In this text, we would like to brief introduce production and application of pitch coke. By optimizing the air flow rate, reaction pressure, reaction temperature and reaction time, as well as the thermal modification of air oxidation method, we produced the asphalt with a softened point of 285℃ from the medium temperature coal tar pitch. We carbonized the asphalt at 540 ℃ for 3 hours to produce coke. Then we calcined the coke at 1400℃ for 2h. Finally, we get the pitch coke with fine mosaic structure. The asphalt and raw asphalt were characterized by infrared spectroscopy, and the difference of functional groups in their molecules was discussed. The results of optical microscope and scanning electron microscope show that the microstructure of coke made from asphalt with different degree of oxidation and quality improvement is obviously different. When the air volume is 40 L/h and the pressure value is 0.5 MPa, the asphalt with high softening point can be carbonized and calcined at 330 ℃ for 8 h, and the pitch coke with mosaic structure unit ≤2μm can be obtained.

Because it is impossible to directly measure the temperature of combustion materials and lining in the pitch coke rotary kiln,** the steel plant cannot make a scientific judgment on the selection of combustion and lining materials in the furnace. We accurately judge the temperature field of rotary kiln by means of numerical simulation and field test. The maximum error between the calculated value and the test value is within 5%. The calculation results show that the calcined band is prone to damage at the position of 15~35m when the temperature in the furnace reaches 1800K.

Calcined coke has been the main filler in the baking process for a long time. However, we substitute calcined coke with pitch coke because of the requirement of cost reduction and production. Fillers play an irreplaceable role in anode roasting of aluminum. The filling material can transfer heat, provide a channel for the discharge of volatile, avoid oxidation of carbon block, and effectively fix the geometry of carbon block. In anode roasting of aluminum, the consumption of fillers is very large, so the cost should be strictly controlled.

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