With this rule a cloud tin production process, dispersed in acetic arsenic, tin, and methyl tin hard head. The slag precipitated by ethylene tin, the hard head after the melting, and the condensate slag (pot residue) refined by the tin-tin fire method are all high in arsenic (see table ); in order to recover the tin and lead , the arsenic must be calcined first. . The calcined soot is enriched with arsenic (see table ) and is purified by electrothermal rotary kiln to be 95% to 99.5% white arsenic series products. The main equipment and technical conditions for the production of white arsenic by Yunxi Yiye are as follows: Â The materials of arsenic roasting and the content of soot produced by the rotary tin smelting
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Main equipment electric heating rotary kiln       ¢ 80 0 × 8000, 1 set, motor power 189 kW
Disc feeder       ¢ 1200 , 2 sets
   1 to 5 series condenser  Â
Calcination temperature         40 0 ～
Kiln speed             0.2 5 ~ 0.29 r / min ,
Feed amount           0. 9 ~ 2.0 t / h ,
Roasting slag containing arsenic       1.2 % to 4.0 %
Electric rotary kiln temperature   70 0 ～
pressure             — 2 0 ～— 40 Pa,
Kiln speed             1 to 2 r/min,
   Reduction with coal       0.5 % to 1%
Example of direct smelting process of Yunxi Yiye tin concentrate without pre-baking
Calcined in the kiln
Material name
Material component / %
Sn
Pb
Zn
Cu
As
Sb
S
Fe
Ethylene tin slag
Hard head after melting
Arsenic slag
35~38
28~32
18~20
3~5
3~5
1~2
0.6~0.8
0.6~0.8
0.1~0.3
0.2~0.5
0.2~0.5
0.3~0.6
12~14
9~11
20~30
0.01~0.04
0.01~0.02
0.01~0.05
3~4
3~8
0.3~0.5
30~32
32~36
Produced soot category
Smoke component / %
As 2 O 3
Sn
Pb
Cu
Sb
S
FeO
Al 2 O 3
Settlement dust
Cyclone dust
Electric dust collection
60~75
75~85
55~75
10~25
6~12
8~12
2~3
1~2
1~2
<0.4
<0.5
<0.4
<0.07
<0.05
<0.06
<0.25
<0.2
<0.2
<0.12
<0.09
<0.09
<0.06
<0.05
<0.05