Diaphragm sulfate problem
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This post was last edited by sunjl1981 on 2013-1-6 20:06. If the brine contains about 6g/l sulfate and the saturation is 290-300g/l, use such water to desaturate and evaporate the salt to recover the salt. Can the membrane be removed after saturation? Will the sulfate radicals of the evaporation recovery salt increase cumulatively after long-term operation? This post was last edited by yzhms on 2009-3-20 13:59 ] # , , &
The brine contains 290--300 g/l salt, and the sulfate radical is 6 g/l. The granular salt recovered by saturated evaporation is saturated to 315 g/l and the diaphragm is removed. Will the sulfate radical of the recovered salt evaporated by running like this increase cumulatively? This post was last edited by yzhms on 2009-3-20 13:59 ]
What I mean is that 290-300 grams of salt water contains 6 grams of sulfate per liter. The recovered salt from desaturation and evaporation reaches 315 grams. After saturation, the sulfate is no longer removed. The electrolyte returned after removing the diaphragm and electrolysis is evaporated again. Will the sulfate of the recycled salt increase cumulatively? Evaporation is 30% of alkali. This post was last edited by yzhms on 2009-3-20 14:00 ]
We have never tried to run it like this, but someone has run it like this,
Recovering the sulfate radicals in the salt during the evaporation process will cause the alkali solution to take away part of it. I have seen posts before saying that it can take away about 2 grams.
It seems that diaphragm caustic soda can be used without sulfate removal device. If it is raw salt, I don’t know if the brine contains more sulfate than raw salt.