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

GOALI/IUCRP：用于高温冶金过程中熔体成分现场监测的固态电流传感器

• 批准号: 9424069
• 负责人: Uday Pal
• 金额: $ 25.66万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-15 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9424069&HistoricalAwards=false
• 关键词: GOALI; IUCRP; Solid; State; Amperiometric

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.

小行星9424069 将设计和建造一个固态传感器，用于现场监测黑色金属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，氧离子传导稳定的氧化锆固体电解质将物理地将暴露于熔体的阴极隔室与暴露于参考气体的阳极隔室分开。 电极材料的可能选择包括难熔氧化物，例如铬酸镧和铬酸钇、掺杂氧化锆和各种惰性金属-氧化锆金属陶瓷。 将相对于对电极（阳极）对传感电极（阴极）施加负电位扫描。 当达到熔体中氧化物的解离电位时，氧化物将在阴极处还原，并且氧离子将被驱动通过固体电解质到达阳极，在阳极处它们将释放电子，并且将检测到通过装置的离子电流。 如果待检测的熔体中的氧化物具有不重叠且低于氧化锆的解离电位的解离电位，则这些氧化物可以通过该装置依次解离并区分。 一旦氧化物解离，电势扫描将导致离子电流峰，其将给出其浓度的测量。 用一台仪器就能检测出黑色金属冶炼和精炼渣中铁、锰、铬氧化物的浓度。 传感器将在三个明确定义的炉渣系统上进行测试，即CaO-SiO2-Al 2 O3-FeO、CaO-SiO2-Al 2 O3-FeO-MnO和CaO-SiO2-Al 2 O3-FeO-MnO-CrOx。 该工业合作伙伴将对该炉渣传感器进行包装，以便在炼钢厂进行现场测试。 对炼钢和钢包精炼渣中的FeO和MnO以及不锈钢炼钢渣中的CrOx进行适当的真实的实时检测是通过更好的过程控制来提高铁和合金元素的回收率以及减少非金属夹杂物的关键。 为了优化黑色金属和有色金属冶炼和精炼操作的过程控制，需要在过程的各个阶段真实的实时监测炉渣中某些关键组分的浓度。 目前，这些工艺中的所有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，并且它们花费相对较长的时间。 如果可以使用相对便宜的传感器进行炉渣成分的现场监测，则其将广泛用于熔炼和精炼过程控制，从而提高产品的质量，提高生产率，从而降低总的制造成本。