1results about How to "Efficient and selective separation" patented technology

The application discloses a preparation method of low-calcium-magnesium strontium-rich water and application thereof. The method comprises the following steps: filtering strontium-containing raw water through quartz sand and activated carbon in sequence, and performing primary nanofiltration separation through a polyamide composite nanofiltration membrane; and then performing secondary nanofiltration separation through a sulfonated polyether sulfone composite nanofiltration membrane. According to the strontium content in the water produced by the secondary nanofiltration, the water can be mineralized through a selective strontium-rich mineralization filter element made of strontium spar, celestite and palygorskite which are sintered and subjected to carbonation treatment. Through the cascade synergistic effect of the two-stage nanofiltration, the application realizes efficient removal of calcium and magnesium ions, and obtains strontium-rich water with a strontium content of 2.0-8.5 mg / L and a significantly reduced calcium, magnesium and chlorine ion content, which can be applied in the fields of medicine, beverage, drinking water or health food.