scholarly journals Review on Evaluation of Rare Earth Metals and Rare Valuable Metals Contained in Coal Ash of Coal-fired Power Plants in Korea

2015 ◽  
Vol 1 (1) ◽  
pp. 121-125
Author(s):  
Seok-Un Park ◽  
Jae-Kwan Kim ◽  
Yeon-Seok Seo ◽  
Jun-Seok Hong ◽  
Hyoung-Beom Lee ◽  
...  
Keyword(s):  
Rare Earth ◽  
Power Plants ◽  
Rare Earth Metals ◽  
Coal Ash ◽  
Valuable Metals

scholarly journals Power Plants’ Coal Ash Treatment in Processes related to Bacterial Leaching of Rare Earth Metals

10.12737/716 ◽  
2013 ◽  
Vol 2 (4) ◽  
pp. 17-22 ◽  
Author(s):  
Петрова ◽  
E. Petrova ◽  
Виноградов ◽  
M. Vinogradov ◽  
Балина ◽  
...  
Keyword(s):  
Rare Earth ◽  
Power Plants ◽  
Rare Earth Metals ◽  
Precious Metals ◽  
Coal Ash ◽  
Bacterial Leaching ◽  
Flotation Process ◽  
Flotation Machine ◽  
Slag Waste ◽  
Metals Extraction

The flotation process of power plants’ ash-slag materials treatment is considered in the article. The original method related to preparing of ash-slag waste before their further bioleaching processing is proposed. The positive results of rare earth metals extraction efficiency increase by bioleaching are obtained. The essence of proposed approach is as follows. Coal combustion’s ash-slag waste is mixed with water to obtain a fine suspension, in which the carbonaceous reagent is injected. Flotation treatment of ash suspension is carried out in mechanical flotation machine with flotation time equal to 15-18 min and air flow rate equal to about 0.7-0.8 m3/(m2·min). The chamber product as treated ash suspension is going to the separation in open hydrocyclone. In such a case the concentration product in the form of ash product is derived to special site, and hydrocyclone overflow is directed to the clearing in pressure flotation machine for extraction of metal ions from the liquid. A positive effect of rare earth metals’ extraction rising related in particular to scandium about 26.6-30.3%, yttrium — 28-34.7%, lanthanum — 50.5-21.5%, as well as precious metals such as gold — 18.7-21.6%, silver — 11.4-21.4% is obtained.

scholarly journals Evaluation of Some Rare Metals and Rare Earth Metals Contained in Coal Ash of Coal-fired Power Plants in Korea

2015 ◽  
Vol 24 (4) ◽  
pp. 67-75
Author(s):  
Seok-Un Park ◽  
Jae-Kwan Kim ◽  
Yeon-Seok Seo ◽  
Jun-Seok Hong ◽  
Hyoung-Beom Lee ◽  
...  
Keyword(s):  
Rare Earth ◽  
Power Plants ◽  
Rare Earth Metals ◽  
Coal Ash ◽  
Rare Metals

Marine Authigenic Deposits Mineral - New Fields for the Development of Rare Earth Resources

2011 ◽  
Vol 291-294 ◽  
pp. 1748-1751
Author(s):  
Ying Zhang ◽  
Chang Shui Liu ◽  
Lian Feng Gao ◽  
Zhen Guo Zhang ◽  
Peng Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Mineral Resources ◽  
Resource Depletion ◽  
Polymetallic Nodules ◽  
Growth History ◽  
Valuable Metals ◽  
The World ◽  
Development And Utilization ◽  
Rare Earth Mineral

Rare earth metals are an important strategic resource. Due to scarce reserves, and large consumer demand, it is facing the crisis of resource depletion. Marine are the largest deposits sites in the world. In the long growth history, marine autogenic sedimentary mineral, such as polymetallic nodules, crusts with large quantities, not only contain the enrichment of Mn, Fe, Co, Cu, Ni and other valuable metals, but also contain extremely rare earth elements (REE) in the crust. Thus, in the process of developing marine mineral resources, Mn, Fe, Co, Cu, Ni and other metals are used, while it is possible for the development and utilization of the associated rare earth mineral. Marine may become a new field of rare earth resources development.

scholarly journals Leaching Characteristics of Low Concentration Rare Earth Elements in Korean (Samcheok) CFBC Bottom Ash Samples

2019 ◽  
Vol 11 (9) ◽  
pp. 2562 ◽  
Author(s):  
Lai Tuan ◽  
Thriveni Thenepalli ◽  
Ramakrishna Chilakala ◽  
Hong Vu ◽  
Ji Ahn ◽  
...  
Keyword(s):  
Rare Earth ◽  
Power Plants ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Coal Ash ◽  
Low Grade ◽  
Fluidized Bed Combustion ◽  
Basic Characteristics ◽  
Mass Volume ◽  
Circulating Fluidized Bed Combustion

Coal-derived power comprises over 39% of the world’s power production. Therefore, a mass volume of coal combustion byproducts are generated and shifted the extra burden onto the economy and environment. Circulating fluidized bed combustion (CFBC) has been found to be a clean and ultimate technology for Korea’s coal-fired power plants to have effective power generation from low-grade imported coal with reduced emissions. Efforts have been made to broaden the utilization of CFBC coal ash, and to promote sustainable development of CFBC technology. Investigations provided numerous evidences for coal ash to be a potential deposit for rare earths reclamation. However, the basic characteristics and the methods of rare earth mining from the CFBC bottom ash lack detailed understanding and are poorly reported. This study highlighted an insight of the CBFC bottom ash with respect to REEs concentration. Moreover, agents were tested as a means for leaching REEs from Samcheok CFBC bottom ash. The leaching tests were performed in relation to variations in concentration, time and temperature. The results were applied to identify suitable processes to leach REEs from the ash and clarify the potential valuation of CFBC bottom ash. The leaching conditions attained by ANOVA analysis for hydrochloric concentration, temperature, and time of 2 mol L−1, 80 °C, and 12 h, were found to provide a maximum extraction of yttrium, neodymium and dysprosium of 62.1%, 55.5% and 65.2%, respectively.

scholarly journals Best Practices of Russia and Finland in Extracting REE from Fertilizer Waste

2017 ◽  
Vol 2 (2) ◽  
pp. 168
Author(s):  
Vladimir Rychkov ◽  
Pertti Koukkari ◽  
Sergey Kirillov ◽  
Evgenii Kirillov
Keyword(s):  
Rare Earth ◽  
Best Practices ◽  
Rare Earth Metals ◽  
The Other ◽  
Raw Material ◽  
Added Value ◽  
Waste Stream ◽  
Valuable Metals ◽  
Inorganic Waste ◽  
Modern Technologies

<p>In the production of fertilisers and commodity metals large amounts of stabilised waste is generated. Conventionally, manufacturing is targeted at the recovery of economically and technically most attractive key elements while the inorganic waste stream will gather all the other added-value chemical quantities. For example, substantial amounts of <em>rare earth metals</em>, which are increasingly used in various modern technologies including cleantech and photonics are present in <em>phosphogypsum</em>, the voluminous waste of the worldwide fertiliser industry. The waste heaps, while generally stabilised against weathering, appear usually granular or even as powder-like fines. Thus they represent a readily comminuted raw material for innovative mechanical, hydrometallurgical, biohydrometallurgical and pyrometallurgical techniques to recover considerable amounts of valuable metals and metal concentrates.</p>

scholarly journals Rare Earth Metals Leaching from Coal Ash and Theirs Concentration

2016 ◽  
Vol 5 (1) ◽  
pp. 48-55
Author(s):  
Сеник ◽  
E. Senik ◽  
Виноградов ◽  
M. Vinogradov ◽  
Таранов ◽  
...  
Keyword(s):  
Rare Earth ◽  
Ion Exchange ◽  
Rare Earth Metals ◽  
Experimental Studies ◽  
Cation Exchange Resin ◽  
Acid Leaching ◽  
Coal Ash ◽  
Flow Diagram ◽  
Ion Exchange Resins ◽  
Exchange Resins

Problems related to rare earth metals leaching from coal ash and theirs ion-exchange concentration from sulfuric solutions, in particular the characteristics of scandium, yttrium and lanthanum sorption by different ion exchange resins have been considered in this work. It has been shown that the best way to leach rare earth metals from coal ash is a complex acid and biological treatment of ash waste. Kinetics related to the process of scandium, yttrium and lanthanum acid leaching from ash and slag waste of CHPP in Kumertau has been investigated. Subsequent metal solutions concentration was achieved using ion exchange resins. The results of experimental studies related to the processes of rare-earth metals (in particularly scandium) ion exchange concentration by cation exchange resin in the Naform PC-100 have been presented, as well as the results of experimental studies related to rare earth metals (scandium including) sedimentation process, using special sedimentators. Dependences of rare earth metals (in particular scandium) sedimentation efficiency against pH value have been constructed, and recommendations for pH values, that are optimal for rare earth metals sedimentation, have been given. Based on obtained experimental results it was created and tested an experimental laboratory prototype of plant for rare earth metals (scandium, yttrium and lanthanum including) extraction from located near Moscow brown coal basin’s slag heaps, and from ash dumps of Russian Federation’s energy enterprises. This plant’s process flow diagram as well as its operation description has been presented. The created plant was tested in modes previously fulfilled in laboratory conditions. At the same time, carried out integrated exploration have showed the prospects for implementation of developed technical solutions for processing of ash dumps of Russian Federation’s various energy enterprises.

Magnetic susceptibility of liquid heavy rare earth metals

1979 ◽  
Vol 40 (C5) ◽  
pp. C5-260-C5-261 ◽  
Author(s):  
M. Müller ◽  
E. Huber ◽  
H.-J. Güntherodt
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Metals ◽  
Heavy Rare Earth

ELECTRONIC RELAXATION IN RARE EARTH METALS AND ALLOYS - A NON-KRAMERS EXAMPLE : Tm3+

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-25-C1-31 ◽  
Author(s):  
N. S. Dixon ◽  
L. S. Fritz ◽  
Y. Mahmud ◽  
B. B. Triplett ◽  
S. S. Hanna ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Metals And Alloys ◽  
Electronic Relaxation
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