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. 2020 Feb 21:7:100837.
doi: 10.1016/j.mex.2020.100837. eCollection 2020.

Methods for identifying the material-recyclable share of SRF during co-processing in the cement industry

Alexia Aldrian  1 , Sandra A Viczek  1 , Roland Pomberger  1 , Renato Sarc  1
Affiliations

Methods for identifying the material-recyclable share of SRF during co-processing in the cement industry

Alexia Aldrian et al. MethodsX. .

Abstract

Solid Recovered Fuels (SRF) include non-combustible mineral components (e.g. CaCO3, SiO2, Al2O3) that are required as raw materials for producing clinker and are completely incorporated into the clinker during the thermal recovery of SRF. This paper discusses simple and practicable ways of finding the relative amount of SRF that may be utilised as raw material (given as the recycling index). For this purpose, the entire mineral content of SRF was determined as the ash content and its main components were identified using different analytical methods.•A fusion melt of the previously incinerated sample with subsequent measuring using ICP-OES and XRF as well as a total digestion of the incinerated and non-incinerated sample with subsequent measuring using ICP-OES/ICP-MS were applied.•The results showed a good agreement of all four analytical methods for the elementary oxides Al2O3, CaO, Fe2O3, SiO2, TiO2, P2O5 and MgO (relative deviation from 6.6 to 38.9%) and slightly higher deviations for K2O, Na2O and SO3 (14.2-96.0%).•It was also shown that different incineration temperatures (550 °C, 815 °C and 950 °C) have no effect on the result of the recycling index unless it is assumed that the recycling index equals the ash content.

Keywords: Ash content; Cement industry; Main components; Methods; Mineral matter; Recycling; Solid recovered fuel.

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Figures

Image, graphical abstract
Graphical abstract
Fig. 1
Fig. 1
Overview on the different analytical approaches for the determination of the R-Index.
Fig. 2
Fig. 2
Comparison of the R-Indices for randomly selected SRF samples at different incineration temperatures; including all measured elementary oxides (above) as well as selected elementary oxides Al2O3, CaO, Fe2O3, SiO2 (below).
Fig. A1
Fig. A1
Results for Al2O3, CaO and Fe2O3 and for all analytical methods for randomly selected samples.
Fig. A2
Fig. A2
Results for K2O MgO, Na2O and P2O5 and for all analytical methods for randomly selected samples.
Fig. A3
Fig. A3
Results for SO3, SiO2, TiO2 and the sum of all measured oxides for all analytical methods for randomly selected samples.
See this image and copyright information in PMC

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