antimony - Sciencemadness.org

110 THE METALLURGY OF ANTIMONY.
furnace is kept continuously in blast for three weeks, and smelts
about 19 tons of material daily.
Sb
Fe
S
Fe2O3
SiOa
A12O3
CaCO8
CaO
bb2b3 QVi CJ
FeS
Na2S
C
Dressed Ores.
Raw.
43-3
14'4
25*3
117
0-3
3 3
Calcined.
48'9
...
0-7
23*4
23-3
4-0
...
1-0
"*
...
Oxidised
Ores.
46*4
8'6
2*4
26*6
...
7*0
. ...
• 4 •
Raw.
21-4
129
15*1
41 : 6
0-5
40
4-0
...
Liquation
Residues.
Calcined.
23*1
2*-4
17*3
49-2
2*4
0 : 7
Flue
Dust.
56*1
6
10 9
•8
The smelting mixtures are of two kinds:—
Kilos.
Calcined dressed ores
A.
550
B.
600
Calcined liquation-residues . . . . 750 600
Ores balled with lime 200
Flue dust balled with lime . . . .100
Raw ore 100
Oxidised ore 100
Raw liquation-residues 100
Limestone . . . . . . . . 600 800
Foul furnace-slags 400 400
Refining slags 200
Crude Sb, Metal No. Ill 100
5*0
Refining
Slag.
25-7
5-9
2-4
53*4
9*0
The most favourable result is obtained when these mixtures are
used alternately, two charges of A being followed by one of B.
Lime, about 10 per cent., is used to ball up part of the washed ore
to a compact mass, and 7 per cent, lime is used for the same purpose
for the flue dust. This is only necessary at the beginning, for it
is found that after eight days' blowing these stuffs can be charged as
powders without interfering with the working of the furnace.
The products are unrefined metallic antimony, slag, and flue dust.
The antimony is divided into three classes:—
I. II. III.
Sb . 90-02 73-80 65*04
Fe . 6-23 16-66 2S"80
S 2'85 8-42 10-46