study on dewatering of fine coal by combination of terence osborn

The solid-solid separation processes employed by modern coal preparation plants require large amounts of process water that must be removed from the surfaces of particles using mechanical dewatering equipment. Unfortunately, the existing processes that are used to dewater fine particles are inefficient in terms of moisture reduction and/or solids recovery.

The present research utilises a novel concept of applying the synergistic effects of flocculants, surfactants and pH of the suspension in a single-stage treatment to dewater and filter the ultrafine clean coal by using conventional vacuum filtration. Furthermore, in this study, the use of surfactant pretreatment to reduce the amount of …

The combination of suspended fine coal particles by flocculation has been extensively adopted to speed up the settling particles in coal preparation plant processing [6], [7]. Although the type and dosage of flocculants go hand in hand with the desired settling rate and the water clarity values of coal slurry, the most common flocculants are ...

Beneficiation of coal is a water intensive process, and the water is recovered in downstream operations in the high rate thickener (HRT) and vacuum belt filtration …

By altering the surface wettability, surfactants can be also used to improve the efficiency of fine coal dewatering and restrain fly coal dust [25, 26]. Researches have shown that cationic ...

Gul Bahar Basim (ABSTRACT) Fine coal constitutes a relatively small portion of a product stream in a coal cleaning plant. However, its processing cost is approximately three times higher than the cost of processing coarse coal. Therefore, many coal companies chose to discard the fines to refuse ponds, causing a loss of profit and creating ...

Dewatering of fine clean coal and refuse slurry is one of the most important aspects of coal cleaning scenario. It is also adds significant cost to the price of clean …

Lowering of filter cake moisture of ultra-fine (d 30 ≈ 25 μm) coal to a 20 percent level using the conventional vacuum filtration could be achieved using a combination of metal ions and surfactants. Pretreating coal slurry with about 0.2 Kg/ton of a surfactant and 50 ppm of copper or 10 ppm of aluminum ions provided filter cake containing 22.8 percent moisture.

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Semantic Scholar extracted view of "Advanced solid-liquid separation for dewatering fine coal tailings by combining chemical reagents and solid bowl centrifugation" by Cuong V. Nguyen et al. ... The present paper is a part of the study done on settling of coal fines by flocculation to enhance the clarification efficiency, such that …

Dewatering of fine clean coal and refuse slurry is one of the most important aspects of coal cleaning scenario. It is also adds significant cost to the price of clean coal. This article summarizes ...

With enhanced awareness of energy conservation and environmental protection, more attention has been paid to the high moisture content of the filtration products used in the flotation process as commonly employed in coal preparation plants. In this paper, we choose fine coal (–0.5mm) samples obtained from the Xiqu Coal …

This paper reviews application of different coagulants/flocculants and their combinations in dewatering mechanisms. In this context, various polymeric flocculants are discussed in the coal slurry in depth. ... B.K. Dewatering of fine coal and refuse slurries-problems and possibilities. Procedia Earth Planet. ... Zhou, Z. Electrokinetic study of ...

Solid bowl centrifuges, used worldwide for cost effective fine particle recovery, have been successfully customized for recovery and dewatering of fine coal. When the screen drain material is processed …

@article{osti_10182897, title = {Dewatering studies of fine clean coal. Technical report, March 1, 1992--May 31, 1992}, author = {Parekh, B K}, abstractNote = {Physical cleaning of ultra-fine coal using an advanced froth flotation technique provides a low ash product, however, due to high surface area of particles the amount of water …

The dewatering performance of 25 fine coal samples taken from 21 Australian coal preparation plants has been studied. Coal equilibrium moistures, surface …

The main objective of the present research program is to study and understand the dewatering characteristics of ultra-fine clean coal and to develop the process parameters to effectively reduce the moisture to less than 20 percent in the clean coal product. ... it was reported that a combination of metal ion and surfactant provided …

The adsorption kinetics of DAB and SDS on fine clean coal at their natural pH (5.2) are plotted as amount of adsorbent (mg/g) at 25 and 60°C, respectively (Fig. 2).Both surfactants adsorbed rapidly and equilibrium adsorption was reached within a contact time of 150 s, which is less than the typical 4 min dewatering time used on the coal sample.. …

® HI-G Dewatering machines were recommended to assist in dewatering the thickened solids. The units are now operating in combination with filter presses to provide on-line dewatering of the solids. Clear water is recirculated to the washery, and dewatered solids are taken to a storage yard for disposal/sale. In the plant, tailings

This study aims to employ laboratory experiments to examine coal permeability variation induced by coal fines generation and migration during the dewatering stage. One coal sample from Bowen Basin ...

An improved method of dewatering fine coal (−500 μm) by vacuum filtration was developed and optimized. Tests on a bench scale vacuum filter showed that when a filter cake was deliberately ...

Abstract. A study using an experimental design of pressure filtration for fine coal dewatering is presented. The effects of five major process parameters of the …

Abstract. Characterization of fine coal tailings using a variety of techniques reveal that it is composed of 30% clay minerals (kaolinite and illite), 23% muscovite, 26% quartz and 20% coal with ...

The presence of clay minerals in coal tailings leads to a significant deterioration during the dewatering process. In this study, a cationic surfactant, stearyl trimethyl ammonium chloride (STAC), was considered to enhance the dewatering efficiency of coal tailings. The effect of STAC on coal tailing dewatering was evaluated by the …

A comparative flocculation filtration study was performed for enhancing dewatering of ultrafine coal using vacuum, hyperbaric, and centrifugal filters. ... The cationic and anionic flocculants were added into the slurry individually or in combinations. Vacuum filtration results showed that use of flocculants increased filtration rate by several ...

Dewatering Screens have a wide variety of applications, including dewatering, desliming, degritting, rinsing, scrubbing, sizing and washing. They are designed to produce a consistent drip-free product and handle materials such as sand, gravel, crushed aggregates, frac sand, industrial sands, mineral sands, hard rock, precious metals ore, …

An improved method of dewatering fine coal (−500 μm) by vacuum filtration was developed. Tests on a bench scale vacuum filter showed that when the applied vacuum was interrupted during the dewatering cycle, a lower final moisture content could be achieved. There was also an increase in the dewatering rate, as well as a lower …

Solid-liquid separation as applied to dewatering fine coal tailings poses a major technological and environmental challenge to the coal industry to advance …

@article{osti_1400259, title = {Cleaning and dewatering fine coal}, author = {Yoon, Roe-Hoan and Eraydin, Mert K. and Freeland, Chad}, abstractNote = {Fine coal is cleaned of its mineral matter impurities and dewatered by mixing the aqueous slurry containing both with a hydrophobic liquid, subjecting the mixture to a phase separation. …

Two important aspects of dewatering fine coal are the dewatering rate and the final moisture content of the product produced; the most desirable conditions would be to have a fast dewatering or ...

For this sample, keeping the differential pressure between 1.1-1.3 MPa can reduce the permeability damage induced by coal fines. This study delivers fundamental understandings of coal fines generation and migration behaviours during the dewatering stage, which can provide useful guidelines to implement effective dewatering strategies …

Flocculation is a widely used method for dewatering fine coal tailings. Flocs must resist to the shear stresses during the following processes such as flotation, cyclone separation, and pumping ...

Conclusions. Flocculation followed by filtration is a new concept for the dewatering of coal plant tailings. This study clearly indicates that the proper use of flocculant in filtration was very important to achieve efficient filtration performance. At the optimum dosage, the flocculant improved the dewatering process.

An improved method of dewatering fine coal (−500 μm) by vacuum filtration was developed and optimized. Tests on a bench scale vacuum filter showed that when a …

An improved method of dewatering fine coal (−500 μm) by vacuum filtration was developed. Tests on a bench scale vacuum filter showed that when the applied vacuum was interrupted during the ...

Due to the tacky nature of the binder, it was felt that by reducing its viscosity using a solvent, the binder could more effectively coat the fine coal surfaces. This study investigated the efficiency of a solvent/binder combination for reducing the viscosity of the Orimulsion for the dewatering of fine coal, and making robust briquettes from ...

In order to improve the dewatering rate and the effect of fine clean coal (FCC), the advanced method of fine coal (−0.5 mm) dewatering and the correlated basic theory were investigated in this ...

Beneficiation of coal is a water intensive process, and the water is recovered in downstream operations in the high rate thickener (HRT) and vacuum belt filtration (VBF). Clean coal particles entering the HRT have an inherent tendency to enter the overflow because they are extremely fine and hydrophobic. Hence, flocculants (polymers) are …

Semantic Scholar extracted view of "XPS investigation of the dewatering of fine coal using silicone additives" by M. Owen et al. Skip to search form Skip to ..., title={XPS investigation of the dewatering of fine coal using silicone additives}, author={Michael J Owen and Terence John Swihart}, journal={Fuel}, year={1984}, volume={63}, pages ...

1. Introduction. Coal has historically been a major contributor to economic growth of many countries as a key source of energy. However, the natural friability, mechanized mining, handling system and size reduction methods have led to increase in production of coal fines (Hazlioglu, 2012).Statistics show that over 30 billion metric …