Carbon solids were directly prepared from green petroleum coke powder without using any binder material.
Green petroleum coke powder was milled with a vibratory-ball-mill for various periods from30min to8hr in addition with water of8vol% and then pressed into a cylindrical shape with diameter of20mm under a pressure of2000kg/cm
2.The formed samples were heat-treated at 1000°C and then to final temperature at 2800°C.
Particle size decreased to about 1μm within4hr-milling.By milling for longer period, secondary aggregated particles with about10μm in maximum size were formed. The pulverized particles were not uniform in size and shape as was observed in the case of motar grinding.(002) diffraction peak of the green coke became broader after milling.
Some properties of the carbon solids thus obtained were investigated in relation to milling time and compared with the case of motar grinding.From the powder milled for1to4hr, carbon solids with bulk density of about1.9g/cm
3, d (002) spacing of3.39-3.40A, compressive strength of600-1000kg/cm
2 and shore hardness of about90were obtained.When milling time was prolonged more than1hr the strength decreased.The milling time of1hr to4hr was much shorter but the strength and the hardness were lower than the case of using agate mortar.
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