Differences in dry and wet grinding with a high solid concentration of coking coal using a laboratory conical ball mill: Breakage rate, morphological characterization, and induction time

Bu, Xiangning; Chen, Yuran; Ma, Guoqiang; Sun, Yujin; Ni, Chao; Xie, Guangyuan

doi:10.1016/j.apt.2019.08.016

Cited by 48 publications

(17 citation statements)

References 49 publications

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“…The induction time was a valid parameter to evaluate the time required to form an attachment between a particle and a bubble Yordan, 1991；Verrelli andAlbijanic, 2015). The measurement procedure has been described in the literature (Bu et al, 2019). In a given test, a certain amount of 1g coal sample was premixed with a volume of 30 mm saline solution of a known amount of salt ion.…”

Section: Induction Time Measurementmentioning

confidence: 99%

“…The physics of the system is the determining factor for the contact time, while the hydrophobic features of the particle surface is the physicochemically dominated factor for the induction time. The measurement results of the induction time are widely used to compare the bubble-particle interaction (Bu et al, 2019;Ye and Miller, 1988;Yoon and Yordan, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Effects of monovalent and divalent ions in coal gasification brine on the froth entrainment and flotation kinetics of anthracite coal

Zheng¹,

Bu²,

Zhou³

et al. 2020

Physicochem. Probl. Miner. Process.

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Water plays a critical role in various stages of flotation, which brings a lot of pressure to the flotation processing plants resided in dry areas. In this regard, it will be of significance to explore the feasibility of using wastewater resources in mineral flotation. Coal gasification brine (CGB) that contains a high concentration of salts becomes the subject of interest of this study. In this study, a synthetic CGB solution, which was prepared by adding NaCl, MgCl2, and CaCl2 to ultrapure water based on the composition of salts in a real CGB, was used in the flotation of anthracite coal. The comparison results based on the first-order model showed that flotation in the presence of the synthetic CGB solution gave a higher flotation selectivity (SI =7.086) than that of flotation in ultrapure water (SI=3.545). Water recoveries and average bubble sizes in the froth showed that the addition of the three salt ions (Na + , Mg 2+ , and Ca2 +) was conducive to diminishing the entrainment of gangue materials as a result of the reduction of water reporting to the froth. Additionally, the zeta potentials and induction time measurements indicated that only divalent ions of Ca 2+ and Mg 2+ significantly compressed the double electrical layer and enhanced the attachment between bubbles and coal particles according to DLVO theory, which was further confirmed by the calculation of interaction energy between coal and bubbles. The findings of the present work may promote the use of CGB as a potential water resource in coal flotation.

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Section: Induction Time Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of monovalent and divalent ions in coal gasification brine on the froth entrainment and flotation kinetics of anthracite coal

Zheng¹,

Bu²,

Zhou³

et al. 2020

Physicochem. Probl. Miner. Process.

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“…In total, 73% of Chinese coal contains fluorine ranging from 50 to 300 mg/kg, averaging 202 mg/kg [11]. Power plants use nearly 1.76 billion tons of coal produced in China to generate electricity [12,13]. Considering the average fluorine concentration of coal at a low value of 100 µg/g, the fluorine emission from 1 t steam coal combustion into the atmosphere amounts to 8.3 × 10 −5 t [14].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Removal Potential of Fluorine in Lignite from a Mine in Shaanxi Province, China: A Case Study

Zhou

et al. 2022

Minerals

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Fluorine appears in coal and is released into the atmosphere upon combustion, resulting in harmful impacts on the environment and life, which needs to be removed from coal before utilization. Coal can be processed by flotation and gravity separation to reduce its fluorine content. In this study, a lignite sample from a mine in Shaanxi Province, China, was characterized using the float–sink test, sieving test, X-ray diffraction (XRD), and polarized light microscopy. Mineralogical analysis indicated that the fluorine in coal is mainly contained in Muscovite and polylithionite, and partly in pyrite. The washability and floatability analyses were employed to evaluate the extent of fluorine removal from >0.5 and <0.5 mm size fractions of lignite, respectively. Compared to the raw sample that contained 347.74 μg/g fluorine content, the proposed combination of gravity-flotation separation process decreased the fluorine content to 90.14 μg/g, which meets the requisites of coal standards.

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“…Peukert [7] studied the effect of the mechanical properties of the grinding media and ground material on the comminution process. Bu et al [8] studied the effect of wet versus dry grinding on particle morphology features and their effect on the flotation process. Moosakazemia et al [9] investigated the effect of ball mill liner and operating conditions, such as quartz feed size and its morphology features.…”

Section: Introductionmentioning

confidence: 99%

Morphology Study of Particle Breakage Mechanisms in a Horizontal Stirred Mill: Automated and Manual Point Counting Approaches

Roufail¹,

Klein²

2021

JMMCE

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High-speed stirred mills are utilized to grind particles below 10mm. Grinding sulphide minerals to as low as 10mm achieve adequate mineral liberation for successful downstream mineral processing operations, such as flotation and leaching. Particle breakage mechanism such as fracture or abrasion, determines the morphological surface features of the product particles. It is anticipated that particles, which break along grain boundaries (intergranular) produce rough surfaces, whereas particles that break across the grain boundaries (transgranular) possess smoother surfaces. In this study, particles are ground in a stirred mill and their morphological features were analyzed using automated and manual detection methods. Literature and conventional belief are that high-speed stirred mills break particles by attrition. This paper showed that fracture is also an important breakage mechanism along with attrition. Breakage mechanism is a factor of input stress intensity, in the form of the mill agitator speed, and type of mineral. It is observed that at higher agitator speed galena fractures along the grain boundaries, whereas quartz, abrade across the grain boundaries.

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Differences in dry and wet grinding with a high solid concentration of coking coal using a laboratory conical ball mill: Breakage rate, morphological characterization, and induction time

Cited by 48 publications

References 49 publications

Effects of monovalent and divalent ions in coal gasification brine on the froth entrainment and flotation kinetics of anthracite coal

Effects of monovalent and divalent ions in coal gasification brine on the froth entrainment and flotation kinetics of anthracite coal

Characterization and Removal Potential of Fluorine in Lignite from a Mine in Shaanxi Province, China: A Case Study

Morphology Study of Particle Breakage Mechanisms in a Horizontal Stirred Mill: Automated and Manual Point Counting Approaches

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