| 摘要 |
A heat-coalescible graphitic aggregate for making graphite molds, graphite fuel elements or moderating elements for nuclear reactors, and so on, is made by first forming a suspension of carbon particles in an alkaline solution of phenolformaldehyde. The suspension is then mixed together with acidulated water, the latter being heated to 40 DEG to 70 DEG C. to accelerate the reaction, with violent mixing, as in a jet device, causing a skin of insoluble phenolformaldehyde to be applied as a coating to each of the particles in suspension, which particles readily settle out and are soon separated by decanting and filtration, after which the composite solid is dried and the aqueous liquid is neutralized before being discarded. |
