قائمة الطعام
In this study, to enhance the flotation of fine-grained fluorite, a strategy that combines simultaneous grinding and surface modification via ball-milling and …
The fluorite recovery in calcium solution holds the line relatively, while it shows a slightly decrease with the gypsum solution concentration increased. The mixed binary mineral flotation in Fig ...
Experimental study on the electrokinetic and flotation behaviour of fluorite in solutions of n-alkylammonium chlorides (with 10, 12 and 14 carbon atoms) is given. The zero point of charge (ZPC) of ...
Abstract Cassiterite flotation is achieved industrially with some anionic collectors. However, the presence of fluorite in primary tin ores usually poses a problem in relation to the selectivity between the two minerals. In this work, a comparative study was undertaken involving adsorption, electrophoretic mobility and suspension stability …
Froth flotation is reported to be the most efficient and economically viable process for the production of an acid-grade product with a CaF2 content of at least 97%. Selective flotation of fluorite from gangue minerals, e.g., …
Fig. 7. E®ect of oleic acid dosage on °otation grade and. recoveries of °uorite at 22 C and pH ¼9. Improving Fluorite Flotation under Low Temperature and Neutral pH Conditions. December 5 ...
As an important strategic non-metallic mineral resource, fluorite has been widely used in various industrial fields, such as metallurgy, optics and semiconductor manufacturing, as well as fluorine-related chemical engineering. Since the major gangue minerals of fluorite ore are silicate and carbonate ones, flotation is the main …
The results of flotation tests showed that highly selective separation of fluorite from barite was obtained when 250 mg/dm3 of modified starch and 13.16×10−5 mol/dm3 sodium oleate was used in neutral solutions. FTIR spectra results showed that the modified starch can adsorb on the fluorite and barite surfaces.
Finally, the most widely seen fluorite-flotation cases, including separation of fluorite from quartz, calcite, barite, and sulfide, are summarized individually. The present review sheds new light on the deep understanding of fluorite flotation, the future …
The seed crystal, fluorite, helps improve the growth of perfect CaF 2 crystals. The solution and interfacial behaviors of the ions were calculated by molecular simulations. The existing perfect surface of fluorite was proven to provide the active sites for ion adhesion and formed a more ordered attachment layer than the precipitation procedure.
Normally fluorite was collected by fatty acid collectors at pH 5–11, rendering the surface to be hydrophobic. In this study, we found that fluorite surfaces are naturally hydrophobic at high pH without any surfactant, which is beneficial for the selective flotation separation of fluorite from calcite.In a flotation test, fluorite recovery showed a …
Fluorite was the only fluorine mineral that could form industrial deposits, and flotation was the most important separation method in the process of low-grade fluorite ore (Gao et al., 2021;Kienko ...
Scheelite and fluorite are often associated with raw ores (Foucaud et al., 2018, Gao et al., 2015a).The separation of scheelite from fluorite has been achieved in an alkaline pulp within pH 9–10 (Han et al., 2020). pH = 9 has been previously reported as the most suitable pH condition for the flotation separation of fluorite from its mixture with …
The solution chemistry of sodium silicate and microflotation tests showed that SiO(OH)3⁻ in the Na2SiO3 solution strongly inhibited fluorite flotation, while H4SiO4 and SiO2(am) showed only weak ...
Fluorite (CaF 2) is by far the most important fluorine-bearing mineral phase in the Earth's crust.It is mostly used for manufacturing glass, cement, fillers, and hydrofluoric acid, and as a flux in steel-making in various industries [1,2,3].In order to obtain high grade fluorite raw materials (CaF 2 ≥ 97%), froth flotation has been the most commonly used …
XFG flotation machine was utilized for flotation experiments and the stirring speed was fixed at 1400 rpm. For each flotation experiment, 2.0 g of mineral particles and 40 mL of ultrapure water were added to a flotation cell, and the mixture was conditioned with acid/base solutions to the desired pH value (shown in the captions of Fig. 2,3 and 4).
Based on the optimum flotation results of pH 9 and sodium oleate concentration at 2.5 × 10−4 mol/L, the flota-tion recovery of scheelite and fluorite in different calcium solution are shown in ...
In this study, the activation mechanisms of fluorite inhibited using Na 2 SiO 3 by adjusting the solution pH to neutral and slightly alkaline conditions were investigated. The solution chemistry of sodium silicate and microflotation tests showed that SiO(OH) 3 − in the Na 2 SiO 3 solution strongly inhibited fluorite flotation, while H 4 SiO 4 and SiO …
Abstract. The efficient separation of fluorite and calcite is a challenging task in the field of mineral processing because of their similar chemical and physical properties. In this research, octylamino- bis - (butanohydroxamic acid) (OBHA) was introduced as collector into a flotation system comprising fluorite and calcite, and the separation ...
In the case of fluorite/quartz flotation, although CMC could not adsorb on the surface of quartz due to the strong negative charges on quartz surfaces at pH 9.0, the strong electrostatic repulsion ...
In addition, the flotation results of the tailings from Jiangxi containing fluorite and calcite, indicated that the grade and recovery of fluorite increased from 87.18% and 40.99% for 0 days to 93 ...
Fluorite is commercially named fluorspar composed of calcium fluoride (CaF2). It is the principal source of fluorine. The same is used in the production of hydrofluoric acid, which is used in a wide variety of industrial applications including glass etching. Fluorite tends to occur in well-formed isometric crystals, forming cubes and …
In the presence of NaOl alone, the hydrophilic heads of the oleate species are chemisorbed on the bastnaesite surface, with the hydrophobic tails exposed to the solution, resulting in bastnaesite flotation. After treatment with the fluorite or barite supernatant, Ca 2+ or Ba 2+ from the fluorite or barite supernatant form …
Flotation is the most efficient method to recover this type of fluorite. Fluorite and calcite contain Ca 2+. During flotation, the physical and chemical properties of the …
Fluorite, as a scarce nonrenewable strategic non-metallic mineral resource, is the primary raw material for fluorine products used in diverse fields such as metallurgy, national …
Adsorption of oleate species at the fluorite-aqueous solution interface. R. Sivamohan, P. De Donato, and ; J. M. Cases; Cite this: Langmuir 1990, 6, 3, 637–644. Publication Date (Print ... Understanding the depression mechanism of sodium citrate on apatite flotation. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2020, 588 ...
In each flotation test, a total mass of 2 g of mixed minerals (at a mass ratio of 1:1 of bastnaesite and fluorite) was dispersed in 35 mL distilled water (Mlipore deionized, resistivity of 18.25 MΩ cm). Fig. 1 shows the flotation circuits of artificially mixed minerals. The pH of the suspension was modified by the addition of HCl or NaOH at 8.5.
The aim of this work is to determine the effect of PA on the interaction of scheelite with fluorite. Micro-flotation tests, zeta-potential measurements, solution chemistry, Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS) analysis are employed to shed light on the relationship between the flotation mechanism …
Fluorite is a non-metallic raw material with strategic significance, mainly used in the three major industries of metallurgy, chemical industry and building materials, followed by light industry, …
Solution chemistry and flotation studies were made of dodecylamine and oleic acid collectors with fluorite particles. From solution equilibria diagrams, the surface tension, electrophoretic ...
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