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The bulk density of needle coke, which has been recognized as the essential filler of the electrode for the steel industry is expected as high as possible in addition to the needle-like anisotropy better performance. The effects of preheat-treatment on the bulk density of semi-cokes produced from A240, (petroleum pitch), CTP-ASM (QI free coal tar pitch) SHAS (Sumatra heavy asphalt) and S-oil (residue from FCC process) were examined in the present study.<BR>The bulk density of the semi-coke produced from A240 without preheat-treatment was as low as 0.21g/cm<SUP>3</SUP>, very thin pore walls with many pores being observable in semi-coke. The preheat-treatment for more than 36h at 450° without refluxing markedly increased the bulk density up to 0.80g/cm<SUP>3</SUP>, although a preheat-treatment at a higher temperature of 480°C for 12h resulted in 0.40g/cm<SUP>3</SUP>. The pitch had solidified at the end of the heat-treatment. Refluxing treatment further increased the bulk density the treatment at 520°C, which was much higher than that of non-refluxing conditions, gave a bulk density up to 1.20g/cm<SUP>3</SUP>.<BR>The bulk density of the semi-coke from CTP-ASM of high fa value increased from 0.30g/cm<SUP>2</SUP> (without preheat-treatment) to 1.20g/cm<SUP>2</SUP> after the preheat-treatment at 480°C for 6h under refluxing. SHAS of low fa value and high molecular weight, which produced flaky cokes without preheat-treatment, also provided a bulky coke afrer the preheat-treatment at 420°C, whereas the treatment at 480°C resulted in the flaky cokes since the carbonization leading to the solidification took already place during the treatment. The refluxing treatment against SHAS failed to increase the bulk density. Refluxing materials of SHAS may segregate the carbonizing material of high aromatisity as an anti-solvent resulting in the rapid increase of viscosity of the latter phase.<BR>The preheat-treatment was also effective to increase the size of optical texture although the conditions of preheat-treatment to achieve the largest sizes of optical texture were not always same to those to obtain the highest bulk density.<BR>The preheat-treatment conditions suitable to increase the bulk density appear very sensitive to the structure of starting materials. The key structural factors modified by the preheat-treatment were discussed in relation to the carbonization mech-anism, which may determine the bulk density and optical anisotropy of the semi-coke.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
- Modifying Optical Texture of the Coke from Miike Coal
- Development of Petrochemical Industry with the Background of Iron Manufacturing Industry
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