Publication result detail

Gypsum dehydration to Alpha-gypsum in mixed chloride solutions

DVOŘÁK, K.; FRIDRICHOVÁ, M.; GAZDIČ, D.

Original Title

Gypsum dehydration to Alpha-gypsum in mixed chloride solutions

English Title

Gypsum dehydration to Alpha-gypsum in mixed chloride solutions

Type

Peer-reviewed article not indexed in WoS or Scopus

Original Abstract

Brno University of Technology solves in the long term the problem of alpha gypsum preparation by dehydrating the gypsum in the solution of chloride salts. This study verified that alpha-gypsum can be trouble free prepared by gypsum dehydration in solution of a number chloride salts, among others CaCl2, MgCl2 or NaCl. In the same time it was found that owing to the different electro-chemical behavior of Potassium ions, the by heat conditioned reaction of gypsum with the KCl solution the dehydration doesnt take place, but a partial substitution of Potassium ions by Calcium ions takes place. The product of this reaction is the mineral görgeyit, K2SO4.5CaSO4.H2O.This important problem was solved by reduction of the extremely electrochemical high mobility of Potassium ions by the method of the mixed chloride solution with Potassium and Sodium ions, the mobility of which is in comparison with the preceding only one third. Samples of hemihydrate in the solution of mixed salts were prepared and tested in conclusion of the research.

English abstract

Brno University of Technology solves in the long term the problem of alpha gypsum preparation by dehydrating the gypsum in the solution of chloride salts. This study verified that alpha-gypsum can be trouble free prepared by gypsum dehydration in solution of a number chloride salts, among others CaCl2, MgCl2 or NaCl. In the same time it was found that owing to the different electro-chemical behavior of Potassium ions, the by heat conditioned reaction of gypsum with the KCl solution the dehydration doesnt take place, but a partial substitution of Potassium ions by Calcium ions takes place. The product of this reaction is the mineral görgeyit, K2SO4.5CaSO4.H2O.This important problem was solved by reduction of the extremely electrochemical high mobility of Potassium ions by the method of the mixed chloride solution with Potassium and Sodium ions, the mobility of which is in comparison with the preceding only one third. Samples of hemihydrate in the solution of mixed salts were prepared and tested in conclusion of the research.

Keywords

Alpha gypsum, gorgeyte

Key words in English

Alpha gypsum, gorgeyte

Authors

DVOŘÁK, K.; FRIDRICHOVÁ, M.; GAZDIČ, D.

RIV year

2012

Released

24.01.2012

Publisher

Trans Tech Publications, Switzerland

Location

ICAMEM 2011

ISBN

1022-6680

Periodical

Advanced Materials Research

Volume

457

Number

1

State

Swiss Confederation

Pages from

391

Pages to

394

Pages count

4

BibTex

@article{BUT88959,
  author="Karel {Dvořák} and Marcela {Fridrichová} and Dominik {Gazdič}",
  title="Gypsum dehydration to Alpha-gypsum in mixed chloride solutions",
  journal="Advanced Materials Research",
  year="2012",
  volume="457",
  number="1",
  pages="391--394",
  issn="1022-6680"
}