Electrical conductivity of lead silicate slags with iron oxide in air

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-06-12 DOI:10.1016/j.electacta.2025.146704

Pieter-Jan Boeykens , Amy Van den Bulck , Lennart Scheunis , Inge Bellemans , Kim Verbeken

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Abstract

This study investigates the electrical conductivity and conduction mechanisms of lead silicate slags. The primary objectives were to assess the applicability of stepped potential chronoamperometry (SPC) measurements in systems with volatile components like PbO and to understand the contribution of Fe³⁺ with respect to the ionic conductivity. Experiments were carried out in a ternary SiO₂ – PbO – FeO_1.5 system (max 10 mol % FeO_1.5) between 1000 °C and 1300 °C under air to ensure that the iron cations were predominantly Fe³⁺. From the SPC measurements, it was found that the current was predominantly carried via ions. The exact electronic transference number could however not be determined as it is possible that faradaic reactions still take place at the slag-electrode interface during the SPC measurement. Regarding the total/ionic conductivity, it is found that substituting PbO and SiO₂ for FeO_1.5 results in respectively a significant decrease and increase of the slags electrical conductivity. The activation energy on the other hand was found to increase for PbO substitution, whereas it remained constant for SiO₂ substitution. This was linked to the type, number and proximity of easy cation hopping sites within the slag.

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含氧化铁的硅酸铅渣在空气中的电导率

研究了硅酸铅渣的电导率及其导电机理。主要目的是评估阶梯电位计时安培法（SPC）测量在具有挥发性组分（如PbO）的系统中的适用性，并了解Fe3+对离子电导率的贡献。实验在1000℃~ 1300℃的空气条件下，在SiO2 - PbO - FeO1.5三元体系（最大FeO1.5 mol%）中进行，以确保铁离子以Fe3+为主。从SPC测量中，发现电流主要通过离子携带。然而，准确的电子转移数无法确定，因为在SPC测量期间，法拉第反应仍可能在炉渣-电极界面发生。在总电导率和离子电导率方面，以PbO和SiO2代替FeO1.5分别显著降低和提高炉渣电导率。另一方面，PbO取代的活化能增加，而SiO2取代的活化能保持不变。这与渣中易阳离子跳位的类型、数量和邻近程度有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.