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Mechanism and Process Optimization of Removing Calcium and Silicon Impurities from Chlorinated Slag by NaOH
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Yaqi ZHANG1, Yongdong HE1, Huanghe WANG2, Feilong LIANG2
Mining and Metallurgical Engineering | 2025, 45(4) : 115 - 121
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Mining and Metallurgical Engineering | 2025, 45(4): 115-121
• METALLURGY •
Mechanism and Process Optimization of Removing Calcium and Silicon Impurities from Chlorinated Slag by NaOH
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Yaqi ZHANG1, Yongdong HE1, Huanghe WANG2, Feilong LIANG2
Affiliations
  • 1.School of Materials Science and Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China
  • 2.Xinjiang Xiangrun New Materials Co., Ltd., Hami 839000, Xinjiang, China
Published: 2025-08-01 doi: 10.3969/j.issn.0253-6099.2025.04.021
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To explore the removal mechanism of silicon and calcium and optimize the process, simulated chlorinated slag composed of silicon dioxide, calcium chloride and sodium chloride, was used as raw material in an experiment, with sodium hydroxide as an additive. The calcium and silicon ions were converted into high-melting-point solid phases, which were separated from the sodium chloride salt solution by filtration, thereby realizing regeneration and comprehensive utilization of the sodium chloride salt solution. Based on thermodynamic analysis, kinetic analysis, TG-DSC, XRD, ICP, SEM-EDS among other analysis measures, the conversion at high temperatures and removal mechanisms for calcium and silicon impurities, as well as the separation process of NaCl were all systematically explored. Thermodynamic analysis shows that a conversion can proceed spontaneously at temperatures ranging from 973 K to 1473 K. Fitting with the Kissinger method shows that the activation energy of the conversion at high temperatures is 296.21 kJ/mol, and the pre-exponential factor is 8.46×1010 s－1. The experimental results indicate that with calcium-silicon impurities and sodium hydroxide in a mass ratio of 1∶0.6, separation by filtration at 1 123 K can lead to the removal rates of calcium and silicon up to 86.66% and 99.60%, respectively.

thermodynamic analysis  /  sodium hydroxide  /  calcium and silicon impurities  /  high-temperature conversion  /  recycling and utilization  /  molten salt chlorination slag  /  NaCl
Yaqi ZHANG, Yongdong HE, Huanghe WANG, Feilong LIANG. Mechanism and Process Optimization of Removing Calcium and Silicon Impurities from Chlorinated Slag by NaOH[J]. Mining and Metallurgical Engineering, 2025 , 45 (4) : 115 -121 . DOI: 10.3969/j.issn.0253-6099.2025.04.021
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Year 2025 volume 45 Issue 4
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Article Info
doi: 10.3969/j.issn.0253-6099.2025.04.021
  • Receive Date：2025-02-15
  • Online Date：2026-03-05
  • Published：2025-08-01
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  • Received：2025-02-15
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    1.School of Materials Science and Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China
    2.Xinjiang Xiangrun New Materials Co., Ltd., Hami 839000, Xinjiang, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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