Dilute sulfuric acid has a problem with crystal precipitation
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During the concentration of waste acid, it was observed that around 60% of the sulfuric acid forms crystals when the temperature is below 10°C. What could be the reason for this?
Apart from temperature, which is the most noticeable, the other factors are changes in concentration and pressure. For reference.
It depends on the results of your analysis to determine what components are present; once that is known, corresponding modifications can be made to the facilities. Otherwise, the concentration process results in a large number of valves and pipes, as well as high maintenance requirements.
About 60% of the sulfuric acid crystals should not precipitate. The analysis showed that there were sulfates present, but both iron and ferrous ions were at low levels; I’m not sure what type of sulfate it is, so I’m seeking advice from everyone!
When transporting fluids, it is necessary to allow for changes in their physical properties, as obstacles such as valves and elbows can cause variations in resistance or a throttling effect during transportation; phase changes may also occur, for reference.
Using the process of elimination, the salt that forms should not be blue; it’s not copper sulfate...:P
Or you can conduct a small test: concentrate it to over 75% and wait for it to cool and crystallize, then examine its appearance and perform color analysis
Consider this: dilute sulfuric acid contains arsenic, so direct analysis can be conducted on the dilute acid containing arsenic or on its crystalline forms.
For arsenic removal using sulfuric acid, turn to us; we have our own projects in operation – it might be sodium sulfate
How to remove sodium sulfate from sulfuric acid? Or, how are metal ions removed during the sulfuric acid concentration process?