Enhanced lignite flotation using interfacial nanobubbles based on temperature difference method

Zhang, Fanfan; Xing, Yaowen; Chang, Guohui; Yang, Zili; Cao, Yijun; Gui, Xiahui

doi:10.1016/j.fuel.2021.120313

Cited by 17 publications

(10 citation statements)

References 33 publications

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“…It was found that surface nanobubbles were present on highly oriented pyrolytic graphite surface; coal agglomeration occurred in the presence of nanobubbles, indicated by the shear thinning of coal slurry [64,73]. Elsewhere, a new method was developed that introduces interfacial nanobubbles (based on the temperature difference method) for enhancing lignite flotation, which is more hydrophilic than other types of coal; hence, the separation and upgrading of its fine particles by froth flotation being quite ineffective [74].…”

Section: Nanobubblesmentioning

confidence: 99%

From Microbubbles to Nanobubbles: Effect on Flotation

2021

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Attachment of particles and droplets to bubbles—the latter being of various fine sizes and created by different techniques (as described in detail)—forms the basis of flotation, a process which indeed was originated from mineral processing. Nevertheless, chemistry often plays a significant role in this area, in order for separation to be effective, as stressed. This (brief) review particularly discusses wastewater treatment applications and the effect of bubble size (from nano- to micro-) on the flotation process.

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Section: Nanobubblesmentioning

confidence: 99%

From Microbubbles to Nanobubbles: Effect on Flotation

2021

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“…When the temperature was 25 °C, the amount of collector was reduced from 2 kg/t to 1.5 kg/t under the condition of obtaining the same recovery. 96 Currently, hydrodynamic cavitation is the most widely used method. The size and number of nanobubbles can be controlled by adjusting the structural parameters of the venturi.…”

Section: Promotion Of Ultrafine Particle Bubble Mineralization Bymentioning

confidence: 99%

“…During bubble mineralization, nanobubbles can disrupt the liquid film between bubbles and particles and enhance the liquid layer drainage by inducing boundary slip at the solid–liquid interface. After the contact between bubbles and coal particles, the nanobubbles on the contact line expand the three-phase contact perimeter between bubbles and particles, increasing the contact angle and contact radius of bubbles, thus improving the system’s stability. − In addition, due to its characteristic of attaching only to hydrophobic surfaces, the nanobubbles only enhance the bubble mineralization and transport of hydrophobic particles while not affecting hydrophilic particles, thus reducing ash in the concentrate.…”

Section: The Auxiliary Optimization Conditions For Low-rank/oxidized ...mentioning

confidence: 99%

“…The temperature difference method could effectively reduce the amount of collector used. When the temperature was 25 °C, the amount of collector was reduced from 2 kg/t to 1.5 kg/t under the condition of obtaining the same recovery . Currently, hydrodynamic cavitation is the most widely used method.…”

Section: The Auxiliary Optimization Conditions For Low-rank/oxidized ...mentioning

confidence: 99%

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Advances and Perspectives of Green and Sustainable Flotation of Low-Rank/Oxidized Coal: A Review

Gao,

Li,

Lyu

et al. 2024

Energy Fuels

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Flotation is a mature technology for the commercial processing of fine coals. However, due to the difficult flotation characteristics of low-rank/oxidized coals, conventional flotation is often inefficient, resulting in massive low-rank/oxidized coal resources not being utilized efficiently and thus going to waste. In addition, the large quantities of conventional oil collectors used to meet satisfactory flotation objectives adversely affect the environment. Under the current huge energy demand and environmental pressures, the efficient, green, and sustainable upgrading of low-rank/oxidized coals is an urgent need for the coal industry. In recent years, a number of attractive techniques to improve separation accuracy have been proposed. However, few ideas have been reported about the application of different types of technologies throughout the flotation process which can improve the flotation process objectives and thus reduce the formation of contaminants. In order to explore an ideal flotation technology for low-rank/oxidized coals, this paper provides a systematic review of the research progress in low-rank/oxidized coal flotation, including the updates in three aspects: the development of pretreatment processes, selection and combination of flotation reagents, as well as optimization of flotation conditions. The synergy of multiple technologies, that maximize flotation objectives and thus reduce the dosage of non-renewable collectors, is the key to achieving green separation of low-rank/oxidized coals. According to the advantages of existing technologies, a green and sustainable flotation process for low-rank/oxidized coal combining pretreatment process, green flotation reagents, and flotation optimization process is proposed to obtain positive process objectives while maximizing economic savings and environmental friendliness.

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“…Coal is a solid fuel that has been used as a primary fossil fuel for centuries. The world's known coal reserves are much greater than those of gas and oil which means that it will be dominant in energy supply in the subsequent years [1][2][3]. Depending on the time of formation, coal can be classified as anthracite, bituminous coal, and lignite [4].…”

Section: Introductionmentioning

confidence: 99%

Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

et al. 2021

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The presented study is a continuation of the research with the aim of finding a useful value of hazardous waste slag generated by the combustion of lignite in heating plants and its application in the construction industry. The different amounts of cement (10, 15, 20 and 25%) were replaced with waste slag and silica fumes in mortars and concrete production. Detailed physical–mechanical characterization was performed on the mortar and concrete samples according to standard procedures. Test results indicated that the replacement of cement with slag and silica fumes reduces the physical and mechanical properties of mortar and concrete, but cement composites retained the required structural properties. If 15–20% is considered an acceptable level of compressive strength decrease, then it can be concluded that waste slag can be implemented in practice and be used as a construction material, with cement replacement in the maximal amount of 20% (17.8% of slag and 2.2% of silica fumes). On hardened mortar samples with maximal possible cement replacement (20%), physical–chemical characterizations were performed and included X-ray and infrared spectrophotometry, scanning electron microscopy, and thermal analysis. Results showed the absence of new phases and the presence of only those which were characteristic for starting samples, predominantly portlandite, quartz, calcite and calcium silicate-oxide.

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Enhanced lignite flotation using interfacial nanobubbles based on temperature difference method

Cited by 17 publications

References 33 publications

From Microbubbles to Nanobubbles: Effect on Flotation

From Microbubbles to Nanobubbles: Effect on Flotation

Advances and Perspectives of Green and Sustainable Flotation of Low-Rank/Oxidized Coal: A Review

Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

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