Process for making a starting material for the manufacture of ar

Details Process for making a starting material for the manufacture of ar Process for making a starting material for the manufacture of ar

1979-12-18

1982-02-09

Silverberg, Sam

Metal founding

Process

Shaping a forming surface

260 38, 427221, 164527, C08G 5124, C09D 502

Patent

active

043145990

ABSTRACT:
A heat-coalescible graphitic aggregate for making graphite molds, graphite uel 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.degree. to 70.degree. 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.

REFERENCES:
patent: 2655490 (1953-10-01), Sonnabend
patent: 3031344 (1962-08-01), Sher
patent: 3644269 (1972-02-01), Horyt
patent: 3709849 (1973-01-01), Tenon
patent: 3932568 (1976-01-01), Watts
patent: 4009143 (1971-02-01), Luhleich

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