Arsenic Sulfide → Sulfuric Acid

HRID 485614

Reaction equation

HRID 485614 reaction equation
[As].[OH:2][O:3][S:4]([OH:7])(=[O:6])=[O:5].[S-2].[S-2].[S-2].[As+3].[As+3]>[Au].O>[OH:2][O:3][S:4]([OH:7])(=[O:6])=[O:5].[S:4](=[O:5])(=[O:3])([OH:7])[OH:6].[OH:2][OH:3]

Participants

8

Reactant 3

HCID 61569Arsenic SulfideHCID 2754594Peroxymonosulfuric acid2×HCID 5359596Arsenic

Product 3

HCID 784Hydrogen PeroxideYield 50%HCID 1118Sulfuric AcidYield 92%HCID 2754594Peroxymonosulfuric acid

Reagents, catalysts & solvents 2

HCID 23985GoldCatalystHCID 962WaterSolvent

Procedure

In the process of the invention, the arsenic-containing gold ore is treated with Caro's acid, i.e. peroxymonosulphuric acid (H2SO5), to oxidize the arsenic sulfide in the ore to the water soluble arsenate form. Caro's acid is produced by reaction between 92 to 99% sulphuric acid and 50 to 75% aqueous hydrogen peroxide in a mole ratio of 1.5:1 to 3.5:1. The acid may be diluted with water for use in this invention, and usually has a concentration in the range of about 15 to about 30%.

Sources & evidence

ORD record
ord-2a9f6d28f9a844d0a72a9441af6bc2b0
Source dataset
uspto-grants-1985_08
Patent number
US04537628

Linked notes

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