Evaporation crystallization of sodium sulfate aqueous solution
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When a 10%-20% sodium sulfate aqueous solution is evaporated and crystallized, passed through a concentration tank, and then separated by centrifugation, does the resulting product contain crystal water? Which centrifuge is suitable?
Different temperatures and different processes can yield products with varying numbers of crystal waters. Sodium sulfate is also difficult to sell; it would be better to consider electrolyzing it into liquid caustic and dilute sulfuric acid for reuse.
What is the cost of electrolyzing sodium sulfate into liquid alkali and dilute sulfuric acid?
It’s about using three-effect evaporation at eighty or ninety degrees. Come out, pass it through the concentration tank, and then go straight to the centrifuge. I’m not sure if what is obtained through this centrifugation is anhydrous sodium sulfate This is a by-product; we don’t plan to sell it for much money – as long as someone will buy it, that’s fine.
As long as it is wet and has not been dried at high temperatures, its molecules must contain crystal water. So, it cannot be said to be anhydrous.
Pay attention to the phase diagram; what is produced at this stage is anhydrous sodium sulfate, which contains no crystalline water
This translates to 3,500–4,500 kWh of electricity consumed per ton of solid alkali
It’s also quite cost-effective, as the price of solid bases is not low these days.
Sodium sulfate is difficult to handle, and there is a low demand for it.
It’s true to say that we should forget each other in the world. Look at the fortune chart.