Secondary refined brine is high in magnesium
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 20:33. ICP analysis of all six resin towers in Phase 1 and Phase 2 showed that the brine contained high magnesium (calcium)
Have you ever analyzed how much magnesium the brine contains? It's from the sand filter.
Reasons 1. The input amount of sodium hydroxide is too low and does not meet the process requirements. 2. The membrane is damaged, causing leakage of magnesium hydroxide. 3. Inaccurate analysis. Then check the PH value of the filtered brine, the flow rate and temperature of the brine.
Secondary refining of decalcified magnesium uses chelating resin to complex calcium and magnesium ions, which is not only related to the form of calcium and magnesium, but also to the pH of the salt water. Is it because the amount of acid added after the brine came out was not enough, causing magnesium to exist in the form of insoluble hydroxide?
2# flay0303 Check whether the resin poisoning is too deep. I have also encountered this. It is best to replace all the resin. The solution is: See if there are any substitutes for ferric chloride.
flay0303 The salt water coming out of the sand filter contains magnesium and high rigidity.
2# flay0303 The brine from the sand filter contains high magnesium content. Now we use a-cellulose imported from Germany. The effect is better. We are observing it.
That is, the Doyle clarification barrel has not been processed well. The amount of NaOH over-alkali can be increased and the flocculant should also be controlled. Is it possible that there is something wrong with the calcium-magnesium ratio of the original salt? The old process requires the calcium-magnesium ratio to be greater than 1.
flay0303 It was found that the soda ash pipeline was somewhat blocked, and a spare pipeline has been replaced. It is possible that the amount of soda ash added is not enough to produce enough calcium carbonate to help the magnesium hydroxide precipitate. Observe it for a few days to see the effect before drawing a conclusion.
This situation is also possible. It must be because the magnesium removal effect of the clarification barrel is not achieved. The specific reasons must be investigated one by one.
2# flay0303 Check whether the resin poisoning is too deep. I have also encountered this. It is best to replace all the resin. The solution is: See if there are any substitutes for ferric chloride. Resin poisoning is also possible, but we replaced all the resin in one tower and added new resin to the other towers. Besides, if the resin poisoning is too deep, it’s not just magnesium that can’t be removed, but calcium can’t be removed either. Now calcium can be removed.