Recovery of platinum and synthesis of glassceramic from spent automotive catalyst via cotreatment process with coal fly ash Sun, Shuchen; Liu, Chuan; Xiao, Faxin; Tu, Ganfeng; Abstract. Publication: Journal of Material Cycles and Waste Management.
The Department of Energy is funding efforts to recover REEs from coal and coal combustion residuals. A promising source is coal fly ash, which is a byproduct from coalfired power plants. This waste produced by burning coal for power can have concentrations of REEs similar to those found in raw ores.
A new processing technology was developed based on the finding for alumina extraction from coal fly ash. The use of concentrated sulfuric acid shortened the process cycle and improved the recovery efficiency comparing with other acidic leaching processes for aluminum extraction from coal fly ash.
Fly ash is the fine ash collected from the flue gas after coal combustion. It is the main solid waste discharged from coalfired power plants. ... The fly ash processing plant constructed by AGICO Cement is highly automated and mechanized, ... Due to the adjustable forced vortex centrifugal separation technology, this system has a big advantage ...
Coal fly ash (CFA) is the most common solid waste in the coal combustion process (Żyrkowski et al. 2016), accounting for 520 wt% of raw coal (Yao et al. 2015). According to statistics, the total annual output of global CFA is about 1200 Mt, yet its average comprehensive utilization rate is only about 60% (Yang et al. 2021 ).
For t et al. [16] replaced the biomass ash of coal with the fly ash of burned wood, and test results for specimens cured for 28 days indicated that woodbased biomass ash could replace up to 30% ...
Coal fly ash (CFA) is generated during the combustion of coal for energy production. Many studies are based on its utilization as the most abundant, cheap aluminosilicate industrial residue, which is recognized as a risk for the environment and human health. ... Fuel Processing Technology. 2016; 149:163168. DOI: /; 31.
Coal fly ash is a lightweight incombustible particulate generated during coal combustion. Alumina content in the fly ash is present in the mullite phase, and its high stability calls for alternative processing for conversion to reactive phase before leaching. Mechanical activation with sodium hydroxide was found unsatisfactory for the breakdown ...
Coal fly ash (CFA) is a highly versatile raw material that has the potential to yield multiple valueadded products, including cenospheres, zeolites, carbon nanotubes, and fertiliser substrates. Despite its versatility, a majority of these components are often overlooked, and CFA is primarily used for construction. Conventional processing methods of CFA are known to pose significant ...
Coal fly ash is one of the most complex of the materials that can be characterized. Approximately 316 individual minerals and 188 mineral groups have been identified in various ash samples (Vassilev and Vassileva, 1997, Vassilev et al., 2003, Vassilev and Vassileva, 2005).The major components are metallic oxides with varying contents of unburnt carbon as measured by a loss on ignition (LOI) test.
For the samples from bituminous coal combustion, where desulphurisation process (lime added to the boiler) took place (samples 9, 10, 11 and 12), sulphur group minerals such as anhydrite (in the form of rosette aggregates) and gypsum (needlelike forms) with calcite were observed (Fig. 1).The aggregates of small amount of illite group minerals were noted in the samples obtained from fluidise ...
For several years, the development and creation of novel resourcesaving technologies for processing ash and slag waste of the combined heat and power (CHP) plants has been the core for solving the key problem of global accumulation of technogenic waste. ... "A comprehensive review on the applications of coal fly ash," EarthScience Reviews ...
On the basis of the above, a combination technology for processing heat and power plants fly ash has been developed, that includes magnetic and electrical separation in vibrofluidized state ...
Owing to the depletion of bauxite and increasing demand for alumina, calcination methods for extracting alumina from coal fly ash (CFA) were developed. However, these methods have disadvantages such as the need for high temperatures and the emission of toxic gases. Hence, in this study, Al2O3 was extracted from CFA via lowtemperature potassium bisulfate calcination technology. Effects of the ...
A novel approach was used as support for synthesis of fly ash derived catalyst from waste fly ashes from the energy sector was used as support in the preparation of Nicatalysts for CO 2 catalysts were characterized by XRD, H 2TPR, CO 2TPD and N 2 lowtemperature nitrogen sorption. As a result of application of new approach using a ballmill mechanical energy, carbon dioxide ...
The processing of coal fly ash in the Russian Federation amounts to less than 10% of that produced, which is significantly below the levels obtained in economically developed
The synthesis of such particles from fly ash makes the process and product economical and ecofriendly by providing a safe and environment friendly disposal of fly ash. Discover the world's ...
Coal combustion is one of the leading sources of CO2 emissions, and it is predicted to remain so for the foreseeable future. The environmental effects of coal burning can be partially offset by utilizing fly ash, which is a combustion byproduct, to mineralize and store carbon. Our study tests a novel method for carbon storage through the reaction of fly ash with oxalic acid (H2C2O4), creating ...
The hydrochemical process has been employed to extract alumina from lowgrade aluminabearing materials, containing red mud, nepheline and fly ash [2830]. Our previous work showed that an ideal alumina extraction rate from fly ash (more than 90%) could be achieved by a mild hydrochemical process .
We describe a process of chlorination of fly ash with either chlorine gas or calcium chloride, which successfully decomposes mullite and permits the extraction of a number of industrially useful, acidsoluble compounds. ... Shcherban, and Pevzner, in Technologies of Coal Fly Ash Processing into Metallurgical and Silicate Chemical ...
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