In this study, a comprehensive investigation was carried out on the effects of environmental condition on physical and chemical properties of Cold-Briquetted Iron and Carbon (CBIC), Cold Direct Reduced Iron (CDRI), and Hot-Briquetted Iron (HBI). The results showed that cold briquetting of CDRI decreases its specific surface area by 51%, which has a significant effect on its oxidation resistance and mechanical strength. Microscopic observations revealed that the oxidation products are formed in near-surface porosities during aging, which protects the fresh material underneath from environmental oxidants, resulting in retarding further oxidation. The oxidation behavior of the samples showed that after about 2 months, the metallization degree-loss rate undergoes a big change because of the transition of the oxidation mechanism from reaction-control to diffusion-control condition. Comparing the oxidation behaviors of samples demonstrated that cold briquetting of CDRI with molasses and sodium silicate binders improves its oxidation resistance by 55% and 65%, respectively. The crushing strength of CBIC with sodium silicate binder in the humid medium reached a steady-state condition after 7 days from beginning of aging. But, the crushing strength of CBIC with molasses was significantly affected by the environmental humidity, so that after 7 days its strength decreased.

中文翻译：

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冷压铁和碳（CBIC）：环境条件对其化学和物理性质的影响的研究

在这项研究中，对环境条件对冷球铁和碳（CBIC），冷直接还原铁（CDRI）和热球铁（HBI）的物理和化学性质的影响进行了全面调查。结果表明，CDRI的冷压块使其比表面积降低了51％，这对其抗氧化性和机械强度产生了显着影响。显微镜观察表明，在老化过程中，氧化产物形成在近表面的孔隙中，这保护了下面的新鲜材料免受环境氧化剂的侵蚀，从而阻止了进一步的氧化。样品的氧化行为表明，约2个月后，由于氧化机理从反应控制向扩散控制的转变，金属化程度的损失率发生了很大的变化。比较样品的氧化行为表明，用糖蜜和硅酸钠粘合剂对CDRI进行冷团块处理可将其抗氧化性分别提高55％和65％。老化开始后7天，在潮湿介质中CBIC与硅酸钠粘合剂的抗碎强度达到稳态。但是，CBIC的糖蜜压碎强度受环境湿度的影响很大，因此7天后其强度下降。比较样品的氧化行为表明，用糖蜜和硅酸钠粘合剂对CDRI进行冷团块处理可将其抗氧化性分别提高55％和65％。老化开始后7天，在潮湿介质中CBIC与硅酸钠粘合剂的抗碎强度达到稳态。但是，CBIC的糖蜜压碎强度受环境湿度的影响很大，因此7天后其强度下降。比较样品的氧化行为表明，用糖蜜和硅酸钠粘合剂对CDRI进行冷团块处理可将其抗氧化性分别提高55％和65％。老化开始后7天，在潮湿介质中CBIC与硅酸钠粘合剂的抗碎强度达到稳态。但是，CBIC的糖蜜压碎强度受环境湿度的影响很大，因此7天后其强度下降。