Many industrial chemical applications involve mixing to create a different product, for wastewater treatment purposes, or to dilute the chemical. Polyethylene tanks are well-equipped to handle that type of process, as the chemicals being mixed can be safely combined. Traditionally, the mixing would be achieved with a large mechanism that looks similar to a hand mixer. Let’s take a look at how mixing in tanks works, and another method that might be better.
Mixing With Mixers
When mixing chemicals with a mixor agitator, the mechanism has to be supported by a bracketing system or attachment that is compatible with the storage tank. This can cause complications in terms of space (often the mixing brackets are large and take up a lot of space), chemical compatibility with metal (the mixing arm itself is often made of metal), and cost (the mixer and corresponding bracket or attachment can be expensive). There is an alternative to traditional mixing, however, and it can help you avoid all of these complications.
About Pump Mixing
Mixing chemicals without a mixer involves using a strategically placed pump(s) to mix the chemicals inside the tank. In general terms, consider mixing a powdered drink into a pitcher. Adding the powder to the water starts the mixture, since the powder dissolves. If you take a spoon and stir it into the pitcher (traditional mixer), all the powder will eventually mix in. Alternatively, If you poured that pitcher back and forth to another pitcher, the water and the drink mixture would also form.
Pump mixing works in a similar way. The liquid in the tank is mixed with an application-appropriate pump which is plumbed to the tank in a way to achieve a satisfactory combination of vertical and lateral flows. In-tank mixing draws the fluid out of the tank (generally at the bottom to pump suction), and adds it back in via a nozzle on the dome.
This nozzle, called an in-tank eductor, utilizes principles of fluid dynamics to pressurize the fluid, and the combined stream gives you a high-velocity flow that creates agitation, and thus the mixing of the tank contents. In some cases, mixing can occur with a pump discharge fitting only. Many pump experts, some of which even represent products called circulating tank eductors & tank liquid agitators, can assist you in proper sizing. This is often a great alternative to your tank having mixer equipment, but rather just fittings to accept the pump mixing system.
In-Tank Mixing Correctly
As in any chemical storage application, it all comes down to the chemicals you are using. The location, placement of the eductor and pump, their level, and angle are all placed according to the application.
A chemical storage expert can help you choose the right locations and fittings for this process.