论文部分内容阅读
总结讨论了熔锍及熔融金属中元素选择性氧化的行为,举出镍锍中 Ni 与 S,铁液中 Cr,V,Nb,Mn 或 P 与 C 作为应用的实例.利用热力学分析提出氧化的转化温度的概念,并指出二步及一步计算该温度的方法.在排除新相生成的晶核能的条件下,氧化的转化温度与氧的存在形式(无论是气态 O_2,溶于金属液中的[O]或炉渣中的 FeO)以及氧的压力或活度无关,而只决定于参加反应的物质及产物的本质及活度(压力).同时,转化温度不是一成不变的温度,而是随着熔池组成的改变而不断地在变化.降低气体氧化产物的分压将有助于降低氧化的转化温度.理论计算的转化温度可提供使熔池中一个元素的优先氧化而使另一元素保留不变的最佳条件.小型实验和工业上实践证明,转化温度的概念可以成功地控制吹炼操作,作到按意图进行选择性氧化.影响熔池内元素氧化顺序的动力学因素也作了简略的分析.对镍锍脱 S、不锈钢脱 C 以及高碳锰铁降 C 的吹炼,熔池温度永远要高于相应熔池组成的转化温度.而对铁水脱 Cr 和铁水提 V 或 Nb,熔池温度则应保持低于相应熔池组成的转化温度.P,C 在铁水中的氧化顺序,除与转化温度有关外,还取决于熔渣组成以及 CO 承担的压力.
The behavior of selective oxidation of elements in molten solder and molten metal is summarized in this paper. Some examples of Ni, S in nickel matte, Cr, V, Nb, Mn or P and C in molten iron are given.Using thermodynamic analysis, And the method of calculating the temperature in two steps and one step.With the exclusion of the nucleation energy of the new phase, the transformation temperature of oxidation and the existence form of oxygen (whether in gaseous O 2 or in molten metal [O] or slag FeO) and the pressure or activity of oxygen has nothing to do, but only to participate in the reaction of the substance and the nature and activity of the product (pressure) at the same time, the conversion temperature is not a constant temperature, but with the Changes in the composition of the melt pool are constantly changing .Decreasing the partial pressure of the gas oxidation product will help reduce the conversion temperature of the oxidation.The theoretically calculated conversion temperature may provide for the preferential oxidation of one element in the bath and the retention of the other element Unchanged Best Conditions Small experiments and industrial practices have demonstrated that the concept of conversion temperature can successfully control the blowing operation to achieve selective oxidation as intended. The kinetic factors affecting the order of elemental oxidation in the bath A brief analysis of nickel matte off S, stainless steel off C and high carbon ferromanganese down C blowing temperature is always higher than the molten pool composition of the transition temperature, while the hot metal off Cr and hot metal to mention V or Nb , The bath temperature should be kept below that of the corresponding bath, and the order of oxidation of P and C in the hot metal depends on the composition of the slag and the pressure on the CO, in addition to the conversion temperature.