GOALI/IUCRP: Solid State Amperiometric Sensor for In-Situ Monitoring of Melt Composition in High Temperature Metallurgical Processes

[4244069]将设计和建造一种固态传感器，用于现场监测黑色和有色金属冶炼和精炼过程中遇到的氧化物（渣）熔体成分。在该装置中，氧离子导电稳定的氧化锆固体电解质将暴露于熔体的阴极隔室与暴露于参比气体的阳极隔室物理分离。电极材料的可能选择包括耐火氧化物，如镧和钇铬铁矿，掺杂氧化锆和各种惰性金属-氧化锆陶瓷。相对于对极（阳极），将对感测电极（阴极）施加负电位扫描。当熔体中氧化物的解离电位达到时，氧化物将在阴极处减少，氧离子将通过固体电解质被驱动到阳极，在那里它们将释放电子，并通过该装置检测到离子电流。如果待测熔体中的氧化物解离电位不重叠且低于氧化锆的解离电位，则该装置可对这些氧化物进行顺序解离和区分。一旦氧化物被解离，电位扫描就会产生离子电流峰值，从而测量其浓度。通过使用单一设备，可以检测和测量铁冶炼和精炼渣中铁、锰和铬氧化物的浓度。该传感器将在三种明确的渣体系上进行测试，分别是CaO-SiO2-Al2O3-Feo、CaO-SiO2-Al2O3-Feo - mno和CaO-SiO2-A12O3-FeO-MnO-CrOx。工业合作伙伴将包装这种炉渣传感器，用于炼钢设施的现场测试。实时检测炼钢和钢包炼钢渣中的FeO和MnO以及不锈钢炼钢渣中的CrOx是通过更好的过程控制提高铁和合金元素回收率，减少非金属夹杂物的关键。为了实现铁、有色金属冶炼精炼过程的优化控制，需要在冶炼过程的各个阶段对炉渣中某些关键组分的浓度进行实时监测。目前，在这些过程中，所有的炉渣成分分析都是用昂贵的分析设备对从熔体中取出的样品进行的，并且需要相对较长的时间。如果可以使用相对便宜的传感器对炉渣成分进行现场监测，它将广泛用于冶炼和精炼过程控制，从而提高产品质量，提高生产率，从而降低总体制造成本。

9424069 Pal A solid state sensor will be designed and built to in-situ monitor oxide (slag) melt composition encountered in smelting and refining of ferrous and non-ferrous metals. In this device, the oxygen ion conducting stabilized zirconia solid electrolyte will physically separate the cathodic compartment, exposed to the melt, from the anodic compartment, exposed to a reference gas. Possible choices for electrode materials include refractory oxides such as the lanthanum and yttrium chromites, doped zirconia and various inert metal-zirconia cermets. A negative potential sweep, will be applied to sensing electrode (cathode) with respect to the counter electrode (anode). When the dissociation potential of an oxide in the melt is reached, the oxide will reduce at the cathode and the oxygen ions will be driven through the solid electrolyte to the anode, where they will liberate electrons and an ionic current through the device will be detected. If the oxides in the melt, which are to be detected, have dissociation potentials that do not overlap and are lower than that of zirconia, then these oxides can be sequentially dissociated and distinguished by this device. Once an oxide is dissociated, the potential sweep will result in an ionic current peak which will give a measure of its concentration. By using a single device one could detect and measure the concentrations of the oxides of iron, manganese and chromium in ferrous smelting and refining slags. The sensor will be tested on three well defined slag systems, CaO-SiO2-Al2O3-Feo, CaO-SiO2-Al2O3-FeO-MnO, and CaO-SiO2-A12O3-FeO-MnO-CrOx. The industrial partner will package this slag sensor for on-site testing in steelmaking facilities. Proper real time detection of FeO and MnO in steelmaking and ladle refining slags and also CrOx in stainless steelmaking slags is key to improving the recovery of iron and alloying elements and decreasing non-metallic inclusions through better process control. For optimum process control of ferrous and non-ferrous smelting and refining operations, concentration of some critical components in slags need to be monitored in real time at various stages during the process. Currently, all slag composition analyses in these processes are performed with expensive analytical equipment on samples removed from the melt and they take a relatively long time. If in-situ monitoring of slag composition can be performed using a relatively inexpensive sensor it would be widely used for smelting and refining process control, resulting in improving the quality of the product, increasing productivity and thereby decreasing the overall manufacturing cost.