Can sodium sulfate and manganese sulfate be obtained through evaporation crystallization?
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The wastewater contains 3 g/L of sodium sulfate, 3 g/L of manganese sulfate, and 25 g/L of sulfuric acid. I would like to know how this wastewater should be treated. Is it necessary to recycle by-products? Both sodium sulfate and manganese sulfate can be evaporated and crystallized, so isn’t it possible to recover both salts through this process? I’ve only recently started working with water treatment and am still a beginner; I appreciate the help from those who are more experienced. Thank you.
It’s possible; it seems that evaporation crystallization yields the most ideal results, as it allows for the recovery of by-product salt. However, the salt obtained is mixed, and the technologies needed for salt separation as well as the associated investment are quite substantial
I’ve seen methods for separating manganese sulfate and magnesium sulfate through fractional evaporation. Is it possible to do the same with sodium sulfate and manganese sulfate? Whether this is feasible depends on certain factors
We don’t understand filter membrane separation; we only have some knowledge of evaporation crystallization. We’ve heard of separation after evaporation, but in the initial stage of separation, there is no mixture of two substances
Could evaporation be carried out in stages, based on different phase diagram curves and varying solubilities at different temperatures? In other words, within a certain temperature range, one substance crystallizes while another does not reach the conditions necessary for crystallization.
It is possible to obtain a pure crystalline salt by evaporation from these two salts, but the purity of the other salt will inevitably be low. In your water, the sodium sulfate crystalline salts can be easily removed through evaporation, but manganese sulfate contains a small amount of sodium sulfate, and subsequent treatment is required to purify it.
Thank you very much. I would like to ask again: what are the principles for selecting the temperature for evaporation crystallization? Is it based on the solubility of the salt-water system? Is it reasonable to precipitate manganese sulfate at 150°C and sodium sulfate at 70°C? Does the treatment require dealing with sulfuric acid first?
Are you precipitating manganese sulfate at 150°C? How many effects are you using? Sulfuric acid certainly needs to be treated first; otherwise, the material of the evaporator won’t withstand it
I’m not sure; I came up with this idea by looking at some information, and I don’t know if it’s feasible, so I’m seeking advice from experts. I’m not sure either whether to use multiple effects; do you have any suggestions? Thank you
I have conducted on-site testing of the MVR process for several projects involving wastewater containing sodium sulfate and manganese sulfate