Hot press upgrading experiment of Baorixile lignite

Introduce the advantages of pneumatic drying techniques,carry out the hot press upgrading experiments of Baorixile lignite with hot press upgrading(HPU) testing line.The coal sample thermal analysis indicates that the proper drying temperature for Baorixile lignite is between 105 ℃and 371 ℃.The influence of drying temperature,feeding frequency on moisture of upgrading coal fines which directly affects the quality of briquette show that the moisture of upgrading coal fines decreases with the increase of drying temperature,increases with the increase of feeding frequency.The proper drying temperature for Baorixile lignite is between 220 ℃ and 320 ℃,feed frequency is between 30 Hz and 50 Hz.The suitable moisture for upgrading coal ranges from 5 percent to 13 percent,the optimum moisture for upgrading coal fines ranges from 5 percent to 8 percent.When all the variables are in the appropriate ranges,unconfined compressive strength is up to 900 Newton per one,falling strength is over 80 percent.Therefore,it is feasible that dewatering and drying Baorixile lignite using the pneumatic drying technique as the flue gas drying medium.The results provide the basis for expanding the processing and utilization pathway of the Baorixile lignite,serving as a reference for other regions.