Effect of mechanical grinding on pozzolanic activity and hydration properties of siliceous gold ore tailings

Yao, Geng; Liu, Qing; Wang, Junxiang; Wu, Peng; Lyu, Xianjun

doi:10.1016/j.jclepro.2019.01.175

Cited by 121 publications

(30 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amount of mine tailings has grown excessively with an ever increasing demand for metal and mineral resources [95]. Mining wastes are produced during mineral extraction by the mining industry and is at present one of the largest waste flows worldwide [25,95,96]. Mine tailings are finely ground in the time of mineral processing and separation of minerals of interest [96].…”

Section: Sio2mentioning

confidence: 99%

“…A significant part of milling processes and separation procedure uses water as the transport medium. Therefore, tailings obtained by mining enterprises usually consist of small particle slurries with high water content, flow ability and poor mechanical stability [95]. Mine tailings are deposited in dammed ponds along with industrial wastewater or as thickened pastes in piles close to the extraction sites [96].…”

Section: Sio2mentioning

confidence: 99%

“…Therefore, depositories of tailings have lately gained global attention [95]. However, despite the potential of mine tailings as substitutes in the production of cementitious materials, there is a striking lack of studies regarding this topic in the cement and concrete literature.…”

Section: Sio2mentioning

confidence: 99%

See 2 more Smart Citations

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

View full text Add to dashboard Cite

A sustainable solution for the global construction industry can be partial substitution of Ordinary Portland Cement (OPC) by use of supplementary cementitious materials (SCMs) sourced from industrial end-of-life (EOL) products that contain calcareous, siliceous and aluminous materials. Candidate EOL materials include fly ash (FA), silica fume (SF), natural pozzolanic materials like sugarcane bagasse ash (SBA), palm oil fuel ash (POFA), rice husk ash (RHA), mine tailings, marble dust, construction and demolition debris (CDD). Studies have revealed these materials to be cementitious and/or pozzolanic in nature. Their use as SCMs would decrease the amount of cement used in the production of concrete, decreasing carbon emissions associated with cement production. In addition to cement substitution, EOL products as SCMs have also served as coarse and also fine aggregates in the production of eco-friendly concretes.

show abstract

Section: Sio2mentioning

confidence: 99%

Section: Sio2mentioning

confidence: 99%

See 1 more Smart Citation

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Peak 4 corresponds to an endothermic reaction located at about 420°C, which is characteristic of the dehydration of portlandite (CH) (Ma et al, 2018). The peak 5, located close to 750°C, is characteristic of the decomposition of various carbonates, mainly the calcium carbonate (CaCO3), from the raw material and the possible carbonation of some phases (Yao, Liu, Wang, Wu, & Lyu, 2019). The pozzolanic effect was analyzed from peak 4 of the DTG by measuring the consumption of calcium hydroxide in the presence of RM, the difference in this peak at 180 days of curing is due to a decrease of weight loss and the portlandite content in the paste with RM.…”

Section: Pozzolanic Activity Of Rmmentioning

confidence: 99%

Effects of the incorporation of residue of masonry on the properties of cementitious mortars

Silva¹,

Lange²,

Delvasto³

2020

rdlc

View full text Add to dashboard Cite

This paper presents results of an experimental study of a residue of masonry (RM), sampled from a construction and demolition waste (CDW), added as a supplementary cementitious material (SCM) to partially replace up to 50% of Portland cement in the preparation of mortars. The pozzolanic activity (fixed lime and strength activity index), setting time, heat of hydration, the (autogenous and drying) shrinkage and compressive strength tests were carried out. The results show how the RM has a positive activity because the increase of RM replacement level in the mortars generates a lower heat of hydration and autogenous and drying shrinkage. The fixed lime at 28 and 180 days, indicating that the RM exhibits in some degree pozzolanic activity and the Strength Activity Index (SAI) was 77.13% and 84.36% of the compressive strength of 100% OPC mortar at the 7 and 28 days respectively, which conformed to ASTM C311. These results indicate that RM should be considered appropriated for using as a supplementary cementitious material.

show abstract

“…Ore tailings are the solid wastes produced by flotation [10][11][12], gravity concentration [13], and other separation of minerals [14]. Economic developments have greatly increased the demand for mineral products, as well as the scale of mining development [15,16]. China has produced more than 25 billion tons of ore tailings [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Portland Cement with Gold Ore Tailings

Wang

Yao

Zhu

et al. 2019

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

e disposal of gold ore tailings (GTs) has been a very difficult problem for a long time. us, this study explored a new approach to the management of GTs by preparing Portland cement. Physical properties, reaction mechanisms, and hydration product types of cement prepared with GTs (C-GTs) and ordinary Portland cement (C-SS) were compared. X-ray diffraction (XRD), thermogravimetric (TG), and scanning electron microscope energy-dispersive spectroscopy (SEM-EDS) analysis techniques were used to study the mineralogical phases of the clinker and raw materials, hydration product types, and microtopography. e consistency, setting time, flexural strength and compressive strength values of the cement samples (C-GTs and C-SS), and burnability of the raw materials were also studied. e burnability analysis indicated that GTs provided a higher reactivity. e XRD results showed that the clinker phases of the C-GTs were C 3 S, C 2 S, C 3 A, and C 4 AF. e XRD, TG, and SEM-EDS results showed that the hydration products were flaky calcium hydroxide, rod-shaped ettringite, and granular C-S-H gels. Its compressive strength and flexural strength were, respectively, 30.4 MPa and 6.1 MPa at the curing age of 3 days and 59.1 MPa and 9.8 MPa at the curing age of 28 days, which were slightly higher than those of the C-SS. Furthermore, the results showed that the consistency, initial setting time, and final setting time for the two kinds of cement were similar, which further suggested that GTs could be used to prepare Portland cement.

show abstract

Effect of mechanical grinding on pozzolanic activity and hydration properties of siliceous gold ore tailings

Cited by 121 publications

References 42 publications

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

Effects of the incorporation of residue of masonry on the properties of cementitious mortars

Preparation of Portland Cement with Gold Ore Tailings

Contact Info

Product

Resources

About