Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 186, Issue 2-3, Pages 1954-1960Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.12.093
Keywords
Magnesium potassium phosphate cement; Nickel; Stabilization/solidification; Semi-dynamic leaching test
Categories
Funding
- Spanish Ministry of Science and Technology [REN2002-02971/TECNO]
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Herein is presented a study on the long-term leaching behaviour of nickel containing wastes stabilized/solidified with magnesium potassium phosphate cements. Two different semi-dynamic leaching tests were carried out on monolithic materials: ANS 16.1 test with liquid-to-solid ratio (L/S) of 10 dm(3) kg(-1) and increasing renewal times, and ASTM C1308 test with liquid-to-solid ratio (L/S) of 100 dm(3) kg(-1) and constant renewal time of 1 day. ASTM C1308 provides a lower degree of saturation of the leachant with respect to the leached material. The effectiveness of magnesium potassium phosphate cements for the inertization of nickel was proved. XRD analyses showed the presence of bobierrite on the monolith's surface after the leaching test, which had not been detected prior to the leaching test. In addition, the calculated cumulative release of the main components of the stabilization matrix (Mg2+, total P and K+) was represented versus time in logarithmic scale and it was determined if the leaching mechanism corresponds to diffusion. Potassium is released by diffusion, while total phosphorous and magnesium show dissolution. Magnesium release in ANS 16.1 is slowed down because of saturation of the leachant. Experimental results demonstrate the importance of US ratio and renewal times in semi-dynamic leaching tests. (C) 2010 Elsevier B.V. All rights reserved.
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