The paper asks about extracting magnesium oxide from the brine. Brine-soda method to the purification of brine by adding sodium carbonate, the preparation of basic magnesium carbonate, basic magnesium carbonate magnesium oxide after calcination. The experimental results show that the Barium chloride concentration of 0.13 mol/L, and the water bath temperature of 40 ℃, feed rate the 5 mL/min, aging time for lh brine purification best. The ratio of raw materials to 110 %, the reaction temperature is 60℃, reaction time was 30 min, and Magnesium oxide yield.%采用卤水－纯碱法，向经过净化的卤水中加入碳酸钠，制取碱式碳酸镁，经过煅烧得到氧化镁。实验结果表明：反应浓度O．13mol／L、反应温度40℃、加科速度5mL／min、陈化时间1h时卤水的净化效果较好。原料配比110％、反应温度60℃、反应时间30min时氧化镁的收率较好。
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