On Comparison of Direct and Indirect (Two Stage Method) Preparation of Magnesium Hydroxide from Calcium Carbide and Magnesium Chloride

DOI

Bibliographic Information

Other Title
  • カルシウムカーバイドと塩化マグネシウムより直接法および間接法 (二段法) により生成する水酸化マグネシウムの比較

Search this article

Description

Mg(OH)2 obtained by direct reaction of CaC2 and MgCl2 solution has 2 advantages such as lower content of CaO and easiness of filtration, the reason of which was discussed in previous papers.<BR>In the present paper this direct method was compared with an indirect (2 stages) method in which at first CaC2 was reacted with H2O instead of MgCl2 solution to produce C2H2, then the residual milk of lime Ca(OH)2 was added to MgCl2 solution, in remarking that amounts of 3 components CaC2, H2O, MgCl2 were taken to get as same concentration of the end product Mg(OH)2 as possible.<BR>Results of experiment were as well as expected.<BR>Mg(OH)2 obtained from CaC2 and 20 to 40% of MgCl2 solution by direct method has larger crystallite, better property of filtration and less content of CaO than those by indirect method.<BR>This fact may be probablly illustrated by the opinion that crystallisation of Mg(OH)2 does not only be acceralated as a result of less existence of intermediate product Ca(OH)2 but also under evolution of C2H2 the reaction of Ca(OH)2 with CO, in air to produce CaCO2 is kept away.<BR>In other each case of 1% or 60% MgCl2solution, such relation as mentioned above could not be found because of difficulties of their exact comparison.

Journal

Details 詳細情報について

  • CRID
    1390282679573635712
  • NII Article ID
    130004417273
  • DOI
    10.11457/swsj1950.12.4_180
  • ISSN
    21870322
    03695646
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top