| abstract |
The invention discloses a kind of brine method of comprehensive utilization, include the following steps：(1) ultrafiltration membrane is utilized to pre-process subsurface brine.(2) the lower smart brine of salt content≤8wt%, divalent ion content and the higher dense brine of divalent ion content are obtained using nanofiltration membrane treatment；(3) smart brine is concentrated using homogeneous membrane electric dialyzator, obtains the dense brine of essence of salt content >=16wt%, while obtaining the fresh water of salt content≤1wt%；(4) gained fresh water is processed into softened water through ultrapure water system, and the concentrated water return to step (3) of reverse osmosis generation repeats to concentrate；(5) the dense brine of gained carries out tedding concentrate, obtains sodium sulphate and sodium chloride, while generating the higher bittern of magnesium ion content；(6) bittern is subjected to ammonia process reaction and secondary refining, obtains refined brine and magnesium hydroxide.Brine is comprehensively utilized and is combined with soda manufacture by the present invention, realizes brine soda ash combined producting, bittern zero-emission, entire production process is without discharge. |