ck.] WASHING TESTS. <>7 
The chemical composition of the two grades of coal is .shown below: 
Analyse* showing effect of washing Illinois No. 8 coal. 
Raw coal for 
coking. 
3h.... 
ilphur 
10.59 
1.45 
Washed coal 
for coking. 
5. 86 
1.41 
Illinois No. 5. — No. 5 washed slack from mine No. 1, Donk Brothers 
oal and Coke Company, Collinsville, 111. 
The slack at this plant is washed and divided into five grades, and 
je sample consisted of No. 5, or the finest grade produced. The 
irticles of coal were all less than one-fourth inch in diameter. The 
al was washed at the mine, but owing to the overcrowded condition 
the washery this grade of coal carried a considerable amount of 
tpurities, mainly as a clay coating on the particles of coal. As the 
al did not coke in the condition received, a charge consisting of about 
ons was re washed in the New Century jig. The coal was extremely 
)t when charged, chilling the oven, and no coke was produced. 
though the coking test was not successful, the rewashing showed a 
>tinct gain in the quality of the coal, but considerable coal was lost 
the operation. Chemical analyses show the following results: 
Analyses showing effect of washing Illinois No. 5 coal. 
First charge 
washed. 
Second 
charge re- 
washed. 
Third charge 
washed. 
1 
17.56 
3.25 
9.18 
2.71 
18.16 
phur 
3.44 
r ndian Territory No #. — Run-of-mine coal from mine No. 8, Rock 
md Coal Company, Hartshorne, Ind. T. 
?ests were made on this coal in the raw state and also after wash- 
The unwashed charge (9,000 pounds) was burned for 66 hours, 
1 yielded 5,725 pounds of coke and 580 pounds of breeze and ash. 
coke was very soft, shattered, and brittle. The washed charge 
\ burned for 65 hours, producing a coke which had a fairly good 
It showed considerable improvement in appearance over the 
:Je made from unwashed coal. The change in the impurities is 
jjjwn by the following analyses. 
