Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and …

flotation schemes to process high-grade, coarse-grained ores. Because of the depletion of these easy-to-process ... chemically classified as sulphur-deficient and sulphur­ ... Characterization of oxidized sulphide surfaces has been undertaken to identify the chemical nature of the oxidation products. Electrochemical techniques,

Surface Characterization of Concentrated Jamesonite, in the Collectorless Flotation, in Acid, Neutral, and Alkaline Medium Download book PDF. ... in metal, on the surface of the particles, when it has a potential lower than + 80 mV and pH of 6.86. For example, sulfur is passivated at a potential from + 80 mV to + 470 mV, ...

A novel and simple flotation technique has been developed to prepare high-purity graphite from impure graphite. In this method, a suspension of pristine powdered graphite (PG) is dispersed and ...

Exploring new ways to acquire niobium resources is essential to resolve niobium supply risks, due to the fact that, at present, 99% of niobium is controlled by only two countries. In the present work, a …

Introduction. Frash process, a solution mining method operated at an elevated temperature and pressure, has been the major process for producing elemental sulfur in the United States for many...

This study aimed to evaluate the feasibility of enhanced desulfurizing flotation of high sulfur coal via the sonoelectrochemical method. In the − 0.076 mm coal, optimal conditions include an anhydrous ethanol concentration of 2.1 mol/L, a sonoelectrolytic time of 20 min, current density at 15 × 10 −3 A/cm 2, and ultrasonic intensity at 1.2 ...

In this study, a novel collector of sulfur-containing ionic liquid (SCIL) was synthesized by the inorganic anion (isobutyl xanthic acid) and organic cation (N-tetrabutyl quaternary ammonium salt) and it was used to remove pyrrhotite from magnetite by reverse flotation at the first time. The collecting performance of SCIL was studied by ...

This study aims to synthesize nanoparticle collectors (NPCs) by emulsion polymerization to improve the abovesaid flotation desulfurization process. The …

Vo1. 2, Characterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching 7 A sodium silicate dosage of 50 g/t increases the sulfur grade of the concentrate to 89% with a recovery of 91%. The grade of both copper and siliceous material has been reduced significantly, indicating a lesser amount of chalcopyrite and siliceous ...

@article{Chen2024UltrasonicPF, title={Ultrasonic pretreatment for enhancing flotation separation of elemental sulfur and silver-bearing lead minerals from an oxidative pressure leaching residue of zinc sulfide}, author={Canneng Chen and Song Zhang and Quanjun Liu and Luzheng Chen and Yongjun Xian and Yijie Wang}, journal={Minerals …

Read this article. Effective desulfurization of high-sulfur bauxite is one of the major problems in the alumina production industry. To overcome this, a novel …

Nowadays, the common reverse flotation collector in desulfurization of high-sulfur bauxite is xanthate, but it has unstable chemical properties, weak selectivity and some neurotoxicity[6]. In addition, it will decompose under acidic conditions, so the pulp pH needs to be adjusted to alkaline during xanthate desulfurization, which will produce a ...

The flotation recovery of smithsonite in the absence and presence of vulcanizing agents at different pH values is depicred in Fig. 2a. (flotation conditions: Sodium sulfide vulcanization: Na 2 S = 1 × 10 -3 mol/L, SBX = 1 × 10 -4 mol/L; Sodium thiocyanate vulcanization: NaSCN = 1 × 10 -3 mol/L, SBX = 1 × 10 -4 mol/L).

Bauxite is one of the main raw materials in the alumina industry. Fine high-sulfur bauxite flotation desulfurization is a great challenge presently. This study aims to synthesize nanoparticle collectors (NPCs) by emulsion polymerization to improve the abovesaid flotation desulfurization process. The physicochemical properties of high …

phases in the high-sulfur residue flotation, using DFT calculation, interfacial characterization and on- line test . T he adsorption behavior results of DDT C and H 2 O obtained by DFT calculation ...

The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and tellurium removal. The sulfur in the leaching is in a form of discrete particles with a size range of 5 to 10 microns. The sulfur particles tend to agglomerate in the pulp and ...

The fundamental aspects of the flotation of sulphide minerals both in the absence and presence of thiol collectors are discussed in relation to their crystal structure, surface …

Diethyldithiocarbamate (DDTC) is employed in the sulfide ore flotation process due to its excellent collection performance. Herein, we investigated the interfacial adsorption behavior of DDTC on the four …

This study was carried out with one of the physiochemical techniques of coal sample beneficiation using froth flotation technique for upgrading the quality of Achibo-Sombo-Dabaso coal, southwestern Ethiopia. ... The proximate and ultimate characterization studies show that the raw coal samples contain 11.81-20.27% …

The flotation desulfurization process is simpler, less investment and higher utilization of resources. Therefore, flotation process is more suitable for high-sulfur bauxite desulfurization . In this study, the high-sulfur bauxite was used as raw materials and the flotation was applied to separating sulfur minerals from bauxite.

Under the closed-circuit flotation flowsheet of "one roughing-two cleaning-three scavenging", aluminum concentrate with a yield of 85.91% and sulfur content of 0.56% were obtained using a ...

Results showed that when roasting at 650 °C for 120 s, the desulfurization efficiency was up to 76.98%, while the residual sulfur in the roasted ore was found to be 0.07%. HU et al [24] roasted high-sulfur bauxite ore at 600 °C for 60 min, and the dissolution test was performed at 240 °C and roasted for 60 min.

ABSTRACT Effective desulfurization of high-sulfur bauxite is one of the major problems in the alumina production industry. To overcome this, a novel nanoparticle collector (NC) to improve the desulfurization performance during flotation process was synthesized via emulsion polymerization method, whereby lignin (natural polymer) was …

The complexity of the sulfur reduction to polysulfides indicates that a better understanding of the mechanism still needs more detailed characterization and studies. Due to the close Gibbs free energies, various polysulfide …

Collectorless flotation of pyrargyrite can be carried out over a wide range of pH and pulp potentials Eh. The optimum pH for flotation is greater than 6.0 and a 66.4% w/w of flotation is obtained with Eh of +287 mV. At pH 10 values there is a flotation efficiency of 67.4% w/w with Eh values of +100 mV.

Zhang studied the flotation performance of a collophanite ore by employing sulfur–phosphorus mixed acid as a depressant, and found that the sulfur–phosphorus mixed acid could depress the apatite effectively; a concentrate with P 2 O 5 content of 28.4% and a corresponding recovery of 85% was obtained.

The contents of copper, arsenic, and sulfur in flotation concentrate increased significantly, and their enrichment ratios relative to raw CSS were 14.43, 6.69, and 11.20, respectively. The enrichment ratio can reflect the recoverability of target elements [29]. A low arsenic enrichment ratio reflects the difficulty in recovering arsenic …

The main objective of this research is to upgrade the heating value of coal from the Achibo-Sombo-Dabaso area by minimizing the ash and sulfur content using froth flotation techniques, applying diesel oil as a collector and n-octanol as frother reagents. The selection of this reagent is based on the viscosity, low cost and high molecular …

Characterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching Residue. Elemental sulfur produced by chloride leaching of sulfide ores or …

Then beneficiation of coal by flotation technique was used to minimize the amounts of sulfur content in the coal sample which leads to increased calorific values and qualities of the coal. Generally, the sulfur contents in a study are confirming the limit standard for coal quality which contain less than 1% used in the metallurgical and power ...

Mineral processing played only a small role in the elemental sulfur industry. When a sulfur ore was selected, a typical method was grinding the sulfur ore to about 28 mesh followed by froth flotation.

Mineralogical characterization of the Amaruq tailings using automated scanning microscopy (QEMSCAN®) revealed that the total sulfide and carbonate contents were about 8 wt% and 3 wt%, respectively; 63.39 % of the sulfur occurred as pyrrhotite, 30.17 % as pyrite, 3.63 % as gersdorffite, and 2.61 % as arsenopyrite.