反応晶析による塩基性炭酸マグネシウム粒子の粒径制御  [in Japanese] Size Control of Basic Magnesium Carbonate Particles by Reactive Crystallization  [in Japanese]

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Author(s)

    • 柘植 秀樹 TSUGE Hideki
    • 慶應義塾大学理工学部応用化学科 Keio University, Faculty of Science and Technology, Department of Applied Chemistry
    • 高橋 裕志 TAKAHASHI Yuji
    • 慶應義塾大学理工学部応用化学科 Keio University, Faculty of Science and Technology, Department of Applied Chemistry
    • 藤原 英司 FUJIWARA Eiji
    • 慶應義塾大学理工学部応用化学科 Keio University, Faculty of Science and Technology, Department of Applied Chemistry

Abstract

海水中の溶存資源であるマグネシウムを有効利用することを目指して, 直接炭酸化法を用いて水酸化マグネシウムから塩基性炭酸マグネシウム (Basic Magnesium Carbonate, 以下BMC) を生成させた.BMCは充填剤や食塩の固結防止剤などの原料として利用されるため, その粒径や形状を制御できることが望まれる.本研究では, BMC粒子の粒径および形状を制御する目的で, その生成過程の解明と粒径に関与する諸因子の影響について検討した.<BR>BMC粒子は気泡撹絆槽型晶析槽を用い水酸化マグネシウム懸濁水溶液中に炭酸ガスを吹き込み生成させ, 得られた粒子はX線回折により分析し, 走査型電子顕微鏡写真撮影により粒径, 形状を観察した.<BR>本研究では, 得られたBMC粒子は球状あるいは平板状で, 凝集はほとんど見られなかった.BMC粒子の粒径は水酸化マグネシウムの初濃度と粒径並びに反応温度の影響を受けるが, 水酸化マグネシウムの初濃度と反応温度を調整することによりBMC粒子を4-9μmに制御することができた.

To utilize magnesium in seawater and fix carbon dioxide in exhausted gases, the direct carbonation method has been used to precipitate basic magnesium carbonate (BMC). BMC particles are used as a filler or anticaking agent for NaC1, which means it is necessary to control the size of BMC particles according to production needs. The aims of this study are to clarify the mechanism of reactive crystallization of BMC in the direct carbonation method, and to control the particle size of BMC.<BR>BMC particles were produced in a gas blowing stirred tank crystallizer through a reaction between carbon dioxide and a suspended aqueous solution of magnesium hydroxide. The particles obtained were analyzed by means of X-ray diffraction and photographs were taken with a scanning electron microscope.<BR>In this study, a mixture of spherical and tabular BMC particles was obtained. Agglomeration between particles was not observed very much during the growth of BMC. The particle size of BMC was influenced by the initial concenration and particle size of magnesium hydroxide, and the reaction temperature. By changing the initial concentration of magnesium hydroxide and the reaction temperature, it was possible to control the particle size of BMC to between 4-9 μm.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 55(6), 408-418, 2001-12-01

    The Society of Sea Water Science, Japan

References:  4

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    森江恒男

    多孔質球状塩基性炭酸マグネシウムの製造方法, 1988

    Cited by (1)

  • <no title>

    森江恒男

    炭酸カルシウムを含む球状塩基性炭酸マグネシウムの製造方法, 1988

    Cited by (1)

  • <no title>

    竹永保之

    球状塩基性炭酸マグネシウムおよびその製造方法, 1989

    Cited by (1)

  • Formation of Magnesium Carbonate by Reactive Crystallization  [in Japanese]

    TSUGE Hideki , TANIKAWA Takanobu , SAKAKIBARA Masato

    Bulletin of the Society of Sea Water Science,Japan 50(2), 58-63, 1996-03-31

    References (4) Cited by (3)

Cited by:  4

Codes

  • NII Article ID (NAID)
    10008277669
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03694550
  • NDL Article ID
    5997479
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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