Method for measuring activity coefficient and activity of SiO2 in metallurgical slag

Abstract

The invention discloses a method for measuring the activity coefficient and activity of SiO2 in metallurgical slag, and belongs to the field of metallurgical engineering. The method comprises the steps that: mixed slag is prepared by simulating components of metallurgical slag in the actual metallurgical process, Cu serves as metal melt, C serves as a reducing agent, CO gas is introduced, SiO2 in the mixed slag reacts with solid C, Si generated after the reaction is dissolved into the metal melt, and the chemical equation of the reaction is (SiO2) + 2C (s) = [Si] Cu + 2CO (g); and after the reaction reaches balance, cooling is performed, the metal is separated from a slag sample,the content of SiO2 in the slag sample and the content of Si in the metal are measured, and the activity coefficient and activity of the SiO2 are calculated by using a formula derived from a chemical reaction equilibrium constant so as to provide a theoretical basis for formulating a smelting process and a continuous casting process of a new steel grade.

Description

technical field [0001] The invention relates to a method for measuring SiO in metallurgical slag 2 The invention relates to an activity coefficient and an activity method, belonging to the technical field of metallurgical engineering. Background technique [0002] The component activity in metallurgical slag is a very important thermodynamic property in the thermodynamics of the metallurgical process, and it is an important factor for metallurgists to study the thermodynamics of the metallurgical process, formulate the metallurgical process, design metallurgical equipment, and carry out metallurgical process and equipment transformation. Parameters have always been a research hotspot in the field of metallurgical thermodynamics. Although many relevant experimental measurement data have been accumulated at present, with the continuous emergence of new steel materials, these new steel types often contain a large amount of active metal elements that are often not high in previ...

AI Technical Summary

Problems solved by technology

Although many relevant experimental measurement data have been accumulated at present, with the continuous emergence of new steel materials, these new steel types often contain a large amount of active metal elements that are often not high in previous steel materials, such as aluminum and manganese. SiO in the slag in the reaction system is often required in the study of the smelting process and continuous casting process of its large-scale production 2 activity coefficient and activity data, but there is often no SiO in the slag system involved in the smelting or continuous casting of these new steel types 2 The activity coefficient and data of the activity, and the relevant theoretical model is used for calculation. Due to the complex composition of the slag involved, and the addition of SiO 2 Due to the complexity of the slag structure, the model calculation results obtained for these new slag systems often have large errors and cannot be applied, so experimental determination is often required

[0003] In existing studies, for SiO in slag 2 The determination of activity coefficient and activity usually adopts the chemical equilibrium method, and mostly uses molten iron as a reference metal, C as a reducing agent, and uses molten iron as a reference metal, and cannot be used for SiO in slag at a temperature below 1530°C. 2 Determination of activity coefficient and activity

In the existing literature, there are also low melting point metals such as copper as reference metals, but in the experiment, only 1 to 3 crucibles can be placed at a time, and only 1 to 3 components of slag can be measured at a time. 2 Activity Coefficient and Activity

In addition, the existing SiO 2 In the determination of the activity coefficient and activity, the blowing flow rate is often lower than 300mL / min. At this flow rate, the oxygen potential in the furnace is often difficult to control, because the oxygen in the furnace gas with a higher oxygen potential is very easy to participate in the furnace. The reaction between gold-slag-gas affects the activity coefficient and the reliability of the activity measurement results

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