KINETIC STUDY ON DEPHOSPHORIZATION REACTION BETWEEN LIME-BASE SLAG AND HIGH CARBON MOLTEN IRON

本研究旨在对铁水处理过程中的脱磷行为有一个科学的认识。本研究的特点是：1)新采用CaO-lt；Li_2O&gt；-&lt；SiO_2&gt；系基渣；2)实验中控制熔体搅拌。KERAMAX电炉是新配备的。使用该炉可方便地实现温度和气氛的控制。2.测定了基渣的二氧化硅活性、反应组份FeO的活性和磷酸盐容量。这为研究基础渣系的基本性质提供了有用的信息。3.研究了高碳铁水与含FeO渣的脱磷反应速率。结果表明，在反应过程中发生了从脱磷到复磷的转变。在反应模型的基础上对脱磷反应机理进行了探讨。4.随着起始磷浓度的变化I…更多的N金属和炉渣，进行了从脱磷到复磷的各种反应。根据准平衡状态的数据，得到了炉渣-金属界面的氧势。5.对炉渣-金属体系中的硅氧化反应进行了动力学研究，为阐明脱磷机理提供了有用的信息。通过研究，阐明了搅拌在金属相和渣相中的作用以及渣-金属界面的CO析出。根据A反应模型，估算了硅氧化过程中炉渣-金属界面的氧势。这将为建立严格的脱磷反应模型提供基础数据。6.进一步的研究计划作为新的研究项目：1)建立严格的反应模型，从理论上解释炉渣与金属之间发生的各种反应之间的关系；2)阐明氧化铁的行为对脱磷的影响。较少

THE PRESENT STUDY HAS AIMED AT GETTING SCIENTIFIC KNOWLEDGE ON DEPHOSPHORIZATION IN HOT METAL TREATMENT. THE CHARACTERISTIC POINTS IN THIS STUDY ARE: 1)BASE SLAG OF CaO- <Li_2O> - <SiO_2> SYSTEM IS NEWLY USED, AND 2)STIRRING OF THE MELT IS CONTROLLED IN THE EXPERIMENT.1. KERAMAX ELECTRIC FURNACE IS NEWLY EQUIPPED. WITH USING THIS FURNACE, CONTROL OF TEMPERATURE AND ATMOSPHERE WERE EASILY PERFORMED. 2. MEASUREMENTS WERE MADE ON SILICA ACTIVITY, ACTIVITY OF FeO ADDED AS THE REACTION COMPONENT, AND PHOSPHATE CAPACITY OF THE BASE SLAG. THESE HAVE PROVIDED USEFUL INFORMATION ON FUNDAMENTAL PROPERTIES OF BASE SLAG SYSTEM. 3. STUDIES HAVE BEEN MADE ON THE RATE OF DEPHOSPHORIZATION REACTION OF HIGH CARBON MOLTEN IRON WITH FeO-CONTAINING SLAGS. IT WAS CLEARLY SHOWN THAT DURING THE REACTION A CHANGE FROM DEPHOSPHORIZATION TO REPHOSPHORIZATION OCCURRED. REACTION MECHANISM OF DEPHOSPHORIZATION IS EXAMINED ON THE BASIS OF REACTION MODEL. 4. WITH VARIATION OF THE STARTING PHOSPHORUS CONCENTRATIONS I … More N METAL AND SLAG, VARIOUS REACTIONS RANGED FROM DEPHOSPHORIZATION TO REPHOSPHORIZATION WERE PERFORMED. FROM THE DATA IN QUASI-EQUILIBRIUM STATE, VALUES OF OXYGEN POTENTIAL AT THE SLAG-METAL INTERFACE IS OBTAINED. 5. TO OBTAIN USEFUL INFORMATION ON CLARIFYING THE MECHANISM OF DEPHOSPHORIZATION, KINETIC STUDIES HAVE BEEN MADE ON SILICON OXIDATION IN SLAG-METAL SYSTEM. FROM THE STUDY, THE EFFECTS OF STIRRING IN THE METAL AND SLAG PHASES AND CO EVOLUTION AT THE SLAG-METAL INTERFACE ARE CLARIFIED. ON THE BASIS OF A REACTION MODEL, THE OXYGEN POTENTIAL AT THE SLAG-METAL INTERFACE DURING SILICON OXIDATION IS ESTIMATED. THIS WOULD PROVIDE FUNDAMENTAL DATA ON ESTABLISHING THE STRICT DEPHOSPHORIZATION REACTION MODEL. 6. FURTHER STUDIES ARE BEING PLANNED AS NEW RESEARCH PROJECTS ON 1)DEVELOPING STRICT REACTION MODEL WHICH COULD EXPLAIN THEORETICALLY THE RELATIONSHIP BETWEEN VARIOUS REACTIONS OCCURRING BETWEEN SLAG AND METAL AND 2)ELUCIDATING THE EFFECT OF THE BEHAVIOR OF FERRIC OXIDE ON DEPHOSPHORIZATION. Less