新冶钢265m2烧结机低成本生产实践

新冶钢265 m2烧结机自2011年5月投产以来,通过加强基础管理工作、优化配矿、综合利用废弃资源,开展低品质原料条件下“低成本、低消耗、高效益”烧结技术创新,以最低成本生产出了优质烧结矿,实现了科学烧结、经济烧结和高效烧结的目标.     

济(南)钢400m2烧结机自动化控制系统的开发

详细介绍了济钢新建400 m2烧结机的自动控制系统.该系统通过模型控制实现了烧结生产从配料一直到高炉上料全流程的自动化操作,满足了烧结精准生产的需求.同时,利用故障诊断系统能使检修人员快速、及时、准确地处理生产设备存在的问题,解决了各专业互相扯皮的矛盾,为高效、低成本烧结生产奠定了基础.     

烧结工序能耗预测与优化研究

烧结工序能耗预测与优化研究是确保生产有序合理、节能环保和低成本的重要手段.在烧结工序能耗定义分析及烧结工序能耗主要影响因素分析的基础上,建立了基于径向基神经网络-遗传算法(RBF-GA)的烧结能耗预测与优化模型.在神经网络模型对能耗高精度预报的基础上结合遗传算法求解优化模型,计算出最佳的输入参数组合.通过案例研究,验证了所提方法的正确性和有效性.     

适应超厚料层烧结的设备改造

在钢材市场持续疲软的情况下,为了适应烧结生产的低成本运行,对1号烧结机进行了适应厚料层烧结的设备改造,取得了很好的效果。     

基于遗传算法的混匀配矿理论研究

结合新钢烧结厂生产实际,利用烧结杯试验确定的铁矿石经济技术指标和经验公式确定的有害元素对铁矿石经济性的影响,并根据新钢主要原料的物理化学性能,运用Matlab 7.1建立了基于遗传算法的烧结配矿理论模型。该模型能够判断配矿方案对烧结成品率、烧结矿强度以及烧结成本的影响,为指导烧结生产和铁矿石采购、实现低成本优质烧结提供了理论依据和技术参考。     

宝钢烧结投产以来的技术进步

结合宝钢烧结投产以来对烧结工艺和设备进行的一系列革新和改造,分别从厚料层烧结工艺、高铁低硅烧结矿生产、低成本配矿、节能环保和提高产质量等方面回顾了宝钢烧结技术进步的历程,对烧结技术进步产生的效果进行了评述,并对今后宝钢烧结技术继续保持世界先进水平的前景进行了分析和展望。     

永通铸管烧结低成本配矿体系构建

分析了安钢集团永通铸管公司烧结配矿存在问题,深入开展配矿研究,规范烧结低成本配矿方案制定;开发应用烧结低成本配矿测算系统,采用配矿数学模型优化配料计算,并为铁矿粉采购提供科学高效的化学成分评价信息;完善烧结自动配料控制系统,精益配料作业。烧结低成本配矿体系构建效益显著。     

现行烧结-硬化工艺回顾

烧结-硬化工艺,因为不需要再进行热处理,已发展成制造淬硬粉末冶金零件非常有效的一种减低成本的生产方法.最近几年,在烧结-硬化材料系统和烧结炉技术方面都取得了进展.这篇论文将评述这些进展和制造优质烧结-硬化零件所需要的一些关键工艺参数.涉及的具体内容有:合金选择,力学与疲劳性能,显微组织改进,烧结炉冷却速率最佳化及正确的回火周期.     

八钢烧结低能耗低排放低成本运营实践

介绍了八钢烧结厂通过进一步优化烧结工艺,在原有的节能降耗基础上建立能源管控体系,采用了烧结余热发电技术、烧结脱硫脱硝技术以及酸性烧结矿等技术,并对烧结能源循环再利用结构以及冶金固废料的回收再利用技术等进行整合优化,进一步降低了烧结工序能耗和烧结矿成本,大幅度减少烧结有害气体、粉尘的外排,使烧结生产实现了低能耗、低排放和低成本运营。     

唐钢360m2烧结机降本增效措施

唐钢炼铁厂南区360m2烧结机系统应用现代化管理理念,从强化烧结过程、提高资源综合利用回收、新工艺技术开发应用、提高烧结自动化控制水平、配加低成本物料等方面提出了降低烧结工序成本的途径和措施。通过加强生产过程管理和组织优化,目前工序能耗稳定在了较好水平。     

烧结矿喷洒CaCl2溶液试验研究及工业应用

针对烧结矿低温还原粉化率偏高的现状,进行了喷洒CaCl2溶液试验,研究结果表明,烧结矿喷洒CaCl2溶液在溶液浓度为3％时,效果最佳,烧结矿低温冶金性能有明显改善。高炉工业生产显示,烧结矿喷洒CaCl2溶液后,高炉利用系数提高0．1t/m^3．d,入炉焦比降低5kg／t。     

Differential effects of Flk-2/Flt-3 ligand and stem cell factor on murine thymic progenitor cells

Most primitive thymic progenitors, termed CD4(low) cells (CD25- CD44+ CD117+), retain the ability to generate multiple lymphoid lineages. T cell lineage commitment occurs as CD4(low) cells differentiate into pro-T cells (CD25+ CD44+ CD117+). We previously reported that the in vitro cytokine responses of CD4(low) and pro-T cells differ. While Flt-3 ligand (Flt-3L) has been shown to be involved in early bone marrow hemopoiesis, its role in thymopoiesis has not been thoroughly examined. Here, we report that Flt-3L has no significant effect on pro-T cells, either by in vitro proliferation or in fetal thymic organ culture repopulation. In contrast, CD4(low) cells cultured in vitro for 3 days in IL-3 + IL-6 + IL-7 + Flt-3L generated a twofold increase in cell number 21 days after transfer into fetal thymic organ culture that increased to sixfold by day 35 when compared with the corresponding CD4(low) cells cultured in IL-3 + IL-6 + IL-7 + stem cell factor. Additionally, the Flt-3L-cultured CD4(low) cells displayed fetal thymic organ culture repopulation kinetics that more closely approximated those seen with freshly isolated CD4(low) cells. These data suggest that Flt-3L serves as a self-renewal or proliferation/expansion signal for CD4(low) cells, while the effect of stem cell factor is more likely to transduce a differentiation signal, resulting in more rapid repopulation at the expense of cell expansion.     

唐钢2560m^3高炉图拉法渣处理工艺及生产实践

１９９７年唐钢２５６０ｍ＾３高炉引起较为先进的俄罗斯图拉法渣处理工艺。这种渣处理具有设备简单、占地少、处理能力大、基建投资少、检验费用低、可安全处理带铁小于４０％的炉渣等特点。但在生产实践中仍发现了不少问题。并进行了改造，目前已基本满足了生产需要。     

LF预熔精炼渣成分优化的研究

研究了钢包炉(LF)用预熔精炼渣的优化方案,分析了CaO-Al2O3-MgO-BaO-SiO2预熔精炼渣系中各组分对该渣熔点、熔化时间以及脱硫能力的影响程度,得到了低熔点、低粘度、冶金效果好的渣系.得出预熔精炼渣的熔点、熔化时间受到碱度、氧化铝质量分数和萤石质量分数的综合影响,且渣的熔点不随MgO质量分数的增加而急剧增高.通过实验得到了LF用预熔渣的最优渣系,该渣系在天津钢管公司LF上应用取得了很好的效果,平均脱硫率由原来的71％上升到89％.     

Development of 3-D mathematical model of raceway size in blast furnace

A three-dimensional (3-D) mathematical model to predict raceway diameter has been developed based on previous 2-D studies. The results show that the 3-D simulated results on raceway diameter are in good agreement with measurements of two Chinese blast furnaces. Moreover, it is more precise than previous models. The effect of blast velocity, bed porosity and particle diameter has been investigated. An increase in gas velocity relative to a decrease in velocity leads to a larger downward frictional force so that the raceway diameter is smaller. A low bed porosity and a small particle diameter result in low normal pressure in the Cartesian region and low radial pressure in the radial region, which is not beneficial for smooth operation.     

Study of High Temperature Deformation and Recrystallization in W9Mo3Cr4V Steel

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Effects of Copper Powder Bearing Material Composition on Working Characteristics

Effects have been established for phosphorus and lead on the working characteristics of tinned bronze with high-speed operation (up to 20000 rpm or up to 2 m/sec) at low pressures (up to 2.0 MPa). It has been found that Cu - Sn - Pb - CP powder bearing material, where CP is a copper-phosphorus alloy, under such conditions has a lower coefficient of friction than does tinned bronze and a much higher wear resistance, while sliding bearings based on it have high working life. A microheterogeneous structure is formed in this material: an α-solid solution of tin in copper, along the boundaries of which there is uniformly distributed a strengthening phase (network of copper phosphide Cu₃P with inclusions of the phosphide eutectic Cu₃P + Cu₃Sn + (Cu - Sn), and there are lead inclusions at the grain boundaries intersections. This material has very good tribotechnical characteristics at high rotation speeds and low pressures and also low coefficient of friction, low wear, and consequently long working life of bearings made of it.__________Translated from Poroshkovaya Metallurgiya, Nos. 3–4(442), pp. 120–126, March–April, 2005.     

低品位次生硫化铜矿的细菌浸出研究

在硫酸体系中 ,对含有辉铜矿、蓝辉铜矿和铜蓝的低品位次生硫化铜矿的Fe3+ 浸出和细菌浸出进行了研究 ,通过对浸出过程的动力学进行分析 ,揭示了次生硫化铜矿的浸出过程和细菌浸出的作用机理 ,得出了细菌浸铜主要以间接机理进行的结论 ,提出了加快铜浸出速率的 2条途径。     

Low T3 syndrome

Many nonthyroidal illnesses are associated with reduced serum T3 and, in more severe conditions, T4 concentrations, without increased serum TSH secretion. The term euthyroid sick syndrome (ESS) identifies these low T3 and low T3-T4 states. It may be difficult to exclude central hypothyroidism in patients admitted to medical intensive care units. The mortality rate has been found to be inversely correlated with the serum T4 concentration. These abnormalities are a consequence of altered hepatic T3 production from T4 (through type 1 5'-desiodase inhibition), T4 serum protein binding and hepatic transport, and TSH secretion. Many mediators and drugs are involved in the pathogenesis of ESS. The role of cytokines has recently been emphasized. It remains unclear whether ESS represents a physiological protective mechanism, or a damaging maladaptative response and whether early thyroid hormones administration might improve survival in severe non thyroidal conditions.     

250mm超厚低合金高强度Q345D钢板的研制

通过采取较低碳、低锰、多元复合微合金元素化学成分设计,利用模铸浇注-3800 mm宽厚板轧机轧制-正火热处理生产线,成功地研制开发并批量生产出了250 mm超厚保性能、保三级探伤的低合金Q345D钢板。钢板各类夹杂物级别总和不超过3.0,晶粒度达到8.0~9.0级。性能富余量较大,其中屈服富余量在65~115 MPa,抗拉富余量在45~75 MPa,伸长率富余量为5%~10%,-20℃V型冲击功平均为106 J,-40℃V型冲击功平均达到了43 J,完全符合超厚Q345D的性能要求。