Abstract This paper evaluates the reactivity of individual mineral phases of ferronickel slag (FNS) based on the backscattered electron images analysis (BSE-IA) and presents the leaching kinetics of FNS in NaOH solutions, aiming to reveal the interrelationships among physicochemical properties, leaching behavior and reactivity of FNS. There are three typical phases identified in water-quenched FNS, namely FNS I, II and III phase. The FNS I phase is more prone to dissolve and preferentially participate in the reaction process than the other two phases. The dissolved Mg from FNS is mainly involved in the formation of hydrotalcite and N-M-S-H gels. Cr could not be detected during the leaching process. The activation energy for the leaching of Si and Al is 80.47 and 49.45 kJ/mol, respectively. A method for rapid evaluation of the reaction activity of FNS given the evaluation index of the individual leaching ratio of Si and Al is proposed.

中文翻译：

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碱性条件下镍铁渣浸出动力学及反应性评价

摘要 本文基于背散射电子图像分析 (BSE-IA) 评估了镍铁渣 (FNS) 各个矿物相的反应性，并介绍了 FNS 在 NaOH 溶液中的浸出动力学，旨在揭示其理化性质、浸出行为之间的相互关系。和 FNS 的反应性。在水淬 FNS 中确定了三个典型的相，即 FNS I、II 和 III 相。FNS I 相比其他两相更容易溶解并优先参与反应过程。FNS中溶解的Mg主要参与水滑石和NMSH凝胶的形成。在浸出过程中无法检测到 Cr。Si和Al浸出的活化能分别为80.47和49.45 kJ/mol。