The results of desulfurization roasting of the lead–zinc tailings in the rotary furnace showed that the desulfurization rate was 99.0% and the concentration of SO 2 was 5.58–5.07% when the roasting temperature was 400 °C, the filling rate was 4.29%, the air–solid ratio was 1.7 L/g and the residence time was 20 min.Web
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Environmental desulfurization by froth flotation is one of the strategies recommended by researchers as an integrated tailings management technique. It has been demonstrated to be economically and technically effective to prevent CMD …Web
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1. Introduction. Froth flotation is the largest tonnage separation in mineral processing by which valuable mineral is separated from waste rock. Advances in control and optimisation of the froth flotation process are of great relevance since even very small increases in recovery lead to large economic benefits (Ferreira and Loveday, 2000, …Web
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In mineral flotation, rheological problems have limited the efficient upgrading of low-grade and complex ores. Since pulp and froth rheology are deemed to play different roles in influencing the separation performance, in this paper, a brief review on pulp and froth rheology in flotation is provided, with an objective of developing a basic …Web
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Two methods were examined for desulfurization process using reverse floatation: 1) grinding the produced concentrate by low intensity magnetic separators (Final …Web
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Demineralization and desulfurization methods2.1. Column froth flotation methodLignite, before utilization, is subjected to some physical, chemical and biological desulfurization methods. In mineral processing, a flotation method is used to separate and concentrate ores by altering their surfaces to a hydrophobic or hydrophilic condition, i.e ...Web
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Methods for subsequent physical separation include hydraulic washing, gravity separation, magnetic separation and froth floatation. Levigation is commonly used for oxidic ores, froth flotation for sulfidic ores and magnetic separation for magnetic ores or impurities. ... In wet flue-gas desulfurization, gas streams containing SO x react with ...Web
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Column froth flotation: Lignite and bituminous: Turkey: Column floatation showed better performance in sulfur removal as compared to conventional flotation. Demirbaş (2002) Flotation: Fine coal: Turkey: Pyritic sulfur and sulfate sulfur was removed to a level of 90.04% and 81.45%, respectively, under predefined conditions. Sahinoglu …Web
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Keywords: Desulfurization, Ash removal, fixed carbon, GCV, Coal, Froth flotation. 1.Introduction The present study has been carried out on the coals of Akkakhel in Bara, District Khyber, Akhorwal, District Kohat and Shekhan in Lower Orakzai District located in the western parts of Khyber Pakhtunkhwa, Pakistan (Fig. 1).Web
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Int. J. Miner. Process. 60 Ž2000. 57–74 Environmental desulphurization of four Canadian mine tailings using froth flotation M. Benzaazoua a,), B. Bussiere ` a,1, M. Kongolo b,2, J. McLaughlin c,3, P. Marion b,4 a UniÕersite´ du Quebec ´ en Abitibi Temiscamingue, ´ Unite´ de Recherche et de SerÕice en Technologie …Web
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Evaluation of column flotation froth behavior by image analysis: effects of operational factors in desulfurization of iron ore concentrate. Flotation performance is …Web
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The froth floatation process can be impacted by the properties of oily sludge, treatment time, temperature, pH, salinity, air bubble size, and presence of surfactant. ... Denitrogenation and desulfurization processes should be integrated from a practical perspective. An efficient biodenitrogenation and biodesulfurization process requires the ...Web
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The froth formed by the bubbles runs off to the top of the flotation cell and breaks. The floated mineral particles can be recovered by filtration. Since the life of an air bubble in water is about 0.01 s, air bubbles burst and drop the mineral particles before reaching the surface of pure water. This makes it essential to stabilize the froths ...Web
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Entrainment is a process by which fine and ultrafine particles are transferred to the flotation froth from the top of the flotation pulp, and eventually discharge to the concentrate product, even when they are not attached to gas bubbles. Therefore, entrainment can be considered as a two-step process, one at the upper layer of the pulp …Web
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In addition, primary desulfurization methods are chemical desulfurization, leaching, extraction, flotation, oxydesulfurization and biodesulfurization [18], [19], [20]. ... The effects of leaching and floatation on the ash fusion temperatures of three selected lignites. ... Demineralization and desulfurization of coals via column froth flotation ...Web
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Chemical effects produced by ultrasonic cavitation are also proved to be beneficial in desulfurization of high‑sulfur coal. Besides, the effect of ultrasonic cavitation on bubbles or froth layer can't be overlooked. Therefore, it is necessary to comprehensively summarize the application of ultrasound in all aspects of fine coal flotation.Web
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Project work involved demineralization and desulfurization of high sulfur-containing Northeast coal using a combination of physical and chemical treatment. Physical beneficiation included froth floatation, followed by chemical leaching with reagents such as oxalic acid, hydrochloric acid, and hydrogen peroxide. Proximate and ultimate analysis ...Web
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Furthermore, froth stability [19], frother chemistry [20], ... The overall effect of collector dosage on floatation performance will be established below. The effects of the pulp density, frother dosage and dispersant are negligible compare to the effect of the collector alone. ... Desulfurization of the old tailings at the Au-Ag-Cu tiouit mine ...Web
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Environmental desulfurization and cemented paste backfill (CPB) are amongst the most studied methods. The former increases the net neutralization potential of the tailings (Benzaazoua et al., 1999, 2004, 2008; Nuorivaara et al., 2019; Nakhaei and Irannajad, 2017; Amar et al., 2021), whereas the latter reduces the amount of sulfidic …Web
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Surface chemistry investigation of froth flotation products of lead-zinc sulfide ore using ToF-SIMS and multivariate analysis. Author links open overlay panel Hao Lai a, Jiushuai ... effects; and the influence of the design strategy applied. Additionally, the design of a Cu–Ni plant that includes desulfurization is employed to deepen the ...Web
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The chemical effect caused by ultrasound can be usually utilized to improve desulfurization performance in coal flotation. However, prolonged ultrasonic treatment re-oxidizes the coal surface, resulting in a decrease in floatability of coal fines and an increase of desulfurization rate. ... Froth flotation is the most effective way for recovery ...Web
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Environmental desulfurization by froth flotation is one of the strategies recommended by researchers as an integrated tailings management technique. It …Web
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The physical desulfurization method has the advantages of simple process, low investment, and low operating costs. To improve the desulfurization efficiency, desulfurization methods by combining multiple processes, which are selected according to the characteristics of different coal types, were also proposed and studied [16]. 3.2.Web
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The desulfurization of high-sulfur bauxite via flotation is more difficult than conventional sulphide, since the finely disseminated sulphide in the high-sulfur bauxite can lead to excessive particle entrainment, increase of froth, and low separation efficiency. Acidification of high-sulfur bauxite resulting in changes in mineral surface ...Web
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Froth flotation (FF) pretreatment of coal from Hazro, Turkey, for enhancing desulfurization with sodium hydroxide was investigated. FF reduced following contents of coal: ash, 58.54; pyritic ...Web
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The desulfurization rate is calculated according to the following formula (1): (1) Desulfurization rate = 100 Sy - γ j × S j / 100 S y × 100 % where S y is the sulfur content of raw coal; S j is sulfur content of cleaned coal; γ j is the yield of cleaned coal. The flotation process and conditions are shown in Fig. 2.Web
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To produce desulphurized tailings, non-selective froth flotation is the most adapted method. The desulphurization level is fixed …Web
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Parametric Study on Desulfurization and De-ashing of Lakhra Pakistan Coal by Froth Floatation Column Method. Ikram Ullah 1, 3, Asif Hayat 2, Faisal Mushtaq 3, ... velocity of air and feed composition have significant influence on the desulfurization, de-ashing and efficiency of pyritic sulfur. The sulfur and ash components were reduced by 66% ...Web
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Desulfurization Froth flotation Pyritic sulfur 1. Introduction Lignite is the most important source of energy in Turkey, and the average sulfur content of Turkish …Web
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3.4 Froth flotation. Froth flotation is a selective separation process to separate valuable materials (recyclables, minerals, and other fine-size waste) from unwanted materials (gangue) using air bubbles in a general floatation tank, Jameson flotation cell, or …Web
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@article{osti_6559305, title = {Froth flotation desulfurization of high-sulfur coal}, author = {Sinha, A K}, abstractNote = {Froth flotation cells have been successfully utilized for a long time in many mineral processing plants and in coal preparation plants for recovering fine coal, but none have been utilized for desulfurizing thermal coal.Web
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Froth flotation is now the most commonly used method for cleaning fine-coal fractions in coal-preparation plants. Past research and industrial practice have demonstrated that froth flotation achieves excellent separation efficiencies for fine coals having only a small fraction of middling particles. However, the efficiency of froth flotation decreases …Web
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Recent developments in beneficiation of fine and ultra-fine coal -review paper. M. Ramudzwagi, ... W. Nheta, in Journal of Cleaner Production, 2020 3.3 Flotation. Coal flotation is the most proficient technique used to improve the nature of fine particles by diminishing pollution substance (Majumder and Barnwal, 2011).The hypothesis of froth …Web
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In the attempt to process lower-grade ores, mineral flotation has taken centre stage as the preferred recovery route. However, in many instances, the froth product does not have a high grade due to the entrainment of gangue minerals. Industry has solved this challenge by introducing froth washing mechanisms. Clean wash water is introduced …Web
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This study presents an experimental program performed to investigate the effects of flotation variables including gas flow rate, froth depth, slurry solids percent, frother/collector dosage, and pH on the froth features such as bubble size, froth velocity, froth color and froth stability during desulfurization of an iron ore.Web
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Semantic Scholar extracted view of "Environmental desulfurization of mine tailings using froth flotation: The case of Amaruq Mine (Nunavut, Canada)" by Abdelilah El-bouazzaoui et al.Web
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