The Physical Chemistry of Metallurgical Slags

这个项目是对炼钢过程中冶金渣的物理化学研究。第一部分研究了铁液中杂质元素的去除，第二部分研究了表面活性溶质对熔渣表面张力的影响。下面将按此顺序简要阐述这些问题。超低碳、硫和磷钢的生产要求钢包冶金作为炼钢过程的一个组成部分。然而，目前的钢包冶金实践并没有规定去除所谓的不稳定元素，这些元素发生在充入碱性氧炉（BOF）的回收废钢中。这些元素包括锡、铅和铜，它们不能通过选择性氧化进入炉渣中从钢中去除。连铸钢产量的增加减少了内部废料的可用性，因此增加了必须使用外部废料的程度。在这个项目中，将对用含cac2的炉渣处理铁液中锡、铅和铜的去除程度进行实验研究。表面张力是影响矿渣泡沫寿命和稳定性的主要因素之一，低浓度表面活性溶质的存在可以显著降低冶金渣的表面张力。本课题将实验研究氧压和溶质P2O5、Cr2O3、CaF2和碱氧化物对CaO-SiO2和feo基熔体的影响。研究结果将为认识渣发泡现象提供依据。

This project is an investigation of the physical chemistry of metallurgical slags in iron and steel making processes. The first part of the study deals with the removal of tramp elements from liquid iron and the second part of the study deals with the influence of surface-active solutes on the surface tension of slag melts. These will be elaborated on briefly in that order in the following. The production of ultra-low C, S and P steels requires that ladle metallurgy be incorporated as an integral part of the steelmaking process. However, current ladle metallurgy practice does not provide for the removal of the so-called tramp elements which occur in recycled scrap steel charged to the Basic Oxygen Furnace (BOF). These elements include Sn, Pb and Cu which cannot be removed from steel by selective oxidation into the slag. The increased production of continuously-cast steel has decreased the availability of in-house scrap, and hence has increased the extent to which external scrap must be used. In this project an experimental study will be made of the extent to which Sn, Pb and Cu can be removed from liquid iron by treatment with CaC2-containing slags. Surface tension is one of the major factors which influence the lives and stability of slag foams and the surface tension of metallurgical slags can be significantly decreased by the presence of small concentrations of surface-active solutes. In this project an experimental study will be made of the influence of oxygen pressure and the solutes P2O5, Cr2O3, CaF2 and alkali oxides on CaO-SiO2 and FeO-based melts. The results will provide a basis for understanding the phenomenon of slag foaming.