scholarly journals Assessment of efficiency of rare earth elements recovery from lignite coal combustion ash via five-stage extraction

2021 ◽  
Vol 53 (2) ◽  
pp. 169-185
Author(s):  
Ljiljana Milicic ◽  
Anja Terzic ◽  
Lato Pezo ◽  
Nevenka Mijatovic ◽  
Ilija Brceski ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Coal Combustion ◽  
Extraction Procedure ◽  
Coal Ash ◽  
Principal Component ◽  
Ceramic Materials ◽  
Combustion Products ◽  
Coal Combustion Products ◽  
And Cluster Analysis

Rare earth elements (REE) are frequently referred to as ingredients for enhancements in modern industry, as they are extensively applied in many industrial branches due to their accented electro-magnetic and optical properties. REE have end-utilizations as catalysts, magnets, and as dopants for ceramic materials. Rare earth minerals are scarce therefore the unconventional REE-containing resources such as waste materials and industrial byproducts are continuously being investigated. Coal combustion products comprise REE concentrations varying between 200 ppm and 1500 ppm. This quantity can be isolated though the extraction procedure. In this study, the five stages extraction was conducted on the coal combustion ash from the selected landfill site. The extractions of 32 elements (As, Ga, Ce, Be, Ge, Nd, Cr, Zr, Eu, Cu, Nb, Gd, Co, Mo, Dy, Li, Ag, W, Mn, Cd, Au, Ni, In, Hg, Pb, Sn, Tl, V, Sb, Th, Zn, and La) were conveyed. Chemical analyses were conducted via XRF, ICP-OES, ICP-MS, and AAS techniques. The complexity of the obtained data was examined by Principal component analysis and Cluster analysis in order to derive interconnections between quantity of elements and landfill characteristics, as well as mutual relationships among the elements of interest, and to assess the accomplishment of REE recovery from the coal ash.

Investigation on Extraction and Recovery of Rare Earth Elements from Coal Combustion Products

2021 ◽  
pp. 311-337
Author(s):  
Verónica Cristina Arellano Ruiz ◽  
Pankaj Kumar Parhi ◽  
Jin-Young Lee ◽  
Rajesh Kumar Jyothi
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Coal Combustion ◽  
Combustion Products ◽  
Coal Combustion Products

The recovery of rare earth elements from coal combustion products by ionic liquids

2019 ◽  
Vol 130 ◽  
pp. 142-147 ◽  
Author(s):  
Chao Huang ◽  
Yabing Wang ◽  
Bin Huang ◽  
Yamin Dong ◽  
Xiaoqi Sun
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Coal Combustion ◽  
Combustion Products ◽  
Coal Combustion Products

Ionic Liquids for the Recovery of Rare Earth Elements from Coal Combustion Products

2021 ◽  
pp. 617-638
Author(s):  
Isaac Kwabena Danso ◽  
Ana Belen Cueva-Sola ◽  
Zubair Masaud ◽  
Jin-Young Lee ◽  
Rajesh Kumar Jyothi
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Coal Combustion ◽  
Combustion Products ◽  
Coal Combustion Products

Bijenefits and Opportunities for Coal Combustion Products

2003 ◽  
Vol 14 (1) ◽  
pp. 39-49 ◽  
Author(s):  
Peter Brennan
Keyword(s):  
Coal Combustion ◽  
New Technologies ◽  
National Level ◽  
Bottom Ash ◽  
Coal Ash ◽  
Road Construction ◽  
Combustion Products ◽  
Total Production ◽  
Local Conditions ◽  
Coal Combustion Products

At the present time some 55 million tonnes of Coal Combustion Products (CCPs) are produced each year in Europe (EU 15). These CCPs include combustion residues such as boiler slag, bottom ash and fly ash from different types of boilers as well as desulphurisation products such as spray dry absorption product and FGD gypsum. Out of this total production of 55 million tonnes of CCPs, the amount of coal ash produced is around 47 million tonnes while approximately 8 million tonnes are products obtained from flue gas desulphurisation processes. CCPs are mainly utilised in the building material industry, in civil engineering, in road construction, for construction work in underground coal mining as well as for recultivation and restoration purposes in open cast mining. The majority of CCPs are produced to meet the requirements of standards or other specifications with respect to utilisation in certain areas. The utilisation rate of CCPs differs across European countries depending upon local conditions in respect of issues such as legislation, taxes and climate. The establishment of markets for CCPs has evolved over several decades and has involved a considerable amount of product development and research. As new technologies have been introduced, such as Cleaner Coal Technology (CCT), the power industry has had to adapt by carrying out further development and research to establish both technically and environmentally acceptable utilisation options for CCPs. While much development work has been carried out at a national level, recent years have seen an increasing amount of co-operation between different countries. In Europe an organisation known as ECOBA, the European Association for Coal Combustion, ‥Products has facilitated this.

scholarly journals Production of Porous Ceramic Materials from Spent Fluorescent Lamps

2021 ◽  
Vol 11 (13) ◽  
pp. 6056
Author(s):  
Egle Rosson ◽  
Acacio Rincón Rincón Romero ◽  
Denis Badocco ◽  
Federico Zorzi ◽  
Paolo Sgarbossa ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
High Speed ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Fluorescent Lamps ◽  
Naoh Solution ◽  
Commercial Glass ◽  
Triton X

Spent fluorescent lamps (SFL) are classified as hazardous materials in the European Waste Catalogue, which includes residues from various hi-tech devices. The most common end-of-life treatment of SFL consists in the recovery of rare earth elements from the phosphor powders, with associated problems in the management of the glass residues, which are usually landfilled. This study involves the manufacturing of porous ceramics from both the coarse glass-rich fraction and the phosphor-enriched fraction of spent fluorescent lamps. These porous materials, realizing the immobilization of Rare Earth Elements (REEs) within a glass matrix, are suggested for application in buildings as thermal and acoustic insulators. The proposed process is characterized by: (i) alkaline activation (2.5 M or 1 M NaOH aqueous solution); (ii) pre-curing at 75 °C; (iii) the addition of a surfactant (Triton X-100) for foaming at high-speed stirring; (iv) curing at 45 °C; (v) viscous flow sintering at 700 °C. All the final porous ceramics present a limited metal leaching and, in particular, the coarse glass fraction activated with 2.5 M NaOH solution leads to materials comparable to commercial glass foams in terms of mechanical properties.

Sign in / Sign up

Export Citation Format

Share Document