— The geopolymerization of solid substances rich in calcium and aluminum including mine tailings by sodium silicate is mainly believed to be under the influence of alkali activation.
— A series of (SiO 2) 0.7−x (Na 2 O) 0.3 (Fe 2 O 3) x glasses (0.0 ≤ x ≤ 0.18) were prepared and investigated by means of X-ray photoelectron spectroscopy (XPS). The quantitative ratio [Fe 2+]/[Fe total], for each glass has been determined from an analysis of the Fe 3p spectra.For low Fe 2 O 3 content both iron valencies are present, however, it …
— Sodium silicate can bind mine tailings through geopolymerization. ... The typical stretching bands at 528 and 3610 cm −1 in tailings specimens respectively present iron species and concentrated –OH groups on their surfaces [60], [61]. All the emerged peaks in sample 3 are originated from either tailings or silica gel, meaning no secondary ...
— The use of sodium silicate, sodium hydroxide and sodium hexa-metaphosphate resulted in 0.37, 0.44 and 0.50% ball wear, respectively, compared to 0.55% observed for the blank (without GA). This observation can be attributed to the improved fluidity of the slurry which reduces the frictional wear on the grinding media …
— This study evaluated the use of iron ore tailings (IOT) as a source of silica (SiO2) to produce an alternative form of sodium silicate (SS) for use as an activator in one-part geopolymer binders.
— ABSTRACT Mining is facing a transformation in terms of environmental and social performance with improved mine waste management practices required. The …
Flotation Reagents - 911 Metallurgist
Used as a starting material for zeolites and silica catalysts, as an adhesive and binder, corrosion inhibitor, penetrating sealant, in cements, drilling fluids, for fireproofing wood, paper, and fabric, as a detergent booster, in waste water treatment, and as shell coating to preserve eggs; [Merck Index] Used in boiler compounds, cleaners (laundry, dairy, floor, …
Keywords: Acid mine drainage Silica gel Sodium silicate Encapsulant Iron ion A B S T R A C T Upon neutralization by acid mine drainage (AMD) a semi-solid silica gel forms from sodium silicate. During the solidification of silica gel, the surrounding
DOI: 10.1016/J.MATLET.2021.129333 Corpus ID: 233579637; Producing sodium silicate powder from iron ore tailings for use as an activator in one-part geopolymer binders @article{Figueiredo2021ProducingSS, title={Producing sodium silicate powder from iron ore tailings for use as an activator in one-part geopolymer binders}, author={Ricardo …
— A hydrometallurgical method of alumina and silica gangue removal from rejects slime of iron ore by alkali and acid leaching is proposed. Up to about 80% gangue is removed by chemical leaching with sodium hydroxide, sulphuric, hydrochloric and nitric acids.Although sulphuric acid is the most effective among the acids, it suffers from a …
— The glasses were prepared in 0.9Pt/0.1Rh crucibles in air at 1400 °C.The mixtures were made from analytically pure materials. The sodium carbonate, silica, natural iron oxide (or iron oxide reached by 57 Fe 2 O 3) provided Na 2 O, SiO 2 and Fe 2 O 3 respectively. The following compositions of glass matrixes were chosen (100 − x, mol%) …
— Among various mine tailings as source material for geopolymer the copper mine tailings (CMTs), iron mine tailings (IMTs), and gold mine tailings (GMTs) are widely researched as is summarized in Table 1.In the geopolymer, they are often mixed with other alumina silicate source materials e.g. fly ash, blast furnace slag, metakaolin, copper …
— Sodium silicate (a kind of inorganic dispersant) and citric acid (a kind of organic dispersant) are often used as dispersants in the flotation of fine minerals [7, 8].Mark [9] investigated the dispersive effects of sodium silicate and concluded that a significant dispersive effect could be gained at pH 7.Luo [10] reported that the flotation …
Effects of Several Ions on Iron Treatment by Sodium Silicate and Hypochlorite. Journal AWWA 1987, 79 (7), 116-125. https://doi/10.1002/j.1551-8833.1987.tb02882.x. F. …
— This study has demonstrated that it is possible to use iron ore tailings as a SiO 2 source in the production of an alternative sodium silicate powder to be employed in the synthesis of one-part geopolymers. This can help reduce the disposal of mining waste.
— Tailings from gold mines gradually approach ultra-fine, making mine backfill costs higher and strength lower, which poses a serious threat to the safety of underground personnel and equipment. It is well …
Producing sodium silicate powder from iron ore tailings for use as an activator in one-part geopolymer binders Ricardo A.M. Figueiredo a,*, Paulo R.G. Brandão a, Marios Soutsos
Mine tailings-based AAMs can exhibit compressive strengths of 5–20 MPa [12,13,14], but the loosely held alkali ions are easily dissolved in water and the aluminosilicate gel can be destroyed by immersion in water.Studies such as [15,16,17,18] have indeed reported poor hydrolytic stability for alkali-activated mine tailings specimens with a strength loss of …
The role of sodium silicate in the anionic flotation of a Floridaphosphate ore was investigated using laboratory continuous flotation tests, frothability tests and SEM observations.In the absence of sodium silicate, Ca++ promoted the unwanted activation of quartz by forming calcium bearing precipitates.The addition of sodium silicate enhanced …
This study evaluated the use of iron ore tailings (IOT) as a source of silica (SiO2) to produce an alternative form of sodium silicate (SS) for use as an activator in one-part geopolymer …
— Sodium silicate is also used in this process as a dispersant of fine particles. The phosphorus content can be easily reduced to an acceptable level of less than 0.025 wt% P by increasing collector dosage. ... Flotation of iron ore. 8th Annual Mining Symposium, Duluth, Minnesota, U.S.A. [3] Krishnan, S.V., Iwasaki, I., 1984. Pulp …
— Field studies were conducted at five water systems that used sodium silicate and chlorine to sequester iron and manganese. Sequestering was generally successful in four of the systems but was unsuccessful in one system that was not adding the silicate and chlorine nearly simultaneously.
— When the dosage of sodium silicate was 0.8%, the particle size of D 90 decreased by 17.58 μm, and the particle contents of −10 μm and −20 μm increased by 18.25 and 21.39 percentage points, respectively. (2) The SiO(OH) 3 − hydrolyzed by sodium silicate changed the binding energy of Si2p and Al2p and the content of Si-OH …
— Therefore, it is important to determine the adhesion property to investigate the performance of glass lubricants. To explain the adhesion effect of sodium silicate glass on iron oxide surface, we investigated the Si atoms near the top surface by averaging their displacements from the initial position along the sliding direction.
1.Overview (1) Sodium silicate, also known as silicate of soda, it is a dispersion system of sodium silicate, potassium silicate, lithium silicate and quaternary ammonium silicate in water with the coexistence of ions, molecules and colloidal particles of silicate. (2)The appearance of pure sodium silicate is a colorless transparent viscous liquid. It becomes …
— The alkaline solution was produced from a commercial solution of sodium silicate Na2SiO3 (SS) and a 10M solution of sodium hydroxide NaOH (SH) prepared from solid flakes (3:1 mass ratio of SS:SH).
— It is also possible to identify the use of "sodium hydroxide/NaOH," "KOH," and "sodium silicate" as being the most used activators. ... Becker F, Eser RA, Hoelzmann P, Schuett B (2019) The environmental impact of ancient iron mining and smelting on Elba Island, Italy–A geochemical soil survey of the Magazzini site. J Geochem ...
— The XPS spectrum in Fig. 2 a discloses the presence of C 1s, Na 1s, Fe 2p, Si 2s, Si 2p, and O 1s in NFSO-C. The high-resolution XPS of Fe 2p is presented in Fig. 2 b, which contains two parts (Fe 2p 3/3 and Fe 2p 1/2) due to spin-orbit coupling [32].The binding energy at 710. 1 and 725.5 eV can be attributed to Fe 2p 3/2 and Fe 2p 1/2, …
To mimic a typical complex, low-grade REE-bearing iron-oxide-silicate-rich tailings, low-grade mixtures (0.83% TREO grade) were tested with the fatty acids (oleic acid and sodium oleate) and hydroxamic acid in the absence and presence of sodium silicate and starch as depressants . Both depressants were effective in selectively decreasing the ...
— For dispersant-kaolinite interactions, it was found that sodium silicate, a standard dispersant widely used in iron ore flotation for silicate gangue minerals, is …
— Iron ore mining is one of the most significant players in the resource sector in Western Australia (WA), and it accounts for about 47% of the total value of all resources in the state [1]. ... In this study, the sodium silicate was added to the mine tailings in powder form, as an activator for the formulation of the geopolymer bricks. The ...
— A high dosage of sodium silicate inhibits the depolymerization of the source material, which results in a sample with less amorphous aluminosilicate gel and, therefore, lower hydrolytic stability. ... (Al + Fe) ratio was 1.6. The specific contaminants of concern in these gold mine tailings include chromium, arsenic, iron, copper, and zinc.
— This study evaluated the use of iron ore tailings (IOT) as a source of silica (SiO2) to produce an alternative form of sodium silicate (SS) for use as an activator in …
Semantic Scholar extracted view of "Geopolymerization mechanism of binder-free mine tailings by sodium silicate" by Babak Koohestani et al. ... pyrite, as a major mineral in sulfidic mine tailings, can transform to iron oxides. Generated iron oxides, if exhibiting enough magnetic properties, can be … Expand. 30. PDF. Save.
— Similarly, sodium silicate, a good dispersant for silicates present in iron ore does not disperse any kaolinite (Ma et al., 2009a). Taking into consideration all the above facts, we aimed to seek a thorough understanding of the difference in the flotation response of a quartz rich and an alumina rich ore in a comprehensive manner.
Keywords: Acid mine drainage Silica gel Sodium silicate Encapsulant Iron ion A B S T R A C T Upon neutralization by acid mine drainage (AMD) a semi-solid silica gel forms from sodium silicate. During the solidification …
— In this context, the present work brings the use of iron ore mining waste for an alternative production of a binder. The IOT Binder uses a differentiated production of …
