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Experimental Study on Synergistic Leaching of Lithium and Aluminum from Coal Ash by Ammonium Sulfate Roasting - Water Leaching
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Shixiong XU1, 2, Lin WU1, 3, Fangjun ZHONG1, 3, Xi LI1, 3, Ping REN1, 3, Xingfa LUO1, 3, Jiangguo CHENG2, Lei DONG1, Jing WU1
Mining and Metallurgical Engineering | 2026, 46(4) : 183 - 189
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Mining and Metallurgical Engineering | 2026, 46(4): 183-189
• METALLURGY •
Experimental Study on Synergistic Leaching of Lithium and Aluminum from Coal Ash by Ammonium Sulfate Roasting - Water Leaching
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Shixiong XU1, 2, Lin WU1, 3, Fangjun ZHONG1, 3, Xi LI1, 3, Ping REN1, 3, Xingfa LUO1, 3, Jiangguo CHENG2, Lei DONG1, Jing WU1
Affiliations
  • 1.Laboratory of Guizhou Provincial Coalfield Geology Bureau, Guiyang 550016, Guizhou, China
  • 2.College of Mining, Guizhou University, Guiyang 550025, Guizhou, China
  • 3.Guizhou Academician Workstation for Precise Exploitation of Valuable Mineral Resources and Environmental Protection, Guiyang 550016, Guizhou, China
doi: 10.3969/j.issn.0253-6099.2026.04.028
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Ammonium sulfate roasting - water leaching process was adopted to synergistically leach lithium and aluminum from coal ash, and the effects of mass ratio of ammonium sulfate to fly ash, roasting temperature, roasting time, liquid-to-solid ratio, leaching temperature and leaching time on leaching rates of lithium and aluminum were also investigated. The results show that under the optimized conditions:ammonium sulfate and fly ash in a mass ratio of 4∶1, roasting temperature of 400 ℃, roasting time of 2 h, liquid-to-solid ratio of 4∶1, leaching temperature of 80 ℃ and leaching time of 30 min, the leaching rates of lithium and aluminum reach 86.77% and 78.04%, respectively. Mechanism analysis indicates that mullite, the host phase of lithium, reacts with ammonium bisulfate (the thermal decomposition product of ammonium sulfate) at 400 ℃ to generate soluble ammonium aluminum sulfate and aluminum sulfate, resulting in destruction of mullite crystal structure. After being released, lithium reacts with ammonium bisulfate to form lithium sulfate, which enters the aqueous phase during water leaching, thus realizing efficient synergistic leaching of lithium and aluminum.

coal ash  /  ammonium sulfate roasting  /  water leaching  /  lithium  /  aluminum  /  synergistic leaching  /  fly ash
徐世雄, 吴林, 钟方军, 李熹, 任平, 罗兴发, 成奖国, 董蕾, 武静. 硫酸铵焙烧-水浸法从煤灰中协同浸出锂、铝试验研究. 矿冶工程杂志, 2026 , 46 (4) : 183 -189 . DOI: 10.3969/j.issn.0253-6099.2026.04.028
Shixiong XU, Lin WU, Fangjun ZHONG, Xi LI, Ping REN, Xingfa LUO, Jiangguo CHENG, Lei DONG, Jing WU. Experimental Study on Synergistic Leaching of Lithium and Aluminum from Coal Ash by Ammonium Sulfate Roasting - Water Leaching[J]. Mining and Metallurgical Engineering, 2026 , 46 (4) : 183 -189 . DOI: 10.3969/j.issn.0253-6099.2026.04.028
Appendix
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Year 2026 volume 46 Issue 4
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doi: 10.3969/j.issn.0253-6099.2026.04.028
  • Receive Date：2026-01-28
  • Online Date：2026-10-08
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  • Received：2026-01-28
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Affiliations
    1.Laboratory of Guizhou Provincial Coalfield Geology Bureau, Guiyang 550016, Guizhou, China
    2.College of Mining, Guizhou University, Guiyang 550025, Guizhou, China
    3.Guizhou Academician Workstation for Precise Exploitation of Valuable Mineral Resources and Environmental Protection, Guiyang 550016, Guizhou, 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
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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