To improve the flotation efficiency, achieving the clean production of fine coal, a new method using impact flow conditioning pulp to enhance coal flotation was proposed. Furthermore, the flotation intensification mechanism using impact flow conditioning pulp was studied by SEM-EDS, adsorption measurements, contact angle …Web

A high percentage of high-ash fine slime materials can deteriorate flotation selectivity through surface covering. This covering of the surface is one of the issues that need to be addressed for efficient flotation processing of difficult-to-separate and high-ash coals. In this study, we investigated the depression effect of SPP on high-ash fine mud …Web

The effect of clay types, i.e., kaolinite and montmorillonite on fine coal flotation was further studied [156]. Only a short jump-into-contact was observed in de-ionized water for coal-montmorillonite. This low weak attraction correlates with a lower flotation recovery and worse selectivity for the coal-montmorillonite system compared …Web

1. Introduction. The difficulty in treating coal slime in the presence of clay minerals is well known in the coal preparation plant. Clay minerals (kaolinite, illite, and montmorillonite) have a detrimental effect on fine coal flotation because of mechanical coating and water entrainment, leading to low flotation recovery and poor flotation …Web

Since this separation techniques do not require any reagents, it poses …Web

Without this flotation step, the fine coal would upset the specific gravity range of the natural media and create a large circulating load of coal fines in the media. The media is a closely controlled fraction from the tailings produced by the main flotation section with respect to density and size ( — 60, + 250 mesh).Web

A rheology study was performed to understand the particle-particle interaction prevailing in the coal flotation process. Some researchers (Li et al. 2017; Wang and Peng 2013;Xing, Gui, and Cao ...Web

Coal flotation is the only fine coal cleaning process that is effective in treating −0.15 mm size coal. Because of coal high natural hydrophobicity it may appear to be easy to float, but the wide range of surface properties of coals from various ranks, and various degrees of liberation of the treated particles make the process very often ...Web

Froth flotation is widely used in the coal industry to clean −28 mesh fine …Web

Flotation is one of the most used methods to upgrade natural graphite resources. However, the efficiency is usually decreased due to the entrainment of undesirable fine gangue minerals. In this work, the impact of different factors such as particle size, pulp density, and flotation reagent on the entrainment of mica and quartz …Web

Fine coal particles (<0.5 mm) of metallurgical coals are treated using flotation, while the fine coal fractions (<0.5 mm) used for power generation are usually untreated and transported to ...Web

1. Introduction. Flotation is an effective method to recover fine coal slime [1].The low momentum of ultrafine coal particles, which produced from the processes of mining, transporting, and crushing, lead to a serious flotation problem because the low probability of attachment between the particles and bubbles [2], [3], [4].Web

A second issue regarding froth flotation, especially that of ultra-fine coal, is whether or not it would be economically viable to 'de-slime' the feed to the cells. Ultra-fine coal has a very large surface area per unit mass, approximately 53 000 m2/ton. During flotation, the surface of the coal particles needs to be coated with a collector andWeb

The separation behavior of fine coal in flotation rate test is similar to that of industrial mechanically agitated flotation machine. The higher the flotation probability of particles is, the shorter the flotation time is needed. With the same flotation fluid environment and reagent system, the time of coal staying in the flotation cell is the ...Web

Clean coal particle (−45 μm) size fraction was used for the micro flotation tests. For the flotation experiments, the square tube (30 × 30 × 150 mm) was filled with 5 g/L coal suspension (Fig. 1).Coal suspension was pretreated by 5 min stirring process at 600 rpm, and the aerating rate was 2 cm 3 /min. The floated products were collected for …Web

Introduction. Froth flotation is one of the most widely used processes to recover fine coal particles from associated gangue. Slurry concentration for coal flotation is normally arranged at a lower level (approximately corresponding to 100 g/L) due to its great froth yield.Therefore, a high amount of water is used in the coal flotation process.Web

Flotation is commonly used to treat fine coal (typically below 500 microns in size) and is a complex, three-phase process that is controlled by factors which can be divided into three facets: coal, chemistry and machine. It is most often used for treating metallurgical coal fines where the value of the product can justify the added ...Web

Coal flotation is the most proficient technique used to improve the nature …Web

1.. IntroductionConventional froth flotation for fine coal cleaning suffers mainly from two problems: (i) a lack of selectivity for fast floating high rank coals due to the flotation of middlings and entrainment of mineral fines in the froth, and (ii) low recoveries for heavily oxidized or low rank coals due to poor adhesion between bubbles and particles.Web

The flotation tests of fine coking coal were done in a 0.5 L XFD flotation cell without any usage of flotation collector in order to study the natural floatability of coal particle. Six flotation models were used to assess how the particle shape affects the flotation behavior of fine coking coal of different size fractions. The results showed ...Web

Flotation is considered an appropriate method to remove minerals, including pyrite, from fine coal; this method takes advantage of the difference in the wettability between minerals and coal [11], [22], [23]. However, large numbers of liberated pyrite particles have been recovered in many fine coal flotation operations.Web

Coal flotation is the most proficient technique used to improve the nature of fine …Web

In the past few decades, microbubble flotation has been widely studied in the separation and beneficiation of fine minerals. Compared with conventional flotation, microbubble flotation has obvious advantages, such as high grade and recovery and low consumption of flotation reagents. This work systematically reviews the latest advances …Web

The separation technologies applicable for coal dewatering are in particular dependent on the coal particle size, with centrifuges (vibrating basket and screen scroll types) most suitable for the coarser fractions, while vacuum and pressure filters, as well as SBCs, are suitable for fine coal cleaned by flotation.Web

Mechanical flotation cells, the most widely used equipment in the cleaning of coal fines (< 0.500 microns), become ineffective in the processing of ultra-fines (< 250 microns) due to the entrainment of gangue minerals to the froth, which mandates further cleaning stages [1, 2].Conventional mechanical flotation cells (Fig. 1A) have a …Web

Pyrite recovery mechanisms in coal flotation. In most operating coal-cleaning plants, a significant amount of pyrite is recovered in the froth during flotation of high-sulfur coal. This pyrite recovery is commonly believed to be a result of pyrite particles floating due to hydrophobicity. However, even though a wide range of pyrite depressants ...Web

This is the first monograph on the processing of fine coal which recognizes that all unit operations that handle fine coal depend on coal surface properties, and which in one single volume provides a …Web

Role of collector polarity and size on the low-rank fine coal flotation. The nature of interaction between coal surface and collector molecule affects the yield of fine coal flotation. The interaction depends on coal surface …Web

@article{osti_10107310, title = {Fine coal flotation plant waste comparison--column vs. sub-a cells. Final technical report, September 1, 1990--August 31, 1991}, author = {Ehrlinger, III, H P}, abstractNote = {The objective of this project was to compare results from a small commercially sized Deister Flotaire column flotation cell with the subaeration …Web

ABSTRACT. Flotation is commonly used to treat fine coal (typically below 500 microns …Web