Details
| Original language | English |
|---|---|
| Pages (from-to) | 132-145 |
| Number of pages | 14 |
| Journal | Journal of Material Cycles and Waste Management |
| Volume | 18 |
| Issue number | 1 |
| Publication status | Published - 1 Jan 2016 |
Abstract
Alkaline reactions of paper sludge combustion ash at low temperature (60 °C) were performed using a calcite-rich paper ash (PA 1) and a gehlenite-rich ash (PA 2). Strong alkaline conditions (8, 12, 16 M NaOH) were revealed at reaction times of 1–4 h and 12–24 h. Reactions were performed with pure ashes and in the presence of NaAlO2. The products were characterized by XRD, FTIR, SEM/EDX, gravimetry and chemical analysis. The conversion was found to proceed mainly in the period between 1 and 4 h. Portlandite and hydrogarnet were observed from PA 1 in 8 M NaOH. Onset of formation of Ca4Al2O6CO3.11H2O beside Ca(OH)2 could be analyzed after reaction of PA 1 in 12 M and 16 M NaOH. Addition of NaAlO2 favored crystallization of hydrogarnet and Ca4Al2O6CO3.11H2O. For PA 2 gehlenite remained stable, but a high portlandite fraction was observed. Addition of NaAlO2 yielded hydrogarnet beside gehlenite in 8 M NaOH. Higher alkalinities favored crystallization of Ca4Al2O6CO3.11H2O and onset of dissolution of gehlenite. Finally transformation of Ca4Al2O6CO3.11H2O into sodium aluminum silicate hydrate was observed. All results were discussed with regard to heavy metal distribution of the initial PA between the alkaline digestion solution and the products. In conclusion suitable applications of the products were proposed.
Keywords
- Alkaline digestion reaction, Katoite, Paper sludge combustion ash, Portlandite, Zeolite
ASJC Scopus subject areas
- Environmental Science(all)
- Waste Management and Disposal
- Engineering(all)
- Mechanics of Materials
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In: Journal of Material Cycles and Waste Management, Vol. 18, No. 1, 01.01.2016, p. 132-145.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Digestion reactions of paper sludge combustion ash in strong alkaline solutions at 60 °C
AU - Hartmann, Andrea
AU - Petrov, Valeriy
AU - Buhl, Josef Christian
AU - Rübner, K.
AU - Lindemann, M.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Alkaline reactions of paper sludge combustion ash at low temperature (60 °C) were performed using a calcite-rich paper ash (PA 1) and a gehlenite-rich ash (PA 2). Strong alkaline conditions (8, 12, 16 M NaOH) were revealed at reaction times of 1–4 h and 12–24 h. Reactions were performed with pure ashes and in the presence of NaAlO2. The products were characterized by XRD, FTIR, SEM/EDX, gravimetry and chemical analysis. The conversion was found to proceed mainly in the period between 1 and 4 h. Portlandite and hydrogarnet were observed from PA 1 in 8 M NaOH. Onset of formation of Ca4Al2O6CO3.11H2O beside Ca(OH)2 could be analyzed after reaction of PA 1 in 12 M and 16 M NaOH. Addition of NaAlO2 favored crystallization of hydrogarnet and Ca4Al2O6CO3.11H2O. For PA 2 gehlenite remained stable, but a high portlandite fraction was observed. Addition of NaAlO2 yielded hydrogarnet beside gehlenite in 8 M NaOH. Higher alkalinities favored crystallization of Ca4Al2O6CO3.11H2O and onset of dissolution of gehlenite. Finally transformation of Ca4Al2O6CO3.11H2O into sodium aluminum silicate hydrate was observed. All results were discussed with regard to heavy metal distribution of the initial PA between the alkaline digestion solution and the products. In conclusion suitable applications of the products were proposed.
AB - Alkaline reactions of paper sludge combustion ash at low temperature (60 °C) were performed using a calcite-rich paper ash (PA 1) and a gehlenite-rich ash (PA 2). Strong alkaline conditions (8, 12, 16 M NaOH) were revealed at reaction times of 1–4 h and 12–24 h. Reactions were performed with pure ashes and in the presence of NaAlO2. The products were characterized by XRD, FTIR, SEM/EDX, gravimetry and chemical analysis. The conversion was found to proceed mainly in the period between 1 and 4 h. Portlandite and hydrogarnet were observed from PA 1 in 8 M NaOH. Onset of formation of Ca4Al2O6CO3.11H2O beside Ca(OH)2 could be analyzed after reaction of PA 1 in 12 M and 16 M NaOH. Addition of NaAlO2 favored crystallization of hydrogarnet and Ca4Al2O6CO3.11H2O. For PA 2 gehlenite remained stable, but a high portlandite fraction was observed. Addition of NaAlO2 yielded hydrogarnet beside gehlenite in 8 M NaOH. Higher alkalinities favored crystallization of Ca4Al2O6CO3.11H2O and onset of dissolution of gehlenite. Finally transformation of Ca4Al2O6CO3.11H2O into sodium aluminum silicate hydrate was observed. All results were discussed with regard to heavy metal distribution of the initial PA between the alkaline digestion solution and the products. In conclusion suitable applications of the products were proposed.
KW - Alkaline digestion reaction
KW - Katoite
KW - Paper sludge combustion ash
KW - Portlandite
KW - Zeolite
UR - http://www.scopus.com/inward/record.url?scp=84908544173&partnerID=8YFLogxK
U2 - 10.1007/s10163-014-0320-4
DO - 10.1007/s10163-014-0320-4
M3 - Article
AN - SCOPUS:84908544173
VL - 18
SP - 132
EP - 145
JO - Journal of Material Cycles and Waste Management
JF - Journal of Material Cycles and Waste Management
SN - 1438-4957
IS - 1
ER -