Publication detail

Hexavalent chromium reduction by ferrous sulphate heptahydrate addition into the Portland clinker

MONČEKOVÁ, M. NOVOTNÝ, R. KOPLÍK, J. KALINA, L. BÍLEK, V. ŠOUKAL, F.

Original Title

Hexavalent chromium reduction by ferrous sulphate heptahydrate addition into the Portland clinker

English Title

Hexavalent chromium reduction by ferrous sulphate heptahydrate addition into the Portland clinker

Type

conference paper

Language

en

Original Abstract

Nowadays, hexavalent chromium and its content in Portland cement is very actual and often discussed topic. The goal of this study was to observe the influence of different ways of addition of ferrous sulphate heptahydrate on the reduction of hexavalent chromium at the hydration of Portland clinker. Ferrous sulphate heptahydrate was added as crystalline powder and also in an aqueous solution. Obtained experimental results clearly showed higher reduction ability of a liquid form compared to the solid substance. The influence of the grain size on the reduction of hexavalent chromium was inve stigated immediately after mixing clinker with water and also during the first days of hydration process. New oxidation layer containing Fe3+species forms around the non- oxidation part of sulphate species. That is why larger grain size showed lower reduction ability of chromium. In this case the additional chromium reduction effect was observed during the first days of hydration. The results were acquired by UV/VIS method according to STN EN 196-10.

English abstract

Nowadays, hexavalent chromium and its content in Portland cement is very actual and often discussed topic. The goal of this study was to observe the influence of different ways of addition of ferrous sulphate heptahydrate on the reduction of hexavalent chromium at the hydration of Portland clinker. Ferrous sulphate heptahydrate was added as crystalline powder and also in an aqueous solution. Obtained experimental results clearly showed higher reduction ability of a liquid form compared to the solid substance. The influence of the grain size on the reduction of hexavalent chromium was inve stigated immediately after mixing clinker with water and also during the first days of hydration process. New oxidation layer containing Fe3+species forms around the non- oxidation part of sulphate species. That is why larger grain size showed lower reduction ability of chromium. In this case the additional chromium reduction effect was observed during the first days of hydration. The results were acquired by UV/VIS method according to STN EN 196-10.

Keywords

Hexavalent chromium; reduction; Portland clinker; ferrous sulphate heptahydrate

Released

01.08.2016

ISBN

1877-7058

Periodical

Procedia Engineering

Year of study

151

Number

2016

State

NL

Pages from

73

Pages to

79

Pages count

7

Documents

BibTex


@inproceedings{BUT127100,
  author="Miroslava {Mončeková} and Radoslav {Novotný} and Jan {Koplík} and Lukáš {Kalina} and Vlastimil {Bílek} and František {Šoukal}",
  title="Hexavalent chromium reduction by ferrous sulphate heptahydrate addition into the Portland clinker",
  annote="Nowadays,  hexavalent  chromium  and  its  content  in  Portland  cement  is  very  actual  and  often  discussed  topic.  The  goal  of  this study was to observe the influence of different ways of addition of ferrous sulphate heptahydrate on the reduction of hexavalent chromium  at  the  hydration  of  Portland  clinker.  Ferrous  sulphate  heptahydrate  was  added  as  crystalline  powder  and  also  in  an  aqueous  solution.  Obtained  experimental  results  clearly  showed  higher  reduction  ability  of  a  liquid  form  compared  to  the  solid  
substance.  The  influence  of  the  grain  size  on  the  reduction  of hexavalent  chromium  was  inve
stigated  immediately  after  mixing  clinker with water and also during the first days of hydration process. New oxidation layer containing Fe3+species forms around the non- oxidation part of sulphate species. That is why larger grain size showed lower reduction ability of chromium. In this case the additional chromium reduction effect was observed during the first days of hydration. The results were acquired by UV/VIS method according to STN EN 196-10.",
  booktitle="International Conference on Ecology and new Building materials and products, ICEBMP 2016",
  chapter="127100",
  doi="10.1016/j.proeng.2016.07.382",
  howpublished="online",
  number="2016",
  year="2016",
  month="august",
  pages="73--79",
  type="conference paper"
}