Izdvajanje bora iz otpadnih voda postrojenja Kirka boraks
DOI:
https://doi.org/10.5937/ror1801021AKljučne reči:
Bor, Jalovišta, Precipitacija, Borna kiselinaApstrakt
Kirka Boron Inc. je najveće postrojenje za preradu i dobijanje bora u Turskoj, proizvodi 'tincal' (borax) iz rudnika i natrijum penta boraksa u istom kompleksu. Međutim, jalovište predstavlja značajan problem, jer aproksimativno 75 % zapremine postojećih bazena je ispunjeno otpadnom vodom koja sadrži 3 g/L bora. Udeo bora u ovoj vodi mora da se smanji kako bi se ona ponovno koristila u postrojenju. Pri tome koncentracija od 3 g/L bora predstavlja i rizik za životno okruženje. U ovom radu, bor iz vode koja se izliva iz Kirka Boron Inc. postrojenja je istaložen pomoću Ca(OH)2 i Al2SO4. Praćen je uticaj nekoliko parametara kao što su količina Ca(OH)2, polazna pH, vreme mešanja i vreme taloženja. Može se reći da koncentracija Ca2+ jona ima veliki uticaj na proces precipitacije i da je stepen precipitacije veći ukoliko polazna pH teži kiselim vrednostima. Istraživanja su pokazala da 97 % bora se može istaložiti iz rastvora kroz dva stepena, i pri tome je utvrđeno da se pri taloženju dobije 38 % B2O3.Reference
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