Effect of adsorbents on the leachability of cement bonded electroplating wastes

✍ Scribed by F.D. Tamás; L. Csetényi; J. Tritthart

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 323 KB
• Volume: 22
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(92)90082-7

✦ Synopsis

This study is aimed at the determination of pore solution composition of hardened cement pastes prepared with the addition of chromium-, cadmium-and nickel-salts. Due to the high pH-value of the pore water of cement paste, cadminm and nickel were transformed into insoluble hydroxides and precipitated practically quantitatively. Chromium, added as Na2Cr207.2 H20, which is soluble in a highly alkaline medium, was partly bound. It is not clear yet, whether chromium was adsorbed and/or incorporated in hydration products. The use of clinker instead of cement caused a more intensive bond. Adsorbents (silica fume, fly ash and activated carbon), with the exception of fly ash did not improve this bonding.