scholarly journals Experimental Study on Precipitation Behavior of Spinels in Stainless Steel-Making Slag under Heating Treatment

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 487 ◽  
Author(s):  
Jianli Li ◽  
Qiqiang Mou ◽  
Qiang Zeng ◽  
Yue Yu
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Steel Slag ◽  
Calcium Content ◽  
Heating Time ◽  
X Ray Diffraction ◽  
Stainless Steel Slag ◽  
Steel Making ◽  
Heating Treatment ◽  
The Stability

The stability of chromium in stainless steel slag has a positive correlation with spinel particle size and a negative correlation with the calcium content of the spinel. The effect of heating time on the precipitation of spinel crystals in the CaO-SiO2-MgO-Al2O3-Cr2O3-FeO system was investigated in the laboratory. Scanning electron microscopy with energy-dispersive and X-ray diffraction were adopted to observe the microstructure, test the chemical composition, and determine the mineral phases of synthetic slags, and FactSage7.1 was applied to calculate the crystallization process of the molten slag. The results showed that the particle size of the spinel crystals increased from 9.42 to 10.73 μm, the calcium content in the spinel crystals decreased from 1.38 at% to 0.78 at%, and the content of chromium in the spinel crystal increased from 16.55 at% to 22.78 at% with an increase in the heating time from 0 min to 120 min at 1450 °C. Furthermore, the species of spinel minerals remained constant. Therefore, an extension in the heating time is beneficial for improving the stability of chromium in stainless steel slag.

Analysis on the stability of chromium in mineral phases in stainless steel slag

2017 ◽  
Vol 115 (1) ◽  
pp. 114 ◽  
Author(s):  
Long-hu Cao ◽  
Cheng-jun Liu ◽  
Qing Zhao ◽  
Mao-fa Jiang
Keyword(s):  
Aqueous Solution ◽  
Stainless Steel ◽  
Spinel Phase ◽  
Steel Slag ◽  
Dicalcium Silicate ◽  
Limiting Factor ◽  
Leaching Test ◽  
Stainless Steel Slag ◽  
Mineral Phases ◽  
The Stability

Stainless steel slag from high alloy steel is hardly used in the construction industry. The chromium leaching in unstable phase is the limiting factor for the application in the slag. The aim of this study is to investigate the stability of mineral phases in stainless steel slag. In this work, the mineral phases were firstly confirmed through experimental results by SEM-EDS and XRD. Thermodynamic calculation and leaching test were adopted to characterize the theoretical stability of mineral phases in aqueous solution. The results showed that the main phases in the stainless steel slag were spinel, melilite [solid solution of gehlenite (Ca2Al2SiO7) and akermanite (Ca2MgSi2O7)], dicalcium silicate, merwinite and periclase phases. It can be concluded that the minerals behave differently when dissolving in aqueous solution and the dissolution of dicalcium silicate (Ca2SiO4), merwinite (Ca3MgSi2O8), akermanite (Ca2MgSi2O7) and periclase phase could be generally higher, especially at lower pH values. In addition, the solubility of chromium in the spinel phase is considered low. The leaching test demonstrated that the formation of spinel phase can limit the leaching of chromium and the chromium existing in the silicate and periclase phases can facilitate the chromium leaching.

scholarly journals Influence of particle size on the carbonation of stainless steel slag for CO2 storage

2009 ◽  
Vol 1 (1) ◽  
pp. 4859-4866 ◽  
Author(s):  
Renato Baciocchi ◽  
Giulia Costa ◽  
Alessandra Polettini ◽  
Raffaella Pomi
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Co2 Storage ◽  
Steel Slag ◽  
Stainless Steel Slag

scholarly journals Effect of Lime on Stability of Chromium in Stainless Steel Slag

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 424 ◽  
Author(s):  
Qing Zhao ◽  
Chengjun Liu ◽  
Longhu Cao ◽  
Xiang Zheng ◽  
Maofa Jiang
Keyword(s):  
Stainless Steel ◽  
Phase Transformation ◽  
Layer Structure ◽  
Steel Slag ◽  
Product Layer ◽  
Dicalcium Silicate ◽  
Slag Basicity ◽  
Stainless Steel Slag ◽  
Living Organisms ◽  
The Stability

The stabilization of chromium is of great importance to the use of stainless steel slag (SSS), and the influence of lime on the stability of chromium is currently unclear. In this work, the variation of phase transformation and chromium distribution with slag basicity (CaO/SiO2) were investigated experimentally, and the leaching ability of chromium was evaluated. Results showed that chromium-bearing phases were glass, dicalcium silicate (C2S), spinel, and periclase, while the degree of enrichment of chromium in these phases was found to be closely related to the basicity. The optimal basicity obtained in this research was 1.5, with the chromium mainly present in the stable spinel and exhibiting the lowest leaching ability. The product layer structure of unmelted lime was studied as well, showing a periclase layer and a Ca2SiO4 layer. Some CaCr2O4 had formed in the periclase layer, which is potentially hazardous for the environment and living organisms.

scholarly journals Effect of binary basicity on chromium occurrence in stainless steel slag

2021 ◽  
pp. 43-43
Author(s):  
Q. Zeng ◽  
J.-L. Li ◽  
G.-J. Ma ◽  
H.-Y. Zhu
Keyword(s):  
Stainless Steel ◽  
Steel Slag ◽  
Calcium Content ◽  
Synthetic Slag ◽  
Leaching Behavior ◽  
Stainless Steel Slag ◽  
Comprehensive Utilization ◽  
Precipitation Occurrence ◽  
The Relationship ◽  
Lower Basicity

Comprehensive utilization of stainless-steel slag (SSS) is restrained due to the risk of Cr6+ leaching. Based on the studying the microstructure of synthetic slag (SS) containing Cr2O3with XRD, SEM-EDS?and Image pro, the effect of binary basicity on the chromium occurrence in SSS was investigated. The results indicated that the binary basicity had a significant impact on the properties of spinel crystals. There was a positive correlation between the calcium content in spinel crystals and the SS basicity. The size of spinel crystals varied from large to small and the precipitation occurrence changed with the basicity increase. Furthermore, the chromium occurrences changed with basicity. The chromium was produced in spinel crystals at lower basicity, but as the basicity increased to 3.0, the chromium precipitated as calcium chromate. In view of the relationship between the chromium leaching behavior and its occurrence, increasing basicity raised the Cr6+ leaching.

scholarly journals Stability of Chromium in Stainless Steel Slag during Cooling

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 445 ◽  
Author(s):  
Qing Zhao ◽  
Chengjun Liu ◽  
Longhu Cao ◽  
Xiang Zheng ◽  
Maofa Jiang
Keyword(s):  
Stainless Steel ◽  
Molten Slag ◽  
Steel Slag ◽  
Dicalcium Silicate ◽  
Cooling Process ◽  
Stainless Steel Slag ◽  
Chromium Release ◽  
Elution Behavior ◽  
The Stability ◽  
Chromium Enrichment

The chromium elution behavior of stainless steel (SS) slag depends highly on the chromium distribution, and the molten modification process proved to effectively improve the chromium enrichment in stable phases. However, the phase transformation and variation of chromium stability during the subsequent cooling process is still poorly understood. In this work, the phase composition and chromium distribution of SS slag from different quenching temperatures were experimentally studied, and the stability of chromium-bearing phases was evaluated using standard leaching tests. The results indicated that dicalcium silicate and spinel phases had formed in the molten slag at 1600 °C, while the dicalcium silicate disappeared and the phases of merwinite and melilite precipitated when the temperature decreased from 1600 to 1300 °C (at a rate of 5 °C/min). During this cooling process, the chromium migrated from other phases into the spinel, significantly suppressing the chromium elution. The leaching results also demonstrated that the potential chromium-bearing phases of glass, dicalcium silicate and merwinite are unstable and are presumably the main source of chromium release. The treated SS slag meets the requirements for the utilization of chromium-bearing slag in the cement and brick industries.

Stabilization of Stainless Steel Slag via Air Granulation

2019 ◽  
Vol 5 (2) ◽  
pp. 157-171 ◽  
Author(s):  
Mikael Lindvall ◽  
Lily Lai Chi So ◽  
Mahdi Mahdi ◽  
Janice Bolen ◽  
Johannes Nell ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Steel Slag ◽  
Stainless Steel Slag

Crystallization mechanism of glass-ceramics prepared from stainless steel slag

Rare Metals ◽  
2018 ◽  
Vol 37 (5) ◽  
pp. 413-420 ◽  
Author(s):  
Wen-Di Fan ◽  
Qiang-Wei Yang ◽  
Bin Guo ◽  
Bo Liu ◽  
Shen-Gen Zhang
Keyword(s):  
Stainless Steel ◽  
Steel Slag ◽  
Glass Ceramics ◽  
Crystallization Mechanism ◽  
Stainless Steel Slag
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