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.

Reagent mixture exhibits a number of synergistic advantage than single surfactant (Bulatovic and Wyslouzil, 1995, ... (Dong et al., 2018) combined oxalic acid and water glass as depressants in scheelite-calcite flotation, it showed that acidified water glass interacted more intense with calcite than scheelite. Deng et al. (Deng et al., ...

dium carbonate in the froth flotation of scheelite in order to test the general hypothesis on its mechanism and to determine potential in-teractions with depressants. 2. Material and methods 2.1. Single minerals Scheelite and calcite were the feed materials for single mineral flotation (microflotation). Scheelite came from the Mittersill ...

It appears that chelating or mixed collectors and modified versions of sodium silicate and quebracho hold great promise for scheelite flotation, while the use of said depressants and/or promoters ...

Effects of carboxylic acid collector, benzohydroxamic acid (BHA), sodium hexametaphosphate (SHAP), sodium silicate, and oxalic acid on scheelite flotation were studied through flotation tests, quantum chemical calculation, and flotation solution computational chemistry. In terms of the calculation results, the relationship between chemical reactions …

Hence, it is required to add flotation collectors to make scheelite hydrophobic and recover it in the froth (Bulatovic, 2007). Two main surface properties can be exploited for the adsorption of ...

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 ...

Indeed, some authors successfully used phosphate derivatives to depress calcite and fluorite in scheelite flotation (Changgen and Yongxin, 1983; Yongxin and Changgen, 1983), …

An efficiently optimized reagent regime was investigated to improve scheelite heating flotation. The scheelite grade and recovery in the plant were significantly improved by 5% and 6%, respectively, which remarkably augmented the economic profit by $260,000 per month. The interaction mechanisms of sodium sulfide and sodium oleate with scheelite, calcite and …

Scheelite recovery could be maintained over 90 % with an increase in CSOL, and the flotation recovery difference between scheelite and calcite and fluorite reaches about 80 %. The flotation results indicate that CSOL could be used as a highly effective depressant of calcite and fluorite, and the depressing performance is better than the ...

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.

In order to improve the scheelite flotation with sodium oleate (NaOL), the effect of a non-ionic polyoxyethylene ether (JFC-5) on the floatability of scheelite was investigated through flotation ...

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 ...

Particle size plays an important role in fine scheelite flotation [11].The recovery of both coarse and fine particles in flotation are generally controlled by the bubble-particle attachment and detachment [12].As more and more finely disseminated scheelite ores are explored and processed, large amounts of fine scheelite particles (usually slimes) are …

The micro-flotation results indicated that the addition of Pb(NO 3 ) 2 or Pb-OL complex obviously improved the scheelite recovery, and eliminated the adverse effect of Ca ²⁺ ions on the ...

Recently, many environmentally friendly and non-toxic depressants have been introduced to inhibit dolomite or calcite in magnesite flotation, for example, HEDP (Yang et al., 2020b), Na 2 ATP (adenosine 5′-triphosphate disodium salt) (Yao et al., 2020a) and PBTCA (2-phosphonobutane-1,2,4-tricarboxylic acid) (Qin et al., 2021), the phosphonic acid functional …

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 ...

In particular, in the concentration section of scheelite flotation from Figure 4 (usually between 1 × 10 −4 and 3 × 10 −4 mol/L), the ratio of Pb/BHA was between 2 and 3, which may reflect the average ratio of lead ions to BHA in the molecular structure of complexes adsorbed on the scheelite surface. However, further microscopic ...

Keywords: scheelite, fluorite, calcite, regulator, flotation separation . INTRODUCTION . In scheelite flotation, gangue minerals such as Fluorite and Calcite have the same surfaceactive …

Keywords: scheelite, fluorite, calcite, regulator, flotation separation . INTRODUCTION . In scheelite flotation, gangue minerals such as Fluorite and Calcite have the same surfaceactive cation (Ca-2+ ) with scheelite minerals and strong binding capacity with the fatty acid collectors. So the flotability of scheelite is a

Studies have confirmed that carboxymethyl chitosan exhibited a good selective depressant effect on calcite in scheelite flotation (Feng et al., 2019).Xiang found (Xiang et al., 2015) that the carboxymethyl chitosan shows a wonderful effect on galena and has surface cleaning functions.Many other researches also show that carboxymethyl chitosan has the …

Bulatovic, S.M., 2007. Handbook of flotation reagents (1st Ed.), Vol.1, Elsevier Science & Technology, Amsterdam, Netherlands. ... Froth flotation of scheelite has regained …

Yongxin, Selective flotation of scheelite from calcium minerals with sodium oleate as a collector and phosphates as modifiers. I. Selective flotation of scheelite, Int J Miner Process, № 10, с. …

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. ... (Bulatovic, 2010) as ...

The formed BHA-Pb complexes, and positive lead species have contributed to the effective flotation of scheelite. These computational results are consistent with the flotation results and the XPS results. It can be concluded that lead ions play as an inhibitor for fluorite flotation, an on–off switch for scheelite flotation.

The flotation of pyrochlore using two common oxide collectors, octyl hydroxamic acid (OHA) and sodium oleate (NaOl), was studied by microflotation tests on high purity pyrochlore sample and batch flotation tests on a pyrochlore ore sample. The high purity pyrochlore sample was screened into different size fractions, −20 µm, −38 + 20 µm, −75 + 38 …

Handbook of Flotation Reagents: Chemistry, Theory and Practice is a condensed form of the fundamental knowledge of chemical reagents commonly used in flotation and is addressed to the researchers and plant metallurgists who employ these reagents. This book consists of three distinct parts: part 1 provides detailed description of the chemistry used in mineral processing …

way for scheelite flotation, which is operated at the condition of high temperature, high concentrate pulp, strongly stirring, high pH and high dosage of sodium silicate. The harsh …

Figure 2 shows the adsorption amounts of lead ions and BHA on the mineral surface under activation flotation (shown as Pb 2+ +BHA in figures) and Pb-BHA complex flotation at different pH values. The adsorption capacity was the largest in the pH range 6–10 for both lead ions and BHA. As shown in Figure 2A, there was no significant difference in the amount of lead ion …

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 functional theory (DFT). The flotation results reveal that the selective depression effect of PA-Na is better than that of sodium silicate, and …

way for scheelite flotation, which is operated at the condition of high temperature, high concentrate pulp, strongly stirring, high pH and high dosage of sodium silicate. The harsh flotation process ... (Bulatovic, 2007). The complex would sink to the underflow and rely on the advantages of large quantities of PA-Na, thereby reducing the ...

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 scheelite flotation process is based on the development of scheelite flotation reagents and has developed in several stages, such as fatty acid flotation, …

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 …

The flotation recovery of calcite dropped sharply to 4.56%, while scheelite still maintained a high flotation recovery of 71.01% at pH 7.5. A series of mechanism experiments showed that the localized ions on the surface of scheelite and calcite were mainly tungstate and calcium species, and the dominant component on the calcite surface was ...

Beyond that, the cyclohexyl hydroxamic acid (Zhao et al., 2013) and octyl hydroxamic (Meng et al., 2015) were employed in the flotation of scheelite flotation and fine wolframite flotation. Novel carboxyl hydroxamic acids (Jiang et al., 2010 ) were also be designed and used for the flotation of aluminosilicate minerals.