Is there a technology for treating magnesium wastewater containing 1% nitric acid?
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Is there any technology that allows magnesium wastewater containing about 1% nitric acid to be treated through membrane separation/electrodialysis to produce 40% dilute nitric acid, with the HNO3 content in the resulting wastewater being below 100 mg/L? It is estimated that many nitric acid plants need this technology.
If such a technology exists, it would represent a major breakthrough in magnesium nitrate production; please provide a detailed introduction, OP
2L: I’ve encountered this problem as well, which led me to come up with this idea; I hope that some company (such one involved in membrane technology or electrodialysis) can solve this issue.
Nitric acid has extremely strong acidity and oxidizing power; I’m afraid no membrane will be suitable.
It is estimated that this idea cannot be realized, as nitric acid can mix with water in any proportion.
Membrane separation/electrodialysis is not feasible for now.
By adding another distillation tower to use the steam from the top of the magnesium nitrate evaporator as secondary steam for distillation and concentration, nitric acid concentrations of up to 20% can be achieved, with the nitric acid content in the top stream being less than 0.04%
What is the value of recovering 1% nitric acid through concentration? How many kilograms of acid are there in one ton? And how much does that cost? Is it meaningful?
It is mainly not for concentration recovery, but rather to reduce the concentration of acid emitted, as well as to decrease the amount of alkali needed for neutralizing the acid and to cut down on the costs associated with wastewater treatment
Currently, domestic manufacturers use two methods to treat acidic water: 1) distillation towers, and 2) devices that utilize dilute nitric acid. The second method is the simplest, but its drawback is that it tends to cause Cl- enrichment