Influence of hydrating agents on the hydration of industrial magnesium oxide

dc.contributor.authorMatabola, Kgabo P.
dc.contributor.authorVan der Merwe, Elizabet Margaretha
dc.contributor.authorStrydom, C.A. (Christiena Adriana)
dc.contributor.authorLabuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)
dc.contributor.emailliezel.vandermerwe@up.ac.zaen_US
dc.date.accessioned2011-08-24T06:44:06Z
dc.date.available2011-08-24T06:44:06Z
dc.date.issued2010-12
dc.description.abstractBACKGROUND: The influence of different hydrating agents on the pH of the hydrating solutions, rate of hydration of MgO to Mg(OH)2 and product surface area was studied as a function of temperature of hydration. Hydrating agents used were aqueous solutions of ammonium chloride, magnesium acetate, magnesium nitrate, nitric acid, acetic acid, magnesium chloride, sodium acetate and hydrochloric acid and distilled water as control. RESULTS: There was not a significant difference in the hydration behavior of the hydrating agents up to 50 °C, where less than 10 % of magnesium hydroxide was formed. The amount of hydroxide increased at temperatures above 60 °C. When compared to the hydration in water, all the hydrating agents with the exception of sodium acetate showed a significant increase in the degree of hydration. Sodium acetate formed the lowest amount of magnesium hydroxide, ranging between 1.2 and 12.2 % magnesium hydroxide. The largest percentage (56.7 %) magnesium hydroxide was formed from the hydration in magnesium acetate. CONCLUSION: It seems that MgO hydration is a dissolution-precipitation process controlled by the dissolution of MgO. The increased degree of hydration in magnesium acetate is possibly due to the presence of acetate and Mg2+ ions.en
dc.description.urihttp://www.blackwell-synergy.com.en_US
dc.identifier.citationMatabola, KP, Van Der Merwe, EM, Strydom, CA & Labuschagne, FJW 2010, 'Influence of hydrating agents on the hydration of industrial magnesium oxide', Journal of Chemical Technology and Biotechnology, vol. 85, no. 12, pp. 1569-1574.en
dc.identifier.issn0268-2575 (print)
dc.identifier.issn1097-4660 (online)
dc.identifier.otherDOI: 10.1002/jctb.2467
dc.identifier.urihttp://hdl.handle.net/2263/17145
dc.language.isoenen_US
dc.publisherWiley-Blackwellen_US
dc.rightsWiley-Blackwell. The definite version is available at http://www.blackwell-synergy.com.en
dc.subjectMagnesium acetateen
dc.subject.lcshMagnesium oxideen
dc.subject.lcshHydrationen
dc.subject.lcshAcetic aciden
dc.subject.lcshHeat of hydrationen
dc.titleInfluence of hydrating agents on the hydration of industrial magnesium oxideen
dc.title.alternativeInfluence of hydrating agents on MgO hydrationen
dc.typePreprint Articleen

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