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Waste Classiification

Posted on 30. Apr. 2003 - 06:53

Our company, Sortech, could help you to classify the waste dry powders as we did for example with a fly ash.

Cemex operating their first TriboClassifier

Adi Mogilevsky, Marketing Director

Jerusalem , Israel , April 8 2003 . Mexico-based multinational giant CEMEX S.A. de C.V., (NYSE: CX) ( ) and Israeli Jerusalem based company Sortech Separation Technologies Ltd. are working together to develop a fly ash beneficiation plant based on Sortech's unique dry powder separation technology - the TriboClassifier™. A laboratory scale machine is currently operational at Cemex headquarters in Monterrey, Mexico.

"This is a joint development to ramp up to a pilot plant construction," said Sortech CEO, Oren Elkayam, "and then we will move into a future discussion regarding the technology based industrial plant at Cemex's Bogot site."

Sortech representative Dr. Robert Asimow visited Cemex headquarters in Monterrey, Mexico on March 26 (see photos) to evaluate fly ash separation results achieved on Sortech's laboratory fly ash separator with 50kg/hour capacity.

There are two primary beneficiation criteria for fly ash: low unburned carbon content (Loss on Ignition, LOI) as well as high "fineness". According to the US and European standards for fly ash used in cement, LOI content should be less than 6% and no more than 34% of the particles should be larger than 45 microns. In practice, some concrete manufacturers and state regulations require a maximum of 3% LOI and maximum 8-12% coarse particles.

The Triboclassifier process separates the fine particles from the initial fly ash. These fine particles are of high value to the concrete industry as they are both highly reactive and low in LOI.

According to Dr. Asimow, Cemex production experts in Mexico and managers in Switzerland have recently conducted a videoconference during the visit and confirmed TriboClassifier's technology is a potential good match to the Cemex plant's processes, which are predominantly aimed at making raw materials for sale to a cement market. The high-volume fly ash concrete system provides a model for the future for making concrete mixtures that shrink less, crack less, and would be far more durable and resource-efficient than conventional Portland cement concrete.[1]

The fly ash separation is not the only application of Sortech. Markets including metal powders, pharmaceuticals and other dry powders separation applications are being investigated, said Elkayam.

About CEMEX:

CEMEX is a leading global producer and marketer of cement and ready-mix products, with operations primarily concentrated in the world's most dynamic cement markets across four continents. CEMEX combines a deep knowledge of the local markets with its global network and information technology systems to provide world-class products and services to its customers, from individual homebuilders to large industrial contractors. For more information, visit

About Sortech

Sortech Separation Technologies Ltd. is a Jerusalem based start up company founded in 1997.

The TriboClassifier™ developed and patented (USA # 6,439,394 B1 and # 6,095,965) by Sortech uses a new technology for dry bulk powder classification.

SorTech has developed a novel classification process based on triboclassification. The Triboclassifier™ utilized the principal that, if a particle is moving over a surface whose roughness is comparable to the particle size, the apparent coefficient of friction depends on particle size.

The TriboClassifier™ is suitable for bulk powder with mean particle sizes in the range of 10µm to 300µm.

The TriboClassifier™ process uses a rotating conical bowl. The surface roughness and rotational speed are adjusted to best suit the particular classification requirement.

The TriboClassifierTM is fully enclosed with a small footprint, has a very modest power requirement and can process powder at the rate of several kilograms to tons per hour.

The company’s experience, extensive research and development on a variety of materials having different separation objectives, shows that the Triboclassifer can provide the most efficient solution to many existing requirements. For more information, visit


[1] The following is based on an article entitled "REDUCING THE ENVIRONMENTAL IMPACT OF CONCRETE" By P. Kumar Mehta, a Professor Emeritus in the Civil Engineering Dept. at UC Berkley, as published in Concrete International (Vol. 23, No. 10, Oct. 2001).


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