采用Ausmelt法改造会泽铅锌矿铅冶炼系统的设想

结合会痒船锌矿铅冶炼系统烧结改造及其烟气治理可行性研究设计情况，提出用Ａｕｓｍｅｌｔ法进行改造铅冶炼系统的设想，介绍了方案及其特点。     

丰越环保液碱改石灰石烟气脱硫获得成功

正近日,湖南省郴州丰越环保科技有限公司一分厂氧化锌车间烟气脱硫系统改造项目的调试工作取得圆满成功。丰越环保属于国家重金属污染防治产业技术创新战略联盟成员,在金属冶炼行业有较大影响力。本次氧化锌车间烟气脱硫系统改造项目工况烟气量峰值为80 000 m~3/h,反应器入口烟气温度为60     

烧结冷却机余热发电系统及其关键技术

根据烧结冷却机的工艺特点,分析了冷却烟气余热的特性及其影响因素,提出了建立烧结冷却机烟气余热发电系统的原则以及对系统的评价问题。同时,还就烧结余热发电系统的几个关键技术,如烟气参数选择、热力系统参数选择、冷却机密封改造、系统的运行控制等提出了作者的观点和建议。     

100t电炉烟气余热回收实践

介绍了江阴兴澄特种钢铁有限公司100t电炉烟气余热回收工程,其烟道冷却方式由水冷改造为汽化冷却,采用辐射换热器和热管换热器回收烟气中余热。重点说明了电炉烟气余热回收系统的系统组成、工艺流程、主要技术措施、技术经济分析及其发展前景。     

石钢转炉一次除尘设备分析及改造

首先结合转炉实际烟气量的计算,对一次风机的工作能力进行了分析;然后根据实际除尘效果指出了除尘设备的薄弱环节,并对现有设备进行了改造。改造后的一次除尘设备可以满足生产要求和环保要求,从根本上解决了原有系统烟气带水、炉口溢烟等问题。     

铜精矿预干燥烟气处理系统的改造和生产实践

简述了贵溪冶炼厂铜精矿预干燥烟气处理系统改造前的基本情况,分析了改造前预干燥烟气处理系统存在的问题和改造目标,详细论述了改造前和改造后的预干燥烟气处理的工艺流程,介绍了改造前和改造后的运行数据,并对本次改造的技术特点进行了总结。     

预干燥脱硫系统烟气酸性冷凝水的处理

以预干燥脱硫系统烟气酸性冷凝水为研究对象,研究治理烟气酸性冷凝水的工艺技术。介绍预干燥脱硫系统烟气酸性冷凝水处理改造情况,阐述了设施配备和工艺流程。对烟气酸性冷凝水处理改造情况进行了梳理。分析了烟气酸性冷凝水对现有工艺设备造成的影响,并提出了改进建议。     

1 200 kt/a铜冶炼烟气制酸装置改造及运行实践

详细论述了紫金铜业有限公司1 200 kt/a冶炼烟气制酸系统的改造方案,包括烟气净化、转化、吸收、尾气脱硫的改造内容。运行实践证明,转化率达99.9%以上,系统自动化程度提高,尾气排放由平均230 mg/m3下降至43 mg/m3,节能降耗效果显著,运行平稳,经济可行。     

910kt/a冶炼烟气制酸系统挖潜改造及运行实践

介绍紫金铜业910kt/a冶炼烟气制酸系统的挖潜改造主要内容和运行实践。通过在转化工序应用预转化工艺、干吸工序补充生产发烟酸等,转化进气浓度由12%提升至15.89%,改造后系统运行平稳,平均转化率达99.9%以上,实践证明该制酸系统挖潜改造较为成功。     

湍冲洗涤器在卡尔多炉处理复杂稀贵物料烟气净化回收系统中的应用研究

根据卡尔多炉处理复杂稀贵物料时烟气高尘、高硒、高变的特点,进行了湍冲洗涤器研发、设计以及在卡尔多炉处理复杂稀贵物料烟气净化回收系统中的应用研究。研究结果表明:在卡尔多炉处理复杂稀贵物料烟气净化回收系统中使用湍冲洗涤器可有效处理烟气量波动大、含尘量高的烟气,其收尘效率达到98%以上,烟尘回收率达到99.5%以上,烟气量变化较大情况下,达到《工业炉窑大气污染物排放标准》(GB 9078—1996)中有色金属熔炼炉的二级标准,并能高效回收烟气中的有价硒。     

串联法熟料烧结过程中硫的行为研究

对熟料烧结过程硫的行为及转化规律进行研究。研究结果表明：未加还原剂烧结时,温度越高,反应时间越长,越有利于生料中的硫化物生成硫酸钠,熟料中大部分含硫离子进入溶出液,只有少部分硫进入烧结法赤泥。生料加煤还原烧结时增加还原剂加入量,提高烧结温度,延长烧结时间,有利于硫酸钠的还原过程。熟料中铁含量对硫化物型硫的影响较小。     

热连轧E36船板钢连续冷却相变行为

通过热模拟试验机模拟了20 mm E36船板钢(%:0.15C、0.38Si、1.56Mn、0.011P、0.002S、0.04Nb、0.06V、0.02Ti、0.037Als)经1 080℃和830～890℃分别以变形速率1 s^-1变形30%的双道次轧制及冷却过程,测得连续冷却转变曲线,并研究终轧温度和轧后冷却速度(5～25℃/s)对该钢相变和组织的影响。结果表明,随着冷却速度的增加,相变开始温度降低,珠光体的体积分数减小,贝氏体的体积分数增大;随着终轧温度的降低,相变开始温度升高;铁素体晶粒随冷却速度的增加和终轧温度的降低而细化。     

A Conversional Model for Austenite Formation in Hypereutectoid Steels

An on-heating conversional model has been proposed to calculate the volume fraction of austenite in hypereutectoid steels from dilation strain. The transformation strain equation for austenite formation from ferrite and cementite was developed with lattice parameters modified to include alloying element effects. The conversional model was verified by comparing calculations with experimentally measured transformation temperatures and constituent volume fractions in the transformation temperature range for various heating rates. A continuous heating transformation (CHT) diagram was produced from model results.     

烧结烟气高效脱硫制酸系统设计

根据攀钢烧结烟气SO2含量高的特性,采用高效循环吸收法烟气脱硫技术进行系统设计,通过脱硫液对烧结烟气中SO2的吸收与解析,得到90%以上纯度的SO2气体并生产浓硫酸,同时烧结烟气达标排放,在脱硫过程中无二次污染物产生,脱硫率达93%以上;攀钢烧结系统技术改造(三期)工程实践证明该脱硫系统运行良好。     

硫在含碳球团内的转化行为

为了研究含碳球团还原产品中硫含量过高的问题和出路,笔者借鉴高温法定硫的原理,设计了一套分析测定装置,首次系统地研究了铁精矿配加烟煤、无烟煤和生石灰等原料之后的含碳球团在不同温度、时间条件下硫的分解转化行为,得出了煤种、CaO含量、温度和时间等条件对产品硫含量的影响趋势,分析揭示了试验现象与脱硫反应之间的规律,并对含碳球团的工艺选择与环保的关系进行了相应的论述.     

高频-红外碳硫分析仪测定精锑中的硫

介绍了采用HW2000型高频红外碳硫分析仪测定精锑中硫的含量,确定了对样品称样量、助熔剂种类及用量等测定条件进行优化的试验,用国家标准物质验证了方法准确度和精密度,相对误差(RE)小于0.10%,相对标准偏差RSD小于3.0%(n=6)。用该仪器测定精锑中硫的分析结果与标准值相符合,且方法操作简单、准确、分析周期短,已应用于某公司实际生产工作。     

Monte carlo-method simulation of the deformation-induced ferrite transformation in the Fe-C system

A Monte Carlo (MC) technique has been used to model deformation-induced ferrite transformation (DIFT) in an Fe-C binary system on a mesoscale. The effects of strain rate, strain, and recrystallization of the matrix on DIFT are investigated. Increasing the strain rate slightly retards the onset of DIFT. The volume fraction of ferrite increases gradually as the strain increases before the volume fraction of ferrite reaches its saturation value. After the volume fraction of ferrite becomes saturated, it oscillates around its saturation value. The recrystallization of austenite slightly retards the onset of the DIFT. Although the recrystallization of austenite reduces the equilibrium volume fraction of ferrite significantly, it cannot completely suppress DIFT. The stress concentration has been shown to induce the nucleation of ferrite near the grain boundaries and phase boundaries. The significance of the reverse transformation has been investigated. We found that there is a temporal oscillation of the volume fraction of ferrite and the stored energy after they arrive at their saturation values. We conclude that this oscillation and the effect of the strain rate on DIFT are both brought about by the reverse transformation from induced ferrite to undeformed austenite. The diffusion behavior of carbon atoms in the systems is different for different strain rates. The simulation shows that the dynamic recovery of austenite cannot occur in the system during deformation under the present conditions. The results of the simulation show that, other than the oscillation of the equilibrium volume fraction of ferrite and the unusual diffusion behavior of carbon atoms, the simulation agrees well with the corresponding experimental results. The temporal oscillation of the volume fraction of ferrite and stored energy and the unusual diffusion behavior are two new phenomena that have not been reported by other researchers.     

Mathematical model for predicting the thermal and mechanical behaviour of rebar during quenching and self tempering

A mathematical model has been developed to predict the thermal and phase transformation behaviour of plain carbon steel rebars having mass contents of carbon in the range of 0.10 to 0.18 %, during quenching and self tempering process. The model takes into account the operating parameters such as rebar diameter, rolling speed, finishing temperature of rebar leaving the last stand of hot rolling mills. The design features of cooling tube and water flow rate have also been included in the model. The phase transformation kinetics from austenite to martensite at the surface, bainite beneath the surface and ferrite and pearlite in the core has been incorporated in the model. An attempt has been made to predict the yield strength of rebars as a function of chemical composition and volume fractions of different phases. In-plant trials were conducted at Visakhapatnam Steel Plant for 10 and 18 mm diameter rebars. Tempering temperature was measured and volume fractions of different phases and mechanical properties were determined. A very good agreement was found between measured and predicted volume fractions of martensite, bainite and ferrite + pearlite. Comparison between predicted and measured yield strength values show a reasonably good agreement under industrial conditions.     

常压蒸馏提取硫磺渣中的元素硫

对硫化锌精矿高压酸浸后的硫磺渣进行常压蒸馏提取元素硫的工艺研究，分析影响蒸馏过程的因素。结果表明采用常压蒸馏的方法能较好地脱除硫磺渣中的元素硫并得到硫磺，硫磺纯度达98％以上，试验残渣含硫可降为24．48％，为化合态的硫。     

超低硫钢生产工艺的研究与应用

莱钢银山型钢炼钢厂在超低硫钢([S]≤30 ppm)生产过程中,受原料、工艺条件等因素影响,终点钢水硫含量控制较不稳定,通过系统分析原料、转炉等工序对脱硫效果的影响,细化工艺流程,同时研究开发钢水固硫剂,使终点硫含量稳定在0.002%以下,满足了低硫钢生产需要。