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Spectrophotometry application for the montmorillonite content determination in moulding sands with bentonite

Grabowska B., Holtzer M., Kot I., Kwaśniewska-Królikowska D.

Metallurgy and Foundry Engineering

2011

Vol. 37, no. 1

73-79

The theoretical bases of spectrophotometry used in analysis are discussed in the paper as well as the results of investigations of the montmorillonite content by means of the spectrophotometric adsorption of the Cu(II)-triethylenetetramine (Cu-TET) complex are presented. Bentonites originated from various producers (Sud Chemie, ZGM Zębiec S.A,) as well as samples of model moulding sands bonded by these bentonites were inwestigated in respect of their montmorillonite content. The montmorillonite content was measured in samples being at a room temperature and at temperatures of 400 °C and 700 °C. It was indicated, that the determined montmorillonite content in bentonite for the bentonites under investigation and for the model moulding sands with bentonites, are comparable, which proves that the quartz matrix, does not disrupt the measuring methodology and the applied spectrophotometric method is suitable for the moulding sands. It was found that at a temperature of 700 °C montmorillonite undergoes deactivation in the tested bentonites.

W publikacji omówiono podstawy teoretyczne spektrofotometrii wykorzystywanej w analityce chemicznej oraz przedstawiono wyniki badań zawartości montmorillonitu metodą spektrofotometryczną adsorpcji kompleksu Cu(II)-trietylenotetraminy (Cu-TET). Zbadano bentonity pochodzące od różnych producentów (Sud-Chemie, ZGM Zębiec S.A.) oraz próbki modelowych mas formierskich wiązanych tymi bentonitami pod względem ich zawartości montmorillonitu. Zawartość montmorillonitu mierzono w próbkach w temperaturze pokojowej oraz w próbkach wygrzewanych w temperaturze 400 °C i 700 °C. Wykazano, że wyznaczone zawartości montmorillonitu w bentonicie dla rozpatrywanych bentonitów i mas modelowych z ich udziałem są porównywalne, co świadczy o tym, że osnowa kwarcowa, nie zakłóca metodyki pomiarowej, a stosowana metoda spektrofotometryczna nadaje się do wykorzystania w odniesieniu do mas formierskich. Stwierdzono, że w temperaturze 700 °C następuje dezaktywacja montmorillonitu w badanych bentonitach.

Advanced oxidation and adsorption modification of dust waste from standard moulding sands

Baliński A.

Archives of Foundry Engineering

2010

Vol. 10, iss. 2

5--12

The article discusses the process of advanced oxidation (AO) with application of ultrasounds and surface modification of the dust waste collected during dry dedusting of processed moulding sands with bentonite binder. A beneficial effect of both AO and adsorption modification of dust waste, when performed with the selected type of polyelectrolyte, on the technological and mechanical properties of moulding sands prepared with an addition of this dust has been stated. In spite of the bentonite content in moulding sand reduced by 43% and replaced with modified dust waste, the mechanical properties, i.e. the compression and tensile strengths, examined on sand specimens have been improved by 10% and 13%, respectively, with no harm to other basic technological sand properties. At the same time, it was also possible to reduce by about 30% the emission rate of the main gaseous component from the BTEX group, i.e. benzene.