WICK. J 
WASHING TESTS. 
61 
SPECIAL TESTS. 
Complete washing tests were made upon the samples named below, 
and with the results stated. 
ILLINOIS NO. 2. 
This sample consisted of a carload of slack from the O'Fallon mine 
of the Western Anthracite Coal and Coke Company, near O'Fallon, 
111. The coal in this district produces considerable slack, which finds 
i fairly ready market in St. Louis, but the price received is hardly 
sufficient to pay for transportation. Washing has been introduced at 
i number of plants to improve the quality of the slack, with very 
promising results, and this test was made with the object of showing 
what improvement could be effected in this particular part of the dis- 
trict. The slack washed consisted of 27,280 pounds, which was care- 
fully sampled before and after washing. 
This coal was washed in the modified Stewart jig. The weight of 
the washed coal was not ascertained, but the refuse weighed 3,520 
pounds. 
The first column of the appended table shows the composition of the 
'aw coal as far as its content of moisture, ash, and sulphur is con- 
cerned. The second column gives the same data for the washed coal 
md the third column for the refuse. 
Analyses of Illinois No. 2 coal and refuse, showing effect of washing. 
Moisture 
ish 
?ulphur 
height, in pounds. 
Raw coal. Washedcoal. Kefu 
12.03 
22.44 
4.00 
27, 280 
19. 07 
9.42 
3.35 
15.99 
53. 08 
9.06 
3, 520 
j A comparison of these figures shows that the percentage of ash was 
^educed from 22.44 to about 9.42 by washing, but the greater amount 
a kf moisture in the washedcoal sample makes direct comparison impos- 
sible. If the analysis of the washed coal had been determined on the 
, ( ame basis as that of the raw coal, the percentage of ash in the latter 
j^ould be about 10 per cent. This shows a reduction of fully 12 per 
I ent in ash as a result of washing a small lot through the Stewart 
tfig, but washing on a commercial scale might improve this result 
onsiderably. 
The sulphur shows a slight reduction, about one-half of 1 per cent, 
t would seem from these figures either that the major portion of the 
ulphur is so intimately combined with the coal as to be inseparable 
rom it, or that the sulphur is present in thin flakes which pass over 
nth the coaL 
