Treatment of waste water from production of silica

As we all know, as long as it is an industrial production, it will definitely produce waste and pollute the environment.And the production of silica is no exception, because the production of silica wastewater is very strong pollution, so in the production of silica process must pay attention to the treatment of wastewater, through what method to treat the wastewater?Because the production method is different, the processing method is also different.

1, the production of precipitated silica by sulfuric acid method, the main wastewater contains sodium sulfate.Treatment method: firstly, the slurry produced by precipitation reaction is pressed and filtered out the mother liquor containing high sodium sulfate, which can be made into sodium sulfate powder by gypsum plant or self-recovery. Then, the filter cake is washed with clean water, so that the wastewater containing acid is concentrated together. Then, the alkaline wastewater in the production of sodium silicate is used for neutralization.

2. Silica produced by hydrochloric acid method, the main wastewater contains sodium chloride.Treatment method: firstly recycle the mother liquor rich in sodium chloride and make it into sour brine for reuse. Then wash the filter cake with clean water until it reaches the discharge standard.