catalanotte
Well-Known Member
- Joined
- Jul 30, 2014
- Messages
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I have been trying to reduce alkalinity with lime and dropped from about 360 ppm to 50 ppm as CaCO3. I also have high magnesium (52 ppm) and am hopeful that the precipitate contains some Mg. Brewersfriend water calculator assumes all of the precipitate is CaCO3 but I have read other articles that indicate magnesium hydroxide can also drop out, but magnesium carbonate is highly soluble and likely won't. Does anyone know how to predict the ratio of CaCO3 to Mg(OH)2 I should expect? Is there anything I can do (pH or temperature) to get more Mg to drop?
I started with 9 gal of water
KH as CaCO3 - 360 ppm
PH 7.5.
Ca - 80 ppm
Mg - 52 ppm
Added
13 g Lime
10 g CaCl
5 g Gypsum
Ended with
KH as CaCO3 - 50 ppm
PH 10.3
Precipitated out 28 g (oven dried)
I did some math on the reactions and don't believe that I lost enough carbonate to make up the full 28 grams so I am assuming it is coming from magnesium hydroxide. Any thoughts.
I could just blend with RO/DI but find this process interesting and want to engineer the water to make it work.
I started with 9 gal of water
KH as CaCO3 - 360 ppm
PH 7.5.
Ca - 80 ppm
Mg - 52 ppm
Added
13 g Lime
10 g CaCl
5 g Gypsum
Ended with
KH as CaCO3 - 50 ppm
PH 10.3
Precipitated out 28 g (oven dried)
I did some math on the reactions and don't believe that I lost enough carbonate to make up the full 28 grams so I am assuming it is coming from magnesium hydroxide. Any thoughts.
I could just blend with RO/DI but find this process interesting and want to engineer the water to make it work.