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首页> 外文期刊>ISIJ international >Swelling Behaviour of Cement-bonded Briquettes-proposed Model
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Swelling Behaviour of Cement-bonded Briquettes-proposed Model

机译：水泥粘结团块模型的溶胀行为

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摘要

The cement-bonded agglomeration process is an alternative to the traditional balling-sintering process for recycling iron-rich by-products generated in iron and steel plants back to the blast furnaces. It has been observed that, under certain conditions, the briquettes containing pellet-fines show a tendency to swell catastrophically when reduced. This swelling is dependent upon a number of factors like: reducing temperature, composition of briquettes, particle size of raw material, amount of cement and composition of reducing gas. The SEM and optical micrographs do not show the formation of iron whiskers as the cause of swelling; instead, the swelling is due to the movement of reduced iron particles away from each other. It has been proposed that the swelling takes place in three steps: (a) fragmentation of weak pellet-fines particles during reduction to wustite; (b) formation of liquid slag due to reaction between CaO, MgO, FeO, SiO_2 and Al_2O_3; (c) generation of high gas pressure due to formation and subsequent oxidation of metastable iron carbide.
机译：水泥粘结的附聚工艺是传统球磨烧结工艺的替代方法，可将钢铁厂中产生的富铁副产品循环回高炉。已经观察到，在某些条件下，包含团粒细粉的团块在还原时显示出灾难性膨胀的趋势。这种膨胀取决于许多因素，例如：还原温度，团块的组成，原料的粒径，水泥的量和还原气体的组成。 SEM和光学显微照片未显示铁须的形成是溶胀的原因。相反，溶胀是由于还原的铁颗粒彼此远离而运动。已经提出溶胀是通过三个步骤进行的：（a）在还原成铁矾体的过程中弱的粒状细颗粒破碎。 （b）由于CaO，MgO，FeO，SiO_2和Al_2O_3之间的反应而形成的液态渣； （c）由于亚稳碳化铁的形成和随后的氧化而产生高气压。

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