Challenges of using froth features to predict clean coal ash content in coal flotation

2020 ◽  
pp. 1-37
Author(s):  
Jiakun Tan ◽  
Long Liang ◽  
Yaoli Peng ◽  
Guangyuan Xie
Keyword(s):  
Coal Ash ◽  
Ash Content ◽  
Clean Coal ◽  
Coal Flotation

Correction of froth gray value in the prediction of clean coal ash content in coal flotation

2021 ◽  
pp. 1-14
Author(s):  
Jiakun Tan ◽  
Long Liang ◽  
Yaoli Peng ◽  
Guangyuan Xie
Keyword(s):  
Coal Ash ◽  
Ash Content ◽  
Clean Coal ◽  
Coal Flotation

Study on Drainage Oil to Prepare Collectors of Coal Flotation

2013 ◽  
Vol 734-737 ◽  
pp. 901-905 ◽  
Author(s):  
Jian Li Yang ◽  
Mei Li Du ◽  
Jing Liu ◽  
Chun Xia Yu
Keyword(s):  
Fatty Acid ◽  
Coal Ash ◽  
Raw Material ◽  
Coal Preparation ◽  
Clean Coal ◽  
Coal Flotation ◽  
Coal Preparation Plant ◽  
Preparation Plant ◽  
Plant Efficiency ◽  
Hydrocarbon Oil

At present, kerosene is one of the most widely used non-polar hydrocarbon oil collector agent in coal flotation in China, kerosene is difficult to dissolve in water, with good collector, but the dosage is comparatively large in the actual production.The drainage oil is from the dining recycled goods and the waste of animal flesh, can be used for preparation of fatty acid collector, which not only to reduce environmental pollution,but also to reduce the risk of food safety. At the same time, if drainage oil can replace the kerosene in coal collection, it will improve the coal preparation plant efficiency and solve the problem of shortage of national resources. In this study, we use Huangling coal as raw material for flotation experiment, use kerosene, diesel, drainage oil and emulsified drainage oil as collectors. Adding different collectors in the same flotation conditions to research the yield of clean coal, the clean coal ash and the yield of tailings by changing the dosage of collectors. The results show when adding to OP emulsifier and the proportion of water and oil is 6:4, flotation effects is the best, the yield of clean coal is 88.67%, the ash of clean coal is from 9.16% down to 8.63%, the yield of tailings is 11.32% .

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 of Flotation Effect of ST-1 Complex Reagent

2012 ◽  
Vol 610-613 ◽  
pp. 3357-3361
Author(s):  
Deng Gao Ji ◽  
Su Qin Peng ◽  
Yue Wu ◽  
Yang Hui Cai
Keyword(s):  
Zeta Potential ◽  
Coal Ash ◽  
Clean Coal ◽  
Flotation Reagents ◽  
Coal Flotation ◽  
Chemical Products

There are lots of problems in coal flotation reagents. For example, it is difficult to disperse in coal pulp, it needs a large consumption, and its selectivity is poor. So this paper refers that kerosene can be made into compound kerosene by using different chemical products and surfactants, and then used for coal flotation. Tests proved that when the ST-1 Complex Reagent dosage is 500g/t, kerosene dosage is 900g/t, clean coal ash consistent is the same, and clean coal yield is closed, collector dosage saved 44.44%, and the fastest floating speed of clean coal is 99.3g/min, 4.8g/min fast than kerosene, Zeta potential is-28.9409mv after kerosene effect, Zeta potential is -13.2555mv after ST-1 Complex Reagent effect.

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.

scholarly journals Recovery of clean coal from blast furnace dusts by flotation column

2020 ◽  
Vol 61 (1) ◽  
pp. 124-131 ◽  
Author(s):  
Tran Van Duoc ◽  
Nguyen Hoang Son ◽  
Nhu Thi Kim Dung ◽  
Vu Thi Chinh ◽  
Keyword(s):  
Blast Furnace ◽  
Ash Content ◽  
Wash Water ◽  
Solid Concentration ◽  
Flotation Reagent ◽  
Clean Coal ◽  
Flotation Column ◽  
Coal Flotation ◽  
Coal Product ◽  
Water Rate

The paper presents the results of the study on recovery of clean coals from blast furnace dusts of the Cao Bang Iron Steel plant. The study has explored the effects of the most important operating parameters on the coal flotation performance including flotation reagent dosage, solid concentration, froth wash-water rate, flotation time and the froth thickness. The results of the study showed that using a combination of a rougher and a cleaning flotation operations at respectively collector dosage, solid concentration, flotation time, froth wash-water rate and froth thickness of 1000 g/t, 100 g/l, 10 minutes and 1.5 l/minute and 450 mm, has obtained a clean coal product with the yield, ash content and combustible matter recovery respectively of 44.90%, 19.15% and 77.63%. The clean coal has met the quality strandards requirements of the fuel for sintering.

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

Role of Magnesium Salts in Coal De-Ashing by Flotation

2021 ◽  
Vol 58 (1) ◽  
pp. 51-58
Author(s):  
Rawya Gamal ◽  
Nader A.A. Edress ◽  
Khaled A. Abuhasel ◽  
Ayman A. El-Midany ◽  
Salah E. El-Mofty
Keyword(s):  
Particle Size ◽  
Strong Interaction ◽  
Statistical Design ◽  
Ash Content ◽  
The Other ◽  
Pulp Density ◽  
Statistical Design Of Experiments ◽  
Coal Flotation ◽  
Magnesium Salts

Abstract The most frequently investigated salts in coal flotation are chlorides. However, seawater contains additional salts such as sulfates. In coal flotation, magnesium chlorides showed the best results in terms of higher yield and lower ash content compared to the other magnesium salts studied. Therefore, two magnesium salts were tested in this investigation, namely magnesium chloride and magnesium sulfate. The effect of the magnesium salts as well as the optimization of coal flotation were investigated by statistical design of experiments in terms of pulp density, particle size, conditioning time and different dosages of MgCl2 and MgSO4. The flotation results obtained by statistical design show that the ash content was lowest at 8.2% when a mixture of 2 kg/t MgSO4 and 2 kg/t MgCl2 has been used, with pulp density 20%, particle size 400 lm and conditioning time 15 min. The particle size plays an important role in reducing the ash content when the conditioning time has been extended and pulp density has been reduced. The strong interaction between the salts hinders the reduction of the ash content to less than 8.2%.

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