Material of the acid pump
Thread Content
Our sulfuric acid concentration fluctuates a bit; it’s usually above 92, so there’s definitely no problem with the acid pump. However, occasionally it drops to around 70. I would like to ask if the acid pump is capable of meeting the requirements? :handshake
I don’t understand! The acid concentration deviation is too large
It usually doesn’t get this low. I mean, in abnormal situations such as when the machine is parked, the concentration does go down; the main concern is whether the pump can handle it
When driving normally and the system load is stable, is there much variation in the flow rate of the dilution water?； If it is parked, is the acid system still in circulation? ； Is the manual valve for the dilution water closed tightly? ； Send it to the testing laboratory for an acid concentration comparison.
With an acid concentration of 70, the metal pump won’t work, but fluorocarbon-lined pumps are fine
When the acid concentration reaches 70%, its corrosivity becomes quite high, and this will definitely affect the service life of the acid pump. What intrigues me, however, is why the acid concentration can drop to 70% during startup and shutdown
When the acid concentration drops to 70%, it should be replaced promptly. Otherwise, it causes severe corrosion to the pump.
This mainly depends on the material of the acid pump chosen by your company. If it is a metal pump, caution is needed, as the corrosivity increases when the concentration of sulfuric acid decreases； If it is a fluorine-lined pump, then there will be no problem ； It is also best to choose acid pumps that are seal-free and do not cause any leakage, as concentrated sulfuric acid has water-absorbing properties. The acid that leaks from ordinary mechanically-sealed pumps will absorb water, turning into dilute sulfuric acid and increasing its corrosiveness.
A fluorine-lined magnetic pump should be chosen; however, it depends on the flow rate you need. Whether it’s an imported or domestic fluorine-lined magnetic pump, its maximum power output is 45 kW, with a flow rate of around 200 liters per minute – any higher than that isn’t possible. You need to check whether this is sufficient for your needs. Moreover, when handling sulfuric acid, it’s necessary to modify the impeller, otherwise the pump may experience overload. If you want to change it, mention a parameter and let everyone help choose.