采用聚醚砜管式超滤膜从经过提钙的海水中提取氢氧化镁。试验结果表明,聚醚砜管式膜对海水中氢氧化镁进行分离和浓缩的过程中,通量稳定,抗污染性能好,在0.1 MPa、20℃条件下膜通量达90 L.m-2.h-1,对氢氧化镁截留率可达99%以上,浓缩倍数可达7倍。经过酸碱清洗,膜的通量恢复率能达到80%以上。 Polyethersulfone tube ultrafiltration membrane was used to extract magnesium hydroxide from seawater after calcium extraction. The experimental results showed that the flux of poly (ether sulfone) tubular membrane was stable and the antifouling performance was good when the magnesium hydroxide was separated and concentrated in seawater. Under the conditions of 0.1 MPa and 20 ℃, membrane flux reached 90 Lm-2. h-1, the retention rate of magnesium hydroxide up to 99%, concentration up to 7 times. After acid-base cleaning, membrane flux recovery rate can reach more than 80%.