【摘要】 本文综合讨论了海水镁砂降硼的重要性和影响含硼量的各种因素,以及降硼的各种方法。着重报导“过碱法”的实验结果。海水先与过量的石灰乳在 pH 11. 6～11. 8下反应,过量的石灰再用补加的海水除去,维持 pH 10. 2～10. 4。氢氧化镁沉淀经过轻烧后得活性氧化镁,再经死烧即得海水镁砂,其硼含量可降至0. 06%（B₂O₃） 。并提出进一步降低硼含量的关键在于降低氢氧化镁沉淀中 CaO 的含量。更多还原

【Abstract】 A Comprehensive discussion is made on the importance of decreasing boron content in sea-water magnesia,the factors influencing the content of boron,and the methods of reducing it.The experimental results of the “overlime” process is reported in this paper. In order to decrease the boron content,sea-water is to be treated first with an excess of hydrated lime at pH 11. 6～11. 8,then the excess of hydrated lime is removed by complementary addition of sea water at pH 10. 2～10. 4,After light burning of the precipitate of magnesium hydroxide and dead burning of active magnesium oxide,the boron content in sea-water magnesia obtained may be reduced to 0. 06%（B₂O₃） .It is suggested that,the derease of CaO content in precipitated magnesium hydroxide will be critical for further decrease of boron content.更多还原