Utilization of colliery (washery) tailings. Final Report

COMMISSION OF THE EUROPEAN COMMUNITIES technical coal research Utilization of colliery (washery) tailings Blow-up from microfiche original EUR 6455Er COMMISSION OF THE EUROPEAN COMMUNITIES technical coal research Utilization of colliery (washery) tailings CRE, Stoke Orchard Contract No 7220-EC/811 FINAL REPORT Published by the Directorate-General Scientific and Technical Information and Information Management 1979 EUR 6455 Er LEGAL NOTICE Neither the Commission of the European Communities nor any person acting on behalf of then is responsible for the use which might be made of the following information NATIONAL COAL BOARD UTILISATION OF COLLIERY (WASHERY) TAILINGS FINAL REPORT on Research Project 7220-EC/811 to THE EUROPEAN COAL AND STEEL COMMUNITY Coal Research Establishment Stoke Orchard Cheltenham Gloucestershire December 1978 England UTILISATION OF COLLIERY (WASHERY) TAILINGS SUMMARY A process for the disposal of thickened colliery tailings using fluidised bed combustion has been developed. In the process, tailings from deep cone thickeners, which contain typically 65% mineral matter (dry basis), 24% coal (dry basis) and 45 to 55% water (as received) are sprayed onto the top of a fluidised bed operating at a superficial fluidising velocity of 1.2 m/s and a temperature of 800 C. The feedstock has a calorific value in the region of 7500 kJ/kg (as received) and generally more than half the solids are sized less than 45 μπι.