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Effect of Iron Oxide on Properties of Stabilized Magnesia Dolomite
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[1]TAO Mengya,GAO Zhengxia,LIU Wei,et al.Effect of Iron Oxide on Properties of Stabilized Magnesia Dolomite[J].Journal of Zhengzhou University (Engineering Science),2023,44(04):101-106.[doi:10.13705/j.issn.1671-6833.2023.01.012]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 04 Page number: 101-106 Column: Public date: 2023-06-01
Title:
Effect of Iron Oxide on Properties of Stabilized Magnesia Dolomite
Author(s):
TAO Mengya1; 2; GAO Zhengxia1; 2; LIU Wei1; 2; LI Xiang1; 2; GUO Xiaoteng1; 2; SUO Dong3; TIAN Shishuai3; MA Chengliang1; 2
School of Materials Science and Engineering, Zhengzhou University, 450001, Zhengzhou, Henan, Key Laboratory of High -temperature functional materials in Henan Province, Zhengzhou 450052, Henan, Sanmenxia Electric Power Morality Co., Ltd., Henan Sanmenxia 472400

Keywords:
iron oxide;  stabilized magnesia dolomite;  hydration resistance;  coatability adherence;  physical properties
CLC:
TQ175.7
DOI:
10.13705/j.issn.1671-6833.2023.01.012
Abstract:
In order to improve the performance of magnesia dolomite materials, stabilized magnesium dolomite refractory materials whose iron oxide content ( mass fraction) was 0, 0. 5%, 1. 0%, 1. 5%, respectively, were prepared from natural dolomite, high silicon magnesite, silica and iron oxide powder by two-stage calcination and slaking process. The influence of iron oxide content on the physical properties, hydration resistance and coatability adherence of the samples was investigated. The phase composition and microstructure of the specimens were characterized. The results show that, as the iron oxide content increases, the room temperature flexural strength and the room temperature compressive strength increase, the high temperature flexural strength and the adherence strength decrease, and the retention rate of the thermal shock strength of the sample first increases and then decreases. With the iron oxide content increasing to 1. 5%, the hydration weight gain rate of the sample decreases to 0. 12%, and the hydration resistance improves. According to the XRD spectrum analysis, the main crystal phases of the sample are periclase, dicalcium silicate and tricalcium silicate. With the increase of iron oxide content, the diffraction peaks of C2 S and C3 S become stronger and the peak shapes are sharp. It shows that iron oxide can promote the growth of C2 S and C3 S crystals and increase the density of the sample.
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