•ratt.] BRIQUETTING TESTS. 1G7 
COKE BREEZE. 
In order to determine whether it was possible to use waste coke 
freeze, a series of experiments was made in the laboratory which 
showed that coke breeze could be briquetted so that it could be used 
is a substitute for lump coke. In order to make a practical test, a ton 
>f this mixture was made containing- 73 per cent of crushed coke, 20 
ler cent of West Virginia No. 6 coal, and 7 per cent of homemade 
Ditch Y. These materials were mixed thoroughly by hand and run 
through the English machine, both sides of the disintegrator being used, 
rhey were well pressed, and as delivered by the machine they were 
musually dry and had a brassy to bronze sheen on the surface, which 
ooked as though it might be due to an abrasion of the brass of the 
nolds. Upon testing this material, however, it was found to contain 
>nly the faintest possible trace of copper. The briquettes were hard 
md strong and easily handled while hot, but were somewhat dirty. 
)n cooling they became unusually tough and strong, and during com- 
bustion were very solid and burned more like anthracite than bituminous 
joal. Such a combination would make a good substitute for anthracite 
'oal. These briquettes weighed on an average 5.73 pounds each. 
The same mixture was run through the American machine, and the 
•esultant eggettes were dense, smooth, and polished, but not so tough 
is the corresponding briquettes. While warm they would stand a 
*reat deal of rough handling, but on cooling they became more brittle. 
Luis may be due to the crushing of the coke grains by the excessive 
pressure obtained in the American machine. 
The next test of coke breeze was made without the introduction of 
jry bituminous coal, and the mixture consisted of 92 per cent of coke 
>reeze and 8 per cent of pitch D. In passing this mixture through 
he English machine both sides of the disintegrator were run, a mini- 
iimi amount of steam was used, and a moderate pressure exerted. 
he resultant briquettes were clean, well formed, and when struck had 
metallic ring. They were very tough and strong, and would bear 
luch more handling than any of the briquettes made out of the coal. 
ney burned like ordinary coke, without any disintegration and with 
nly a little flame. These briquettes weighed on an average 5.92 
ounds each. The well-pressed briquettes had a specific gravity of 
025 and the porous briquettes had a specific gravity of 1.002. The 
rushing strength of the better briquettes was 30,100 pounds to the 
juare inch, while the porous briquettes had a crushing strength of 
2,100 pounds. In comparing the results of the crushing strength of 
lese coke briquettes with those made from coal, it will be seen that 
fen the porous briquettes had a much greater crushing strength than 
le best of the coal briquettes. 
