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Study on Reclamation of CO 2-hardened Sodium Silicate Used Sands by CaO Powder

J. Lu L. Yang J. Qian W. He H. Wang
Archives of Foundry Engineering | 2022 | vol. 22 | No 3 | 99-106 | DOI: 10.24425/afe.2022.140242
Keywords CO2 hardened sodium silicate used sands CaO reclamation Orthogonal experiment
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Abstract

Aiming at the problems of wet reclamation consuming a lot of water, dry(mechanical) reclamation having wear and power consumption, this paper to find suitable reclamation reagents to reduce the influence of harmful substances in used sodium silicate sands. By comparing the reclamation effect of CaO, Ca(OH) 2 and Ba(OH) 2 reclamation powder reagents, it was concluded that CaO had the best reclamation effect. Through the single factor experiment, the influence of CaO on the reclamation effect was explored: 1. addition amount of CaO;2. the additional amount of water ;3. reclamation time. The orthogonal results showed that the CaO reclamation effect was the best when the amount of CaO was 1.5%, the amount of sodium silicate was 4.0%, the amount of water added was 6.0%, and the reclamation time was 12.0h. In this experiment, 82.2% carbonate and 75.0 % silicate in used sands can be removed. The microscopic analysis of the reclamation sands was carried out by scanning electron microscope (SEM); The surface was relatively smooth, without large area cracks and powder accumulation. Compared with the used sands, the instant, 24h ultimate, and residual strengths of the reclaimed sands were increased by 536.5%, 458.1%, and 89.8%, respectively, which was beneficial to the reclamation of the CO2 sodium silicate used sands.
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Bibliography

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Authors and Affiliations

J. Lu
1
ORCID: ORCID
L. Yang
1
ORCID: ORCID
J. Qian
1
ORCID: ORCID
W. He
1
ORCID: ORCID
H. Wang
1
ORCID: ORCID
  1. School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430200, China

Investigation of CO2 Capture Property of CaO Sorbent in Various Molten Chloride Media with Different Operation Temperature

Sung-Wook Kim Min Ku Jeon Kirak Lee
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 3 | 1051-1055 | DOI: 10.24425/amm.2020.133216
Keywords radioactive carbon 14C CO2 capture CaO sorbent molten salt
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Abstract

CaO sorbent dissolved in chloride molten salts was investigated to identify its CO2 capture property. Various molten salt systems with different melting points (CaCl2, LiCl, LiCl-CaCl2, and LiCl-KCl) were used to control the operation temperature from 450 to 850ºC in order to determine the effect of the operation temperature on the chemical reaction between CaO and CO2. The CaO sorbent showed the best performance at 550ºC in the LiCl-CaCl2 molten salt (conversion ratio of 85.25%). This temperature is lower than typical operation temperature of the solid-state CaO sorbent (~700ºC).

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Authors and Affiliations

Sung-Wook Kim
Min Ku Jeon
Kirak Lee

Study on Recovery of Valuable Metals in Spent Lithium-Ion Batteries by Al2O3-SiO2-CaO-Fe2O3 Slag System

Tae Boong Moon Chulwoong Han Soong Keun Hyun Sung Cheol Park Seong Ho Son Man Seung Lee Yong Hwan Kim
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 983-986 | DOI: 10.24425/amm.2021.136410
Keywords Spent lithium-ion battery Smelting Al2O3-SiO2-CaO-Fe2O3 recovery slag
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Abstract

This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al2O3-SiO2-CaO-Fe2O3 slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250℃ for 30 min on the 20Al2O3-40SiO2-20CaO-20Fe2O3 (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe2O3 and Al2O3 acted as basic oxides to depolymerize SiO4 and AlO4 under the addition of critical 20 mass% Fe2O3 in 20Al2O3-40SiO2-CaO-Fe2O3 (CaO + Fe2O3 = 40 mass%). In addition, it was observed that the addition of Fe2O3 ranging between 20 and 30 mass% lowers the melting point of the slag system.
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Authors and Affiliations

Tae Boong Moon
1 2
ORCID: ORCID
Chulwoong Han
2
ORCID: ORCID
Soong Keun Hyun
1
ORCID: ORCID
Sung Cheol Park
2
ORCID: ORCID
Seong Ho Son
2
ORCID: ORCID
Man Seung Lee
3
ORCID: ORCID
Yong Hwan Kim
2
ORCID: ORCID
  1. Inha University, Department of Materials Science and Engineering, Incheon, Korea
  2. Korea Institute of Industrial Technology, Research Institute of Advanced Manufacturing and Materials Technology Incheon, 156, Gaetbeol Rd., Yeonsu-gu, Incheon, 406-840, Korea
  3. Mokpo National University, Department of Materials Science and Engineering Mokpo, Korea

Calculation of Surface Tension of Multicomponent Silicate Solutions

D. Kalisz
Archives of Foundry Engineering | 2020 | vol. 20 | No 4 | 29-35 | DOI: 10.24425/afe.2020.133344
Keywords Surface tension Nakamoto model CaO-Al2O3-SiO2 MnO-Al2O3-SiO2 system
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Abstract

Surface phenomena play a major role in metallurgical processes; their operation results, among others, from the surface tension of liquid oxidic systems. One of the methods of determining surface tension of oxidic systems is performing calculations with Butler’s method. Surface tension was calculated for two- and three-component liquid oxidic systems typical of metallurgical processes. The determined dependence of surface tension in FeO-SiO2 at temp. 1773 K and CaO-SiO2 at temp.1873 K showed that with the growing participation of SiO2 surface tension decreased. Analogous calculations were performed for three-component systems: CaO-Al2O3-SiO2 and MnO-Al2O3- SiO2. The results of calculations of surface tension were determined for temp. 1873 K and compared with the results obtained by T. Tanaka et al. [19]. In both cases the increase of Al2O3 content resulted in a growth of surface tension. The simulation results were higher than experimental result, as compared to the literature data.

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Authors and Affiliations

D. Kalisz

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