Salucci Emiliano, D'Angelo Antonio, Fabozzi Antonio, Senneca Osvalda, Bellucci Francesco, Francesca Rosa, Grénman Henrik, Saxen Henrik, Di Serio Martino, Russo Vincenzo
Department of Chemical Science, University of Naples Federico II, Via Cintia 26, 80126 Napoli, Italy.
Department of Chemical Engineering, Åbo Akademi University, Henrikinkatu 2, 20500 Turku, Finland.
Materials (Basel). 2024 Sep 21;17(18):4630. doi: 10.3390/ma17184630.
The valorization of industrial byproducts is an emerging practice that aims to transform waste materials generated during production processes into valuable resources. In this work, a preliminary study was carried out on the thermal conversion of an industrial solid byproduct resulting from the pickling of metal surfaces, mainly containing iron (II) oxalate. In a fixed-bed reactor, the thermal conversion was investigated as a function of the operating temperature and overall time. The starting material and the products obtained after heat treatment were characterized in detail, using numerous qualitative and semi-quantitative techniques. The aim of this research was to determine the optimal operating conditions for the transformation of the industrial byproduct into a high-quality product. By varying the operating conditions, it was found that complete conversion of iron (II) oxalate to magnetite was achieved at high temperatures (i.e., 773 K and 873 K) after one hour of treatment. The resulting product had a low degree of crystallization, which increased slightly with an increasing reaction time at a temperature of 873 K, reaching a maximum of about 11%. The magnetite obtained can be used in the future as a starting material for chemical looping processes as a chemical/energy carrier for the production of hydrogen.
工业副产品的增值利用是一种新兴做法，旨在将生产过程中产生的废料转化为有价值的资源。在这项工作中，对金属表面酸洗产生的一种工业固体副产品的热转化进行了初步研究，该副产品主要含有草酸亚铁。在固定床反应器中，研究了热转化与操作温度和总时间的关系。使用多种定性和半定量技术对起始原料和热处理后得到的产物进行了详细表征。本研究的目的是确定将该工业副产品转化为高质量产品的最佳操作条件。通过改变操作条件发现，在高温（即773 K和873 K）下处理1小时后，草酸亚铁可完全转化为磁铁矿。所得产物的结晶度较低，在873 K的温度下，随着反应时间的增加，结晶度略有增加，最高达到约11%。所获得的磁铁矿未来可作为化学循环过程的起始原料，用作生产氢气的化学/能量载体。
