Science – Future of Lithuania / Mokslas – Lietuvos Ateitis, Vol 2, No 6 (2010)

The Impact of Magnesium Oxide on the Hydratation and Features of Mechanicaly Activated Phosphogypsum

Andrejus Jefimovas


Extractive hemihydrate phosphogypsum (E-PG) is the most popular mineral waste in Lithuania. The dumps of that are rapidly growing and the question of possible use still remains open. Phosphogypsum is obtained during the process of extracting phosphoric acid from apatite using sulphuric acid. Due to low activity and contamination with acidic mineral admixtures (phosphorus and fluorine compounds), this technogenic product cannot be used for producing construction materials. Instead of present energy consuming processes used for neutralisation, another method – mechanical activation neutralizing acid admixtures with cement and opoka mix is offered. Whereas cement and opoka are grey, the items made of phosphogypsum (neutralised using these admixtures) are dark. Research was made trying to find out the possibility of gaining the white binder from phosphogypsum. In order to achieve that magnesium oxide was chosen to neutralise phosphogypsum and its impact on E-PG, hydratation and features were studied.

Article in Lithuanian

Article in: English

Article published: 2011-04-13

Keyword(s): phosphogypsum; acidic admixtures; neutralising admixtures; mechanical activation

DOI: 10.3846/mla.2010.107

Full Text: PDF pdf

Science – Future of Lithuania / Mokslas – Lietuvos Ateitis ISSN 2029-2341, eISSN 2029-2252
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 License.