Removal of Soluble Cr VI in Cements by Ferrous Sulphate monohydrate Solid Lignin and Other Materials
Yazarlar (4)
Emin Erdem Pamukkale Üniversitesi, Türkiye
Ramazan Donat Pamukkale Üniversitesi, Türkiye
Kadriye Esen Erden Pamukkale Üniversitesi, Türkiye
Doç. Dr. Turgay TUNÇ Kırşehir Ahi Evran Üniversitesi, Türkiye
| Makale Türü | Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale) | ||
| Dergi Adı | Ceramics-Silikaty | ||
| Dergi ISSN | 0862-5468 Wos Dergi Scopus Dergi | ||
| Dergi Tarandığı Indeksler | SCI-Expanded | ||
| Makale Dili | İngilizce | Basım Tarihi | 01-2011 |
| Kabul Tarihi | 12-04-2026 | Yayınlanma Tarihi | – |
| Cilt / Sayı / Sayfa | 55 / 55 / 85–95 | DOI | – |
| Özet |
| Various reducing agents such as ferrous sulphate heptahydrate (HH) and monohydrate (MH), solid lignin (SL), Na2S2O4, NaHSO3, SnCl2· 2H2O, N2H4· H2O and FeS are used to reduce Cr (VI) contents of three types of cements under 2 mg/L, as it is requested by European Parliament Standards. Optimum conversion temperature of HH to MH was found as 130 C, for 20 min., by thermal analysis. Minimum amounts of various agents to be used as additives in cements to reduce Cr (VI) contents under the standard value were determined. Minimum reducing agent amounts of SL, MH and their mixture of 1: 3 mole fractions were found as 0.44%, 0.14%, 0.24% by weight, respectively for Portland cement (CEM I 42.5 R), 0.40%, 0.26%, 0.24% for Portland Pozzolanic cement (CEM II/AP 42.5 N) and 0.16%, 0.05%, 0.04% for Pozzolanic cement (CEM IV/B (P) 32.5 N). Minimum amounts of other materials to reduce Cr (VI) content of three type cements under the required value, were found as 0.24%, 0.16%, 0.0 9%(N2H4· H2O), 0.10%, 0.07%, 0.04%(Na2S2O4), 0.04%, 0.025%, 0.01%(SnCl2· 2H2O) and 0.28%, 0.27%, 0.12%(NaHSO3), respectively. It was found that SL, the MH and their mixture of 1: 3 mole fractions can be used successfully as additives for reducing Cr (VI) contents of cement. There are two advantages of this usage of MH. It converts Cr (VI) to Cr (III) and extends the shelf-life of cement. On the other hand, SL reduces Cr (VI) and increases durability of cements by lowered water/cement ratio. |
| Anahtar Kelimeler |
| Calcined Ferrous sulphate heptahydrate | Cement | Chromium removal | Lignin |