Our research activities: Work Package 2: Identification of physicochemical properties of CRT glass with respect to the screen and the cone glass.
Tests were carried out with material:
waste material from the company O-Pal Ltd, having its seat in Skierniewice, Warszawska Street No. 1. The company has been registered in the Main Supervising Office for Environmetal Protection under nr E 00011457 ZPR;
obtained from 2 pieces of kinescopes, which had been delivered by the Norwegian Partner.
In the both cases the separate tested material was screen glass and cone glass.
The scope of tests included:
Chemical analysis carried out according to the norm PN-85/B-13160 Glass Test procedures. Chemical analysis.;
Determination of fusion temperature according to the Instruction I-CF/5-K/3/01/CF;
Determination of natural radioactivity according to the instruction the Institute of Building Technique „Determination of natural radioactivity in building materials” Nr 455/2010
The Testing Laboratory of ICiMB possesses accreditation for carrying out this test from The Polish Centre for Accreditation certificate No. AB 115.
The guiding principles for IPPC (Integrated Pollution Prevention and Control) installation indicate the following contribution scopes of individual oxides in composition of kinescope glass.
The test results of the presented material show that the glass of the Norwegian and Polish screen contains additionally iron oxide Fe2O3, titanium oxide TiO2, zinc oxide ZnO, lead oxide PbO, trace amounts of copper oxide CuO, antimony oxide Sb2O3, in comparison with the IPPC guiding principles. Besides in glass of the Norwegian screen content of strontium oxide SrO exceeds by 2.38% values shown in the guiding principles. Additionally in the Polish screen lithium oxide Li2O and nickel oxide NiO are present.
Glass of the Norwegian and Polish cones contains additionally iron oxide Fe2O3, titanium oxide TiO2, zinc oxide ZnO, antimony oxide Sb2O3, trace amounts of copper oxide CuO, in comparison with the IPPC guiding principles. In the both samples content of strontium oxide SrO in increased comparing with the guiding principles. In the Norwegian cone it is bigger by 94%, in the Polish one – by 12%.
In the Polish cone a small amount of boron oxide B2O3 as well as trace amounts of nickel oxide NiO and cadmium oxide CdO are present.
Determination of Fusion Temperature:
In the table there are mean values of at least two measurement. The results suggest that the glass will behave similarly in the firing process.
Determination of natural radioactivity
The basis for the assessment of natural radioactivity of the sample are f1 and f2 indicators of the activity. Activity indicator f1 is a dimensionless parameter which determines the natural content of radioactive isotopes in the sample.
f1 =∑Sij/ai = SK/3000 +SRa/300 +STh/200
SK, SRa, STh– isotope concentration expressed in Bq/kg in the test sample ai– parameters determined experimentally for different isotopes. F2 determines the radium isotope content in the sample.
The required values of the above-mentioned indicators in construction products are given in the Regulation of the Council of Ministers dated January 2, 2007:
in raw materials and construction materials used in buildings for the accommodation of people and livestock they cannot exceed more than 20% of the value:
f1=1; f2 =200Bq/kg maximum values: f1=1,2 , f2 =240 Bq/kg
The test results admit applying of the tested material as raw material for manufacturing of CRT glass tile, because the values f1 and f2 are lower than the maximum ones. Currently we are working on developing the glass tile's unit production technology parameters.
The physicochemical parameters of the glass tiles testing
The results of radioactivity testing of a glass cone and screen glass confirmed the possibility of the use of waste CRT glass as a raw material in the production of cladding materials. The physicochemical parameters of the glass tiles prepared on laboratory scale according to the developed technology are included in the table below.
The resulting parameters determine the application of CRT glass tiles as a material for indoor walls. Ongoing research include production of tiles on a semi-technical scale. The tiles are currently being tested for freeze resistance. The result of these studies will enable deciding on the possibility of their use as exterior cladding tiles.