dewatering ultrafine coal

  • Dewatering of Ultrafine Coal by Filtration

    Dewatering of a -0.5 mm fine coal has been studied extensively. Deep cleaning requires however fine grinding, and dewatering of such ultrafine products presents a great challenge. Several coal samples finely ground and characterized by different wettabilities have been used in the filtration tests. Vacuum and press filters have been employed.

  • Dewatering Ultrafine Coal by Vacuum Filtration

    There are apparently very significant differences in filtration and dewatering between -500 µm fine and -25 µm ultrafine coal size fractions. Emulsions are very powerful and promising filtration/dewatering aids for both ultrafine and fine fractions of hydrophobic and hydrophilic coal

  • Ultrafine coal dewatering: Relationship between

    Ultrafine coal dewatering: Relationship between hydrophilic lipophilic balance (HLB) of surfactants and coal rank. It is reported that surfactants with low HLB numbers have better performance in hard coal dewatering (Asmatulu, 2001, Yoon et al., 2004,

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  • Ultrafine coal dewatering: Relationship between

    Ultrafine coal (−150 μm) can be effectively cleaned using advanced separation techniques such as column flotation, however, dewatering it to below 20 percent moisture level using the

  • Installation of Sub325 Centrifuge for Dewatering of Ultra

    This article follows the initial on-site testing, installation, and then long-term testing of the Sub325 solid bowl dewatering technology to recover and dewater ultra-fine coal. Losses from the original fine-coal circuits are quantified and found to be much larger than shown on a typical plant flow sheet.

  • Enhanced ultrafine coal dewatering using flocculation

    Ultrafine coal dewatering 165 Fig. 1 Schematic illustration of the hyperbaric filter system. For the centrifugal dewatering tests an IEC Chemical Centrifuge (International Equipment Co.) with a metal basket of 5-in. diameter was used. Each test was performed using 1000 ml slurry and 30 second dewatering time which is defined as the duration of

  • Cited by: 56
  • (PDF) HYDROPHOBIC-HYDROPHILIC SEPARATION (HHS) PROCESS

    hydrophobic-hydrophilic separation (hhs) process for the recovery and dewatering of ultrafine coal Conference Paper (PDF Available) · February 2016 with 485 Reads How we measure 'reads'

  • Dewatering Ultrafine Clean Coal in a T. H. Filter Press

    May 18, 2010· This study demonstrates a low-cost, high-efficiency filter press technology for dewatering minus 150 µm column flotation clean coal products from two coal mines. Pilot-scale in-plant demonstration of this technology at these two locations provided stable, trouble-free operation while achieving an excellent dewatering performance at a high throughput.

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  • Installation of Sub325 centrifuge for dewatering of ultra

    Jun 01, 2016· Free Online Library: Installation of Sub325 centrifuge for dewatering of ultra-fine coal.(FINE COAL RECOVERY) by "Coal Age (1996)"; Business Petroleum, energy and mining Centrifuges Economic aspects Quality management Coal fired power plants Analysis Design and construction Equipment and supplies Coal-fired power plants

  • Electrokinetic Dewatering of Ultrafine Coal and Coal Tailings

    Verify the applicability of electrokinetic dewatering to a range of ultrafine coal products and coal tailings. Characterise the dewatering efficiency and effectiveness and consequent potential economic benefits for different electrokinetic treatment regimes for both in-situ and in-process dewatering

  • HYDROPHOBIC-HYDROPHILIC SEPARATION (HHS)

    Coal Prep, Feb 26, 2:00-4:00 pm 1 HYDROPHOBIC-HYDROPHILIC SEPARATION (HHS) PROCESS FOR THE RECOVERY AND DEWATERING OF ULTRAFINE COAL Nikhil Gupta, Biao Li, Gerald Luttrell, Roe-Hoan Yoon and Robert Bratton, Virginia Tech, Blacksburg, VA James Reyher, Minerals Refining Company, Richmond, VA Abstract

  • Ultra Fine Coal Reclamation Somerset Coal International

    An independent coal industry consultant, Weir International Inc., conducted an extensive 18-day testing procedure over the trial period at a Northern App coal mine. It determined that Somerset’s Sub325 ® fine coal recovery system is “ effective in dewatering the fine coal slurry and producing a saleable dewatered fine coal product.

  • Dewatering of Ultrafine Coals and Tailings by

    Dewatering of ultrafine coal and tailings is a big challenge to the coal industry. In this project, the dewatering of ultrafine coal and tailings in the presence of chemicals (anionic and cationic surfactants, and anionic flocculants) were investigated using surface characterisation techniques, lab scale dewatering facilities, and pilot scale solid bowl centrifugation.

  • INSTALLATION OF SUB325™ CENTRIFUGE FOR

    DEWATERING OF ULTRA-FINE COAL Authors T. Anthony Toney, Nick Massini, Cliff Raleigh Somerset Coal International ABSTRACT Since the late 1980’s, screen bowl centrifuge technology has been widely applied in coal preparation for recovery and dewatering of fine and ultra-fine coal

  • Effects of Vacuum Filtration Parameters on Ultrafine Coal

    A continuous filter leaf dewatering system and a small-scale drum filter were employed to investigate effects of cake formation time, cake drying time, flocculant conditioning time, feed size distribution, slurry agitation intensity etc. Results have shown that ultrafine coal dewatering performance evaluated by cake moisture, solids throughput

  • Dewatering technology successfully tested at coal cleaning

    Sep 15, 2010· One is the novel dewatering aids that are currently marketed by Nalco Company. The other is a technology that may be more useful for recovering and dewatering the ultrafine coal from existing impoundments, according to Yoon. Virginia Tech has applied for a patent for this new technology.

  • The use of a solid-bowl centrifuge for ultrafine coal

    This study was conducted for Electric Power Research Institute's (EPRI's) Upgraded Coal Interest Group (UCIG) to evaluate ultrafine dewatering technologies. The objective was to increase the solids concentration of an ultrafine coal discard stream to a level suitable for use as a coal-water slurry fuel, while maximizing overall solids recovery.

  • Coal dewatering technology turns sludge to powder

    Coal dewatering technology turns sludge to powder Newswise Because there has been no economically viable technology to remove water from ultrafine coal slurries, the ultrafine particles that are the residue of the coal cleaning process have been discarded into hundreds of impoundments.

  • ULTRAFINE COAL SINGLE STAGE DEWATERING ANfiAW 4

    ultrafine coal pelletizing machine has been built and tested to optimize the ultrafine coal dewatering efficiency, and at the same time, fabricate strong and robust coal pellets to meet coal transportation needs. INTRODUCTION AND BACKGROUND In the ultrafine coal cleaning process, small coal particles (-400M x 0) are produced during

  • 22 dec 2011 FINAL DISSERTATION WCC dissertation

    The aim of this research project was to test the response of ultra fine coal sourced at Klipspruit Colliery to froth flotation and the response of the froth flotation products to dewatering using two different types of filter presses, namely the Tecnicas Hidraulicas (TH) and

  • Dewatering technology for ultrafine coal Filtration

    Mar 20, 2009· The technology can dewater ultrafine coal. Very fine coal with the consistency of talcum powder usually has to be discarded by even the most advanced coal cleaning plants because its moisture content in conventional dewatering systems make it impossible to sell on.

  • Abstract: FINE Refuse and Ultrafine Coal Dewatering

    Dewatering has been a technical and economical barrier to the stabilization of coal tailings and the utilization of ultrafine coal particles from coal preparation. While substantial progress continues to be made in conventional dewatering technologies, a non-conventional approach to dewatering utilizing an osmotic gradient was investigated as a

  • ultrafine iron ore dewatering systems Solution for ore

    Dewatering of Ultrafine Coal by Filtration. Dewatering of a 05 mm fine coal has been studied extensively Deep cleaning requires however fine grinding and dewatering of such ultrafine products presents a great challenge Several coal samples finely ground and characterized by different wettabilities have been used in the filtration tests Vacuum

  • Improved Ultrafine Coal Dewatering Using Different

    Ultrafine coal originating from a thickener underflow is known to be difficult to dewater owing to factors such as filter cloth blockage and moisture retention due to clogging. Mixing of finer and coarser materials has been proposed to deliver better dewatering efficiency and improved the quality of the recycled water (Kenney, 1994)."

  • Dewatering technology for ultrafine coal Filtration

    Mar 20, 2009· The technology can dewater ultrafine coal. Very fine coal with the consistency of talcum powder usually has to be discarded by even the most advanced coal cleaning plants because its moisture content in conventional dewatering systems make it impossible to sell on.

  • Improved Ultrafine Coal Dewatering Using Different

    Ultrafine coal originating from a thickener underflow is known to be difficult to dewater owing to factors such as filter cloth blockage and moisture retention due to clogging. Mixing of finer and coarser materials has been proposed to deliver better dewatering efficiency and improved the quality of the recycled water (Kenney, 1994)."

  • Dewatering Of Fine And Ultrafine Coal Hydrocyclone Separator

    The dewatering of fine and ultrafine coal is one of the most important area of coalpreparation. Not only does it enable maximisation of revenue from existing reserves andplant products by reducing moisture, but it also enables coal currently discarded to berecovered.

  • ultrafine iron ore dewatering systems Solution for ore

    Dewatering of Ultrafine Coal by Filtration. Dewatering of a 05 mm fine coal has been studied extensively Deep cleaning requires however fine grinding and dewatering of such ultrafine products presents a great challenge Several coal samples finely ground and characterized by different wettabilities have been used in the filtration tests Vacuum

  • Project Title: FINE REFUSE AND ULTRAFINE COAL

    Dewatering has been a technical and economical barrier to the stabilization of coal tailings and the utilization of ultrafine coal particles from coal preparation. While substantial progress continues to be made in conventional dewatering technologies, a non-conventional approach to dewatering utilizing an osmotic gradient was

  • Abstract: FINE Refuse and Ultrafine Coal Dewatering

    Dewatering has been a technical and economical barrier to the stabilization of coal tailings and the utilization of ultrafine coal particles from coal preparation. While substantial progress continues to be made in conventional dewatering technologies, a non-conventional approach to dewatering utilizing an osmotic gradient was investigated as a

  • v119n3a10 Improved ultrafine coal dewatering using

    Improved ultrafine coal dewatering using different layering configurations relationship with the product surface moisture content (Arnold, 1999). The final filter cake moisture is influenced by modification of the coal surface, type of surfactant, type of dewatering device, conditioning time, and the pH value of the system (Nkolele, 2004).

  • Large-scale design and testing of an improved fine coal

    (-500 μm) and ultrafine (-100 μm) material. It has been reported that as much as 14 per cent Large-scale design and testing of an improved fine coal dewatering system applied through the top third of the thickness of the filter cake will be sufficient to obtain the additional decrease in moisture content of the coal.

  • 22 dec 2011 FINAL DISSERTATION WCC dissertation

    The aim of this research project was to test the response of ultra fine coal sourced at Klipspruit Colliery to froth flotation and the response of the froth flotation products to dewatering using two different types of filter presses, namely the Tecnicas Hidraulicas (TH) and

  • New coal dewatering technology turns sludge to powder

    New coal dewatering technology turns sludge to powder. February 9, 2009. Roe-Hoan Yoon. Because there has been no economically viable technology to remove water from ultrafine coal slurries, the ultrafine particles that are the residue of the coal cleaning process have been discarded into hundreds of impoundments. Now, Peter Bethell of Arch

  • Development of the screen bowl centrifuge for dewatering

    As part of a study being conducted for the Electric Power Research Institute's (EPRI's) Upgraded Coal Interest Group (UCIG) to evaluate ultrafine coal dewatering technologies, testing was carried out to investigate the use of a solid-bowl (high-g) centrifuge for thickening ultrafine coalwater slurries.

  • Pilot scale single stage fine coal dewatering and

    The primary goal of the ongoing ICCI coal preparation research project is to reduce ash and sulfur content in coal by using fine grinding and other coal cleaning processes. The ultrafine coal particles that result from the grinding and cleaning operations are difficult to dewater, and create problems in their storage, handling and transportation. The objective of this research is to combine

  • Development of an Ultra-fine Coal Dewatering Technology

    In many coal preparation plants, the fine waste stream is fed into a series of selection processes where fine coal particles are recovered from the mixture to form diluted coal fine slurries. A dewatering process is then needed to reduce the water content to about 15%-20% so that the product is marketable.

  • Enhanced ultrafine coal dewatering using flocculation

    Feb 01, 2000· Ultrafine coal (−150 μm) can be effectively cleaned using advanced separation techniques such as column flotation, however, dewatering it to below 20 percent moisture level using the conventional dewatering techniques is difficult. A comparative flocculation filtration study was performed for enhancing dewatering of ultrafine coal using vacuum, hyperbaric, and centrifugal filters. The