| 吸附法制取低硼海水镁砂的研究 |
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| 引用本文： | 孙国清.吸附法制取低硼海水镁砂的研究[J].海洋科学,1986,10(2):24-28. |
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| 作者姓名： | 孙国清 |
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| 作者单位： | 华东师范大学 上海 |
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| 摘 要： | 海水氧化镁(烧结后亦称海水镁砂)具有纯度高、成份稳定,既可制得高质量产品,生产中又易于配料等优点,因而是炼钢炉碱性耐火材料的优良原料。 当用石灰乳以海水沉淀镁时,因Mg(OH)_2胶体带正电荷,海水中硼呈B(OH)_4-负离子,由于静电吸引,将硼一起吸附下来;若海水中硼全部被Mg(OH)_2胶体吸附,可使MgO中的硼含量达到0.7％(以B_2O_3计)。Byrne和Kestor指出,海水中B(OH)_4-负离子有部分与Na~+,Mg~(2+),Ca~(2+)等形成络合物NaB(OH)_4,MgB(OH)_4~+,CaB(OH)~+,它们不带电荷或
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A STUDY OF PREPARATION OF MAGNESIA WITH LOW BORON CONTENT FROM SEAWATER WITH ADSORPTION METHOD |
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| Abstract: | 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. |
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