A STUDY OF PREPARATION OF MAGNESIA WITH LOW BORON CONTENT FROM SEAWATER WITH ADSORPTION METHOD
吸附法制取低硼海水镁砂的研究

Most of boron was removed previously from seawater by means of magnesium hydroxide as adsorbent and a low-boron-seawater was obtained. Then, the low-boron-seawater reacted with the milk of calcium hydroxide, and a high pure Mg(OH)2 was precipitated from seawater. After filtering and sintering, the low-boron-seawater-magnesia was resulted, of which the chemical compositions are: MgO(99.5%), CaO(0.45%), B203(0.018%). The important points for preparation are: (1) The boron content of the adsorbent itself must be as low as possible. (2) The slurry formed by the adsorbent must be washed with ten times of water freefrom C02. (3) The optimal amount of adsorbent required is 5g (as MgO) per liter of seawater. (4) It is more advantageous to carry out the reaction in two steps.