在线测量钢液中锰含量的传感法研究

Manganese is an important alloying element in steel, it play an important role for improving the performance of the steel. The content of manganese in steel is required to be strictly controlled, to produce high-quality steel. The changes of manganese content is very complex in the steel making process, and the measurement method of manganese in steel melts are complex, and the measurement time is very long, There is an urgent need for on-line and rapid measurement technology to measure manganese content in the liquid steel. The solid state electrolyte sensing method of on-line monitoring the activity of manganese was proposed, it could be used to keep abreast of the physical and chemical behavior of manganese in the steel making process. The preparation and property of the solid state ionic conductors will be investigated, and the ion transport number will be measured. The auxiliary electrode and reference electrode compatible with solid electrolyte will be selected. The manganese sensor will be designed and assembled, combining with prepared high-precision, multi-functional sensor measurement system, to measure the activity of manganese in the liquid steel. The properties of the sensor will be studied. The experimental results will be analysized by the theories of thermodynamics, kinetics, structure chemical and electrochemical. A new method for measuring manganese in steel melts will be established, and the research results will provide the theory and experimental basis for application of measuring method in the production process.

锰为钢中的重要合金元素，在提高钢材的性能方面起到了重要的作用。生产高品质合金钢，需严格控制钢中的锰含量，但炼钢过程中锰含量变化复杂，目前钢中测锰方法皆为取样分析法，存在复杂、信息滞后等缺点，亟需一种能在线、快速、精确测量钢液中锰含量的方法。本研究提出采用固体电解质传感法在线、快速测量钢中锰的活度，及时了解炼钢过程中锰的物理化学行为，以生产出高质量钢材。本研究拟探索制备合适的固态离子导体，研究掺杂及合成方法对其性能的影响，测定离子迁移数；筛选和制备与固体电解质物理化学相容性良好的参比电极及辅助电极；研制钢液测锰的化学传感器探头，配合研发高精度、多功能的传感器测量系统，进行钢液快速测锰，研究传感器的响应时间及使用寿命；结合热力学、动力学、结构化学及电化学分析研究结果，丰富固态离子学理论及钢的基础热力学数据，形成具有我国自主知识产权的钢中测锰新方法，为钢中锰含量的测量和控制，提供理论及应用依据。

钢铁冶炼过程中，锰含量变化较大，高品质钢要求对锰含量精确控制，现有钢中测锰方法存在复杂、信息滞后等缺点。因此，研究开发了一种能在线、快速、精确测量钢液中锰含量的方法。研究分别采用热辐射法及微波法制备Zr1-xMxO2-x(M=Mg,Y; x=0.06, 0.07, 0.08, 0.09, 0.15, 0.20)固体电解质，表征了其性质，探索出了最佳的制备工艺，筛选出了可以用于钢液测定锰含量的传感器材料；研究分别采用物相渗透及涂覆烧结法制备了辅助电极层，探索出了辅助电极的最佳制备方法及工艺参数；研制了两种结构了锰传感器探头；根据传感器信号的特性，开发了可采集、显示、储存传感器信号的测试系统；采用自行研制的两种结构的锰传感器，应用于钢液测定锰含量。研究表明，合成的固体电解质中含有立方固溶体相，1600℃时的离子电导率>0.01S/cm；通过涂敷共烧结的方法，可以同时制备含MnO独立相的辅助电极和Zr0.92Mg0.08O1.92固体电解质，辅助电极渗透层深度约150µm；采用自制的锰传感器测定了1600℃铁液中锰的电动势，锰传感器的响应时间约3s，钢液中的锰含量和锰传感器电动势值呈线性关系，得到了关于锰含量与电动势的关系方程。研究将为快速测定锰含量的新方法提供理论和应用依据。