Process for producing coal fillers

Details Process for producing coal fillers Process for producing coal fillers

C - Chemistry, Metallurgy

09

C

6/215

C09C 1/48 (2006.01) C01B 31/02 (2006.01) C09C 1/44 (2006.01) C09C 1/58 (2006.01)

Patent

CA 1307877

51 ABSTRACT A process for producing coal fillers, which comprises the steps of: (a) carbonization step, which comprises carbonizing crushed coal particles having a particle size of not more than 10 mm and an ash content of not more than 10 % by weight by thermal decomposition at a temperature of 500 to 2,000 °C ; and cooling the carbonized solids; (b) ultrafine pulverization step, which comprises preparing a slurry of the carbonized solids having a solids content of 10 to 50 % by weight by adding a dispersion medium to the carbonized solids; and ultrafinely pulverizing the carbonized solids dispersed in the slurry to reduce the average particle size to not more than 5 µ m; (c) agglomeration step, which comprises adjusting the solids content of the slurry to 1 to 20 % by weight by further adding water to the slurry of the untrafinely pulverized solids; adding an oil having a boiling point of not more than 150 °C to the resulting slurry in a ratio of 30 to 300 parts by weight of the oil per 100 parts by weight of dry solids; agitating the resulting mixture to agglomerate the carbonaceous matters with oil; and separating and recovering the agglomerates; and 52 (d) drying step, which comprises drying the recovered agglomerates by heating them at 50 to 300 °C to evaporate the water and oil retained in the agglomerates; and cooling the dried agglomerates.

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