Physical properties and filter cake structure of fine clean coal from flotation

Zhang, Yingjie; Gong, Guanqun; Wu, Guoguang; Wang, Yuelun

doi:10.1016/j.ijmst.2014.01.022

Cited by 9 publications

(2 citation statements)

References 20 publications

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“…Average specific resistance is a parameter of fundamental importance to quantitatively compare the filterability of different types of slurry samples, which has a sound theoretical basis [43,44]. Table 3 shows that the average specific resistance of raw coal was 1.98 × 10 7 m/kg, indicating a good filterability of the coal sample.…”

Section: Average Specific Resistancementioning

confidence: 99%

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Fan

Dong

et al. 2018

Minerals

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The cleaning process of coals is challenging due to the existence of clay minerals. The overall objective of this study is to investigate how the dewatering of coal slurry is impacted by the presence of clay minerals, i.e., kaolinite and montmorillonite. Filtration tests were first conducted to investigate the effect of kaolinite and montmorillonite on the dewatering efficiency of coal. Specifically, we measured the filtration velocity, moisture, average specific resistance, and porosity of filter cakes for six slurry samples, in which different amounts of kaolinite and montmorillonite were contained. Filtration tests show that a small amount of kaolinite and montmorillonite leads to a significant reduction in the filtration velocity and porosity, and a big increase in the average specific resistance and the moisture of the filter cake. We observe that most kaolinite existed in the top and middle layers of the filter cake, while most montmorillonite existed in the top layer; on the contrary, little montmorillonite is observed in the middle and bottom layers of the filter cake. Montmorillonite results in a much more deteriorative effect than kaolinite. Considering that the interactions between clay minerals and water may play a key role, we then further investigate the effect of such interactions using molecular simulations. Simulation results show that water molecules could hardly diffuse into kaolinite from the edge, while they could readily penetrate into the montmorillonite layers from the edge surface. This result can be explained by the hydrated cation in montmorillonite. The adsorption density of water on the octahedral surface of kaolinite is higher than that of water on the tetrahedral surface of kaolinite. Furthermore, the adsorption density of water on the double surfaces of kaolinite is higher than that of water on the montmorillonite surface. This research is expected to provide benefits or contributions to the dewatering of clay-rich coal tailings.

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Section: Average Specific Resistancementioning

confidence: 99%

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Fan

Dong

et al. 2018

Minerals

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show abstract

“…It was also found that the rate of dewatering and moisture content of the filter cakes were directly related to the particle size [10,11]. In the studies of Zhang [12], wet mass to dry mass, specific resistance of average mass, compressibility factor and microstructure of filter cake accounted for the reasons and mechanisms of fine clean coal efficient dewatering. Yang [13] studied the dewatering effects of a hyperbaric filter for different graded material, and reduced the cake moisture through modified filter support system or added nonionic flocculant.…”

mentioning

confidence: 99%

Dewatering effect of fine coal slurry and filter cake structure based on particle characteristics

Fan

Dong

2015

Vacuum

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Organic contaminant removal with no adsorbent recycling based on microstructure modification in coal slime filtration

Mei

et al. 2021

Fuel

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Physical properties and filter cake structure of fine clean coal from flotation

Cited by 9 publications

References 20 publications

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Dewatering effect of fine coal slurry and filter cake structure based on particle characteristics

Organic contaminant removal with no adsorbent recycling based on microstructure modification in coal slime filtration

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