How to treat alumina wastewater?

Alumina will produce wastewater during its production and processing, which requires us to do a good job of treatment. Otherwise, the discharge of substandard wastewater will cause environmental pollution. Let's teach you how to treat wastewater.

1. Adopt advanced clean production technology, adopt all indirect heating processes for pressure cooking and dissolution processes, adopt countercurrent washing for red mud and alumina, and strictly control the amount of water entering the process system.

2. Alumina wastewater treatment adopts the technical measures of "clean and dirty diversion, one water for multiple uses". A circulating water system is set up for production water. The wastewater of the circulating water system is discharged into the production wastewater treatment station for treatment, and the treated water is returned to the process system for recycling.

3. The red mud attached liquid is used as raw material preparation water after clarification in the red mud yard. The alkaline solution in the process is recycled in the process to reduce alkali consumption and reduce wastewater discharge.

4. Collect the wastewater and send it to the washing tank. In the washing tank, the aluminum ions, alkali and acid in the water will be fully mixed. The mixed wastewater is discharged to the neutralization tank, and then the pH value is tested. If the pH value does not meet the requirements, it is necessary to add reagents for neutralization. For example, if the wastewater is acidic, NaOH needs to be added to neutralize it; on the contrary, if it is alkaline, CaO needs to be added to neutralize it.

The above is the wastewater treatment method of alumina. The treatment process is not complicated, but everyone should pay attention to the correct grasp of the method in the actual application situation, and treat the wastewater clean before discharging it, so as to achieve the purpose of protecting the environment. It is necessary to do a good job in wastewater treatment.