铸态QT450-15高韧性球墨铸铁的生产

分析了化学成分、脱硫处理、球化及孕育处理等主要工艺因素对铸态QT450-15高韧性球墨铸铁铸件生产的影响.     

胺法脱硫工艺故障诊断系统的开发

根据宝钢化工公司二期脱硫的实际运行情况，结合生产操作经验．建立了数学模型和专家知识库。开发了胺法脱硫工艺故障诊断的专家系统，对提升煤化工生产操作有一定的借鉴。     

B2O3对CaO基渣精炼的助熔作用和脱硫的影响

使用RTW-08熔体物性测定仪通过旋转粘度计法测定了熔渣的粘度.试验结果表明,B2O3和CaF2在46%CaO-10%BaO-11.2%SiO2-11.6%Al2O3基础渣系中的助熔效果相当;在CaO-SiO2-10%BaO-11.6%Al2O3-10%CaF2基渣的碱度(CaO+BaO)/(SiO2+B2O3)为2.5和2.8时,用B2O3替代1/4 SiO2后精炼渣高温熔化性能稳定,粘度值降低至0.3～0.5 Pa·s;碱度2.8时,含20.6%SiO2渣剂的脱硫率为85%(S含量由0.008%降至0.001 6%),而含10.3%SiO2-10.3%B2O3渣剂的脱硫率为91.3%(S含量由0.008%降至0.000 7%).     

Flue gas cleaning in power stations by using electron beam technology. Influence on PAH emissions

The electron beam technology (EBT), proven treatment for SO₂ and NO_x removal, is applied to different power stations as hot gas cleaning system. In this paper, an assessment of this technique installed in a Bulgarian power station on organic emissions is analyzed. The Polycyclic Aromatic Hydrocarbons (PAH) content, not only emitted in the gas phase but also trapped in the solid phase, has been carried out before and after the irradiation. The main aim has been to know whether the EBT affects organic emissions, like PAH, as it happens with inorganic pollutants, like SO₂ and NO_x, studying EBT effects from an organic environmental point of view.     

某铜矿重介质产品提铁降硫选矿试验

某铜矿重介质产品铁品位56.24%,硫含量高达9.34%,95.72%的硫以磁黄铁矿的形式存在。为获得硫含量<2%的铁精矿,按磨矿—弱磁选—浮选原则流程对该矿石进行了选矿试验。试验结果表明,在最佳试验参数下,重介质产品经一段磨矿（-0.043 mm 85%）—1粗1精弱磁选—1粗2扫脱硫浮选流程处理,可获得产率45.23%、硫含量为1.52%、全铁品位66.50%的铁精矿,可作为后续钢铁冶炼原料的配矿使用,为此类重介质产品的利用提供技术参考。     

镁钙质耐火材料脱硫反应动力学研究

将镁钙砖(w(MgO)=75.13%,w(CaO)=22.09%)制成坩埚烘干,将配好的钢样放于镁钙坩埚内,置于高温管式炉中,同时通氩气保护,升温至1600℃恒温5~70min,每隔5min取样,利用偏光显微镜和直读光谱仪分析镁钙坩埚的显微结构变化及钢液中[S]含量的变化,并建立钢液脱硫反应动力学模型,研究1600℃时镁钙耐火材料对钢液脱硫的动力学机理。结果表明:在1600℃下,反应时间为45min时,脱硫效果最好,脱硫率可达到70.12%,但超过45min,脱硫率降低,出现“回硫”现象;脱硫反应初期为界面化学控制过程,后期是扩散控制过程;计算得到化学反应速率常数Kr=5.50×10-4m.s-1,扩散系数Deff=1.33×10-8m2.s-1。     

Simultaneous biodesulphurization and denitrification using an oil reservoir microbial culture: Effects of sulphide loading rate and sulphide to nitrate loading ratio

Biooxidation of sulphide under denitrifying conditions is a key process in control of souring in oil reservoirs and in treatment of gas and liquids contaminated with sulphide and nitrate. In this work, biooxidation of sulphide was studied using a representative culture originated from an oil reservoir. Effects of sulphide concentration, sulphide to nitrate molar ratio, and loading rates of sulphide and nitrate on their removal rates and composition of the end products were investigated. In the batch system sulphide removal rate passed through a maximum as sulphide concentration was increased from 2.1 to 16.3 mM, with the highest rate (2.06 mM h⁻¹) observed with 10.7 mM sulphide. Nitrate removal was coupled to sulphide oxidation and the highest removal rate was 1.05 mM h⁻¹. In the continuous bioreactors fed with 10 and 5, 15 and 7.5, and 20 and 10 mM sulphide and nitrate, cell wash-out occurred as dilution rate was increased above 0.15, 0.13 and 0.08 h⁻¹, respectively. Prior to cell wash-out linear increases in sulphide and nitrate removal rates were observed as loading rate was increased. The highest sulphide and nitrate removal rates of 2.0 and 0.92 mM h⁻¹ were obtained in the bioreactor fed with 15 mM sulphide and 7.5 mM nitrate at loading rates of 2.1 and 0.93 mM h⁻¹, respectively. Short residence times and high sulphide to nitrate ratios promoted the formation of sulphur, a desired end product for ex situ treatment of contaminated streams. Combination of long residence times and low sulphide to nitrate ratios, which favours formation of sulphate, is the suitable strategy for in situ removal of H₂S from oil reservoirs.     

管道喷射烟气脱硫性能及其脱硫产物分析

利用扫描电镜，分析了不同消化制备条件下消石灰的结构特性，在管道喷射试验装置上进行烟气脱硫的试验研究。结果表明，加NaCl加压消化所生成消石灰的颗粒粒度最小，比表面积最大；加压、加NaCl的脱硫产物的颗粒粒径较大，表面极不规则，有大量纤维状细颗粒附着，具有较高的粗糙度，为扩散和化学反应的最佳匹配创造了有利条件。在试验工况下，添加NaCl加压消化喷浆脱硫的脱硫效率最高。在Ca/S比为2．5的情况下，脱硫效率可以达到70％。     

专家系统在铁水脱硫中的应用

铁水脱硫在钢铁生产中是十分重要的一个生产环节，在实际的生产中铁水脱硫是一个十分复杂的化学物理变化过程。由于被控对象具有大时滞、非线性等特性，运用传统的脱硫控制方法不能很好的控制生产过程。本文介绍了在铁水脱硫过程中加入专家系统的控制方法，该方法将专家系统和模糊控制的优点很好的与实际生产相结合，可以很好地克服大时滞、非线性、难以建立精确数学模型的困难。改进后的系统不仅具有专家系统的高水平问题求解能力，并且具备模糊理论解决不确定问题的能力。     

高性能结构建筑用钢Q345GJ-Z25的冶炼连铸工艺实践

叙述了新钢公司炼钢厂高性能建筑结构用钢的开发冶炼实践。摸索出转炉低磷钢水冶炼、LF炉钢水精炼及4号连铸机浇注等工艺方法。