Density of solutions of dissolved solids (NaCN, Lime, SMBS)
Density of solutions of dissolved solids (NaCN, Lime, SMBS)
(OP)
Hi guys, I need a way to detirmine the density of a solution in which I have dissolved solids to a certain w/w concentration- be they Sodium cyanide, Lime (hydrated), and Sodium metabisulphite (SMBS).
Where would I look for this information?
Where would I look for this information?
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RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
If you would like to have a three component diagram at various temperatures then you should prepare the experiment more carefully and with more equipment;a direct read-out electronic density meter would help you a lot because you will probably repeat measurements a few times. You should select the range of your concentrations. For most effective work search for "Design of experiments.mixtures" that you can find in almost each statistical software. Prepare solutions and repeat density-temperature scans.Design of experiments.Analysis tools will help you to prepare a result expresed as a function density=f(x1,x2,x3,T).
m777182
RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
i.e. I want the answer to- what is the density of a 15w/w% solution of SMBS at 20C?
What is the density of a 20w/w% solution of sodium cyanide at 20C?
I find it hard to believe that this info is not listed somewhere? I do not have access to experimental apparatus, as we are simply in the design stage.
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RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
Sodium Metabisulfite is a white, or offwhite, finely crystalline powder with a faint sulfur dioxide odor.
What strength is your hydrated lime slurry?
RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
"density of a 15w/w% solution of SMBS at 20C?"
--- SG ~ 100/85 = 1.176
"What is the density of a 20w/w% solution of sodium cyanide at 20C?"
--- SG ~ 100/80 = 1.25
Experimentally, I first use a wide range SG hydrometer, SG 1.00-2.00. Then use a narrow range hydrometer, e.g., 1.080-1.150 to control a zincate solution of desired SG 1.120, for more precision. SG hydrometers:
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Of course, with slurry you have 2 SG values. If you let settle, you can get the SG of the solution per se (at saturation dissolution). If keep stirring, get the slurry SG, i.e., that of the solution containing suspended solids.
RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
Kenvlach, I did that, but acc to my calcs dissolving lime (For example) causes the volume of the solution to DECREASE ...
eg.
start with 17T of water ~17m3
Dissolve 3T of Lime in it to make up 15 w/w% solution
SG lime (solid) = 2.3
SG Water (l) = 1.0
SG Mixture = 2.3*15%+1.0*85% = 1.2
therefore volume of a 20T solution of 15w/w% lime = 20/1.2=16.7m3 .... LESS than the water you added in the first place, which, I have been told is not practically observed (i.e. you add lime bags to a tank of water, and the level of the solution increases).
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RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
SG ~ 20/17 = 1.176
Second, when you quickly dump solids into a volume of water, the gross volume will of course increase. It will then decrease as dissolution occurs. For strongly exothermic dissolution, the total volume can even be less than the initial volume of water (after the solution has cooled back to original T).
Third, lots of data on the Internet. E.g.,
"At 20 degrees C, hydrated lime has a solubility of 0.165 grams per 100 grams of saturated solution."
--- Since the solubility is so low, the volume of the slurry will be significantly greater than the initial volume of water. But, still less than the gross or total volume. Maybe a 5% decrease just for getting rid of the air in the powdered lime.
Do a search.
RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
Secondly, my maths is not wrong, I have simply made an assumtion- just as you have in assuming the volume of fluid does not change in arriving at your SG = 1.176 figure ... this does not help me as it is the final volume of solution that I want to know in the end - I can't just assume it!
Thirdly, I have searched on the internet, and have not found the solution density stated clearly anywhere ...
Finally,
"Since the solubility is so low, the volume of the slurry will be significantly greater than the initial volume of water"
Thank you, for some reason my reference has the solubility of lime at 16g/100g so I assumed it would all fully dissolve ... (somobdy missed a few decimal places!). In that case Iguess it would be reasonable to assume that none of the lime dissolves (for arguments sake) and the slurry is just a suspension of solid particles. therefore
17T of water =17m3
3T lime = 3/2.3 = 1.3m3
density of mixture (Slurry) = 20/(17+1.3) = 1.09 t/m3
That is now the 3rd value we have got!
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RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
More info can be found by searching the Internet. E.g.,
"A lime slurry with a density of 35% solids will weigh approximately 10.3 pounds per gallon and contain 3.6 pounds dry solids per gallon." -- http://www.gilmourlime.com/hydrated_lime.html
This bit of data gives SG = 1.10 for 15% solids by linear interpolation. So, your 3rd value is quite reasonable.
RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
Cub3bead: I couldn't find any solution density info for Sodium bisulphite (as opposed to SMBS) either?
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RE: Density of solutions of dissolved solids (NaCN, Lime, SMBS)
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