Evaluation of the effect of sodium silicate addition to mine backfill, Gelfill − Part 1

Kermani, Mehrdad; Hassani, Ferri; Aflaki, Esmail; Benzaazoua, Mostafa; Nokken, Michelle

doi:10.1016/j.jrmge.2015.03.006

Cited by 23 publications

(9 citation statements)

References 12 publications

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“…Cihangir et al [22] reported that the cement-related costs were significantly reduced (35%) to achieve an equal strength of 1 MPa for 28-day cured CPB samples, increasing the corresponding mechanical strength gain. Kermani et al [23,24] also reported that the addition of a proper amount of an alkali activator such as sodium silicate could improve the backfill's strength, drainage, and microstructural properties. Addition of sodium silicate to the CTB mix can reduce the total porosity and the required setting time of the backfill, contributing to an increase in the backfill strength and ore production.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

et al. 2018

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With the use of glauberite mineral (GM) and sodium hydroxide (SH) alkaline catalysts to stimulate slag powder’s internal cementation activity and incorporate the two fine-grained solid wastes, such as quicklime (Q) and desulfurized ash (DA), a new cementitious material suitable for mine tailings was developed to replace traditional ordinary Portland cement (OPC) for reducing cement-related costs. A series of uniaxial compressive strength (UCS) tests were carried out on cemented tailings backfill (CTB) samples containing different activators. The results showed that (1) the highest UCS values of 14-day and 28-day cured CTB samples were 1.259 MPa and 2.429 MPa, respectively, and the effect of different activator types was in the order of SH > GM > DA > Q and SH > GM > Q > DA; (2) the relationship between UCS and activator dosages followed the function y = ax3 − bx2 + cx − d. Compared with the OPC 32.5 R cemented samples, the minimum strength growth factor was 1.45, and the maximum reached 2.03; (3) the optimal proportion of DA slag formula was 4.5% or 5.0% Q, 19% DA, 2.5% GM, and 0.7% SH. The aforesaid new cementitious materials met the mine’s UCS requirements with a relatively low cost (17.04–17.20 €/ton) and solved the stacking problem of solid wastes on the surface well. Ultimately, this study provides a useful reference for the development of mineral binders.

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Section: Introductionmentioning

confidence: 99%

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

et al. 2018

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“…Fig. 13 Mineralogical groups forming layers in granite, migmatite gneiss, and schist basement complexes However, albite, which is sodium feldspar, has been shown by Moayedi et al (2011) to have reacted and altered to kaolinite as observed in this lower stratum: Similar reaction by albite to form illite was given as: Alteration of kaolinite minerals to illite minerals as reported by Kermani et al (2015) is also possible and is probably taking place in this stratum through the reaction:…”

Section: Overburden On Schist Basement Complexmentioning

confidence: 52%

Effect of mineralogy on physico-chemical and some geotechnical properties of soils developed over granite, schist, and migmatite gneiss: a case study of Minna, Central Nigeria

et al. 2021

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Results of influence of mineralogy on physico-chemical and some geotechnical properties of soils developed over granite, schist, and migmatite gneiss around Minna in central Nigeria are presented. A region around Minna was studied to obtain the structure and petrography of the rocks. Three trial pits taken to depths of 5.0, 3.5, and 4.0m were dogged within region of granites, schists, and migmatite gneiss rocks, respectively, all of which belong to Basement Complex of northern Nigeria, to study the mineralogical, physico-chemical, and some geotechnical properties of overburden soils over these rocks. In each of the trial pits, soil samples were collected at interval of 0.5m depths to terminal depths of the pits. X-ray diffraction, index properties, and compaction tests were carried out the samples, and the results were analyzed to determine the influence of mineralogy on physico-chemical and some geotechnical properties of the soils. The result showed that rate of weathering is higher in granite rocks, where primary minerals altered to secondary minerals including smectite minerals. This is followed by overburden over schists, which was observed to alter to secondary minerals like illite and kaolinite. Overburden soil over migmatite gneiss did not showed alteration to secondary minerals but conversion of the carbon element to sodium carbonate salt. Higher fines content, cation exchange capacity, and Atterberg limits, recorded from soils developed over granite rocks, probably resulted from the smectite minerals recorded within this profile. The non-plastic nature of soils, on schist rocks, despite presence of secondary minerals, and judging from the low natural moisture content observed within this profile, indicated that the minerals developed under poor drainage condition. It was therefore concluded that mineralogy of overburden soils over basement complexes and the drainage condition during formation affect their geotechnical properties.

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“…The work of Moayedi et al [26] on effect of stabilizing soft clay with small percentage of sodium silicate showed that highest strength was obtained on addition of 5 mol/L sodium silicate. The use of sodium silicate in mine back-fill was also reported by Kermani et al [27] in which series of laboratory experiments were carried out on gelfill and cemented hydraulic fill. Using UCS as evaluation criteria, the results showed that addition of appropriate amount of sodium silicate tremendously increased the strength and water retention properties of the backfill.…”

Section: Introductionmentioning

confidence: 57%

Microstructural Investigation and Strength Properties of Clay Stabilized With Cement, Rice Husk Ash and Promoter

et al. 2020

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A clay soil, classified as Clay of High plasticity (CH) according to Unified Soil Classification System (USCS) was stabilized with cement, Rice Husk Ash (RHA) and promoter. The mineralogy of the clay soil and the morphology of the clay and clay specimens admixed with varied composition of cement, RHA and promoter were evaluated in order to determine effect of the RHA on promoter stabilization of cement based clay soil. The promoter used in this study consists of calcium chloride and sodium hydroxide in the ratio of 1:1. The clay was remolded at standard Proctor compaction energy and the specimens were mixed with 0, 1.0, 2.0 and 3.0% cement, admixed with 1.0, 2.0, 3.0% RHA each, and 0.3, 0.6, 1.0% promoter each. The molded specimens were cured for 1, 7, 14, 28, 60 and 90days before testing for Unconfined Compressive Strength (UCS) and consequently the modulus of elasticity. The UCS of specimens without cement increased from 20 kN/m2 for the natural clay soil to 95 kN/m2 on addition of 3% RHA and 1.0% promoter after 28 days of curing, representing 475% increase in the UCS. This increase was confirmed by morphology of the clay soil mixed with RHA and promoter only, which showed presence of calcium silicate hydrate. Addition of 3.0% cement with 3 and 1.0% RHA and promoter respectively, increased the UCS from 220 to 375kN/m2 after 28 days of curing, which was also confirmed by the morphology of the specimens. The highest elastic modulus of 48.3 MPa was observed at specimens containing 3% cement, 3% RHA and 1.0% promoter.

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Evaluation of the effect of sodium silicate addition to mine backfill, Gelfill − Part 1

Cited by 23 publications

References 12 publications

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Effect of mineralogy on physico-chemical and some geotechnical properties of soils developed over granite, schist, and migmatite gneiss: a case study of Minna, Central Nigeria

Microstructural Investigation and Strength Properties of Clay Stabilized With Cement, Rice Husk Ash and Promoter

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