Enhancing the degradation of dioxins during the process of iron ore
Iron ore sintering is a promising thermal method for co-disposing the municipal solid waste incineration (MSWI) fly ash. To reduce the increased dioxins in flue gas caused by adding fly ash powder, pelletizing was used as a pre-treatment for fly ash to enhance the degradation of dioxins.
اقرأ أكثر
Development of green engineered cementitious composites using iron ore
The increase of fly ash content (FA/C) increases the tensile ductility of ECC mixtures, and reduces first cracking and tensile strength. This trend can be explained by the fact that increase in fly ash content tends to lower the chemical bond at fiber/matrix interface and fracture toughness of ECC matrix, while increasing the interface ...
اقرأ أكثر
Extraction of alumina from high-alumina coal ash using an …
2.1 Experimental raw materials. Hydroxy sodalite was prepared from the fly ash of a thermal power plant in Inner Mongolia after alkali leaching. The chemical reagent, hydrochloric acid solution with a concentration of 36 wt%, phenolphthalein reagent, amorphous silica, and alumina drugs of analytical pure grade and NaCl of edible salt …
اقرأ أكثر
A novel low-cost method of silica aerogel fabrication using fly ash …
Highly porous and hydrophobic silica aerogel is fabricated using fly ash and trona ore as the starting materials and the cost-effective ambient pressure drying technique. The optimal calcination parameters are determined as temperature of 850 °C, holding time of 2 h, and the trona ore/fly ash mass ratio of 1.4. The CO 2 release mechanism during …
اقرأ أكثر
High-carbon fly-ash as a binder for iron ore pellets
@article{osti_781805, title = {High-carbon fly-ash as a binder for iron ore pellets}, author = {Kawatra, S K and Eisele, T C and Ripke, S J and Ramirez, G}, abstractNote = {The goal of this project was to convert currently unusable fly-ashes into a material that can be used as a binder for iron ore. Such a binder would also be useful for …
اقرأ أكثر
Alternate Cementitious Materials
Alternative cementitious materials are finely divided materiasl that replace or supplement the use of portland cement. Their use reduces the cost and/or improves one or more technical properties of concrete. These materials …
اقرأ أكثر
Characterization and Potential Usage of Stabilized Mine …
Stabilization is an established remediation for contaminated soils and for hazardous wastes. The main objective of this work is to study the behaviour of geotechnical characteristics of the tailing materials (TMs) which are stabilized using cement, lime and fly ash in different proportions and to propose an optimum percentage of blending agents ...
اقرأ أكثر
Pore structure characterization of early-age cement
The w/b values in this study are 0.3 and 0.4. The fly ash contents by weight are 0, 30%, 50% and 70%. Table 2 shows the mixture proportions of fly ash cement pastes. In this table, SJ indicates that the cementitious material in the sample is cement only, and CF indicates that the cementitious material in the sample contains cement and fly ash.
اقرأ أكثر
Fly Ash properties, characterization, and applications: …
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...
اقرأ أكثر
Full article: Properties of concrete containing fly ash and bottom ash
It is evident from the fact that at the end of 90 days, the control concrete gained an additional 11.5% strength over the 28 days compressive strength. In comparison, concrete containing fly ash and bottom ash mixture as fine aggregate has gained an additional 16% to 28.7% strength between 28 days to 90 days.
اقرأ أكثر
Experimental study on iron ore tailings sand and
In order to co-dispose and effectively utilize the bulk solid waste of iron ore tailings (IOT) sand and hazardous solid waste of municipal solid waste incineration …
اقرأ أكثر
Trends in the Rare Earth Element Content of U.S.-Based Coal …
Finally, fly ash is a fine powder, which makes it ideal for chemical processing and eliminates several costly ore processing steps (although it does preclude most physical beneficiation of the ash). (21) There is already precedent for metal recovery from fly ash, including gallium, germanium, and aluminum.
اقرأ أكثر
Reusable Ionic Liquid Enables Extraction of …
The researchers pretreated Class F coal fly ash with an alkaline solution and dried it, a step not needed for less recalcitrant Class C fly ash. Then, they heated ash suspended in water with [Hbet][Tf2N], …
اقرأ أكثر
Fly Ash
Fly ash is a heterogeneous by-product material produced in the combustion process of coal used in power stations. It is a fine grey coloured powder having spherical glassy particles that rise with the flue gases. As fly ash …
اقرأ أكثر
Co-treating MSWI fly ash in iron ore sintering process: …
Co-treating municipal solid waste incineration fly ash (MSWI-FA) in high-temperature iron ore sintering process is winning great concern. Most of the previous studies were about the co-treatment of raw MSWI-FA (without water washing) in sintering process. Although the content of dioxins in MSWI-FA was reduced, the high chlorine …
اقرأ أكثر
Compressive strength prediction of fly ash and blast furnace …
The research conducted on fly ash-GGBS-based concrete represents a significant contribution to the construction. The study involved the use of Anaconda-based Python programming, to illustrate and analyze a database taken from the published literature (Mallikarjuna & Gunneswara, 2018).The database contains valuable information that was …
اقرأ أكثر
The Effect of Adjusting Sinter Raw Mix on Dioxins …
The inhibition effect of calcined lime (CaO) and limestone (CaCO3) on the formation of dioxins during iron ore co-sintering with fly ash was investigated in a sinter pot in the present work. Experimental results …
اقرأ أكثر
Emission characteristics of dioxins during iron ore Co …
A few relevant researches concerning iron ore co-sintering with MSWI fly ash have been carried out in laboratory and pilot scales, showing potential possibility for the disposal of MSWI fly ash(Min et al., 2018). Previous studies added the raw fly ash in the iron ore sintering process without pretreatment and only 17 toxic PCDD/Fs were …
اقرأ أكثر
Utilization of coal fly ash in China: a mini-review on …
China is the largest coal consumer around the world, and coal accounts for more than 60% of the country's energy mix (Peng et al. 2018; Wang et al. 2019).Coal fly ash (CFA), a solid waste produced by coal-fired thermal power plants during the combustion of pulverized coal, is currently one of the largest solid wastes in China (Yao et al. 2015).In …
اقرأ أكثر
4,600 119,000 135M
Keywords: iron ore tailings, slag sand, fly ash, GGBS, geopolymer, sodium silicate, sodium hydroxide 1. Introduction World over there is a huge demand on the natural resources to cater to the
اقرأ أكثر
Fe-Si alloys production and alumina extraction from coal fly ash …
The comprehensive utilization of coal fly ash (CFA) has attracted extensive attentions owing to increasing awareness of environmental protection and secondary resource recycling. In this paper, a vacuum thermal reduction followed by magnetic separation and alkaline leaching was employed to produce Fe Si alloys and extract …
اقرأ أكثر
Fly ash properties, characterization, and applications: …
The dispersion of fly ash in water results in an alkaline pH from 10 to 13. At high pH, the fly ash becomes negatively charged allowing the removal of heavy metal …
اقرأ أكثر
Experimental study on iron ore tailings sand and
The fly ash (Class II fly ash) used in this experiment was obtained from the Qinhuangdao Municipal Group, which had the calcium content of less than 5%, the strength activity index of 72.13%, ... At 7d age, the sample of washed ash replacing iron tail ore did exceed the control group except for the 12% group, and other mix ratios exceeded the ...
اقرأ أكثر
Fly Ash, Slag, Silica Fume, and Natural Pozzolans, …
Fly ash, ground granulated blast-furnace slag, silica fume, and natural pozzolans, such as calcined shale, calcined clay or metakaolin, are materials that, when used in conjunc-tion with portland or blended cement, contribute to the properties of the hardened concrete through hydraulic or pozzolanic activity or both (Fig. 3-1).
اقرأ أكثر
Influence of iron tailing powder on properties of concrete with fly ash …
Iron tailings are the main mining wastes produced after recovery of valuable metal from iron ore [1]. Million tons of iron tailings are generated as a consequence of the increased demand of iron, steel and relevant industries. ... Fly ash is a kind of traditional and high quality mineral admixture. The spherical particles of fly ash lead to ...
اقرأ أكثر
Relation between leaching characteristics of heavy metals …
The results showed that CaClOH, NaCl, Ca(OH) 2, KCl and SiO 2 were primary mineral compositions in the MSWI fly ashes, and the particle size distribution of fly ash ranged between 10 μm and 300 μm. The smaller the particle size distribution of fly ash, the larger the BET-specific surface area, which was beneficial to the leaching of heavy metals.
اقرأ أكثر
Fly ash properties, characterization, and applications: A review
2.1. Crystalline phases. FA crystalline phases account for 5 to 50% of its mass. The crystalline phases consist of ten phases. Anhydrite (CuSO 4), Merwinite, Periclase, and C3A are found in class C fly ash.In addition to mullite, melite, quartz, hematite (Fe 2 O 3), magnetite (Fe 3 O 4), and lime.Anhydrite results from O 2, SO 2, …
اقرأ أكثر
Experimental study on iron ore tailings sand and
Download Citation | On Aug 1, 2023, Chao Jing and others published Experimental study on iron ore tailings sand and municipal solid waste incineration fly ash used in semi-rigid base of asphalt ...
اقرأ أكثر
Journal of Physics: Conference Series
The mass percentage of fly ash particles in different bulk density ranges was shown in Figure1. The bulk density distributions of three types of fly ash were significantly different, and the distribution of F2 was wider than that of F1 and F3. ore than 98% of fly ash M particles were located in the bulk density ranges of 1-2.89 g/cm
اقرأ أكثر
Research progress on synthesis of zeolites from coal …
The by-product of coal combustion, coal fly ash (CFA), has become one of the world's most emitted solid wastes, and bulk utilization while achieving high value …
اقرأ أكثر