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An effective flotation collector determines the flotation performance and efficiency of fine coal particles. Generally, hydrocarbon oils, such as diesel and kerosene are widely applied in the flotation circuit in coal preparation plants. However, hydrocarbon oils are not effective enough for difficult-to-float coals, such as low rank coal and difficult …
The particle size composition of the coal sample is one of the crucial factors used to determine the flotation effect of low rank coal. Coal samples of sizes 0.5–0.25 mm, 0.25–0.125 mm, 0.125–0.074 mm, 0.074–0.045 mm and −0.045 mm were obtained using the wet screening method.
raw material for making coal water slurry (CWS) after being upgraded. In recent years, the demand for coal to product CWS has increased rapidly [3–6]. Therefore, the use of LRC slime to make CWS can greatly improve the economic benefits of the enterprise and reduce environmental pollution. Flotation is an e ective way to upgrade …
How to improve coal flotation performance has been examined with a focus on the effect of particle size on flotation conditioning. A coking coal sample collected from the flotation feed of a coal preparation plant located in Lu'an, Shanxi province of China was investigated. The characters including mineral composition, size fraction, density ...
The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic acid-dodecane (OA-D), oleic acid (OA), and dodecane (D) were employed to treat the low rank coal for revealing new synergistic mechanism of the mixed collector. First the surface free energy of the …
@article{osti_6388210, title = {Improving reagent regime of coal sludge flotation}, author = {Preobrazhenskii, B P and Toporkova, N I}, abstractNote = {Considering the possibility of attachment of a heteropolar reagent not to the surface of the coal, but to the water-air and oil-water interfaces (when using known slurry preparation schemes), it was practical to …
Coal flotation is the most proficient technique used to improve the nature of fine particles by diminishing pollution substance (Majumder and Barnwal, 2011 ). The hypothesis of froth flotation is complex and has not been fully comprehended.
Abstract. The action of inorganic reagents in coal flotation is analyzed, with a view to improving enrichment. Sulfates of calcium, magnesium, and iron most likely act by diminishing the hydration of coal particles as a result of the surface adsorption of cations. The positive influence of a natural salt solution consisting primarily of NaCl on ...
Froth flotation of a fine coal sample was carried out under steady and oscillatory air flow conditions in a semi-continuous flotation column. The effects on the flotation performance were compared. It was found that use of oscillatory air flow could lead to substantial frother cost savings and help improve the separation efficiency.
Column flotation cells have become increasingly popular in the coal industry due to their ability to improve flotation selectivity. The improvement can be largely attributed to the use of froth washing, which minimizes the nonselective entrainment of ultrafine minerals matter into the froth product. Unfortunately, the practice of adding
Dispersants.Many low molecular weight polymers (MW < 100 000 daltons) adsorb onto coal surfaces and can be used as dispersants for coal–water suspensions.All good coal dispersants are also very efficient depressants for coal flotation (Pawlik, 2005).Both anionic (e.g., carboxym-ethyl cellulose, humic acid, polystyrene sulfonate, etc.) and non-ionic …
Improving Coal Flotation by Gaseous Collector Pretreatment Method and its Potential Application in Preparing Coal Water Slurry. Liang Shen, F. Min, Liu Lingyun, Changguo Xue, Jinbo Zhu; Materials Science. Processes. 2019; Low-rank coal is difficult to upgrade using conventional flotation methods due to its high hydrophilic properties.
Later, showed that using waste motor oils can enhance the performance of low rank coal slime flotation with total yield of 77.29% and only 8.97% ash content at …
The higher dosage (0.05 kg/ton) of frother could not improve the result. Effect of depressant. ... The optimum conditions of a typical coal froth flotation test given in Table 3 describe that the rougher flotation coal concentrate was achieved using a coal size of almost 100 % passing 200 mesh, pulp pH of 9, pulp density of 25%, agitation speed ...
Research on Mechanisms of Improving Flotation Selectivity of Coal Slime by Adding Sodium Polyphosphate 1. Introduction. In recent years, to maximize coal production and utilization, coal mining …
How to improve coal flotation performance has been examined with a focus on the effect of particle size on flotation conditioning. A coking coal sample collected from the …
2.2. Flotation tests. Coal flotation was conducted in a 1.5 dm 3 JK batch flotation cell using de-ionised water. For each test, 100 g dry coal sample was added into 0.7 dm 3 water and stirred for 3 min at an agitation speed of 1200 rpm to achieve the sufficient dispersion of coal particles. Then the slurry was topped up to 1.5 dm 3 by …
To explore the occurrence and distribution characteristics of fine-grained pyrites in coal and the effect of pyrite particle size on flotation efficiency, coal samples from Guizhou province and Shanxi province, China, were selected for pyrite morphology observation and sulfur content test before and after flotation desulfurization experiments …
Froth flotation is the most widely used method for beneficiation of fine coals. In flotation, the size of air bubbles is an important factor affecting the separation efficiency. The size of air bubbles generated by passing air through a bubble diffuser/sparger can be reduced by changing the air flow pattern from steady to oscillatory. In the present work, …
Results and Discussion. A unique collector dispersion techniques was developed and used to improve the flotation rate and recovery of coarser and ultrafine coal-rich particles in the froth flotation …
Flotation of fine coal slurry. Full size table. In order to improve the effectiveness of coal flotation with an elevated content of fine slurry, we consider the …
To improve LRC flotation response, a new method based on the expansion of wettability difference was proposed in this investigation. This method is that changing the adsorption liquid environment (adding Ca 2+ ) to enhance the selective adsorption of surfactants on the surface of organic matter and increase its hydrophobicity, meanwhile ...
In the coal/DTAB/water system, the coal-water interaction was the smallest and the number of hydrogen bonds formed was the lowest. DTAB can promote the migration of water molecules, improve the hydrophobicity of low-rank coal surface and increase the flotation efficiency.
The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic acid-dodecane (OA–D), oleic acid (OA), and ...
Semantic Scholar extracted view of "Improving coarse particle flotation using the HydroFloat™ (raising the trunk of the elephant curve)" by J. Kohmuench et al. ... ABSTRACT Although extensive research has been done on improving the separation performance of coarse coal in the minerals processing industry, there is still a gap …
Low-rank coal is difficult to upgrade using conventional flotation methods due to its high hydrophilic properties. Thus, it is necessary to explore new methods for upgrading and utilizing low-rank …
Low-rank coal is difficult to upgrade using conventional flotation methods due to its high hydrophilic properties. Thus, it is …