In this research, EMR, fly ash, and clinker were blended to make fly ash-based cementitious material (FAC) to investigate the effect of EMR on strength properties, hydration behavior ...
Desulfurized fly ash (DFA) is a byproduct derived from the tail gas purification of coal burning, which is composed of about 85% CaSO 3 and Ca(OH) 2 . China generated 130 million tons of DFA in 2019. Most of the DFA was converted into …
The results indicate that desulfurized ash increases the water requirement for the normal consistency, and it decreases Zeta electrical potential and strengths, and it prolongs …
Desulfurized gypsum is an industrial by-product gypsum obtained after flue gas desulfurization in coal-fired or oil-fired power plants [1]. Its main components and physical and chemical …
The experimental study of the cement-fly ash-desulfurized gypsum mortar system has explored the composition of cement, FA, and FGD through experiments [4]. The cement content is initially set at 10%-20% of the cementitious material, and FA is added. The amount is 10% to 60%, and the FGD is 20% to 70%; ...
This paper presents the strength, durability and microstructural characteristics of fly ash based geopolymer concrete in addition to red mud. The study explores the influence of other parameters on the compressive strength of GC such as Na2SiO3 to NaOH ratio (liquid-to-liquid), and alkaline solution to binder ratio. The presence of high alkalinity in the red mud was enough …
@article{Wang2023SynergisticEO, title={Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure}, author={Yaguang Wang and Xiaoming Liu and Xiang Zhu and Wenxi Zhu and Jianwei Yue}, journal={Construction and Building Materials}, year={2023}, url={https://api ...
Wang et al. [35]studied the synergistic effects of RM, desulfurized gypsum and fly ash in the preparation of gelling materials. However, due to the influence of additional Si/Al, there are few studies on the hydration reaction involved in RM itself, and even fewer studies on the relationship between a single material and RM.
The ash recycling process not only prolongs the residence time for ash burning, but also exposes the unreacted cores of sorbents, improving the limestone utilization and burn-offrate of carbon. …
In this work, typical alkaline solid waste - red mud (RM), sulfate solid waste - desulfurization gypsum (DG) and silicon-aluminum character solid waste - fly ash (FA) were …
Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base ...
Harmless treatment and resource utilization of wastes like fly ash have always been a social difficulty and a research hot spot in the field of pavement. In this paper, samples of fly ash generated from a coal-fired power plant in Yan'an City, Shaanxi Province were collected; and a desulfurized-high-calcium-fly-ash (DHCFA) was selected as the representative to be …
For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. ... C. (2022). Catalytic Pyrolysis of Sawdust with Desulfurized Fly Ash for Pyrolysis Gas Upgrading. International Journal of Environmental Research and Public ...
Mica schist weathered soil possesses a number of poor engineering characteristics, which make it difficult to use as a subgrade material for resource utilization. Therefore, in this study, a new type of curing agent, CFSD (cement–fly ash–slag–desulfurized gypsum), is proposed for this soil. The effects of different curing agent dosages, age of …
Even though the underlying mechanism was described as adsorption, a detailed explanation was not given. Other researchers used coal fly ash to remove dye in aqueous phase, explaining that SiO 2 and Fe 2 O 3 present in the fly ash were involved in the dye adsorption process (Dizge et al., 2008, Kumar et al., 2005, Lin et al., 2008, Sun et al ...
Recycling industrial solid waste for mine backfill is one of the best ways to achieve green production in multiple industries. In this paper, the desulfurization gypsum (DG) as an activator is combined with the modified magnesium slag-fly ash cementitious paste backfill (MFPB) technology for the co-disposal of solid waste and goaf treatment, and the influence of …
The motion track of desulfurized fly ash in flue gas was simulated by means of Fluent software. The abrasion and deposition of desulfurized fly ash to inner surface and other internals inside of dense flow absorber were studied. The results show that, under the simulated condition, the flue gas streamline is uniform inside of dense flow absorber which is installed with the equipment …
In this work, the mixed systems containing desulfurization ash (DA), fly ash (FA) and cement (OPC) are used to prepare the road-base stones by static pressure forming. The …
To effectively solve the problem of reutilizing semi-dry sintering flue gas desulfurized ash (SSFGDA) from steel plants, a new technology is proposed in this paper in which ash is added to a boiling furnace to obtain SO 2 during sulfuric acid production. Using thermodynamics and simulation calculations, the high-temperature characteristics of CaSO 3 …
The characteristics of fly ash from the flue gas desulfurization (FGD) system are important for its reuse and are mainly depend on the desulfurization process. The physical and …
In 2010, about 10 million tons of desulfurized ash was produced, making it the third largest solid waste in China, only after fly ash and desulfurized gypsum [10], [11], [12]. The annual production of desulfurized ash from newly added by-products in China is approximately 15 million tons, and it will accumulatively reach several billion tons by ...
2. Main Components and Particle Size Distribution of Coal-Based Solid Waste in the Ningdong Area. In this paper, fly ash-based gasification slag with high content is taken as the main research object, supplemented by coal gangue, desulfurization gypsum, and furnace bottom slag, and then mixed with ordinary 42.5 Portland cement to prepare green filling material [].
Keywords Desulfurized ash · Fly ash · Static pressure forming · Hydration products · Mechanism Introduction Desulfurization ash (DA) is a industrial by-product produced by semi-dry ue gas desulfurization technology. At present, the annual discharge of DA in China is more than 15 mil-lion tons [1, 2], most of DA is disposed of through land-
As part of these efforts, the present study intended to investigate the properties and desulfurization efficiency of Ca-based desulfurization sorbents using CFBC fly-ash as a binder.
By using one type of original red mud and three types of fly ash, this study revealed that with high alkalinity and desulfurization capacity, the red mud could serve as an excellent FGD sorbent. After FGD, the sodium sulfate in the desulfurized red mud acted as a chemical activator for geopolymer made with class C fly ash.
1. Introduction. Pulverized coal industrial boilers mainly use low-sulfur and high-quality coal as raw materials in Shendong areas. After combustion, the fly ash mainly contains SiO 2, Al 2 O 3, Fe 2 O 3 and CaO and it was highly alkaline. Under acondition of low temperature and low humidity, the Si and Al ions in fly ash dissolve from water and gel with lime, which …
Flue gas desulfurization (FGD) fly ash as a sustainable, safe alternative for cement-based materials. Author links open overlay panel Ivan Navarrete a, Felipe Vargas a, Patricia Martinez b, ... Utilization of low-quality desulfurized ash from semi-dry flue gas desulfurization by mixing with hemihydrate gypsum. Fuel, Volume 255, 2019, Article ...
Wansom et al. calcined FGD gypsum into flue gas desulfurized plaster, mixed it with fly ash and ordinary Portland cement to expand its applicability, improving its water resistance and compressive strength and minimizing the risk of sulfate attack under wet conditions (Wansom et al., 2019). Utilizing the excellent water performance of FGD ...
In this study, the catalytic effects of desulfurized fly ash (DFA) on the gaseous products of sawdust (SD) pyrolysis were investigated in a tubular furnace. The results indicated that DFA ...
Int. J. Environ. Res. Public Health 2022, 19, 15755 2 of 11 130 million tons of DFA in 2019. Most of the DFA was converted into low-value desulfurized gypsum [17,18]. Therefore, a large amount of DFA is currently deposited in the open air,
حقوق النشر © 2024.Artom كل الحقوق محفوظة.خريطة الموقع