Presently we are using tri-sodium phosphate to treat boiler feed water in our boiler but it has not been effective as expected
Maybe this way: "A solution of sodium silicate is acidified to produce a gelatinous precipitate that is washed, then dehydrated to produce colorless silica gel.[5] When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH4)2CoCl4 or cobalt chloride CoCl2 is added.[5] This will cause the gel to be blue when dry and pink when hydrated.[5] An alternative indicator is methyl violet which is orange when dry and green when hydrated." -http://en.wikipedia.org/wiki/Silica_gel. NaSi is quite easy to produce - or you can buy it. Regards!
seems to be a misunderstanding on the mechanism. Trisodium phosphate is used to stabilize, disperse silica and to prevent its precipitation. The best way to go seems to me to contact the sales rep to suggest efficient product for your application, which will depend on your feed water quality.
Silica is always a difficult one. Do you know why the current treatment is not effective? What are the current concentrations of Silica? Have you considered other technology to purify the boiler feed. ie Reverse Osmosis / Electro Deionisation ??
If it's not a problem for your boiler, you could try to acidify the water. Silicates should precipitate out below pH 7 or 8 at room temp. I don't know about in hot water however.
Send me analysis of your boiler feed water & i will give you the best solution
Please see the Silic Salt publications on World Leather or EC FP5 Project report. This could be helpful
Sir,
Try with lime powder & you will remove total silica at 9 Ph.
Regards
Prakash Shah
Why not try runnning your boiler feed water through an anion exchanger! Usually a quaternary ammonium based anion exchanger either type I or type II will be able to remove silicates.
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