The oxygen carrier (OC) is the main component of the chemical looping combustion (CLC), process. Most OCs have been developed synthetically using an active metal oxide combined with an inert material. When solid fuels are used, the OC becomes mixed with the ashes generated during the CLC process and has to be removed, thereby increasing costs. As a result, there is growing interest in the use of low-cost OCs based on manganese and iron. Given the widespread use of coal to produce energy, there is a trend toward the study of the CLC process using solid fuels, since this process has the lowest energy penalties of all the combustion methods involving CO₂ capture. Coproducts from the exploitation of Mn and Fe ores have been studied. These materials were selected from a group of eight minerals with Fe and Mn present in their composition, extracted from mines located in southwestern Colombia. The material selection process was based on crushing strength analysis and reactivity in thermographic analysis (TGA), using CH₄ as fuel. Two materials were selected, one based on Fe and another based on Mn, which presented the best behavior in their respective group. It was found that the studied two materials were more reactive with H₂ and CO than with CH₄. This was demonstrated by performing a kinetic study using a shrinking core model (SCM). The selected Mn-based oxide was evaluated to identify whether it had the properties required for chemical looping with oxygen uncoupling (CLOU), commonly found in Mn minerals with a high silica content. However, no evidence to this effect was found in experiments at 1000 °C using N₂ for OC decomposition and air as an oxidizing gas. The Mn ore showed the highest reactivity of all the studied materials, with a rate index of 11.9%/min in experiments at 950 °C using H₂ as the reducing gas. Finally, it can be concluded that the presence of silica improves the reactivity of the Mn ore, making it a promising carrier for use in in situ gasification chemical looping combustion (iG-CLC) technology.

中文翻译：

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哥伦比亚西南部用于化学成环燃烧的铁锰基矿物的还原和氧化动力学

氧气载体（OC）是化学循环燃烧（CLC）过程的主要组成部分。多数OC是使用活性金属氧化物与惰性材料结合合成开发的。当使用固体燃料时，OC与CLC过程中产生的灰烬混合在一起，必须去除，从而增加了成本。结果，人们越来越关注使用基于锰和铁的低成本OC。鉴于煤炭被广泛用于生产能源，因此有一种研究使用固体燃料的CLC工艺的趋势，因为该工艺在涉及CO ₂的所有燃烧方法中能耗最低。捕获。已经研究了锰和铁矿石开采的副产品。这些材料是从八种矿物中选出的，这些矿物的成分为铁和锰，选自哥伦比亚西南部的矿山。材料的选择过程基于压碎强度分析和热成像分析（TGA）中的反应性，使用CH ₄作为燃料。选择了两种材料，一种基于铁，另一种基于锰，它们在各自的组中表现出最佳的性能。发现所研究的两种材料对H ₂和CO的反应性比与CH _4的反应性高。通过使用收缩核模型（SCM）进行动力学研究证明了这一点。对所选的Mn基氧化物进行了评估，以确定其是否具有氧解偶联（CLOU）的化学环化所需的性能，而氧解偶联通常是在二氧化硅含量高的Mn矿物中发现的。但是，在使用N ₂进行OC分解并使用空气作为氧化性气体的1000°C实验中，没有发现这种效果的证据。在所有研究的材料中，锰矿石均显示出最高的反应性，在950°C，使用H ₂作为还原气体的实验中，锰矿石的速率指数为11.9％/ min 。最后，可以得出结论，二氧化硅的存在改善了锰矿石的反应性，使其成为用于原位气化化学回路燃烧（iG-CLC）技术的有前途的载体。