利用铁矿尾矿生产硅酸钠和地质聚合物两种产品

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Brazilian Chemical Society Pub Date : 2023-05-26 DOI:10.21577/0103-5053.20220149

C. Prates, A. Lima, I. Ferreira, Fabiano G F de Paula, Paula S. Pinto, J. Ardisson, R. Lago, A. Teixeira

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引用次数: 0

摘要

在这项工作中，铁矿尾矿(IOT)被用于生产两种不同的材料:硅酸钠和地聚合物。首先，在200°C的高压釜中(SiO2:NaOH摩尔比为1:1.5和1:2.5)，反应时间为4和8 h，对IOT与NaOH进行水热反应。x射线荧光(XRF)、x射线衍射(XRD)、Mössbauer光谱、扫描电镜(SEM-EDS)和滴定表明，IOT与NaOH的摩尔比为1:2.5，反应时间为8 h时，IOT与NaOH的石英完全溶解。得到了主要由赤铁矿和水玻璃水相组成的固体组分，SiO2含量约23%，Na2O含量约19%。然后将所得的硅酸钠与物联网(25%和50% wt.%)结合，制成具有优异物理化学性能、快速固化时间和非常好的抗压强度的地聚合物材料，其抗压强度范围为41至58 MPa，具有许多潜在的应用前景。

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Use of Iron Ore Tailing as Raw Material for Two Products: Sodium Silicate and Geopolymers

In this work, iron ore tailing (IOT) was used for the production of two different materials: sodium silicate and geopolymers. Initially, reactions of IOT with NaOH were carried out by hydrothermal reaction in autoclave at 200 °C (1:1.5 and 1:2.5 SiO2:NaOH molar ratio) and reaction times of 4 and 8 h. X-ray fluorescence by dispersive energy (XRF), X-ray diffraction (XRD), Mössbauer spectroscopy, scanning electron microscopy (SEM-EDS) and titrations showed that IOT:NaOH ratios of 1:2.5 and reaction time 8 h completely dissolved the quartz from the IOT, obtaining a solid fraction consisting mainly of hematite and an aqueous phase of sodium silicate, which showed contents of ca. 23% SiO2 and 19% Na2O. This sodium silicate obtained was then combined with IOT (25 and 50 wt.%) to produce geopolimeric material with excellent physicochemical properties, fast curing time and very good compressive strength results, which ranged from 41 to 58 MPa and many potential applications.

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来源期刊

Journal of the Brazilian Chemical Society 化学-化学综合

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3.4 months

期刊介绍： The Journal of the Brazilian Chemical Society embraces all aspects of chemistry except education, philosophy and history of chemistry. It is a medium for reporting selected original and significant contributions to new chemical knowledge.