Assessment of copper and zinc recovery from MSWI fly ash in Guangzhou based on a hydrometallurgical process
Artikel i vetenskaplig tidskrift, 2018

Fly ash commonly accumulates a significant amount of heavy metals and most of these heavy metals are toxic and easily leached out to the environment, posing risks to human health. Thus, fly ash has been classified as a type of hazardous waste and requires proper treatment before disposal in specific landfill sites for hazardous waste. In this study, a hydrometallurgical process developed to recover copper and zinc performed in pilot scale close to industrial scale followed by a landfill compliance leaching test of the ash residue is evaluated. LIX860N-I and Cyanex 572 gave high selectively for extractions, a yield efficiency of 95% and 61% was achieved for copper and zinc respectively. Results of pilot experiments reveals that the combining metal recovery recycling and landfill disposal of the ash residue in a local regular landfill was demonstrated to be a technically and economically effective strategy. Specifically, the economic and environmental aspects of a scenario, in which the fly ash generated in Guangzhou is processed were systematically assessed. the assessment results show that a 7.15 million US$ of total expense reduction, a less energy cost of 19k GJ as well as 2100 tons less CO2 emissions could be achieved annually comparing to the current alternative, direct disposal of the fly ash as hazardous waste. The results reveal that the hydrometallurgical process has industrial application potential on both economic and environmental aspects and further optimization of the process can give more accurate assessment of the cost and environment effect. In addition, leaching tests and evaluation of solid residue according to the regulations specific to the country should be studied in future.

Process assessment

Fly ash

Metal recovery

MSW incineration

Zinc

Copper

Författare

Jinfeng Tang

Chalmers, Kemi och kemiteknik, Energi och material, Kärnkemi

Minhua Su

Guangzhou University

Hongguo Zhang

Guangzhou University

Tangfu Xiao

Guangzhou University

Yu Liu

Guangzhou University

Yifan Liu

Taiyuan University of Technology

Lezhang Wei

Guangzhou University

Christian Ekberg

Chalmers, Kemi och kemiteknik, Energi och material, Kärnkemi

Britt-Marie Steenari

Chalmers, Kemi och kemiteknik, Energi och material, Kärnkemi

Waste Management

0956-053X (ISSN)

Vol. 76 225-233

Ämneskategorier

Oorganisk kemi

Förnyelsebar bioenergi

Miljöledning

DOI

10.1016/j.wasman.2018.02.040

PubMed

29510946

Mer information

Senast uppdaterat

2018-09-13