Method for treating waste water from gold mines in order to obtain drinking water

摘要

The invention relates to a method for treating waste water from gold mines in order to obtain drinking water. The raw water is treated in such a way that raw materials can be recovered for technical use and the cleaned water is suitable for drinking. Most importantly, barium is used to precipitate the sulphate and the barium compounds are circulated. The method comprises the following steps: 1. precipitation of iron and manganese through the introduction of air and/or by raising the pH; 2. precipitation of the lime by adjusting the pH and or the carbonic acid balance; 3. removal of the sulphate with barium (barium sulphide/sulphate process or barium sulphate process) and re-treatment; and 4. purification (adsorption) of the residual substances.