Towards a low-emission resource circulation of valuable metals from municipal solid waste incineration fly ash

被引:1
|
作者
Srivastava, Rajiv Ranjan [1 ,2 ]
Nandikes, Gopa [3 ]
Ilyas, Sadia [4 ,5 ]
Pathak, Pankaj [3 ]
Rajak, Dilip Kumar [6 ]
机构
[1] Duy Tan Univ, Inst Res & Dev, Ctr Adv Chem, Da Nang 550000, Vietnam
[2] Duy Tan Univ, Fac Nat Sci, Resource Management, Da Nang 550000, Vietnam
[3] SRM Univ AP, Dept Environm Sci & Engn, Resource Management Lab, Amaravati 522502, Andhra Prades, India
[4] Hanyang Univ, Dept Earth Resources & Environm Engn, Seoul 04763, South Korea
[5] Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Proc Met, S-97187 Lulea, Sweden
[6] Kathmandu Univ, Dept Chem Sci & Engn, Dhulikhel 45200, Nepal
关键词
MSW fly ash; Metal recycling; Ion-exclusion leaching; Solvent extraction; Life cycle analysis; HEAVY-METALS; RECOVERY; EXTRACTION;
D O I
10.1016/j.scitotenv.2024.172657
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The incineration fly ash (IFA) resulting from municipal solid waste combustion is laden with heavy metals, necessitating proper treatment not only for environmental management but also to reclaim the metal values. The surge in non-traditional metals like cobalt as emerging contaminant within IFA samples further attracts to address this issue. In response, the hydrometallurgical recycling of a cobalt -bearing IFA has been studied. Thereby, approximately 98 % zinc and 96 % cobalt were leached using a 1.0 mol/L H 2 SO 4 solution at 90 degrees C and 1 h of leaching time. In-depth analysis of the leaching process unveiled metals' dissolution primarily via the ionexclusion mechanism, as evidenced by lower diffusion coefficients (between 10 -9 and 10 -11 m 2 /s) and activation energies (9.6 - 14.9 kJ/mol). Above 99 % separation of zinc from the cobalt -bearing leach liquor was achieved by extraction with 1.0 mol/L D2EHPA at an equilibrium pH below 3.0, followed by stripping with a 2.0 mol/L H 2 SO 4 solution. Cobalt, remained in the raffinate was efficiently precipitated by adding a 20 % excess dosage of oxalic acid to the stoichiometric ratio of C 2 O 4 2- :Co 2+ , resulting in only 5 mg/L cobalt left in the solution when precipitation occurred at a pH of 2.8. Additionally, the conversion of CoC 2 O 4 to high -purity Co 3 O 4 was conducted through heat -treatment at 600 degrees C. The resulting Co 3 O 4 was mixed with Li 2 CO 3 at a Li/Co molar ratio of 1.1, yielding a LiCoO 2 precursor that exhibited good electrochemical properties with a capacity of 128 mAh/g, thus affirming the high quality of the recycled cobalt. A comprehensive life -cycle assessment of the recycling process revealed that cobalt precipitation alone contributes approximately 50 % of the total global warming potential (GWP = 4.2624 kg CO 2 -eq). Notably, this value is remarkably lower than the GWP reported for primary cobalt production, highlighting the environmentally -friendly approach of this recycling endeavor.
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页数:13
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