Significant Improvement in the Scheelite Heating Flotation with Sodium Sulfide

Kang, Jianhua; Liu, Yuanchao; Khoso, Sultan Ahmed; Hu, Yuehua; Sun, Wei

doi:10.3390/min8120587

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…The introduction of 4.9 kg / t into the steaming pulp of water glass (experiments 4) ensured the production of a conditioned WO 3 concentrate, recovery being 81%. Experiment 7 reproduces the scheme is given in [3], but the results obtained on the rough concentrate at PCF β WO3 -41.83% and ε WO3 -73.33% are lower than the standard mode by the Petrov method (experiment 4).…”

Section: Resultssupporting

confidence: 53%

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Technological studies of the use of modifiers in the flotation of calcium-containing minerals

2020

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Using samples of skarn scheelite-sulfide ore from the Vostok-2 deposit, studies were carried out to model combinations of increased dose of inorganic modifiers (sodium carbonate, water glass, sodium sulfide) based on publications by foreign researchers on the achieved positive result in increasing the contrast of the mineral surfaces of scheelite and calcite and their floatability. Testing was carried out according to the standard flowsheet on tap and recycled water. Oxyhydryl collector was sodium oleate of technical acid B-115, dose 250 + 50 g/t. The order of feeding modifiers (sequential supply and combination of a mixture of sodium carbonate (bicarbonate) + water glass), the effect of the temperature of the pulp upon contact, the dose of modifiers and the ratio of components in the mixture were studied. The dose of water glass varied from 350 to 1450 g/t, sodium carbonate (bicarbonate) varied from 0 to 11.5 kg/t, sodium sulfide up to 4.9 kg / t. With increased dose of inorganic modifiers, it was not possible to achieve selective depression of calcite and apatite while maintaining effective scheelite flotation. The use of sodium bicarbonate in comparison with sodium carbonate, at the same flow rates, creates a less alkaline pH in the flotation pulp, which leads to an increase in the concentration of hardness ions [Са2+, Mg2+] and overdose of the collector. Using combinations of reagents: sodium carbonate (bicarbonate) + water glass, sodium sulfide + sodium hydroxide + water glass, even with a slight increase in the dose of water glass in the mixture, after heat treatment, concentrates of lower quality were obtained, with increased losses of scheelite compared to the factory mode according to the Petrov method.

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Section: Resultssupporting

confidence: 53%

“…Et al. [3], when upgrading a rough concentrate containing scheelite, wolframite, calcite, fluorite, presented an industrially developed alternative solution to the Petrov method. In the reagent mode of the rough cycle, the dose of the fatty acid collector was 1.5 kg/t; NaOH 2 kg/t, in the selection Na 2 SiO 3 95 -90 kg/t, Na 2 S 5 -8 kg/t.…”

Section: Introductionmentioning

confidence: 99%

Technological studies of the use of modifiers in the flotation of calcium-containing minerals

2020

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“…It should be noted that the effect of temperature on flotation has always been reciprocal rather than independent. To enhance flotation efficiency at lower temperatures, strategies typically involve augmenting the dosage of the collector or adopting high-temperature processes [9], but these cause an increase in production costs. Numerous studies have substantiated that the addition of cationic or non-ionic surfactants, such as amines [10], ether amines [11], amides [12], alkenes [13], and Gemini surfactants [14], can improve the collecting performance of anionic surfactants, and particularly fatty acids, at lower temperatures, thereby augmenting the flotation recovery of minerals.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature on Spodumene Flotation and Gas–Liquid Interface of Sodium Oleate Solutions

Sun,

Wang,

Zhang

et al. 2024

Minerals

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This study investigates the negative impact of temperature on spodumene flotation from the perspective of the gas–liquid interface of sodium oleate (NaOL) solutions. Micro-flotation tests revealed a significant decrease in the flotation recovery of spodumene when NaOL was employed as a collector, dropping from 55.3% at 305.4 K to 5.1% at 277.3 K as the temperature decreased. A strong linear correlation between the surface tension of the NaOL solution and temperature was established. As the temperature decreased, the surface tension of 6 × 10−5 mol/L NaOL increased from 37.88 mN/m at 294.9 K to 40.71 mN/m at 281.9 K, while its critical micelle concentration decreased from 9.49 × 10−4 mol/L at 305.0 K to 6.85 × 10−4 mol/L at 288.0 K. Additionally, molecular dynamics (MD) simulations indicated that a decrease in temperature resulted in an enhancement of intermolecular action forces, a more compacted interfacial structure, and weakened molecular thermal motion at the gas–liquid interface of the NaOL solution. These variations were found to be the main reason for the rise in the surface tension of the NaOL solution as the temperature decreased, which in turn lowered its efficiency, resulting in a decrease in the flotation efficiency of spodumene.

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“…Wolframite was overexploited in the last century and gradually exhausted. Highly efficient mining and processing of scheelite have been the focus of research over the last decades [4,5]. Scheelite is a calcium-bearing mineral and is generally associated with calcite, wollastonite, and fluorite.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Sodium Hexametaphosphate for Separating Scheelite from Calcite and Fluorite Using an Anionic–Nonionic Collector

Kang

Sun

et al. 2019

Minerals

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This study presents a highly selective reagent system that utilizes sodium hexametaphosphate (SHMP) to improve the separation of scheelite from calcite and fluorite using an anionic–nonionic collector. The recoveries of calcite and fluorite decreased to 20% as the SHMP dose exceeded 6 × 10−6 mol/L, whereas that of scheelite remained at 85%. The interaction mechanisms of minerals with SHMP were investigated through equilibrium speciation, Zeta potential, Fourier transform infrared spectrometry, and X-ray photoelectron spectroscopy analyses. SHMP exists as hydrogen phosphate anion in the aqueous solution with a pH of 7–12. Moreover, it may be adsorbed intensively on the positively charged surfaces of calcite and fluorite via electrostatic force or chelation with calcium ion to impede further adsorption of the assembled collector. By comparison, the adsorption of SHMP is feeble on the scheelite surface because of its negative charge. The roughing grade of low-grade scheelite ore is substantially improved from 0.74% to 1.65% compared with that in the contrast test in the absence of SHMP.

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Significant Improvement in the Scheelite Heating Flotation with Sodium Sulfide

Cited by 8 publications

References 28 publications

Technological studies of the use of modifiers in the flotation of calcium-containing minerals

Technological studies of the use of modifiers in the flotation of calcium-containing minerals

Effects of Temperature on Spodumene Flotation and Gas–Liquid Interface of Sodium Oleate Solutions

Utilization of Sodium Hexametaphosphate for Separating Scheelite from Calcite and Fluorite Using an Anionic–Nonionic Collector

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