scholarly journals Cleaning of Dulmial-Punjab Coal by Froth Flotation

2017 ◽  
Vol 60 (3) ◽  
pp. 169-171
Author(s):  
Muhammad Shahzad ◽  
Zulfiqar Ali ◽  
Asim Siddique
Keyword(s):  
Particle Size ◽  
Froth Flotation ◽  
Maximum Yield ◽  
Ash Content ◽  
Impeller Speed ◽  
Clean Coal

This study was undertaken to assess the cleaning potential of Dulmial-Punjab coal by froth flotation.Release analysis was performed to determine the optimum flotation response of the coal. Number of batchflotation tests were performed to investigate the effects of various parameters such as particle size, impellerspeed, collector dosage, frother dosage and conditioning time on clean coal yield and ash content. It wasfound that maximum yield of 51.25% with 39.5% ash content was achieved at impeller speed, collectordosage, frother dosage and conditioning time of 1600 RPM, 1200 g/t, 200 g/t and 10 min, respectively.

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 The Study of Carbon Recovery from Electrolysis Aluminum Carbon Dust by Froth Flotation

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 145
Author(s):  
Hesong Li ◽  
Jiaoru Wang ◽  
Wenyuan Hou ◽  
Mao Li ◽  
Benjun Cheng ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Mixing Time ◽  
Froth Flotation ◽  
Aluminum Electrolysis ◽  
Carbon Powder ◽  
Molten Salt Electrolysis ◽  
Carbon Recovery ◽  
Aluminum Smelting

A large amount of carbon dust is generated in the process of aluminum smelting by molten salt electrolysis. The carbon dust is solid hazardous waste but contains a large quantity of recyclable components such as carbon and fluoride. How to recycle carbon dust more effectively is a challenge in the aluminum electrolysis field. In this study, X-ray diffraction, scanning electron microscope, and other methods were used to analyze the phase composition of electrolytic aluminum carbon dust. The effects of particle size distribution of carbon dust, impeller speed, reagent addition, mixing time, and flotation time on the flotation recovery of carbon dust were studied. The optimal flotation conditions were obtained and the flotation products were analyzed. The results show that the optimal particle size distribution is 70% of particles below 200 mesh, corresponding to a grinding time of 11 min. The optimum speed of the flotation machine was to be between 1600 and 1800 r/min with the best slurry concentration of 20–30% and 5 min mixing time, and the collector kerosene was suitable for adding in batches. Under the above conditions, the recovered carbon powder with a carbon content of 75.6% was obtained, and the carbon recovery rate was 86.9%.

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%.

scholarly journals Enhanced Separation of Oil and Solids in Oily Sludge by Froth Flotation at Normal Temperature

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2163
Author(s):  
Wenying Li ◽  
Hongyang Lin ◽  
Yang Yang ◽  
Zhenxiao Shang ◽  
Qiuhong Li ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Oil Content ◽  
Froth Flotation ◽  
Hazardous Materials ◽  
Impeller Speed ◽  
Oily Sludge ◽  
Shear Effect ◽  
Flotation Reagent ◽  
Shengli Oilfield ◽  
Pulp Viscosity

Oily sludge (OS) contains a large number of hazardous materials, and froth flotation can achieve oil recovery and non-hazardous disposal of OS simultaneously. The influence of flotation parameters on OS treatment and the flotation mechanism were studied. OS samples were taken from Shengli Oilfield in May 2017 (OSS) and May 2020 (OST), respectively. Results showed that Na2SiO3 was the suitable flotation reagent treating OSS and OST, which could reduce the viscosity between oil and solids. Increasing flotation time, impeller speed and the ratio of liquid to OS could enhance the pulp shear effect, facilitate the formation of bubble and reduce pulp viscosity, respectively. Under the optimized parameters, the oil content of OST residue could be reduced to 1.2%, and that of OSS could be reduced to 0.6% because of OSS with low heavy oil components and wide solid particle size distribution. Orthogonal experimental results showed that the impeller speed was the most significant factor of all parameters for OSS and OST, and it could produce shear force to decrease the intensity of C-H bonds and destabilize the OS. The oil content of residue could be reduced effectively in the temperature range of 24–45 °C under the action of high impeller speed.

Investigation of the Properties of Large and Small Fractions of Municipal Solid Waste

2021 ◽  
Vol 25 (6) ◽  
pp. 26-31
Author(s):  
S.V. Polygalov ◽  
G.V. Il’inykh ◽  
N. Stanisavlevich
Keyword(s):  
Particle Size ◽  
Thermal Properties ◽  
Moisture Content ◽  
Fractional Composition ◽  
Ash Content ◽  
Heat Of Combustion ◽  
Laboratory Studies ◽  
Biological Potential ◽  
Solid Municipal Waste ◽  
Biogenic Components

The results of field and laboratory studies of the component and fractional composition of solid municipal waste (MSW), humidity and ash content of MSW components, which made it possible to evaluate the properties of individual fractions and waste in general, are presented. The fractional composition of MSW was determined by the method of separating waste into five fractions of different sizes: more than 250 mm, 100-250 mm, 50–100 mm, 15–50 mm and less than 15 mm. An assessment of the energy and biological potentials of MSW of various sizes has been carried out. In each fraction, the main biogenic components have been identified, which form the biological potential. The calculation of thermal properties (moisture content, ash, combustible substances, as well as the heat of combustion) for the fractions under consideration has been performed. The dependence of the heat of combustion of MSW on the particle size has been established.

scholarly journals Leaching Chalcopyrite with High MnO2 and Chloride Concentrations

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 107 ◽  
Author(s):  
David Torres ◽  
Luís Ayala ◽  
Ricardo I. Jeldres ◽  
Eduardo Cerecedo-Sáenz ◽  
Eleazar Salinas-Rodríguez ◽  
...  
Keyword(s):  
Particle Size ◽  
Industrial Waste ◽  
Fine Particles ◽  
Froth Flotation ◽  
Chloride Content ◽  
Tailings Dams ◽  
Processing Strategies ◽  
New Processing ◽  
High Chloride ◽  
Chloride Concentrations

Most copper minerals are found as sulfides, with chalcopyrite being the most abundant. However; this ore is refractory to conventional hydrometallurgical methods, so it has been historically exploited through froth flotation, followed by smelting operations. This implies that the processing involves polluting activities, either by the formation of tailings dams and the emission of large amounts of SO2 into the atmosphere. Given the increasing environmental restrictions, it is necessary to consider new processing strategies, which are compatible with the environment, and, if feasible, combine the reuse of industrial waste. In the present research, the dissolution of pure chalcopyrite was studied considering the use of MnO2 and wastewater with a high chloride content. Fine particles (−20 µm) generated an increase in extraction of copper from the mineral. Besides, it was discovered that working at high temperatures (80 °C); the large concentrations of MnO2 become irrelevant. The biggest copper extractions of this work (71%) were achieved when operating at 80 °C; particle size of −47 + 38 µm, MnO2/CuFeS2 ratio of 5/1, and 1 mol/L of H2SO4.

scholarly journals Preparation of clean coal and water mixtures by efficient froth flotation.

1988 ◽  
Vol 14 (6) ◽  
pp. 755-761 ◽  
Author(s):  
Hirofumi Kikkawa ◽  
Hiroshi Takezaki ◽  
Yoshinori Ootani ◽  
Kazunori Shoji
Keyword(s):  
Froth Flotation ◽  
Clean Coal

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

scholarly journals Implementing Feedback Granule Size Control in a Continuous Dry Granulation Line Using Controlled Impeller Speed of the Granulation Unit, Compaction Force and Gap Width

2020 ◽  
Author(s):  
Annika Wilms ◽  
Andreas Teske ◽  
Robin Meier ◽  
Raphael Wiedey ◽  
Peter Kleinebudde
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Control Strategies ◽  
Granule Size ◽  
Oral Dosage ◽  
Impeller Speed ◽  
Median Particle Size ◽  
Dry Granulation ◽  
Median Particle ◽  
Roll Compaction

Abstract Purpose In continuous manufacturing of pharmaceuticals, dry granulation is of interest because of its large throughput capacity and energy efficiency. In order to manufacture solid oral dosage forms continuously, valid control strategies for critical quality attributes should be established. To this date, there are no published control strategies for granule size distribution in continuous dry granulation. Methods In-line laser diffraction was used to determine the size of granules in a continuous roll compaction/dry granulation line (QbCon® dry). Different process parameters were evaluated regarding their influences on granule size. The identified critical process parameters were then incorporated into control strategies. The uncontrolled and the controlled processes were compared based on the resulting granule size. In both processes, a process parameter was changed to induce a shift in median particle size and the controller had to counteract this shift. Results In principle, all process parameters that affect the median particle size could also be used to control the particle size in a dry granulation process. The sieve impeller speed was found to be well suited to control the median particle size as it reacts fast and can be controlled independently of the throughput or material. Conclusion The median particle size in continuous roll compaction can be controlled by adjusting process parameters depending on real-time granule size measurements. The method has to be validated and explored further to identify critical requirements to the material and environmental conditions.

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