The resulting biosorbent was used for grouped REE extraction from low-grade feedstock fly ash (FA) leachate in a flow-through format (Dong et al., 2021). In another study inspired by LanM, chimeric protein DLanM containing two copies of LanM was immobilized onto agarose microbeads using a Cnbr-activated amine condensation reaction.
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A novel method, including ammonium fluoride activation and water leaching, was developed to extract lithium from coal fly ash. Lithium was released from the glass phase in …
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Disclosed is a method for extracting aluminium oxide in fly ash by an alkaline process comprising: step (1), adding lime or limestone in the fly ash, and adding an alkaline solution, to produce a raw slurry; step (2), firing the raw slurry into a wrought material; step (3), performing alkaline leaching on the wrought material and liquid-solid separation on the leached slurry, so as to obtain a ...
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The invention relates to the technical field of extracting lithium from fly ash, and discloses a method for extracting lithium from fly ash, which comprises the following steps: taking fly ash; step two: leaching treatment; step three: acidifying the leachate; step four: filtering; step five: heating and crystallizing; step six: drying treatment; step seven: carbon dioxide is added.
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Fly ash is often combined with cordierite and other high-quality materials, which increase its utilization cost. Moreover, the utilization ratio of high-alumina fly ash is relatively low [18].In this study, steel slag tailings were used as additives, and porous ceramics were synergistically sintered together with high-alumina fly ash beads, which provided a new idea …
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Alternative extraction methods have explored ways to effectively recover REEs from CFA without using HF. Modern, non-traditional approaches, ... Digestion methods for analysis of fly ash samples by atomic absorption spectrometry. Anal. Chim. Acta, 395 (1999), pp. 157-163.
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All tested fly ash has developed pozzolanic activity since the first test age. 3. TESTING METHOD The extraction of alkalis from fly ash was analyzed to evaluate their possible contribution to the porous phase of concrete once hardened and in contact with moisture. For this, two methods were concrete. e-
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This study offers a sustainable approach to diversifying REE supplies by recovering REEs from low-grade coal fly ash in industrial wastes and provides a scientific …
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The optimal technological conditions for extracting aluminum from coal fly ash were eventually confirmed that coal fly ash with size of 74 μm and sulfuric acid with concentration of 50% are mixed ...
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This research explores the beneficial reuse of coal combustion fly ash as a source of rare earth elements (REE). We characterized fly ashes of varied geological origin, tested several extraction methods and parameters, and investigated REE location and speciation in fly ash. Total REE content in a broad sample of U.S. fly ashes were
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The need for mineral and metal commodities has significantly increased due to the constant changes in the world. Consequently, mining, chemical, and other related fields are tasked with finding new sources of minerals and metals, developing efficient methods for extracting them through hydrometallurgical extraction, and creating low-cost chemical refining …
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Coal fly ash is an industrial solid waste product collected by a dust removal device in a coal-fired power plant (Shemi et al., 2012).China is the world's largest coal producer and consumer (Li et al., 2015).It is the largest producer of coal fly ash in the world with about 580 million tons of coal fly ash produced per year and its current stockpiles have reached 2.5 …
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historical Puertollano IGCC fly ash samples selected in this study are representative of the range of Ge and Ga concentrations and water Ge extraction yields found in t his fly ash 11. The Ge and Ga contents of the new fly ash samples are also in the range determined for these elements in this gasification fly ash.
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The invention discloses a method for extracting aluminum from fly ash, which comprises the following steps: slaking, wet-process roasting, acidification roasting, evaporative crystallization, aluminum hydroxide extraction, aluminum oxide preparation and fusion electrolysis. Most traditional methods for activating fly ash adopt mixed roasting and have higher energy …
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out by adding 50.0 g coal fly ash, a certain amount of 95% H2SO4 and water into the high pressure reactor. The mass ratio of coal fly ash and 95% H2SO4 was fixed depending on the contents of metal oxides in coal fly ash. Extraction of aluminum was investigated comprehensively by varying coal fly ash size (D90: 11, 38,
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The invention provides a method for extracting gallium from fly ash based on a resin method, which takes crude liquid obtained after the fly ash is subjected to acid leaching treatment as a raw material. Compared with the prior art, the method is based on a resin method, the dosage of reagents such as alkali liquor and the like is obviously reduced, additional reagents such as an …
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Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using hydrochloric acid to obtain hydrochloric acid leachate; adsorbing gallium contained in the hydrochloric acid leachate with macro-porous cationic resin, followed by eluting to obtain an …
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The recycling of valuable metals from circulating fluidized bed (CFB)-derived high-alumina fly ash (HAFA) paves the way for ash utilization with high economic benefits. However, obtaining an ideal extraction ratio for metals using a single acid treatment under moderate conditions is difficult. A moderate acid–alkali–based alternate method was used in this study to …
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Fly ash consists of significant amounts of lithium, which is an essential resource for developing batteries. This study proposed an efficient method for extracting lithium from fly ash. First, we explored the parameters affecting the activation effect of sodium carbonate roasting and the leaching efficiency of lithium using acid leaching. Additionally, ultrasonic pre-treatment was …
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leaching and recovering of fly ash metal resources. Keywords: fly ash, process mineralogy, minerals, rare and precious metals, separation and enrichment 1. Introduction The amount of fly ash produced is 5-20% of the total mass of coal used. In 2015, the total amount of fly ash was expected to reach 580 million tons in China [1]. In addition to ...
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This method allows for the efficient separation of aluminum from iron, further enhancing the feasibility of utilizing fly ash as a resource[5]. Technical Terms. Fly Ash: A fine powder that is a ...
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In this study, the possibility of treating coal fly ash (CFA), a residue formed as a result of coal combustion in coal-fired power plants, was investigated. Eskom CFA contains significant amounts of alumina typically, 26-31%, in two dissimilar phases, namely amorphous and crystalline mullite, which may be processed separately.
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Many studies have demonstrated that the aluminum-based phase and amorphous aluminosilicate phase may be capable of containing trace metals such as Ge, V, and Li. Intensive extraction methods are required to break down the glassy phase of aluminosilicates, the main phase of fly ash [2]. Although CFA has vast potential, limited research has been ...
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Shuhua Ma's 41 research works with 1,202 citations and 9,471 reads, including: Effects of alkali activation and hydrothermal processes on the transformation of fly ash into Al-substituted ...
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Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using...
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This study reviews different technologies for extraction of heavy metals from fly ash. With this perspective processes like bioleaching using microbes, carrier in pulp method, …
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Valuable metal extraction technology from thermal power plant fly ash is limited. In the present study, aluminium is extracted from fly ash as highly pure aluminium sulphate (>99.0%) by leaching ...
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Journal of Hazardous Materials, 2009. In this study the purity of the germanium end-products obtained by two different precipitation methods carried out on germanium-bearing solutions was evaluated as a last step of a hydrometallurgy process for the recovery of this valuable element from the Puertollano Integrated Gasification Combined Cycle (IGCC) fly ash.
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In this study, high-alumina fly ash was efficiently activated by ammonium sulfate method and the alumina was efficiently extracted. The effects of roasting temperature, roasting time, and ammonium ...
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Method for simultaneously extracting glass microbeads from fly ash and coproducing aluminum-silicon-iron alloy and white carbon black. ... [0007] In view of this, the object of the present invention is a method for extracting glass …
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extraction11,12 and sorption onto chelating exchange resins.13,14 The SX method for the recovery of germanium from fly ash is based on the germanium-catechol (C 6O 2H 6) chelate and the subsequent extraction of the complex using tri-n-octylamine ((C 8H 17) 3N) and stripping with alkaline solutions. The equilibrium extraction
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The invention provides a method for simultaneously extracting glass microsbeads from fly ash and coproducing aluminum-silicon-iron alloy and white carbon black, relating to the technical...
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The method of recovering the waste heat, proposed in this study, is the transfer of heat from activated coal fly ash to gas with the movement of air using the packed bed, providing valuable energy ...
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A process for extracting alumina from powdered coal ash while generating white carbon black includes such steps as grinding powdered coal ash, activating, adding ammonium sulfate, reacting, adding water, filtering, filling ammonia gas into the filtered liquid to obtain the deposited mixture of aluminum hydroxide and iron hydroxide, adding the solution of sodium hydroxide to …
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Comparison of different method for extracting alumina from fly ash can be found in Table 3. Combined pre-desilication and lime-soda sintering method and ammonium sulfate/ammonium bisulfate sintering method are mature and economical methods in industrial production at present, and the yield of alumina is greater than 90%. ...
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The utility model discloses a device for sorting and extracting ultrafine fly ash microbeads, which is sequentially communicated with a first emulsifying tank, a FL vertical classifier, a...
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The invention discloses a device for sorting and extracting ultrafine fly ash microbeads, which is sequentially communicated with a first emulsifying tank, an FL vertical classifier, a...
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