The effect of different flotation operating parameters on the froth properties and their relation to clean coal ash content

2018 ◽  
Vol 53 (9) ◽  
pp. 1434-1444 ◽  
Author(s):  
Jiakun Tan ◽  
Long Liang ◽  
Wencheng Xia ◽  
Guangyuan Xie
Keyword(s):  
Coal Ash ◽  
Ash Content ◽  
Operating Parameters ◽  
Clean Coal

scholarly journals Studies on washability characteristics of low-volatile Indian coking coal by differential crushing

2020 ◽  
Author(s):  
Sugali Sekhar Chandra
Keyword(s):  
Specific Gravity ◽  
Coal Ash ◽  
Ash Content ◽  
Similar Degree ◽  
Clean Coal ◽  
Coking Coal ◽  
Relative Ease ◽  
Indian Origin ◽  
Two Parameters ◽  
Material Index

Abstract The effect of differential crushing on liberation characteristics has been studied for a low volatile coking coal of Indian origin through washability studies. Two parameters, namely “Index of Washability” (IW) and “Near Gravity Material Index” (NGMI), are used to describe the ease of washability. The ROM Coal is crushed to four different top sizes namely, 75 mm, 25 mm, 13 mm and 6 mm.On the basis of calculated IW it is observed that relative ease of washabiltiy increases with decrease in top size. From calculated IW values it may be said that this coal can be economically beneficiated using gravity process after crushing to -6 mm size. From the calculated NGMI values, the critical specific gravities have been estimated and the values for crushing to -75 mm,-25 mm,-13 mm and − 6 mm are 1.65, 1.68, 1.53 and 1.58 respectively. These critical specific gravity values suggest the separation at this specific gravity range is most difficult task using gravity methods. From NGMI analysis, it may be said that the NGMI values for coals crushed to -25 mm & -6 mm are identical (≈ 0.18) at 17% clean coal ash content. This suggests that with similar degree of difficulty, clean coal of 17% ash can be produced from these two different crushing sizes. In order to increase the yield for the clean coal of 17% ash, the decision on blending these two size coals may need to be taken.

On-line prediction of clean coal ash content based on image analysis

Measurement ◽  
2020 ◽  
pp. 108663
Author(s):  
Zhaoyu Qiu ◽  
Dongyang Dou ◽  
Deyang Zhou ◽  
Jianguo Yang
Keyword(s):  
Image Analysis ◽  
Coal Ash ◽  
Ash Content ◽  
Clean Coal ◽  
On Line

Study on Coal Separability for Wangcun Inclined Shaft in Chenghe

2013 ◽  
Vol 734-737 ◽  
pp. 1082-1085
Author(s):  
Xi Yuan Yang ◽  
Mei Li Du ◽  
Jin Ren Zhang ◽  
Jian Li Yang
Keyword(s):  
Particle Size ◽  
Coal Ash ◽  
Quality Characteristics ◽  
Ash Content ◽  
Test Results ◽  
Coal Seams ◽  
Clean Coal ◽  
Coal Quality ◽  
Heating Value ◽  
The Given

On the basis of the coal quality characteristics, the screening and drifting tests have been carried out to investigate the separability of the coals in the inclined shaft coal samples of Chenghe Wangcun coal mine. The results showed that the mine raw coal seams are medium ash, high sulfur and medium volatile coals. The screening test results showed that the water content and sulfur content of coals samples in each grade after sieving essentially remained the row coal characteristic. Heating value increased with the decrease of particle size, but ash content decreased with the particle size. The float-and-sink tests showed that when the given clean coal ash content was 10%13% and 15% respectively, the coal samples were in the extremely difficult degree, medium separability degree and medium separability degree respectively.

scholarly journals New Approach Study on Dry Coal Cleaning System with Two-Stage Corona Electrostatic Processes for High-Sulfur Low-Grade Fine Coals

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1915
Author(s):  
Chengyuan Liu ◽  
Qingyue Wang
Keyword(s):  
Sulfur Content ◽  
Coal Ash ◽  
Ash Content ◽  
Inorganic Materials ◽  
Low Grade ◽  
Electrostatic Separation ◽  
Clean Coal ◽  
Two Stage ◽  
Second Stage ◽  
Coal Cleaning

Corona electrostatic separation can remove inorganic materials from coal, reduce coal ash content and sulfur content and improve coal quality, reduce air pollution caused by smoke dust, SOX, and COX. The performance of corona electrostatic separation technology in cleaning a middle ash medium-ash, high-sulfur coal was experimentally investigated. The electrode voltage, drum rotational speed, and feeding speed were tested, whereas other parameters were maintained constant during the experiment. The results indicate that the performance of this technology in cleaning medium-ash, high-sulfur coal can be improved by optimizing the process parameters. The results demonstrate that corona electrostatic separation is effective for the beneficiation of this grade coal. In addition, the efficiency of coal cleaning is significantly improved by adding the second stage beneficiation to clean the middlings out from the first stage beneficiation. In this study, the first stage of beneficiation recovered 38.00% (by weight) of clean coal (ash content below 20%), and the second stage recovered 48.58% (by weight) of clean coal, improving the overall separation efficiency from 0.69 to 1.74. Furthermore, the sulfur content was reduced from 4.71% (raw coal) to 3.53% (clean coal). Our result show that corona electrostatic separation can effectively reject inorganic sulfur from raw coal, and the two-stage separate is also very helpful for coal purification.

A CNN-based regression framework for estimating coal ash content on microscopic images

Measurement ◽  
2021 ◽  
pp. 110589
Author(s):  
Weidong Kanghui Zhang ◽  
Weidong Wang ◽  
ziqi Lv ◽  
Lizhang Jin ◽  
Dinghua Liu ◽  
...  
Keyword(s):  
Coal Ash ◽  
Ash Content ◽  
Microscopic Images ◽  
Regression Framework

A Design of an Inclined Froth Zone in Column Flotation Device to Reduce Ash Content in Clean Coal

2015 ◽  
Vol 35 (6) ◽  
pp. 281-294 ◽  
Author(s):  
Chao Ni ◽  
Guangyuan Xie ◽  
Bo Liu ◽  
Yaoli Peng ◽  
Jie Sha ◽  
...  
Keyword(s):  
Ash Content ◽  
Column Flotation ◽  
Clean Coal

The Flotation Process with High Intensity Conditioning and Cleaning for Fine Coal

2014 ◽  
Vol 1010-1012 ◽  
pp. 1636-1639 ◽  
Author(s):  
Ji Hui Li ◽  
Li Qiang Ma ◽  
Yan Zhao Li ◽  
Wen Jing Li ◽  
Jian Wei Yue
Keyword(s):  
High Intensity ◽  
Coal Sample ◽  
Ash Content ◽  
Clean Coal ◽  
Flotation Reagents ◽  
Flotation Process ◽  
Fine Coal ◽  
Percentage Points ◽  
Coal Slime

The properties analyzing of flotation feed sample told that this fine coal sample is high-ash and hard-to-float coal slime. The ash reduction comparison of the step-by-step release flotation test with high intensity conditioning (HIC) or not, and the comparison of flotation test with HIC and adding depressant were made. The results showed that HIC can significantly improve the flotation effect for high-ash and hard-to-float coal slime. Comparing with the traditional step-by-step flotation process, if it meets the demand of ash content is 10.00% and 8.00%, the clean coal yield with HIC will increase 18 and 29 percentage points respectively; comparing with the effect of floatation adding depressant, HIC has more help to reduce the ash content and increase the yield of clean coal. In addition, HIC will save a lot of flotation reagents.

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