Regarding the mixing tee installed on the wet phosphoric acid extraction tank
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In many wet phosphoric acid production plants, a mixing tee is installed on the extraction tank, primarily to mix pantothenic acid with the sulfuric acid supplied to the system. What are the main advantages of doing this? Also, whether the lower pipe of the mixed tee is inserted below the liquid level.
The main purpose is to prevent sulfuric acid from reacting directly with the phosphate ore slurry, as the reaction occurs very rapidly; this prevents the formation of a \"covering\" on the surface of the ore particles, which would otherwise hinder further reactions in the phosphate ore and reduce the efficiency of the reaction. The tee must be inserted below the liquid level to facilitate thorough mixing and ensure even stirring, resulting in a balanced reaction.
I agree with the comment above; the first ones used by my company were imported, made of a plastic tube with a steel framework, and after they got damaged, they were replaced with 904L material tees, which also worked well.
So, what material should be used for pipes with mixed three-way connectors that are inserted below the liquid level?
Regarding this, there’s no need to be mysterious about it; a low extraction rate isn’t necessarily due to this factor.
The lower end of the tee should not go below the liquid level; there is also a spiral dispersing element at the bottom of the sulfuric acid pipe of the tee, and if it is inserted below the liquid level, it will not be able to ensure uniform mixing. Furthermore, if it is inserted directly below the liquid surface, it will cause the local sulfuric acid concentration to exceed the limit
In fact, the role of mixing with sulfuric acid is self-evident; as for whether to check below the liquid surface, this should be determined based on the design of the stirrer, and there is no one-size-fits-all solution. Under normal circumstances, whether in terms of dispersion or heat dissipation, it has a more positive effect on the surface of the liquid than below it; this is just my personal opinion for reference only.
For the one on the 6th floor, could you provide more details on this type of hybrid tee? Which manufacturers in the market offer the best performance with it? Thank you!
Also, the person who is familiar with this type of tee – could you please provide a detailed explanation of the spiral dispersing component located at the lower part of the tee?
Agree with the opinion from the second floor: it is necessary to prevent direct reaction between sulfuric acid and phosphate ore, as this can lead to local supersaturation, crystal encapsulation, and a decrease in the extraction rate.