Coal and Iron Ores

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The natural resources for high quality coking coal are fast depleting. In addition, the steel industries require lower levels of ash in the feed coal to enhance their productivity.


Development of technology for treating poorer quality coking coals to achieve relatively lower ash product

The response of the coal in various unit operations in crushing, grinding, gravity separation and flotation are examined, process optimized and a flow sheet developed for coal cleaning. Studies are taken up for non-coking coal too. Removal of ash forming material and bringing the ash level down to a specified level to suit the requirements of the thermal power plants is the key issue in these studies.

Beneficiation of iron ores

A combination of gravity and magnetic separation along with froth flotation are the unit operations used in these studies. A large number of gravity separation techniques starting from flowing film concentration to enhanced gravity separations in centrifugal force fields are examined regularly to develop a feasible flow sheet for iron ore beneficiation. Agglomeration studies including brequetting, sintering and pelletization are also routinely taken us in this program.  

Major Achievements

Nearly 250 studies on iron ore beneficiation has been completed at NML

Over 50 investigations on different coals have been carried and flow sheets developed

Many iron ore processing plants in India are running presently with technical know-how developed by NML

Our knowhow on clean coal technology has benefited many coal preparation plants


Major Facilities

Bench and pilot scale equipment for carrying out planned research on beneficiation and agglomeration of coal and iron ores. Some typical laboratory/ pilot scale facilities  include  Wilfley table, Spiral concentrator, Water only cyclone, Floatex density separator, Mechanical &  Column Flotation Cells, Centrifugal/Enhanced gravity separators, Dry and Wet High Intensity Magnetic Separators, Iron Ore Washing Plant and Agglomeration facilities covering Brequetting, Sintering and Pelletization


Facilities Available
National Metallurgical Laboratory
Jamshedpur-831007 | Tel: +91-657-2345000-001, 2345028, 2345205 | Fax: 91-6572345213, 2345153 , E-Mail:

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