How to treat high-concentration salt, acid, and phosphate wastewater?
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One of the company’s projects involves the use of phosphorus trichloride; the product must be cooled in ice water to separate the material from the phosphate wastewater (which contains salts and acids) Currently, the phosphate content is around 20–25%, while the salt content is about 5–10%; the production volume is around 20 tons per day! Drying with lime for direct emission is too costly, and distillation concentration poses a problem as phosphoric acid and salts cannot be separated from the acid! I heard that extractants can be used to separate salts, acids, and phosphoric acid. How is this done, and what exactly are these extractants?
Is there anyone who knows? :'(:'(:'(:'(:'(:'(:'(
Can by-products be produced, such as 【sodium triphosphate】?
Sodium salts of phosphoric acid contain large amounts of sodium chloride as well, so it seems not very easy to separate them! The boss is quite stingy and only cares about making money!
Membrane separation can be employed to recover salt acid and phosphoric acid, thereby avoiding the need to add lime for neutralization
It is said that TBP can be used, but its effectiveness isn’t very good; there’s still a long process to go before it can be utilized. I really can’t think of any other alternatives right now
Phosphoric acid is an acid with a relatively high molecular weight, while its salts have a lower molecular weight; concentration and impurity removal can be considered, followed by nanofiltration. It is advisable to consult manufacturers specializing in membranes for more details.
Trisodium phosphate can be produced; feel free to contact me if you need it, QQ: 734534624
This post was last edited by Wang Genrong on 2016-6-23 at 14:38. Evaporation and concentration can be carried out under negative pressure; the evaporated condensate is salt acid, while the remaining evaporated material is phosphoric acid (containing a small amount of salt acid).
Just two types of salts, which can be easily separated from each other; the benefits should be good
Mr. Wang, you are so amazing. You could think of such a method; I can only laugh