RECOVERY OF CALCIUM CARBONATE AFTER EXTRACTING CALCIUM SALT FROM FLY ASH OF MUNICIPAL SOLID WASTE INCINERATION

LI Mei; HE Xuelian; FENG Yanping; LIU Jian

doi:10.13205/j.hjgc.202211026

Volume 40 Issue 11

Nov. 2022

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LI Mei, HE Xuelian, FENG Yanping, LIU Jian. RECOVERY OF CALCIUM CARBONATE AFTER EXTRACTING CALCIUM SALT FROM FLY ASH OF MUNICIPAL SOLID WASTE INCINERATION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 182-188,198. doi: 10.13205/j.hjgc.202211026

Citation:

LI Mei, HE Xuelian, FENG Yanping, LIU Jian. RECOVERY OF CALCIUM CARBONATE AFTER EXTRACTING CALCIUM SALT FROM FLY ASH OF MUNICIPAL SOLID WASTE INCINERATION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 182-188,198. doi: 10.13205/j.hjgc.202211026

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RECOVERY OF CALCIUM CARBONATE AFTER EXTRACTING CALCIUM SALT FROM FLY ASH OF MUNICIPAL SOLID WASTE INCINERATION

doi: 10.13205/j.hjgc.202211026

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 2022-01-05
Available Online: 2023-03-24

Abstract

Abstract

After leaching calcium from fly ash of municipal solid waste incineration with ammonium chloride solution, the carbonization method was used to recover calcium carbonate from the leaching solution. The optimal conditions for leaching calcium ion after single factor experiment and response surface design were as follows:ammonium chloride concentration=3.9 mol/L, reaction time=64 min, liquid-solid ratio=5.6 mL/g; the degree of influence of the three factors on the leaching of calcium ions was in the order of liquid-solid ratio>ammonium chloride concentration>reaction time.The results of metal toxicity leaching from fly ash residues showed that the leaching concentration of Pb、Cu、Zn、Cd、Ni were 0.0929,0.0012,0.0054,0.0017, 0.0002 mg/L, respectively, which were significantly lower than the maximum permissible emission concentration limit stipulated in GB 8978-1996 Integrated Wastewater Discharge Standard. And the heavy metal toxicity leaching results of fly ash residues met the comprehensive utilization requirements of Term 6.3 in HJ 1134-2020 Technical Specification for Pollution Control of Fly-ash from Municipal Solid Waste Incineration. After using homemade PAN-PEI to adsorb heavy metals in the salt wash, the recycled calcium carbonate was of excellent quality. Its main crystal type is vaterite, and the contents of Pb, Cd, and Fe were 0.0009%, 0.0002%, and 0.0103%, respectively, in line with HG/T 2776-2010 Fine Precipitated Calcium Carbonate and Fine Activated Precipitated Calcium Carbonate for Industrial Use standard requirements, showing a wide range of application potential.
- fly ash,
- ammonium chloride,
- heavy metal,
- calcium ion,
- calcium carbonate

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References(32)

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