Navigation Links
Commercial-scale test of new technology to recover coal from sludge successful

A new technology for removing water from ultrafine coal slurry has been successfully tested at the commercial scale at an operating coal cleaning plant. The technology offers the possibility of reducing the coal slurry impoundment problem from the source. A peer-reviewed paper on this new technology was presented Sept. 15 at the 13th Australian Coal Preparation Society Conference, Cairns, Queensland.

Cleaning coal after it has been mined is done with water. The bulk of the coal mined is relatively coarse in size and, therefore, can be readily washed of impurities and subsequently dewatered. However, a portion of mined coal is smaller than approximately 30-40 microns something like the size of talcum powder and is difficult to dewater after cleaning, said Roe-Hoan Yoon, the Nicholas T. Camicia Professor of Mining and Mineral Engineering in Virginia Tech's College of Engineering. As a result, finer coal is often discarded to slurry impoundments. There are hundreds of sludge impoundments in the U.S., mostly in Appalachia, creating environmental and safety concerns, said Yoon.

Yoon presented the paper in Australia with co-author Wally Schultz, executive vice president of Decanter Machine Inc. of Johnson City, Tenn., the largest supplier of screen-bowl centrifuges internationally.

Yoon, Gerald Luttrell, Massey Professor of Mining and Mineral Engineering, and their colleagues at the Center for Advanced Separation Technologies (CAST) at Virginia Tech have developed a hyperbaric centrifuge that was patented by Virginia Tech Intellectual Properties Inc. and sublicensed to Decanter Machine. "The new technology compliments what Decanter already has," said Yoon.

Encouraged by the results of a pilot-scale test conducted in 2009, Jim Walter Resources Inc. of Brookwood, Ala. (Walter Energy) tested a full-scale commercial unit successfully. "Everything has performed as promised by Decanter," said Joel Franklin, preparation engineer for Jim Walter Resources.

In the pilot-scale test, coal slurries consisting of ultrafine coal were dewatered to less than 20 percent moisture. "The product coal feels like dry powder when you touch it because the water left with the coal is spread so thinly across its large surface area," Luttrell said.

According to a National Research Council report, the U.S. coal industry discards annually 70 to 90 million tons of fine refuse to slurry impoundments. "The dewatering technologies developed by CAST will help coal companies recover all of the mined coal. The technology can also be used to recover the coal in existing impoundments, which can help clean-up the environment and create jobs in the coal producing regions like Southwest Virginia," said Congressman Rick Boucher (D-VA 9th District), who has supported funding for CAST and other energy projects.

"We are very optimistic," said Decanter Machine Inc. President Ken Robinette.

The centrifuge technology is the most recent of the advanced technologies developed by CAST. Microcel flotation column was the first major separation technology developed. It uses microbubbles to separate fine coal from mineral matter that becomes ash when burned at power plants and from other impurities, and is used widely in Australia.

As part of a project funded by National Energy Technology Laboratory (NETL), CAST has developed two other advanced dewatering processes. 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.

In June 2010, Yoon testified before the subcommittee of the West Virginia Legislature's Joint Standing Committee that was charged with addressing the issues concerning coal slurry impoundments. Yoon suggested that the CAST research funded by NETL can offer technological solutions.


Contact: Susan Trulove
Virginia Tech

Related biology technology :

1. Enerkem announces first commercial-scale biofuels and biochemicals plant is entering start-up phase
2. Weikang Bio-Technology Issues 2010 and 2011 Fiscal Year Guidance
3. Genomas Awarded US Patent for its PhyzioGenomics Platform Technology to Predict Treatment Responses
4. Champions Biotechnology Reports Fiscal 2011 First Quarter Financial Results
5. Huifeng Bio-Pharmaceutical Technology, Inc. Announces the Acquisition of Shangqiu Kexin Rutin Processing Ltd.
6. Roche Diabetes Care and ICW Announce Technology Partnership
7. Reportlinker Adds Biotechnology Pharmaceutical Market in US -2013
8. Weikang Bio-Technology to Present at Rodman and Renshaws Annual Global Investment Conference on September 14th 2010
9. Fibrocell Science, Inc. Names Biotechnology and Genetic Research Expert Stefan Gruenwald, M.D., Ph.D., to Scientific Advisory Board
10. Honeywell UOP Technology Selected to Support Conversion of Biomass to Fuel at California Renewable Energy Facility
11. Ion Torrent Selected as World Economic Forum Technology Pioneer
Post Your Comments:
(Date:6/27/2016)... ... June 27, 2016 , ... Parallel 6 , the ... today the Clinical Reach Virtual Patient Encounter CONSULT module which enables both ... physician and clinical trial team. , Using the CONSULT module, patients and physicians can ...
(Date:6/27/2016)... 27, 2016  Liquid Biotech USA ... of a Sponsored Research Agreement with The University ... (CTCs) from cancer patients.  The funding will be ... correlate with clinical outcomes in cancer patients undergoing ... then be employed to support the design of ...
(Date:6/24/2016)... , June 24, 2016 Epic Sciences ... detects cancers susceptible to PARP inhibitors by targeting ... cells (CTCs). The new test has already been ... in multiple cancer types. Over 230 ... damage response pathways, including PARP, ATM, ATR, DNA-PK ...
(Date:6/23/2016)... ... 23, 2016 , ... Mosio, a leader in clinical research ... Recruitment and Retention Tips.” Partnering with experienced clinical research professionals, Mosio revisits the ... tools, and strategies for clinical researchers. , “The landscape of how patients receive ...
Breaking Biology Technology:
(Date:6/20/2016)... Securus Technologies, a leading provider of ... safety, investigation, corrections and monitoring announced that after ... secured the final acceptance by all three (3) ... Systems (MAS) installed. Furthermore, Securus will have contracts ... by October, 2016. MAS distinguishes between legitimate wireless ...
(Date:6/7/2016)... 7, 2016  Syngrafii Inc. and San Antonio ... that includes integrating Syngrafii,s patented LongPen™ eSignature "Wet" ... collaboration will result in greater convenience for SACU ... while maintaining existing document workflow and compliance requirements. ... Highlights: ...
(Date:6/1/2016)... -- Favorable Government Initiatives Coupled With Implementation ... to Boost Global Biometrics System Market Through 2021  ... " Global Biometrics Market By Type, By End ... - 2021", the global biometrics market is projected to ... growing security concerns across various end use sectors such ...
Breaking Biology News(10 mins):