In this study, octyl hydroxamic acid (HXMA-8) was used as an associate collector with NaOl in scheelite flotation. The flotation tests showed that a novel reagent scheme, i.e., a lower dosage of SS (300 mg/L) and mixed collectors of HXMA-8 + NaOl (total concentration 4.5 × 10 − 4 mol/L, preferred mass ratio of 1:2) achieved the selective separation of scheelite from calcite.
concentration des minerais par flottation sélective. Le minerai broyé, à une taille inférieure à 0,2 mm afin de libérer les différents minéraux constitutifs de la roche, est mis en suspension dans l'eau à laquelle sont additionnées des substances …
Sodium oleate (NaOl) acted as collector for scheelite. The flotation results showed that CLS had strong depressant effect on calcite flotation while exhibited little influence on scheelite flotation. Scheelite can be separated efficiently from scheelite-calcite mixed binary minerals in pH range of 7–11, when CLS was added prior to NaOl.
Scheelite can be separated efficiently from scheelite-calcite mixed binary minerals in pH range of 7–11, when CLS was added prior to NaOl. …
The composition of a collector directly affects its collecting performance in mineral flotation. In this study, three vegetable oils were used as the collectors, the flotation performance of scheelite and the differential analysis were studied through flotation experiments, zeta potential, contact angle measurement and Fourier transform infrared spectrum (FTIR) analysis. Flotation …
It is difficult to separate scheelite and barite by sodium silicate because of the closed inhibitory action for scheelite and barite. We choose alkyl sulfate as collector to repeatly select barite under the 1.5-3PH, and the product in tank is scheelite.
1、Flottation sélective de cuivre-cobalt à son tour . Dans ce processus, premièrement on sépare le cuivre et puis le cobalt, et on obtient le concentré de cuivre et le concentré de cobalt. La flottation sélective est applicable au …
The superplasticizer sulfonated acetone formaldehyde condensate (SAF) was first used as a depressant in the selective flotation of scheelite and calcite in this paper. First, single mineral flotation tests were performed to compare the depressing performance of SAF and the traditional depressant water glass. Results showed that both −0.074 + 0.037 mm and …
Previous studies have proved that the lead complexes of benzohydroxamic acid (Pb–BHA) are effective collectors of scheelite flotations; however, the separation of scheelite from calcite needs depressants with high selectivity. In this study, we reported a novel depressant for calcite minerals, and Pb–BHA served as the collector of scheelite. The …
The flotation separation of scheelite from calcite is problematic, where sodium silicate modified by polyvalent metal ions has shown some advantages for selective depression. In this study, an Al-Na2SiO3 polymer …
The traditional scheelite treatment process, which involves the sodium hydroxide decomposition and anion exchange, discharges a large amount of high-salinity wastewater, resulting in severe ...
The conventional experiments showed that Pb 2+ could enhance the flotation recovery of scheelite but suppress fluorite. AFM force curves showed that, due to the presence of Pb 2+, the interaction force between benzohydroxamic acid (BHA) and the scheelite surface was a stronger adhesion than the adhesion between BHA and fluorite without lead ions.
Scheelite and calcite are usually intergrown calcium minerals that are separated via froth flotation. However, their selective separation remains difficult because of their similar surface properties. 2-phosphonobutane 1, 2, 4-tricarboxylic acid (PBTCA or H5L) is widely used in water treatment due to its low phosphorus content and efficient anti-scaling performance.
Abstract. Xanthan gum (XG), a clean, non-toxic macromolecular polysaccharide, was studied as a depressant in the flotation separation of scheelite from calcite. Its selective inhibition mechanism was investigated by adsorption experiments, fourier transform infrared spectroscopy (FTIR) analysis and X-ray photoelectron spectroscopy (XPS) analysis.
Froth flotation of scheelite has regained new focus since the 2010s and research regarding floatability and reagents has made great progress over the years. The main objective was and remains the ...
The gold tailings from Gold Fields containing low scheelite values has a compled mineralogy with hornblende, quartz, arsenopyrite and calcite as major gangue minerals. The most difficult problem in scheelite flotation is not the removal of the siliceous or sulphide gangue, but the separation of Scheelite and calcite minerals which have similar surface properties.
In this study, a collector mixture of 733 and MES (sodium fatty acid methyl ester sulfonate) demonstrated a high selectivity for the flotation of scheelite from calcite and fluorite. An optimal mass ratio 4:1 of 733:MES was found, producing a 65.76% WO 3 concentrate grade with a recovery of 66.04% from a feed material containing only 0.57% WO 3.
La scheelite CaW)4 est caractérisée par les propriétés suivantes : - densité : 6 - fluorescence en lumière UV ... Essais de flottation et de floculation sélective au niveau laboratoire. Mise au point d'un projet d'installation pilote facilement déplaçable. 1.2. Le second minerai étudié provient de la région des Montmins ; la wol-
Tungsten and its alloys have been widely used in metallurgical machinery, petrochemical, construction, aerospace, and defense engineering [1,2,3].However, as the chief commercial source of tungsten, scheelite (CaWO 4) tends to coexist with other calcium-containing minerals, such as fluorite (CaF 2) and calcite (CaCO 3), in ore deposits [4,5,6].The flotation …
Physical Properties. Scheelite encompasses a broad range of colors, from bright orange, golden yellow, yellow-brown, brownish green to dark brown, pinkish to reddish gray, orange, pale gray, white and colorless. …
Scheelite and calcite are usually intergrown calcium minerals that are separated via froth flotation. However, their selective separation remains difficult because of their similar surface properties. 2-phosphonobutane −1, 2, 4-tricarboxylic acid (PBTCA or H 5 L) is widely used in water treatment due to its low phosphorus content and efficient anti-scaling performance.
1. Introduction. Scheelite (CaWO 4) is one of the main sources of tungsten, alongside with the other monotungstates stolzite (PbWO 4) and wolframite (a solid solution of ferberite (FeWO 4) and hübnerite (MnWO 4)).Scheelite is however more common and is found in approximately 65% of known tungsten deposits .Pale white to brown-orange, scheelite's main …
On a postulé que la flottation sélective de la chalcopyrite sous de telles conditions est reliée aux facteurs stériques qui empêchent le DETA de se coordonner avec les sites de cuivre de la matrice. Ainsi, les sites de cuivre continuent leur activité électrocatalytique lors de la conversion de l'ion sulfure en souffre élémentaire sur ...
The superplasticizer sulfonated acetone formaldehyde condensate (SAF) was first used as a depressant in the selective flotation of scheelite and calcite in this paper. First, single mineral flotation tests were performed to compare the depressing performance of SAF and the traditional depressant water glass. Results showed that both −0.074 + 0.037 mm and −0.037 mm …
A simplified flotation process for scheelite using complex collector has been successfully applied in industry, significantly improving the recovery of scheelite. This high selectivity makes metal–organic complex a novel and promising collector for high-efficiency mineral flotation and contributes to the efficient and clean development of ...
The depressing properties of sodium polyacrylate (PA-Na) for scheelite and fluorite were studied by micro-flotation tests, infrared spectroscopy (IR), zeta potentials, X-ray photoelectron spectroscopy (XPS), and density …
Collector 733, a sodium soap (C 12 – 16 COONa) is widely used industrially for scheelite flotation. Low selectivity of 733 collector is always observed. In this study, a collector mixture of 733 and MES (sodium fatty acid methyl ester sulfonate) demonstrated a high selectivity for the flotation of scheelite from calcite and fluorite.
A study of depressants dosage allowed to reach a selective flotation of scheelite from calcium minerals at 1125 g/t, except from fluorite. The use of sodium carbonate with …
La réduction catalytique sélective est une réaction chimique qui transforme les NOx en azote et en vapeur d'eau pour diminuer les émissions d'oxydes d'azote et donc la pollution issue de la combustion d'un moteur thermique. Pour cela, le SCR fonctionne grâce à de l' AdBlue, un liquide qui est injecté dans l' échappement par le système.
Scheelite was selectively floated from a low-grade calcitic run-of-mine ore (containing 0.28% WO3, 96.3% CaCO3 and 2.24% SiO2) with a 70.6% WO3 grade and a 70% recovery, using oleoyl sarcosine as ...
Sodium oleate (NaOl) acted as collector for scheelite. The flotation results showed that CLS had strong depressant effect on calcite flotation while exhibited little influence on scheelite flotation. Scheelite can be separated efficiently from scheelite-calcite mixed binary minerals in pH range of 7–11, when CLS was added prior to NaOl.
