A method other than sulfate?
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This post was last edited by sunjl1981 on 2013-1-6 at 19:48. For caustic soda with an annual production of 50,000 tons and a halide content of around 20%, what is the best method for removing sulfate ions? Please give some advice! ! It is the diaphragm caustic soda process. # ， ， &
We use membrane desalination technology, which is our patent
There are the barium method, the freezing method, and the calcium method. The barium method is commonly used.
The current level of sulfate ions among you depends mainly on their concentration and the rate at which they are increasing; this determines what appropriate method to use. Such as the barium method, membrane method, calcium method, etc. This post was last edited by LMT168 on 2009-4-15 at 14:09.]
Clarification tanks are fed with barium chloride to remove calcium and magnesium as well.
How effective is the calcium method? ! I see that Yibin Tianyuan uses a calcium-based nitration removal process, which is carried out through HVM reactors and filters. I’m just not sure whether this process can truly prevent scaling Does anyone know! ?
With the barium method, it actually mainly depends on the rate of increase in sulfate ions
Methods for removing sulfate ions: freezing method, calcium method, barium method, membrane method. The freezing method is suitable for brines with high sulfate levels; the calcium method works as well, but it increases the consumption of soda ash. For capacities below 100,000 tons, the barium method is acceptable, while for larger capacities, the membrane method is the best choice. Membrane-based removal of sulfate ions is a trend in the development of chlor-alkali industry.
The cost of nitrate removal using the barium method is high, and there are corrosion issues with the equipment; we are considering using the membrane method for nitrate removal. Since 2007, the membrane-based nitrate removal process has become more mature, and it has been increasingly adopted. However, issues such as the lifespan of the membranes used in membrane-based nitrogen removal, as well as any impact on the membranes of ion-exchange membrane cells and the extent of such impact, still need to be verified through practical testing.
The sulfate concentration is currently around 9 g/l. I would like to ask how to determine this rate of increase, using the barium method or the calcium method? I’m a bit confused. Could you tell me what kind of growth rate and what method to choose? Our company doesn’t use brine on a long-term basis; we mainly adjust our choices based on market conditions. Since our production volume isn’t high, we simply use whatever is cheaper.