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Purification of Spherical Graphite by Alkali-Acid Method
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Wenxue ZHANG1, Yangshuai QIU1, 2, Lingyan ZHANG1, 2
Mining and Metallurgical Engineering | 2025, 45(3) : 151 - 157
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Mining and Metallurgical Engineering | 2025, 45(3): 151-157
• METALLURGY •
Purification of Spherical Graphite by Alkali-Acid Method
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Wenxue ZHANG1, Yangshuai QIU1, 2, Lingyan ZHANG1, 2
Affiliations
  • 1.School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • 2.Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan 430070, Hubei, China
Published: 2025-06-01 doi: 10.3969/j.issn.0253-6099.2025.03.025
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To address the issues of low purity and high consumption of alkali and acid during chemical purification of graphite, Luobei spherical graphite was taken to explore the occurrence state of impurities therein and to perform tests on its purification by alkali-acid method. A novel alkali-acid method was developed, which consists of stirring with alkali under negative-positive pressure and pressure acid leaching. This purification process is conducted in the following steps with the optimized conditions: firstly leave graphite in a vacuum for 35 min with vacuum degree of -0.15 MPa, and then stir for 40 min under pressure of 0.19 MPa at 120 ℃ by adding NaOH at a concentration of 40%, with NaOH solution and spherical graphite in a liquid-to-solid ratio of 1.0 mL/g；after 120 min roasting at 550 ℃, acid leaching with HCl at a concentration of 2.5 mol/L is performed under pressure of 0.16 MPa at 118 ℃ for 90 min, with HCl solution and graphite in a liquid-to-solid ratio of 1.0 mL/g. As a result, the fixed carbon content in the purified graphite is up from 95.35% to 99.96%.

spherical graphite  /  alkali-acid method  /  acid leaching  /  alkali roasting  /  graphite purification
Wenxue ZHANG, Yangshuai QIU, Lingyan ZHANG. Purification of Spherical Graphite by Alkali-Acid Method[J]. Mining and Metallurgical Engineering, 2025 , 45 (3) : 151 -157 . DOI: 10.3969/j.issn.0253-6099.2025.03.025
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Article Info
doi: 10.3969/j.issn.0253-6099.2025.03.025
  • Receive Date：2024-12-30
  • Online Date：2026-03-19
  • Published：2025-06-01
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  • Received：2024-12-30
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Affiliations
    1.School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
    2.Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan 430070, Hubei, China
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Citations
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
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
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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