Regular Article

Research on corrosion mechanism of refractory lining in drip zone of COREX melting gasifier

¹ Department of Metallurgy and Environmental Engineering, Shanxi Engineering Vocational College, Taiyuan 030009, PR China
² Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, PR China
³ College of Metallurgy, Northeastern University, Shenyang 110819, PR China
⁴ Zhiqi Railway Equipment Co., Ltd., Taiyuan 030032, PR China
⁵ Hbis Group Hansteel Company, Handan 056001, PR China

^* e-mail: 731536257@qq.com

Received: 1 December 2019
Accepted: 14 April 2021

Abstract

In this paper, the COREX-3000 melting gasifier was dissected and sampled to obtain the macroscopic erosion appearance of refractories lining in the drip zone, and the erosion behavior and mechanism of refractory bricks in the drip zone were analyzed by means of chemical analysis, XRD, SEM and determination of physical characteristics. The results showed that the maximum average erosion of refractory lining bricks in the drip zone was 220 mm and the erosion rate was up to 69%. Its surface was mainly affected by slag erosion and mechanical scour of slag, but at high temperature, the surface of refractory could be re-sintered, forming a protective layer, which improved the volume density and high compressive strength of refractory, which was advantageous to the improvement of refractory brick slag resistance invasion and mechanical erosion resistance. Relevant research results can provide theoretical basis for the selection of refractories lining in the drip zone of COREX melting gasifier.