Fly ash was first mechanically activated for 15 h to enhance its reactivity followed by loading of sulfated tin oxide as an active species in varying amounts (4.6–13.4 wt%) and analyzed by ...
Using industrial waste as part of the raw material to produce cement-based materials is considered to be a sustainable cement and concrete materials production …
The gasification fly ash (GFA), a bulk industrial solid waste from coal gasification process, urgently needs to be effectively disposed. In order to use the GFA as porous carbon materials, fluidized activation experiments of the GFA from an industrial circulating fluidized bed (CFB) gasifier were conducted in a bench-scale CFB test rig, as …
The partial crystallization may reduce the reactivity of Al–Si fly ash matrix, and consequently the leachable potential of amorphous Al–Si-bearing elements, such as Ga. Research is now focused to corroborate the potential suitability of these reagents for extracting Ga from this gasification fly ash.
Gasification fly ash (GFA) is a hazardous solid residue generated in the slagging-gasification of municipal solid waste (MSW). GFA contains higher amounts of heavy metals such as Pb and Zn than ...
Based upon the calcium content, European and American standards classify fly ash as follows: low calcium fly ash ≤10%, medium calcium fly ash 10–20%, ... The …
Biomass gasification to produce syngas is promising, but the limited hydrogen content of the syngas restricts its potential applications. This study proposed an efficient thermochemical approach that used cost-effective fly ash pretreated with washing and calcination (WCFA) as a catalyst to enhance hydrogen-rich syngas production from …
To the best our knowledge this percentage is rather high compared with figures tested on brick manufacture trials using fly ash from FB gasification (7). After the mixer was prepared the solid mixture was introduced in an electrical furnace. The firing temperatures tested were 1000ºC, 1025ºC, 1050ºC and 1075ºC for 4 h, in a firing time of ...
Two mixtures were tested, LWAFA: made of fly ash and LWA-SLFA made of a 50% mixture of slag milled at particle size < 300μm and fly ash. The thermal treatment for …
Conclusion. (1) The results of particle size analysis of gasification fly ash show that the particle size of 0.045 mm and 0.125–0.074 mm is dominant in the original ash, and all this part is the key to the removal of unburned carbon from gasification fly ash. (2) The flotation test results show that the difference concentration of inorganic ...
Immobilizing heavy metals (HMs) from municipal solid waste incineration fly ash (MSWIFA) using shell coal gasification fly ash (SFA)-based geopolymer can solve the energy and environmental challenges simultaneously. In this study, we synthesized a geopolymer with SFA, metakaolin (MK), and steel slag (SS) to solidify and stabilize HMs …
1. Introduction. Gasification is considered an alternative to conventional incineration for municipal solid waste (MSW) because it can produce valuable syngas …
Coal gasification has attracted increasing interests because it offers one of the cleanest and most versatile methods to convert coal into electricity, synthetic natural …
Possible mechanism of coal steam gasification catalyzed by modified fly ash. 4. Conclusion. In this study, acid and alkali-modified CF is used for H 2 production by coal steam gasification, effectively improving the H 2 yield and the carbon conversion of coal gasification. It was found that different sequences of acid-base modifications ...
Aries designs, develops, builds and operates proprietary gasification systems that provide environmentally friendly, sustainable solutions for biosolids conversion, biomass residue disposal, carbon emission reduction, and production of clean thermal/electrical energy and beneficial Bio-Fly-Ash™ or biochar.. Our facilities are industrial-grade and have been …
A generalized kinetic model for fly ash native carbon oxidation is developed. It is shown that the conversion of fly ash native carbon to CO{sub 2} is the result of two simultaneous processes taking place on fly ash surface: the first process (rate constant k{sub 2}) is the direct oxygen transfer from a metal oxide site to a vacant carbon active site leading to …
Keywords: Coal gasification; Fly ash; Germanium 1. Introduction will give more feasible extraction methods for some elements. The fine crystalline reduced species, mainly Coal fly ashes can be potential sources of valuable galena, sphalerite, wurtzite, phyrrotite and nickeline elements such as Ge.
Fly ash (FA) is the principal industrial waste byproduct from the burning of solid fuels. FA is a powdery solid that is constituted mostly of unburned carbon (UC), metal oxides (Si, Fe, Ca, and Al), and other inorganic substances. UC is an inexpensive source of activated carbon that plays an important role in FA adsorption capacity.
The pore and chemical structure characteristics of the raw coal and the coal gasification fly ash (CGFA) in an atmospheric pressure circulating fluidized bed gasifier with a gas production capacity of 20000 and 40000 Nm 3 h −1 were studied. The results indicated the presence of developed pore structure and high carbon content of the CGFA.
Hui Pana,* and Thomas L. Eberhardtb. Fly ash was collected as a byproduct from the processing of southern pine wood chips in a pilot-scale biomass gasifier. General properties of the fly ash were determined to assess its applicability as a soil amendment. Its alkaline pH (9.5) and high concentrations of Ca, K, and Mg suggest that it could be ...
Integrated gasification combined cycle (IGCC) fly ash produced in the Puertollano IGCC power plant has relatively high contents of Ge, large proportions (up to 84%) of which exist as water-soluble ...
The coal gasification fly ash was provided by Sinopec Anqing Petrochemical Company. The samples were first dried at 105 ℃ for 2 h to remove water, then were ground and sieved to obtain particles with a size less than 178 μm (CGFA). The NaOH (Beijing Chemical Factory), 36 % acetic acid solution (Sinopharm Chemical Reagent Co., ltd) and ...
Besides, as seen from Fig. 9 C-F, in both the bottom ash and fly ash, there existed obvious fusion phenomena on the surface of different agglomerated particles, further implying that ash fusion and agglomeration phenomena had occurred in the gasification process.
DOI: 10.1016/J.CONBUILDMAT.2019.03.292 Corpus ID: 140425816; Synthesis and characterization of geopolymer composites based on gasification coal fly ash and steel slag @article{Chen2019SynthesisAC, title={Synthesis and characterization of geopolymer composites based on gasification coal fly ash and steel slag}, author={Yuchi Chen and …
This article is concerned with a simple hydrometallurgical method for the selective recovery of germanium from fly ash (FA) generated in an integrated gasification with combined cycle (IGCC) process. The method is based on the leaching of FA with water and a subsequent concentration and selective separation of germanium by a solvent …
It is of interest in this context that Font et al. (2005b) have recently shown that gasification fly-ash containing as little as 200-400 ppm Ge might be leachable economically. However, this is to ...
However, the overall gasification efficiency was not desired because a large amount of gasification fly ash (GFA) escaped and its yield was up to 22%. In this case, the cold gas efficiency was below 48% and the carbon conversion ratio was only 62%. Further analysis reveals that the GFA was featured with a developed pore structure and the ...
The gasification fly ash is characterised by a relative enrichment in several valuable elements, such as Ge, Ni, Ga, and V, and by the occurrence of fine crystalline sulphides (rather than oxides) for many metals [16–17]. Within the content of these studies, Ge have been shown to occur as water soluble species, generating the possibility of ...
In this work, fly-ash water scrubbing experiments were conducted in a three-stage lab-scale dual-flow sieve plate scrubber to observe the performance of scrubber in fly-ash removal at different operating conditions by varying the liquid rate, gas rate and inlet fly-ash loading. The percentage of fly-ash removal efficiency increases with ...
4.2. Major Gasification Solid Byproducts. As discussed in the Background, solid waste from conventional pulverized coal-fired power plants is a significant environmental issue due to the large quantities produced, chiefly of coal fly ash, and the potential for leaching of …
Abstract. The catalytic carbon dioxide gasification of fly ash produced during the coal gasification of fluidized bed was studied by thermal gravimetric analyzer …
Coal gasification fly ash (CGFA) is a relatively new industrial byproduct derived from the coal gasification process and is different from the traditional coal combustion fly ash [20], [21]. The combustion of fossil fuels in the traditional power plants is also recognized as a principal source of CO 2 emissions worldwide [22].
A fly ash entrained flow gasification process was developed to simultaneously remove and utilize fly ash in the raw syngas coming directly from fluidized and fixed bed gasifiers.The present in situ experiments at a full load of 80,000 Nm 3 /h showed that, compared to the raw syngas, the effective syngas (CO + H 2) …
This article is concerned with a simple hydrometallurgical method for the selective recovery of germanium from fly ash (FA) generated in an integrated …
Therefore, if the gasification ash with high carbon content is used as fuel, it can be converted into fly ash with low carbon content. Low carbon fly ash can be used as high-quality raw materials for traditional building materials and high-strength polymer composites [13], and then natural rubber can be filled with low-carbon fly ash to prepare ...
Eight IGCC fly ash samples produced under different operational conditions of the IGCC plant, were used for the Ge extraction tests. Fly ash #21, #67 and #68 are characterized by CaO and SiO 2 contents close to 6 and 55%, respectively, and coarse grain size (median ranging from 30 to 70 μm). Fly ash #30, #66, #70 and #129 are …
Since the special composition and structure of coal gasification slag cannot be applied to the treatment of fly ash, under the requirement of resource recycling, using coal gasification slag requires a low cost, low water consumption, and a simple process. we have prepared high-crystallinity single-phase zeolite A with CEC 268.4 (mmol/100 g ...
Coal gasification fly ash (CGFA) is an industrial solid waste from the coal circulating fluidized bed (CFB) gasification process, and it needs to be effectively …
This paper has been focused on the study of thermal expansion in slag and fly ash samples from the ELCOGAS IGCC power plant located in Puertollano (Spain). 1. Introduction. The Integrated gasification in combined cycle (IGCC) power plant of ELCOGAS S.A. located in Puertollano, Ciudad Real (Spain) is the first IGCC plant …
