Method for separating arsenic and heavy metals in an acidic washing solution

摘要

A method for separating arsenic and heavy metals in an acidic washing solution which contains both arsenic and heavy metal, more particularly in a washing solution which is formed in copper smelting and contains sulphuric acid, comprises a separation process section, in which arsenic and at least one primary heavy metal are separated from one another. The separation process section comprises a processing step, in which hydrogen peroxide H2O2 is added to the washing solution, and the separation process section comprises a precipitation stage, in which the washing solution is admixed with a sulphide precipitation reagent, causing the at least one primary heavy metal to precipitate in the form of a metal sulphide. The processing step in this system is carried out before the precipitation stage.

主权项

1. A method for separating arsenic and heavy metals in an acidic washing solution containing both arsenic and heavy metals, the method comprising:
a separation stage in which arsenic and at least one primary heavy metal are separated from each other, wherein a) the separation stage comprises a processing step in which hydrogen peroxide is added to the washing solution; and b) the separation stage comprises a precipitation step in which a sulfide precipitating reagent is added to the washing solution in order to precipitate the at least one primary heavy metal as metal sulfide, wherein the result of the precipitation step is the metal sulfide and washing solution containing arsenic, c) the processing step being carried out before the precipitation step.