A METHOD FOR DECOLOURING SULPHURIC ACID DERIVED FROM ACID PRODUCTION PROCESSES

摘要

The present invention relates to a method for decolouring sulphuric acid produced in accordance with the contact method, comprising one or more absorption circuits. The produced sulphuric acid is decoloured by adding hydrogen peroxide to the system. The method is characterized by adding the hydrogen peroxide to the sulphuric acid in the final absorption circuit, and by maintaining the temperature in this circuit above about 70 DEG C.