Author:
Demediuk T,Cole WF,Hueber HV
Abstract
The reactions which take place in the
system MgO-MgCl2-H2O at
concentrations of MgCl2 solutions up to 45
per cent. and temperatures from 0 to 110 �C have been studied in detail. Four
oxychlorides have been found, namely, 9Mg(OH)2.MgCl2.5H2O, 5Mg(OH)2.MgCl2.8H2O,
3Mg(OH)2.MgCl2.8H2O,
and 2Mg(OH)2.MgCl2.4H2O
; and an equilibrium diagram has been produced which gives the conditions at
which each is stable. It is probable that in the formation of the oxychlorides
a complex ion forms first and this reacts with Mg(OH)2, formed by
rapid hydration of MgO, to produce amorphous oxychloride gels which slowly
crystallize.
The reactions in the systems MgO-CaCl2-H2O, CaO-MgCl2-H2O,
Ca(OH)2-MgCl2-H2O, CaO-CaCl2-H2O, Ca(OH)2-CaCl2-H2O, and between calcined
dolomite and MgCl2, or CaCl2.
solutions have been studied briefly. Oxychlorides form in these reactions also.
It is therefore suggested that the explanation for the success of the method of
Demediuk (1952) for the removal of " unsoundness " of dolomitic
limes, and other limes high in magnesium oxide, by the action of salt solutions
lies in the conversion of free magnesium oxide to magnesium oxychlorides.
The optical properties and stabilities of
the magnesium oxychlorides are briefly discussed.
Cited by
105 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献