CPC B01D 61/026 (2022.08) [B01D 9/0059 (2013.01); B01D 9/02 (2013.01); C01F 5/34 (2013.01); C01F 11/468 (2013.01); B01D 2009/0086 (2013.01)] | 19 Claims |
1. A system for production of minerals from divalent ion-containing brine, comprising:
a first nanofiltration seawater reverse osmosis (NF-SWRO) membrane unit configured to receive a divalent-ion rich reject stream and to reject sulfate while allowing divalent ions to pass into a first permeate stream;
a first concentration unit configured to receive the first permeate stream and produce solid calcium sulfate dihydrate and a magnesium-rich brine stream;
a second concentration unit configured to receive and concentrate the magnesium-rich brine stream to a saturation point of sodium chloride;
a first crystallizing unit configured to receive the concentrated magnesium-rich brine stream and produce solid sodium chloride and a supernatant product stream;
a third concentration unit configured to receive the supernatant product stream and produce a concentrated magnesium-rich bittern stream; and
at least one of
a second crystallizing unit configured to dry the concentrated magnesium-rich bittern stream and produce hydrated magnesium chloride, and
a dry air process unit configured to prill the concentrated magnesium-rich bittern stream under a hydrogen chloride atmosphere to produce anhydrous magnesium chloride.
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