,研究红薯渣粒度、添加量及面条轧制的厚度对红薯渣面条的影响。结果表明,红薯渣过100目筛、添加量为9%、面条轧制厚度为1.3 mm时,红薯渣面条的感官品质最好。在此工艺条件下,红薯渣面条的吸水率为233.08%,烹煮损失率为12.59%,断条率为0。     

新冶金渣系的开发及其应用

根据我国铁水预处理、钢水精炼和连铸的发展计划,从简要介绍传统冶金渣系的特点入手,分析了这３ 种新冶金渣系的现状及发展前景;详细介绍了不扒渣铁水脱硫技术和ＬＦ炉泡沫埋弧精炼技术的特征;通过预测铁水预处理、钢水精炼和连铸３ 种渣系产品的市场需要量,指出了其规范化、标准化的必要性     

CaO-SiO_2-MgO脱硅渣起泡性能的研究

分析了铁水脱硅预处理后炉渣起泡原因及机理,通过实验验证并提出了抑制炉渣发泡的措施.研究表明：将氧化剂连续、分散加入铁液,可减少单位时间内发泡气体的产生量,有利于抑制炉渣发泡.1450℃条件下,当碱度为0.6～0.8,w（MgO）为10%～20%时,碱度升高或w（MgO）增加,炉渣黏度呈降低趋势,密度变化不大,而发泡高度和发泡指数明显减小.随着w（MgO）增加,炉渣表面张力增大.炉渣碱度为0.8、w（MgO）为20%时,发泡性能最弱.向脱硅渣中加入适量CaO或MgO,可改变炉渣的物理化学性质,抑制炉渣发泡.     

Resource utilization of slag from desulphurization and slag skimming: A comprehensive recycling process of all components

In order to make the slag from desulphurization and slag skimming (SDSS) to be comprehensively recycled and utilized, a combined process of beneficiation and building materials preparation was proposed to recover iron from SDSS, meanwhile to apply the remaining slag tailings as cement admixture. From this process, three iron-rich products were recovered in stages by clean gravity - magnetic separation, slag tailings were left. Slag powder was prepared by ultrafine grinding of slag tailings. The stability, setting time and cement mortar strength of the slag tailings cements (STC) which were mixed with Portland cement and slag powder were studied respectively. The results showed that a proper overall performance still could be obtained at the slag powder content of 30%. Chemical composition analysis, X-ray diffraction (XRD) analysis, metallographic microscope and scanning electron microscope (SEM) analysis were employed to assess the characteristics of the SDSS and the products obtained from the whole process. The results indicated that the three iron-rich products could be used as a raw material for steelmaking and ironmaking and the relatively large amount of calcium silicate (C₂S) and tricalcium silicate (C₃S) in the slag tailings make the addition of slag powder into the Portland cement feasible.     

转炉前期炉渣喷溅的原因及对策

杭钢转炉炼钢厂转炉的炉熔比为0．74～0．8m^3／t,前期炉渣平均w（FeO）≥20％,铁水的（Si＋P）含量较高,在开吹4～5min时易发生炉渣喷溅。在分析前期产生炉渣喷溅原因的基础上,提出了降低喷溅的对策。     

强化预处理＋人工湿地处理农村污水技术分析

采用强化预处理＋人工湿地工艺处理农村污水,该工艺能够稳定运行,煤渣和砖渣1∶1配比填料适用于人工湿地。出水COD、NH3-N、SS均达到《城镇污水处理厂污染物排放标准》中一级B 标准,年实现 COD、NH3-N 削减量分别为9.94 t、1.72 t。     

二灰钢渣土抗压强度的正交试验研究

采用马鞍山钢铁集团钢渣公司的钢渣取代部分土配制成二灰钢渣土,通过正交试验方法研究了影响二灰钢渣土抗压强度形成的因素,并探寻最佳配合比。试验结果表明:石灰掺量对二灰钢渣土的早期抗压强度起主导作用,石灰掺量为9%、粉煤灰掺量为20%、钢渣掺量为30%的配合比7天和28天抗压强度最高。而粉煤灰掺量对二灰钢渣土的后期抗压强度起主导作用,石灰掺量为9%、粉煤灰掺量为50%、钢渣掺量为30%的配合比90天抗压强度最高。     

转炉渣系矿物相研究

分析不同转炉渣的化学组成,结合国内某钢铁厂风碎渣的成份,选择以CaO-MgO-SiO2-Fe2O3四元渣系作为基础渣,质量分数分别为48%,10%,12%和30%,将它作为实验室的合成渣系.使用SEM及EDS对各渣样矿物相进行分析,结果表明:该渣系矿物相的结构、组成与原渣的非常相近,即固溶了少量Fe元素的黑色f-MgO...     

Molten steel yield optimization of a converter based on constructal theory

Constructal theory is introduced into the molten steel yield maximization of a converter in this paper. For the specific total cost of materials, generalized constructal optimization of a converter steel-making process is performed. The optimal cost distribution of materials is obtained, and is also called as "generalized optimal construct". The effects of the hot metal composition contents, hot metal temperature, slag basicity and ratio of the waste steel price to the sinter ore price on the optimization results are analyzed.The results show that the molten steel yield after optimization is increased by 5.48% compared with that before optimization when sinter ore and waste steel are taken as the coolants, and the molten steel yield is increased by 6.84% when only the sinter ore is taken as the coolant. It means that taking sinter ore as coolant can improve the economic performance of the converter steelmaking process. Decreasing the contents of the silicon, phosphorus and manganese in the hot metal can increase the molten steel yield. The change of slag basicity affects the molten steel yield a little.     

粉煤灰矿渣复合水泥试验研究及其应用

通过试验研究了粉磨方式、细度、复合组分比例及添加剂对粉煤灰、矿渣、石灰石与少量熟料组成的复合水泥性能的影响 .研究结果表明 :当以上三组分比例适当时 ,通过添加剂的有效作用 ,采取合理的粉磨工艺和制度 ,在熟料掺量 5 0 %时可以配制出 6 2 5R或 6 2 5复合水泥 ,熟料掺量 4 0 %可以配制出 6 2 5或 5 2 5R复合水泥 ,熟料掺量 30 %可以配制出 5 2 5或 4 2 5R复合水泥 .同时 ,对上述部分水泥配制的高性能混凝土进行了试验研究