I want remove sulphate, carbonate and calcium ions with CaCl2, HCl and H2SO4 in a solution containing Ca2+, Mg2+, Na+, K+, CO3 2-, SO4 2- and Cl- ions, respectively. How I can find out required amounts of this salt and acids as well as amount of forming compounds with PHREEQC program, finally?
Thank from your response.
My goal is recovery of magnesium compounds. So, if I increase pH, The risk of magnesium hydroxide precipitation increase along with other impurities and this is not my favorite. I should romove impurities before magnesium recovery. Is there a good method to remove impurities?
If you wish to purify magnesium ions in a set solution I'd rather look into different separation processes (e.g. chromatography or liquid-liquid extractions) rather than using acids and bases to precipitate inorganic cations and anions from solution. This is also inherently difficult to simulate with software like PHREEQC, because of the formation of solid solutions: when you would precipitate calcium carbonate, you'd inherently also remove magnesium from solution due to the formation of magnesian calcite.
But if you're set at precipitating calcium sulfate and carbonate, i wouldn't look at changing the pH i would use different ions that are relatively insoluble with set ion. Such as barium for the precipitation of sulfate (although you'd have to look into the kinetics as well, because barium sulfate might be kinetically unfavourable to precipitate).
Hello, Dr Bots;
Thank you,
I have a bittern sample that its magnesium concentration is very high an I want separate its magnesium compounds (specially Mg(OH)2). For this work I'd use from strong bases. In papers, impurities ions such as sulphate, carbonate and calcium is removed to avoid staying impurities in the final product.
- Badges
- Science method
- Similar topics
- Mathematics
- Statistics
- Statistical Techniques
- Structural Equation Modeling