Scheelite recovery a) depending on the flotation time and b) against the recovery of the semi-soluble salt-type minerals (at flotation times 1, 3 and 7 min) Fig. 2. Scheelite recovery against a) the sulfide recovery and b) silicates recovery (at flotation times 1, 3 and 7min) In the feed, ~97.7% of the scheelite surface is more than 80% liberated.
The selectivity of scheelite flotation increased when the amount of SF2 depressant addition increased to 1200 g/ton, but it decreased by adding 1400 g/ton SF2, which would result from the ...
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. …
Various reagents suitable for scheelite flotation (collectors and depressants, mostly) are reviewed in the present work, with a strong focus on the separation of scheelite from …
Scheelite associated with calcium-containing minerals such as calcite and fluorite is difficult to separate by flotation because of the Ca ions contained in the mineral lattices, which cause scheelite to have similar surface properties and floatability to gangue minerals. Traditional collectors such as oleic acid need to add a large amount of sodium …
scheelite (CaWO4) associated with complex gangue minerals, i.e., minerals that display similar properties, particularly surface properties, compared to scheelite. Consistently, the froth flotation of scheelite still remains, in the twenty first century, a strong scientific, industrial, and technical challenge.
Carboxylic acids, particularly fatty acids, are the main collectors in use in froth flotation of scheelite (Yin & Wang, 2014). ... (Bulatovic, 2007; Nagaraj & Ravishankar, 2007). Oleates indeed ...
Various reagents suitable for scheelite flotation (collectors and depressants, mostly) are reviewed in the present work, with a strong focus on the separation of scheelite from calcium salts, namely, fluorite, …
The flotation experiments results showed that ATMP exhibited an intense inhibition effect on the flotation of apatite rather than scheelite. A satisfactory separation result with scheelite recovery of 85.22% and apatite recovery of 23.6% was achieved when ATMP was used as the depressant in the sodium oleate (NaOL) system.
Bulatovic, S.M., 2007. Handbook of flotation reagents (1st Ed.), Vol.1, Elsevier Science & Technology, Amsterdam, Netherlands. ... Froth flotation of scheelite has regained new focus since the ...
A scheelite concentrate is recovered from scheelite ore using a froth flotation process which involves grinding the ore sufficiently to liberate scheelite grains. Flotation …
Scheelite (CaWO 4) and wolframite ((Fe, Mn)WO 4) are the only tungsten minerals mined commercially and are mainly found in five types of deposits: skarn, vein/stockwork, porphyry, disseminated and stratabound.Gravity concentration and flotation are the beneficiation techniques most commonly applied to scheelite ore, and …
The focus of the thesis is to understand the mechanism of two important depressants in scheelite flotation, sodium carbonate and acidified water glass (AWG), and linking said mechanism to process ...
The results of pure scheelite flotation show thatscheelite ground by CB has a better floatability than that ground by CIB, and the deleterious effect of CIB grinding on the flotation behavior of scheelites is verified by the actual scheelITE ore flotation experiments. ... High intensity conditioning — a new approach to improving flotation of ...
Gravity separation techniques produce finer particles that cause the loss of significant amounts of Ta/Nb in the fine fraction and overflow slimes (Bulatovic, 2010). Froth flotation is ...
Srdjan M. Bulatovic. Handbook of Flotation Reagents: Chemistry, Theory and Practice. ... Flotation processing characteristics of rutile from hard rock ore and sand deposits are very much dependent on two major factors: mineral composition of the ore and impurities present in the rutile. Although it has been pointed out by some researchers …
In the case of scheelite flotation, literature has shown that sodium carbonate improves flotation performance but little is said as to selectivity against gangue minerals. ... Sodium carbonate (or soda ash) is therefore a buffering pH modifier (Allan and Woodcock, 2001, Yuhua et al., 2011, Bulatovic, 2015), a pulp dispersant (Zheng and Smith ...
The development of flotation chemistry has promoted the progress of scheelite flotation reagents and processes. Fatty acid is the earliest anionic collector …
The crystal structure of scheelite belongs to the tetragonal system, with a space group of I4 1 /a and cell parameters of a = b = 0.5243 nm, c = 1.1376 nm, α = β = γ = 90°, and Z = 4 (Gao et al., 2016b).As shown in Fig. 1 (a), the complex anion in the crystal is a W–O 4 tetrahedron, formed by the combination of W 6+ and four O 2-and Ca 2+ ions, …
The collecting ability of dodecylamine (DDA) and dodecyltrimethylammonium chloride (DTAC) as two cationic collectors was investigated in the flotation of pyrolusite and calcite by carrying out the flotation experiments, FTIR analysis, zeta potential tests and contact angle measurements. The single mineral flotation experiments show that …
The flotation separation (FS) of both scheelite and calcite minerals with similar physicochemical properties remains challenging, since the Ca active sites exist on their surfaces.
Through batch flotation testwork on a skarn scheelite ore, single mineral flotation and contact angle measurements, this article aims at demonstrating that sodium carbonate is a multi-faceted reagent, which serves as a buffering pH modifier, a pulp dispersant precipitating calcium ions in suspension and a depressant for calcite and …
This paper proposes luteolin (LUT) as a novel depressant for the flotation-based separation of scheelite and calcite in a sodium oleate (NaOL) system. The suitability of LUT as a calcite depressant is confirmed through micro-flotation testing. At pH = 9, with LUT concentration of 50 mg·L−1 and NaOL concentration of 50 mg·L−1, scheelite …
Figure 9 shows the FTIR analysis results for scheelite, where the spectrum of sodium oleate forms the bands at 1559.1 and 2922.6 cm −1 . The band at 2922.6 cm −1 is known to be formed by the ...
This article aims at reviewing the research conducted on solubility and electrokinetic properties of scheelite as well as establishing a landscape of flotation …
1. Introduction. Scheelite is the principle mineral of tungsten and is usually recovered by froth flotation. Froth flotation is a physico-chemical separation process that utilizes the difference in surface properties of the valuable minerals and the unwanted gangue minerals (Wills and Napier-Munn, 2005).Due to the brittle nature of scheelite …
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 selective flotation of scheelite from other calcium-bearing minerals, in particular calcite, fluorite and apatite. ... Bulatovic S. Beneficiation …
Flotation results revealed that the selective depression effect of PA-Na was better than that of sodium silicate (Na 2 SiO 3), and PA-Na can depress calcite more effectively than scheelite. The flotation recovery of scheelite and calcite kept at about 75% and 15% respectively at the pulp pH 9.3~9.6 and PA-Na concentration from 37.5 mg/dm 3 to ...
