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Ph Vs. Phosphate Dosing

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#1 Guest_krampal29_*

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Posted 12 October 2012 - 05:54 AM

i am just new in my company ion coal power plant...just wanna ask some of your brilliant ideas on how will my issue solve.

i do have hard time to maintain the pH of the drum within 9.2 - 9.6 pH.If i do increase the phosphate doing on it still there is quite low increase of pH but has high increase of specific conductivity that results high phosphate concentration...do u have an idea on how will i change my my dosing of phosphate that will give within the range of pH.thank you

#2 kkala


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Posted 18 October 2012 - 08:06 AM

I would try replacing phosphate being used with another, of higher content in disodium phosphate / trisodium phosphate. This would shift pH to more alkaline regions, in comparison to monosodium phosphate. See attached pdf file, Recommendation 4.
Estimating pH in aqueous solutions (25 oC) of NaH2PO4, Na2HPO4, Na3PO4 using ionic equilibrium principles is not easy ( http://en.wikipedia.org/wiki/Acid_dissociation_constant). But we can qualitatively say that pH will increase with increase of PO43- (or even of HPO42-) anions and corresponding decrease of H2PO4- anions (total molar concentration same). H3PO4 is a rather weak acid (indicated by its dissociation constants).

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Edited by kkala, 18 October 2012 - 08:12 AM.

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