Research on the Properties of Steel Slag with Different Preparation Processes

Author:

Liu Xingbei1ORCID,Zhang Chao1ORCID,Yu Huanan1ORCID,Qian Guoping1,Zheng Xiaoguang2,Zhou Hongyu1ORCID,Huang Lizhang1,Zhang Feng1,Zhong Yixiong1ORCID

Affiliation:

1. School of Traffic and Transportation Engineering, National Engineering Research Center of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China

2. Shanghai Municipal Engineering Design & Research Institute (Group) Co., Ltd., Shanghai 200092, China

Abstract

To promote the resource utilization of steel slag and improve the production process of steel slag in steelmaking plants, this research studied the characteristics of three different processed steel slags from four steelmaking plants. The physical and mechanical characteristics and volume stability of steel slags were analyzed through density, water absorption, and expansion tests. The main mineral phases, morphological characteristics, and thermal stability of the original steel slag and the steel slag after the expansion test are analyzed with X-ray diffractometer (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TG) tests. The results show that the composition of steel slag produced by different processes is similar. The main active substances of other processed steel slags are dicalcium silicate (C2S), tricalcium silicate (C3S), CaO, and MgO. After the expansion test, the main chemical products of steel slag are CaCO3, MgCO3, and calcium silicate hydrate (C-S-H). Noticeable mineral crystals appeared on the surface of the steel slag after the expansion test, presenting tetrahedral or cigar-like protrusions. The drum slag had the highest density and water stability. The drum slag had the lowest porosity and the densest microstructure surface, compared with steel slags that other methods produce. The thermal stability of steel slag treated by the hot splashing method was relatively higher than that of steel slag treated by the other two methods.

Funder

the 2022 National College Students’ Innovative Entrepreneurial Training Plan Program

The National Natural Science Foundation of China

the Science and Technology Innovation Program of Hunan Province

the Postgraduate Scientific Research Innovation Project of Hunan Province

Publisher

MDPI AG

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