In order to clarify.the behavior of antimony and arsenic in sulfuric acid solution, the system Sb
20
x (
x
: 3,
5
)-As
20
y (y: 3, 5)-SO
3-H
2O at 25°C was investigated by mixing method. Six antimony sulfates in the system SbO
3-SO
3-H
20, one arsenic sulfate in the system As
2O
3-SO
3-H
2O and one antimony arsenate and two antimony arsenate sulfates in the system Sb
2O
3-As
2O
5-SO
3-H
2O were identified. The solubility and stability ranges of those compounds, Sb
2O
3, Sb
2O
5and As
2O
3were determined. The solubility product of SbAsO
4was also determined to be 10
-6: 67. By using this value, the thermodynamic relationship for the system Sb (III)-As (V)-H
2O was established.
Only SbAs0
4is formed as antimony arsenic compound in sulfuric acid solution below 900 g/l H
2S0
4and will be one of the constituents of floating slime in electrorefining of copper.
In the production of arsenic trioxide by crystallization from sulfuric acid solution containing a large amount of antimony (III), the arsenic trioxide will be contaminated with antimony (III), because of the very low solubility of antimony (III) sulfatesf ormed.
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