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Optimization of Fly Ash Dealumination Process by Response Surface Method
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Xiangdong XING, Mingxiao ZHANG, Yuxing WANG, Penghui GUO
Hydrometallurgy of China | 2026, 45(4) : 521 - 529
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Hydrometallurgy of China | 2026, 45(4): 521-529
• Experiment Research •
Optimization of Fly Ash Dealumination Process by Response Surface Method
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Xiangdong XING, Mingxiao ZHANG, Yuxing WANG, Penghui GUO
Affiliations
  • School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an　710055, China
Published: 2026-08-20 doi: 10.13355/j.cnki.sfyj.2026.04.008
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Extraction of aluminum from fly ash by ammonium sulfate roasting-leaching process was studied. The effects of roasting temperature, roasting time and the molar ratio of ammonium sulfate to Al2O3 in fly ash on the extraction of aluminum from fly ash were investigated. The interaction of various factors on the extraction rate of aluminum from fly ash was discussed by response surface method, and the optimum roasting parameters were determined. The phase and microstructure of fly ash raw materials and calcined products were characterized by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The results show that the main product of fly ash activated by ammonium sulfate is NH4Al(SO4)2, and the surface of the roasted product is corroded. The optimum process parameters of activation roasting of fly ash are as follows：roasting temperature is 438 ℃, roasting time is 63.8 min, molar ratio of ammonium sulfate to Al2O3 in fly ash is 7.31. Under the optimum process conditions, the leaching rate of Al is 95.30%, and the leaching effect is better.

fly ash  /  activation roasting  /  response surface method  /  aluminum  /  leaching  /  optimization
Xiangdong XING, Mingxiao ZHANG, Yuxing WANG, Penghui GUO. Optimization of Fly Ash Dealumination Process by Response Surface Method[J]. Hydrometallurgy of China, 2026 , 45 (4) : 521 -529 . DOI: 10.13355/j.cnki.sfyj.2026.04.008
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Year 2026 volume 45 Issue 4
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Article Info
doi: 10.13355/j.cnki.sfyj.2026.04.008
  • Receive Date：2026-02-03
  • Online Date：2026-09-11
  • Published：2026-08-20
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  • Received：2026-02-03
  • Revised：2026-04-07
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    School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an　710055, 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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