| 摘要 |
<p>The present invention pertains to the field of carbon-graphite materials and essentially relates to the production of thermally expanded graphite which is mainly used as a sorbant as well as in the production of graphite foils, heat- and fire-resistant coatings, gaskets, etc. The method for producing thermally expanded graphite involves dosing a powder of oxidised graphite, forming a dual-phase flow of powder particles in a gas, feeding said flow into the thermal-shock area of a tubular heater at a temperature of between 950 and 1400 ° C, removing the expanded graphite from the heater and cooling the same. The tubular heater is arranged vertically, while the dual-phase flow is supplied into said tubular heater from the bottom at a speed at least equal to the airborne speed of the particles of oxidised graphite. The expanded graphite is cooled as it is removed from the heater through an inclined or horizontal tube. The volumetric ratio between the powder and the gas, during the dosage and the formation of the dual-phase flow, ranges preferably from 1: 750 to 1: 1400. The minimal residence time of the particles in the tubular heater varies between 0.1 and 0.4 seconds.</p> |
