A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

THE METALLURGY OF AXT1M0XY.
The prodticts of roasting (Sb2O3) are:—
1st condensing chamber .
2nd
3rd
4th
5th
6t-h
7th
8th
9th
5 J3
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76 kgs.
. . . 65 „
65 „
48 „
49 ,.
44 ,,
34 „
• • • 24 „
. . 19 ,,
Total = 424 kgs.
101
It should he noted that the cleaning of the chambers and pipes for
the removal of all the oxide was carried out in the next experiment.
(b) Second Experiment—The first charge in the second experiment
commenced at 11.5 a.m. on the 25th of April, and the last charge
stopped at 10.30 p.m. of the same day, thus giving a total of 11
hours 25 minutes working time. Each charge consisted of 50 kgs.
of ore mixed with 4 per cent, of charcoal. The total charges
amounted to 2725 kgs. of ore.
The products of roasting (Sbo03) are :—
1st condensing chamber .
2nd
3rd
,.
4th ,
5th
6th ,
7th ,
8th
9th ,
. 176 kgs.
103 .,
96 ,,
61 ,
45 „
38 ,
32 ,.
28 „
23 „
Total = 602 kes.
These numbers represent the actual amount of oxide extracted
from the ore, plus the cleanings of oxide, due in part to the first
experiment
Further cleaning of the pipes and chambers gave 32 kgs. The
condensing tanks, n, in fig. 4 of fig. 45, gave 1V8 kgs. of dried oxide.
Now, if all had been thoroughly cleaned up—the pipes, the condensing
chambers of the coke-tower, and the precipitating tanks—there would
have resulted at least 5 kgs. of oxide more.
(c) Conclusion.—The ore treated contained 19*5 per cent, of
antimony.
The oxide found in the first chamber contained 23 per cent, of
impurities.