How to extract 10% calcium chloride from wastewater or remove calcium
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I would like to ask those with expertise in chemical engineering: how can 10% calcium chloride in wastewater be extracted or how can the calcium be removed?
Are costs considered? If costs permit, an adequate amount of soda ash can be added to remove the calcium precipitate, and the resulting sodium chloride can then be dried to produce industrial salt. Alkalis are more expensive than salts; please give it some thought.
Thank you. We have considered the chemical method for removing hardness, but the cost is still too high
The impurities in wastewater can be directly evaporated using a drum scraper dryer. Please contact me.
Boss, this involves using salt and stones to produce calcium chloride and soda ash; if you do it the other way around, won’t you suffer losses?
The membrane method can be considered; its treatment effect is good
For cation exchange resins, only calcium is considered; if there are other impurities, the order of impurity removal needs to be taken into account
Membrane concentration + evaporation crystallization: calcium chloride can be sold to offset part of the costs
It is concentrated and crystallized using steam, then dried, followed by separation using a centrifuge; if calcium chloride is pure, it can be used as a product to offset some of the costs.