Process: A process for the beneficiation of high ash coal.

Uses: For metallurgical use (coking), for direct reduction of iron ore, coal dust injection in blast furnace (non-coking).

Salient Features: The process is based on crushing, grinding and flotation of raw coal. Depending on the coal characteristics, a clean coal of 12% ash with 40-50% yield, 17% ash with 50-75% yield has been obtained for coking coal. For non-coking coal concentrates of 10-12% ash 40-65% yield have been obtained from a feed of 22.5-30% ash.

Environmental Considerations: Does not need any special attention.

Scale of Development: The process has been developed on 20 tpd scale.

Commercialisation Status: Washing plants at Jamadoba, West Bokaro, Dugda, Gidi, based on NML flowsheet for coking coal floation plant.

Major Raw Materials: Raw coal, Kerosene, Diesel oil, Pine Oil, Sodium silicate.

Major Plant Equipment/Machinery: Crushers, Grinders, Floation banks, Conditioners, Thickeners, Filters, Conveying equipments, Pumps.

Techno-Economics: A 100 tpd plant will cost Rs. 640 lakhs.

Technology Package:
(i) Process know-how
(ii) technological flowsheet and material, water balance equipment sizing and selection consultancy
(iii) Advice and assistant on plant set up and commisioning on separate terms.

Released Through: NML/CSIR

Contact:
Director
National Metallurgical Laboratory
Jamshedpur - 831007, India