Effect of AlF3 production waste on the processes of hydration and hardening of the alkali-activated Portland cement with sodium silicate hydrate

Schroeyers, Wouter; Vaičiukynienė, Danutė; Kantautas, Aras; Vaitkevičius, Vitoldas; Šerelis, Evaldas

doi:10.1007/s10973-019-08086-y

Cited by 8 publications

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“…It was found that the compressive strength values of hardened samples of silica gel and clay, which were additionally treated with sodium hydroxide and calcined at 600 • C (3 h), were equal to 6-17.50 MPa. Krivenko et al [28] investigated the influence of sodium silicate (Na 2 SiO 4 ) activated silica gel waste on the hydration characteristics of cement samples. It was found that the additive changes the mechanism of early hydration:…”

Section: Introductionmentioning

confidence: 99%

“…(1) increase the amount of heat released during the main hydration reaction; (2) prolong the duration of the induction period; and (3) promote the crystallization of both crystalline and amorphous calcium silicates hydrates and calcium aluminate hydrates. The discussed studies [17,[26][27][28] did not determine the durability of the samples or the stability of the fluorine ions.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Various Hydroxide and Salt Additives on the Reduction of Fluoride Ion Mobility in Industrial Waste

et al. 2021

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In this work, the influence of various hydroxide and salt additives on the removal of F− ions from silica gel waste, which is obtained during the production of AlF3, was examined. The leaching of the mentioned ions from silica gel waste to the liquid medium was achieved by the application of different techniques: (1) leaching under static conditions; (2) leaching under dynamic conditions by the use of continuous liquid medium flow; and (3) leaching in cycles under dynamic conditions. It was determined that the efficiency of the fluoride removal from this waste depends on the w/s ratio, the leaching conditions, and the additives used. It was proven that it is possible to reduce the concentration of fluorine ions from 10% to <5% by changing the treatment conditions and by adding alkaline compounds. The silica gel obtained after the leaching is a promising silicon dioxide source.

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Section: Introductionmentioning

confidence: 99%