Quantitative phase analysis of the calcium silicate slag as the residue of extracting alumina from high-alumina fly ash

Huang, Dongbo; Zong, Yanbing; Liu, Xiaoming; Peng, Dandan; Yang, Zhijie

doi:10.1007/s12204-016-1787-z

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…XRD quantitative methods mainly include an internal standard method, K value method, adiabatic method, and Rietveld full spectrum fitting method, etc. [12,13]. All these methods determine the phase content according to the principle that the phase diffraction peak intensity in the sample to be tested is proportional to the content.…”

Section: Introductionmentioning

confidence: 99%

Determination of Fe3O4 Content and Total Nonhydraulic Minerals in Steel Slag

Hou,

Sun,

Wang

et al. 2024

Coatings

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The nonhydraulic minerals (Fe3O4, RO phase, Fe) in slag are important indicators for evaluating the pozzolanic activity and detecting the quality of the slag activation processing technology. Fe3O4 is an important characteristic mineral among the nonhydraulic minerals. In order to accurately assess the pozzolanic activity of steel slag powder and to monitor the quality of the activation process of steel slag powder for separate nonhydraulic minerals, it is imperative to precisely determine the nonhydraulic mineral content within the steel slag. Further refinement and enhancement are required for both the HNO3 dissolution method used in determining Fe3O4 content in steel slag, as well as for the EDTA-DEA-TEA (ethylenediamine tetraacetate sodium-diethylamine-triethanolamine) dissolution method employed in determining total nonhydraulic minerals, due to potential deviations caused by challenging impurity separations. The results show that the content of Fe3O4 is determined by 10%HNO3-20%NaOH-chemical analysis method, which solves the problem that the impurities of refractory materials (quartz, corundum, mullite) and amorphous phase affects the content determination in HNO3 dissolution method. The total amount of nonhydraulic minerals (Fe3O4, RO phase, Fe) was determined by the EDTA-NaOH-TEA dissolution method, which solved the problem that the incomplete dissolution of C2F in the EDTA-DEA-TEA dissolution method affected the content determination. The maximum error between the content determination value and the theoretical calculation value of the two methods is less than 0.50%. The improved Fe3O4 and total nonhydraulic mineral quantification methods are feasible and reliable.

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Section: Introductionmentioning

confidence: 99%

Determination of Fe3O4 Content and Total Nonhydraulic Minerals in Steel Slag

Hou,

Sun,

Wang

et al. 2024

Coatings

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“…Calcium silicate slag is the secondary solid waste generated in the process of extracting alumina from high alumina fly ash, with 2.2~2.5 tons of calcium silicate slag produced per ton of Al 2 O 3 alumina, and 2.5 tons of fly ash consumed [ 13 ]. Long term CSS accumulation not only wastes a significant amount of land resources and causes air pollution, but, additionally, because it becomes alkaline itself, it will gradually alkalize the surrounding land in a humid environment, causing the loss of soil nutrients and polluting groundwater resources [ 14 ]. According to the physical and chemical properties of CSS and fly ash (FA), the authors carried out the development of CSS pavement base material with CSS as the main material.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Subgrade Material of Calcium Silicate Slag

et al. 2022

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Calcium silicate slag (CSS) is used as a secondary solid waste produced by aluminum extraction technology from high alumina fly ash, and its resource utilization has always been a key issue to be solved. In this study, CSS was used to replace a portion of fly ash (FA) to prepare a new inorganic binder stabilized material for road base. The unconfined compressive strength (UCS), phase composition, microstructure, durability and performance index of the base of the test section of the CSS pavement base material were studied. The results showed that with the increase in CSS content, the UCS of pavement base materials gradually increased. Under standard curing conditions, the UCS increased 6.90~17.24% after 7 days, and 7.90~28.95% after 28 days. The main reason was that as the hydration time increased from 7 d to 28 d, the hydration products C-A-S-H gel and C-S-H gel increased, the [SiO4] polymerization degree increased, the crystal type changed, and the structure denser, which supported the good development of mechanical strength of CSS pavement base material. In addition, the research has been successfully applied to a pilot test in Hohhot, China. The freeze–thaw resistance, water stability and UCS of the CSS pavement base material were tested to meet the requirements of Chinese road construction standards, indicating that the application of CSS in pavement base is feasible.

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The cementitious composites using calcium silicate slag as partial cement

Yan

Zhao

et al. 2020

Journal of Cleaner Production

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Quantitative phase analysis of the calcium silicate slag as the residue of extracting alumina from high-alumina fly ash

Cited by 3 publications

References 24 publications

Determination of Fe3O4 Content and Total Nonhydraulic Minerals in Steel Slag

Determination of Fe3O4 Content and Total Nonhydraulic Minerals in Steel Slag

Experimental Study on Subgrade Material of Calcium Silicate Slag

The cementitious composites using calcium silicate slag as partial cement

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